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Migliano, Pedro, Laura S. Kabiri, Megan Cross, Allison Butcher, Amy Frugé, Wayne Brewer, and Alexis Ortiz. "Validation of Cardiorespiratory Fitness Measurements in Adolescents." Journal of Functional Morphology and Kinesiology 4, no. 3 (July 13, 2019): 44. http://dx.doi.org/10.3390/jfmk4030044.
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Cardiorespiratory fitness (CRF) is an important indicator of adolescent cardiovascular well-being and future cardiometabolic health but not always feasible to measure. The purpose of this study was to estimate the concurrent validity of the non-exercise test (NET) for adolescents against the Progressive Aerobic Capacity Endurance Run (PACER®) and direct measures of VO2max as well as to examine the concurrent validity of the PACER® with a portable metabolic system (K4b2™). Forty-six adolescents (12–17 years) completed the NET prior to performing the PACER® while wearing the K4b2™. The obtained VO2max values were compared using linear regression, intra-class correlation (ICC), and Bland–Altman plots, and α was set at 0.05. The VO2max acquired directly from the K4b2™ was significantly correlated to the VO2max indirectly estimated from the NET (r = 0.73, p < 0.001, r2 = 0.53, ICC = 0.67). PACER® results were significantly related to the VO2max estimates from the NET (r = 0.81, p < 0.001, r2 = 0.65, ICC = 0.72). Direct measures from the K4b2™ were significantly correlated to the VO2max estimates from the PACER® (r = 0.87, p < 0.001, r2 = 0.75, ICC = 0.93). The NET is a valid measure of CRF in adolescents and can be used when an exercise test is not feasible.
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Laye, M. J., M. B. Nielsen, L. S. Hansen, T. Knudsen, and B. K. Pedersen. "Physical Activity Enhances Metabolic Fitness Independently of Cardiorespiratory Fitness in Marathon Runners." Disease Markers 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/806418.
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High levels of cardiovascular fitness (CRF) and physical activity (PA) are associated with decreased mortality and risk to develop metabolic diseases. The independent contributions of CRF and PA to metabolic disease risk factors are unknown. We tested the hypothesis that runners who run consistently >50 km/wk and/or >2 marathons/yr for the last 5 years have superior metabolic fitness compared to matched sedentary subjects (CRF, age, gender, and BMI). Case-control recruitment of 31 pairs of runner-sedentary subjects identified 10 matched pairs with similar VO2max(mL/min/kg) (similar-VO2max). The similar-VO2maxgroup was compared with a group of age, gender, and BMI matched pairs who had the largest difference in VO2max(different-VO2max). Primary outcomes that defined metabolic fitness including insulin response to an oral glucose tolerance test, fasting lipids, and fasting insulin were superior in runners versus sedentary controls despite similar VO2max. Furthermore, performance (velocity at VO2max, running economy), improved exercise metabolism (lactate threshold), and skeletal muscle levels of mitochondrial proteins were superior in runners versus sedentary controls with similar VO2max. In conclusion subjects with a high amount of PA have more positive metabolic health parameters independent of CRF. PA is thus a good marker against metabolic diseases.
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Smouter, Leandro, André de Camargo Smolarek, William Cordeiro de Souza, Valderi de Abreu de Lima, and Luis Paulo Gomes Mascarenhas. "CARDIORESPIRATORY FITNESS ASSOCIATED TO TEENAGERS’ FAT: VO2MAX CUTOFF POINT." Revista Paulista de Pediatria 37, no. 1 (January 2019): 73–81. http://dx.doi.org/10.1590/1984-0462/;2019;37;1;00017.
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ABSTRACT Objective: To associate the Maximal Oxygen Uptake (VO2max) with body fat percentage (%BF), and to establish the best VO2max cutoff point for predicting risk %BF in teenagers. Methods: This study was carried out with 979 subjects aged 10 to 18.8 years, 556 (56.8%) girls. The 20 m shuttle run protocol determined the VO2max, which was analyzed in quintiles and in a numeric scale. Cutaneous fold equations determined the %BF, later classified as risk to health/obesity when >25 in girls and >20 in boys. Regression method was used - Odds Ratio (OR) and Receiver Operating Characteristics Curve (ROC curve) with α <5%. Results: From the total number of valid cases, 341 (65.6%) girls and 202 (53.2%) boys presented %BF of risk, and a larger proportion of %BF of risk was observed in the 1st quintile of the VO2max for both genders. There was inverse association between VO2max and %BF of risk from the 4th quintile (OR 1.84, 95%CI 1.05-3.24) until the 1st quintile (OR 4.74, 95%CI 2.44-9.19) for girls, and from the 2nd quintile (OR 2.99, 95%CI 1.48-6.00) until the 1st quintile (OR 5.60, 95%CI 2.64-11.87) for boys. As analytic highlights, VO2max Cutoff points for prediction of %BF of risk were ≤40.9 mL/kg-1/min-1 (AUC: 0.65; p<0.001) for girls and ≤44.8 mL/kg-1/min-1 (AUC: 0.66; p<0.001)for boys.. Conclusions: VO2max was inversely associated to the %BF, and VO2max cutoff points for prediction of %BF of risk are important results to generate action to fight early obesity.
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Sørensen, Kasper, Mathias Krogh Poulsen, Dan Stieper Karbing, Peter Søgaard, Johannes Jan Struijk, and Samuel Emil Schmidt. "A Clinical Method for Estimation of VO2max Using Seismocardiography." International Journal of Sports Medicine 41, no. 10 (May 26, 2020): 661–68. http://dx.doi.org/10.1055/a-1144-3369.
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AbstractThe purpose of this study was to investigate the correlation between the seismocardiogram and cardiorespiratory fitness. Cardiorespiratory fitness can be estimated as VO2max using non-exercise algorithms, but the results can be inaccurate. Healthy subjects were recruited for this study. Seismocardiogram and electrocardiogram were recorded at rest. VO2max was measured during a maximal effort cycle ergometer test. Amplitudes and timing intervals were extracted from the seismocardiogram and used in combination with demographic data in a non-exercise prediction model for VO2max. 26 subjects were included, 17 females. Mean age: 38.3±9.1 years. The amplitude following the aortic valve closure derived from the seismocardiogram had a significant correlation of 0.80 (p<0.001) to VO2max. This feature combined with age, sex and BMI in the prediction model, yields a correlation to VO2max of 0.90 (p<0.001, 95% CI: 0.83–0.94) and a standard error of the estimate of 3.21 mL·kg−1·min−1 . The seismocardiogram carries information about the cardiorespiratory fitness. When comparing to other non-exercise models the proposed model performs better, even after cross validation. The model is limited when tracking changes in VO2max. The method could be used in the clinic for a more accurate estimation of VO2max compared to current non-exercise methods.
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Coledam, Diogo Henrique Constantino, Philippe Fanelli Ferraiol, and Arli Ramos de Oliveira. "Higher cardiorespiratory and muscular fitness in males could not be attributed to physical activity, sports practice or sedentary behavior in young people." Brazilian Journal of Kinanthropometry and Human Performance 20, no. 1 (March 14, 2018): 43–52. http://dx.doi.org/10.5007/1980-0037.2018v20n1p43.
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The purpose of the present study was to analyze if the association between sex with cardiorespiratory and muscular fitness is independent of physical activity, sports practice and sedentary behavior in young people. A cross-sectional study involving 729 participants aged 10 to 17 years. Physical activity, sports practice and sedentary behavior were assessed through a questionnaire. Cardiorespiratory fitness was measured using 20m shuttle run test and were analyzed: VO2max, number of laps and health-related criteria. Muscular fitness was assessed with 90o push-up test and number of repetition and health-related criteria was analyzed. Multiple linear regression was used to estimate β coeficients and Poisson regression estimated prevalence ratios (PR). Male sex was associated to higher cardiorespiratory fitness (VO2max β = 9.04 to 9.77, Laps PR=1.67 to 1.80, health-related criteria PR=2.03 to 2.09) and the same occurred with muscular fitness (repetitions PR=2.81 to 3.01, health-related criteria PR=1.91 to 2.09). Similarly, the stratification of the sample according to physical activity, sports practice and sedentary behavior did not change the associations between sex with cardiorespiratory (VO2max β=8.07 to 10.00, Laps PR=1.49 to 1.85, health-related criteria PR=1.64 to 2.27) and muscular fitness (repetitions PR=2.24 to 3.22, health-related criteria PR=1.76 to 2.06). These data suggest that higher cardiorespiratory and muscular fitness in males could not be attributed to physical activity, sports practice or sedentary behavior in young people.
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Kind, Sara, Stefanie Brighenti-Zogg, Jonas Mundwiler, Ulla Schüpbach, Jörg D. Leuppi, David Miedinger, and Thomas Dieterle. "Factors Associated with Cardiorespiratory Fitness in a Swiss Working Population." Journal of Sports Medicine 2019 (July 2, 2019): 1–8. http://dx.doi.org/10.1155/2019/5317961.
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Background. Good cardiorespiratory fitness (high VO2max) has beneficial effects on morbidity and mortality. Therefore, a tool to estimate VO2max in daily clinical practice is of great value for preventing chronic diseases in healthy adults. This study aimed at exploring the cardiometabolic profile in a representative Swiss working population. Based on these insights, a regression model was derived revealing factors associated with VO2max. Methods. Cross-sectional data of 337 healthy and full-time employed adults recruited in the Basel region, Switzerland, were collected. Anthropometric measurements to compute body mass index (BMI) and waist circumference (WC) were performed. A 20-meter shuttle run test was conducted to determine individual VO2max. Heart rate (HR) was measured at rest, during maximal exertion, and two minutes after exercise. Systolic (SBP) and diastolic blood pressure (DBP) were assessed at rest and after exercise. A multiple linear regression model was built to identify a set of nonexercise predictor variables of VO2max. Results. Complete data of 303 individuals (63% male) aged 18 to 61 years (mean 33 ± 12 years) were considered for analysis. The regression model (adjusted R2 = 0.647, SE = 5.3) identified sex (β = -0.699, p < 0.001), WC (β = -0.403, p < 0.001), difference of maximal to resting HR (β = 0.234, p < 0.001), smoking (β = -0.171, p < 0.001), and age (β = -0.131, p < 0.01) as the most important factors associated with VO2max, while BMI, SBP, and DBP did not contribute to the regression model. Conclusions. This study introduced a simple model to evaluate VO2max based on nonexercise parameters as part of daily clinical routine without needing a time-consuming, cost-intense, and physically demanding direct assessment of VO2max. Knowledge about VO2max may help identifying individuals at increased cardiovascular risk and may provide the basis for health counselling and tailoring preventive measures.
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Howe, Anna S., Paula ML Skidmore, Winsome R. Parnell, Jyh Eiin Wong, Alexandra C. Lubransky, and Katherine E. Black. "Cardiorespiratory fitness is positively associated with a healthy dietary pattern in New Zealand adolescents." Public Health Nutrition 19, no. 7 (September 8, 2015): 1279–87. http://dx.doi.org/10.1017/s1368980015002566.
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AbstractObjectiveTo examine the association between cardiorespiratory fitness and dietary patterns in adolescents.DesignFood choice was assessed using the validated New Zealand Adolescent FFQ. Principal components analysis was used to determine dietary patterns. Trained research assistants measured participants’ height and body mass. Cardiorespiratory fitness was assessed in a subset of participants using the multistage 20 m shuttle run. The level and stage were recorded, and the corresponding VO2max was calculated. Differences in mean VO2max according to sex and BMI were assessed using t tests, while associations between cardiorespiratory fitness and dietary patterns were examined using linear regression analyses adjusted for age, sex, school attended, socio-economic deprivation and BMI.SettingSecondary schools in Otago, New Zealand.SubjectsStudents (n 279) aged 14–18 years who completed an online lifestyle survey during a class period.ResultsPrincipal components analysis produced three dietary patterns: ‘Treat Foods’, ‘Fruits and Vegetables’ and ‘Basic Foods’. The 279 participants who provided questionnaire data and completed cardiorespiratory fitness testing had a mean age of 15·7 (sd 0·9) years. Mean VO2max was 45·8 (sd 6·9) ml/kg per min. The ‘Fruits and Vegetables’ pattern was positively associated with VO2max in the total sample (β=0·04; 95 %CI 0·02, 0·07), girls (β=0·06; 95 % CI 0·03, 0·10) and boys (β=0·03; 95 % CI 0·01, 0·05).ConclusionsThese results indicate that increase in cardiorespiratory fitness was associated with a healthier dietary pattern, suggesting both should be targeted as part of a global lifestyle approach. Longitudinal studies are needed to confirm this association in relation to health outcomes in New Zealand adolescents.
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Yang, Xiaofang, Xiaojian Yin, Liu Ji, Ge Song, Huipan Wu, Yuqiang Li, Guodong Wang, et al. "Differences in Cardiorespiratory Fitness between Chinese and Japanese Children and Adolescents." International Journal of Environmental Research and Public Health 16, no. 13 (June 30, 2019): 2316. http://dx.doi.org/10.3390/ijerph16132316.
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Background: This study aimed to compare the difference in cardiorespiratory fitness between Chinese and Japanese children and adolescents. Methods: Participants comprised 9025 children and adolescents aged 7–18 years from China and Japan. Cardiorespiratory fitness (CRF) was measured by performance in the 20 m shuttle run test (20mSRT) and estimated maximal oxygen consumption (VO2max). Differences in CRF between countries were evaluated by t-tests. Centile curves for the 20mSRT and VO2max values were constructed for Chinese and Japanese children and adolescents, respectively, using the Lambda Mu and Sigma (LMS) method. Results: (1) For most of the age groups, the 20mSRT and VO2max performances among Chinese participants were lower than among Japanese participants. (2) Japanese children had the most apparent gains in P10, P50, and P90 VO2max values in primary school; however, they gradually decreased in middle school. For Chinese girls, the P10, P50, and P90 VO2max values decreased gradually with age. (3) The VO2max value among Japanese children increased; however, it decreased or remained flat among Chinese children in primary school. Conclusions: CRF among Chinese participants was lower than among Japanese participants while the VO2max value showed different trends in primary school. Effective measures should be taken to improve CRF among children and adolescents.
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Hageman, Patricia A., Susan Noble Walker, Carol H. Pullen, Linda S. Boeckner, and Maureen K. Oberdorfer. "Physical Activity and Fitness among Midlife and Older Rural Women." Journal of Aging and Physical Activity 13, no. 3 (July 2005): 327–42. http://dx.doi.org/10.1123/japa.13.3.327.
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This study investigated physical activity and fitness of midlife and older rural women. Random-digit dialing was used to recruit 225 women (57.9 ± 5.6 years old). Self-reported activity (moderate activity, flexibility, and strength) and fitness (body composition, flexibility, strength, and estimated VO2max) were assessed. The women demonstrated low daily energy expenditure (30.74 ± 10.63 kcal · kg−1· day−1) and estimated VO2max(20.12 ± 7.81 ml · kg−1· min−1), with 51.5% reporting fair or poor health. Few women reported meeting Healthy People 2010 targets for moderate activity (43.1%), flexibility (28.9%), or strength (14.2%). When classified by estimated VO2maxinto three categories, differences were observed for body-mass index, percent body fat, sit and reach, and timed chair stands, with the poorest performance by those with low cardiorespiratory fitness. Adherence to Healthy People 2010 targets for moderate activity and strengthening was associated with higher cardiorespiratory fitness. These rural women are targets for physical activity interventions because of their sedentary behaviors and low cardiorespiratory fitness.
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Oliveira, Raphael Gonçalves de, and Dartagnan Pinto Guedes. "PHYSICAL ACTIVITY, CARDIORESPIRATORY FITNESS AND METABOLIC SYNDROME IN ADOLESCENTS." Revista Brasileira de Medicina do Esporte 24, no. 4 (August 2018): 253–57. http://dx.doi.org/10.1590/1517-869220182404174502.
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ABSTRACT Introduction: Metabolic Syndrome (MetS) has been associated with sedentary behavior, low levels of physical activity and of cardiorespiratory fitness. However, in adolescents the results are conflicting. Objective: To measure the association between sedentary behavior, physical activity, cardiorespiratory fitness and MetS in a representative sample of adolescents. Methods: The sample consisted of 1,035 adolescents (565 girls and 470 boys) between 12 and 20 years of age. Sedentary behavior was treated through recreational screen time, while information equivalent to physical activity was considered through the Physical Activity Questionnaire for Adolescents. The maximal oxygen uptake (VO2max), estimated through PACER performance, was used as an indicator of cardiorespiratory fitness. MetS was identified using the criteria of the International Diabetes Federation. Results: Adolescents of both sexes identified with MetS had significantly longer recreational screen time and lower VO2max than their unidentified MetS peers. Scores equivalent to the level of physical activity undertaken by adolescents identified and not identified with MetS were statistically similar. Probabilistically, adolescents with high recreational screen time and low VO2max had, respectively, 79% [OR = 1.79; 95% CI 1.10 – 2.82] and 95% [OR = 1.95; 95% CI 1.20 – 3.09] greater odds of being identified with MetS. Conclusion: The findings indicate consistent and significant associations between longer recreational screen time, low VO2max values and high prevalence of MetS, which suggests specific interventions designed to help minimize cardiometabolic risk exposure from a very early age. Level of Evidence III; Prognostic Studies - Investigating the Effect of a Patient's Characteristics on the Disease Outcome.
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Khanna, Archana, Ankita Singh, Bhanu Pratap Singh, and Faiz Khan. "Cardiorespiratory Fitness in University Level Volleyball Players and its Correlation with Body Fat." Polish Journal of Sport and Tourism 27, no. 3 (September 1, 2020): 15–19. http://dx.doi.org/10.2478/pjst-2020-0015.
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Abstract Introduction. The present study was aimed to compare the cardiorespiratory fitness levels (VO2max) between university level male and female volleyball players and to find its correlation with percentage body fat. Material and Methods. In the present cross-sectional study, male and female volleyball players (n = 15 each) aged 18-25 years were randomly selected from Teerthanker Mahaveer University, Moradabad, India. An equal number of sedentary individuals were also selected who did not indulge in any vigorous physical activity or training. Body height, body weight, body mass index (BMI), % lean body mass of players and sedentary individuals were recorded using standard methods. Percentage body fat was calculated using the sum of four skinfolds and VO2max was recorded using Queen’s college step test. Data were analysed using SPSS software version 20.0. Unpaired t-test was used for comparison between players and sedentary individuals and two-way ANOVA was used to examine interaction of status (active players and sedentary individuals) and gender on VO2max. Results. Players had higher mean values for % lean body mass and VO2max. Statistically, highly significant differences (p < 0.05) were observed between male and female players for all variables except BMI. Players had better cardiorespiratory fitness (VO2max) as compared to their sedentary counterparts. Conclusions. Significant differences exist between players and sedentary individuals for percentage body fat and percentage lean body mass. Cardiorespiratory fitness of players is negatively correlated with percentage body fat. Players have higher VO2max as compared to their sedentary counterparts.
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Queiroga, Marcos Roberto, Ricardo Augusto Barbieri, Sandra Aires Ferreira, André Ducati Luchessi, Rosario Dominguez Crespo Hirata, Mario Hiroyuki Hirata, and Eduardo Kokubun. "Influence of Cardiorespiratory Fitness onPPARGmRNA Expression Using Monozygotic Twin Case Control." Journal of Diabetes Research 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/538732.
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The influence of cardiorespiratory fitness (VO2max) on anthropometric variables andPPARGmRNA expression was investigated. Monozygotic twin pairs aged 11–18 years were grouped into discordant (D) and concordant (C) high and low VO2max groups. VO2max was determined by progressive maximal exercise test on treadmill with gas exchange analysis. Body mass (BM), BMI, waist circumference (WC), triceps (TR), and subscapular (SB) skinfold thicknesses were measured. Twins from the discordant group had differences in VO2max values (D-high =45.9±10.0versus D-low =32.4±10.6 mL·kg−1·min−1,P=0.025), while no differences were found in the concordant group (C-high =42.4±9.2versus C-low =38.8±9.8 mL·kg−1·min−1,P=0.952). In discordant group, VO2max was negatively correlated with TR + SB (r=-0.540,P=0.021) and positively correlated withPPARGexpression in leukocytes (r=0.952,P=0.001). Moreover,PPARGexpression was directly correlated with BM (r=0.714,P=0.047) and height (r=0.762,P=0.028). In concordant twins, VO2max was inversely correlated with BM (r=-0.290,P=0.027), BMI (r=-0.472,P=0.001), WC (r=-0.426,P=0.001), and TR + SB (r=-0.739,P=0.001). Twins D-high had 1.78-fold greaterPPARGexpression when compared with twins D-low (P=0.048). In conclusion, the cardiorespiratory fitness may modulatePPARGexpression in childhood and adolescence, independently of the genetic background.
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Patel, Urvi Vipul, and G. D. Vishnu Vardhan. "Effect of aerobic training on cardiorespiratory fitness using chester treadmill walk test in physiotherapy students." International Journal of Physiotherapy and Research 9, no. 1 (January 11, 2021): 3736–42. http://dx.doi.org/10.16965/ijpr.2020.184.
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Background: The aim of the study was to study the effect of aerobic training on cardiorespiratory fitness in physiotherapy students. This was an analytical type of study in which the participants were tested both pre and post the intervention to carry out the results accordingly. Context and Purpose of the study: Physiotherapist as trainers of fitness are themselves expected to have a good amount of fitness. There are many studies done on evaluation of cardiorespiratory fitness in physiotherapy students. There is limited literature to check the effect of aerobic training using Chester Treadmill Walk Test specifically on cardiorespiratory fitness in physiotherapy students. 25 Participants were selected by Convenient Sampling who were Physiotherapy students. The participants included were between age group of 18-25 years who were not able to complete the Chester Treadmill Walk test for 12 minutes. After which those who were included were given a 8 weeks treadmill training intervention and post the testing was conclusion was carried out accordingly. Results: The student paired “t” test value of heartrate prior to intervention was 33.81 and post intervention was 8.34 and the student paired “t” test value for systolic blood pressure was 2.16 and diastolic blood pressure was 2.22. The student paired “t” test value of VO2max was 4.03. Based on the readings of the “t” test values mentioned above, proves that there is significant increase in VO2max post the aerobic training intervention Conclusion: The result shows that there is a significant increase in VO2max which was calculated using the formula for Chester Treadmill Walk Test after the aerobic training intervention was given for 8 weeks based on the ACSM’s Guidelines. KEY WORDS: Chester Treadmill Walk Test, Cardiorespiratory fitness, Treadmill training, Physiotherapy students.
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Patel, Urvi Vipul, and G. D. Vishnu Vardhan. "Effect of aerobic training on cardiorespiratory fitness using chester treadmill walk test in physiotherapy students." International Journal of Physiotherapy and Research 9, no. 1 (January 11, 2021): 3736–42. http://dx.doi.org/10.16965/ijpr.2020.184.
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Background: The aim of the study was to study the effect of aerobic training on cardiorespiratory fitness in physiotherapy students. This was an analytical type of study in which the participants were tested both pre and post the intervention to carry out the results accordingly. Context and Purpose of the study: Physiotherapist as trainers of fitness are themselves expected to have a good amount of fitness. There are many studies done on evaluation of cardiorespiratory fitness in physiotherapy students. There is limited literature to check the effect of aerobic training using Chester Treadmill Walk Test specifically on cardiorespiratory fitness in physiotherapy students. 25 Participants were selected by Convenient Sampling who were Physiotherapy students. The participants included were between age group of 18-25 years who were not able to complete the Chester Treadmill Walk test for 12 minutes. After which those who were included were given a 8 weeks treadmill training intervention and post the testing was conclusion was carried out accordingly. Results: The student paired “t” test value of heartrate prior to intervention was 33.81 and post intervention was 8.34 and the student paired “t” test value for systolic blood pressure was 2.16 and diastolic blood pressure was 2.22. The student paired “t” test value of VO2max was 4.03. Based on the readings of the “t” test values mentioned above, proves that there is significant increase in VO2max post the aerobic training intervention Conclusion: The result shows that there is a significant increase in VO2max which was calculated using the formula for Chester Treadmill Walk Test after the aerobic training intervention was given for 8 weeks based on the ACSM’s Guidelines. KEY WORDS: Chester Treadmill Walk Test, Cardiorespiratory fitness, Treadmill training, Physiotherapy students.
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Gultom, Chandrawati, Irma Ruslina Defi, and Ellyana Sungkar. "Association between Self Reported Questionnaire-determined Physical Activity Level with the Cardiorespiratory Fitness in Adolescent." Indonesian Journal of Physical Medicine & Rehabilitation 8, no. 01 (January 28, 2020): 2–8. http://dx.doi.org/10.36803/ijpmr.v8i01.178.
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Introduction: Cardiorespiratory fitness (CRF) and physical activity (PA) in childhood can reduce the risk of cardiovascular diseases in adults. Further analysis related to the relationship between PA and CRFto prevent an inactive lifestyle is neededMethods: An analytic cross-sectional design in adolescents aged 13-15 years old, who had no cardiovascular and metabolic diseases, with light or medium physical activity, no deformity in thelower limbs and posture disorders. Cardiorespiratory fitness was assessed by the indirect method Bruce Protocol in the Faculty of Sport and Health Education’s library, The University of Pendidikan Indonesiaon September-October 2019. Physical activity was measure by the Physical Activity Questionnaire for Adolescent (PAQ-A).Results: Subjects consisted of 82 adolescents (41 boys, 41 girls), aged 13-15 years old with the Body mass index (BMI) was 18.5-29 kg/m2. The mean value of predicted VO2max (Bruce) for boys and girlswere 46.66 ± 8.765 and 40.06 ± 6.210 ml/kg2, while the value of predicted PAQ-A score for boys and girls were 2.54±0.756 and 2.16±0.416. The correlation between PAQ-A and VO2max in boys and girlswere r=0,190, p=0,234 and r=0.420; p=0.006.Conclusion: There was a moderate association between PAQ-A with VO2max in girls.Keywords: Cardiorespiratory fitness, Physical activity questionnaire, VO2max.
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Couldwell, William T. "Cardiorespiratory fitness and the progression of carotid atherosclerosis in middle-aged men. Ann Intern Med 134:12–20, 2001." Neurosurgical Focus 10, no. 2 (February 2001): 1. http://dx.doi.org/10.3171/foc.2001.10.2.7.
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Background Good cardiorespiratory fitness has been associated with reduced risk for clinical events of atherosclerotic vascular diseases, but whether it is related to slower progression of early atherosclerosis is unclear. Objective: To study the association between cardiorespiratory fitness and the progression of early carotid atherosclerosis. Design: 4-year follow-up study. Setting: Eastern Finland. Participants: Population-based sample of 854 men 42 to 60 years of age. Measurements: Maximal oxygen uptake (VO2max [L/kg per minute]) was measured directly by using respiratory gas exchange in a cycle ergometer exercise test. Carotid atherosclerosis was assessed by using B-mode ultrasonography. Results: After adjustments for age, technical covariates, and cigarette smoking, VO2max had strong, inverse, and graded associations with 4-year increases i maximal intima-media thickness (IMT) (standard regression coefficient β = 0.120; P = 0.002); plaque height (β = 0.140; P < 0.001), surface roughness, and mean IMT (β = 0.080; P = 0.035). These associations weakened but remained statistically significant after additional adjustment for systole blood pressure, serum levels of apolipoprotein B, diabetes, and plasma fibrinogen levels. The increases in maximal IMT, surface roughness, and mean 26.1 mL/kg per IMT (23%, 32% and 100%, respectively) were larger among men in the lowest quartile of VO2max (< minute) than among those in the highest quartile (> 36.2 ML/kg per minute). Conclusions: Good cardiorespiratory fitness is associated with slower progression of early atherosclerosis in middle-aged men. These findings are important because they emphasize that middle-aged men can be evaluated for cardiorespiratory fitness to estimate their future risk for atherosclerotic vascular disease. Additional research is warranted to investigate a possible causal relationship between cardiorespiratory fitness and atherosclerosis.
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Windiastoni, Yoga Handita, and Nurul Fithriati Haritsah. "Pengaruh High Intensity Interval Training Terhadap Cardiorespiratory Pada Remaja." Interest : Jurnal Ilmu Kesehatan 8, no. 2 (November 27, 2019): 169–76. http://dx.doi.org/10.37341/interest.v8i2.172.
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Background: Cardiorespiratory fitness in adolescence affects the level of fitness and determinants of health levels in old age. School adolescents who have low physical activity need easy, efficient and effective physical training to increase cardiorespiratry fitness, namely high intensity interval training. Objective: to determine the effect of high intensity interval training on cardiorespitatory fitness training in adolescents. Subjects: 60 high school students (men n = 21, women n = 39) aged 15-19 years who met the study criteria and were divided into 2 groups, a high intensity interval training group and a control group by jogging. Method: quasi experimental with pre-test and post-test one group design with control group. The instrument used in this study was a 20m shuttle run test. Analysis: normality test with Kolmogorov-Smirnov, then parametric test with paired sample t-test and parametric difference test with independent sample t-test. Results: VO2max pre-test and post-test high intensity interval training group obtained p value = 0,000 (p <0.05) which showed there were significant differences before and after treatment. The results of the post-test different test between the control and treatment groups showed that the value of p = 0,000 (p <0.05) showed that there was a significant difference between the high intensity interval training group and the control group and the results of the different mean mean were greater in the high intensity interval training group. after and before treatment. Conclusion: high intensity interval training can increase cardiorespiratory fitness in adolescents according to the results of VO2max values.
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Ogonowska-Slodownik, Anna, Paula Richley Geigle, and Natalia Morgulec-Adamowicz. "Head-Out Water-Based Protocols to Assess Cardiorespiratory Fitness—Systematic Review." International Journal of Environmental Research and Public Health 17, no. 19 (October 2, 2020): 7215. http://dx.doi.org/10.3390/ijerph17197215.
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The aquatic environment offers cardiorespiratory training and testing options particularly for individuals unable to adequately train or test on land because of weight bearing, pain or disability concerns. No systematic review exists describing cardiorespiratory fitness protocols used in an aquatic environment. This review investigated the different head-out water-based protocols used to assess cardiorespiratory fitness. Our comprehensive, systematic review included 41 studies with each included paper methodological quality assessed using the statistical review of general papers checklist. Diverse protocols arose with three major categories identified: conducted in shallow water, deep water, and using special equipment. Thirty-seven articles presented data for peak/maximal oxygen consumption (VO2peak/VO2max). Twenty-eight of 37 studies predefined criteria for reaching a valid VO2peak/VO2max with shallow water exercise demonstrating 20.6 to 57.2 mL/kg/min; deep water running 20.32 to 48.4 mL/kg/min; and underwater treadmill and cycling 28.64 to 62.2 mL/kg/min. No single, accepted head-out water-based protocol for evaluating cardiorespiratory fitness arose. For clinical use three cardiorespiratory fitness testing concepts ensued: water temperature of 28–30 °C with difference of maximum 1 °C between testing participants and/or testing sessions; water depth adapted for participant aquatic experiences and abilities; and intensity increment of 10–15 metronome beats per minute.
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Villalba-Heredia, Lorena, Cristina Comeras-Chueca, Alejandro González-Agüero, Daniel Domingo-del-Val, Pilar Calmarza, Germán Vicente-Rodríguez, José A. Casajús, and Ángel Matute-Llorente. "25-Hydroxyvitamin D and Cardiorespiratory Fitness in Prepubertal Overweight and Obese Children." Nutrients 13, no. 5 (May 11, 2021): 1597. http://dx.doi.org/10.3390/nu13051597.
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Childhood obesity has become a major global health problem. Vitamin D deficiency and poor cardiorespiratory fitness are highly prevalent in children with overweight or obesity, but little is known about their relationships. In this study, we aimed to analyze the relationship between serum 25-hydroxyvitamin D (25(OH)D) and cardiorespiratory fitness parameters in prepubertal obese and overweight children. A cross-sectional design with a sample of 57 prepubertal children, aged 9–11 years, with overweight or obesity was used. The fasting concentration of 25(OH)D was analyzed with a chemiluminescent microparticle immunoassay. Fat and lean body masses were determined by using DXA. Maximal oxygen uptake (VO2max) was measured with the maximal treadmill test. A total of 68.4% of the sample had sufficient levels of 25(OH)D. As expected, their cardiorespiratory fitness was poor compared with that of normal-weight children, but 60% of the group exceeded the median obesity-specific reference values. No differences were found between the sexes for relative VO2max or 25(OH)D levels. Moreover, no correlations were found between 25(OH)D and body composition or cardiorespiratory parameters for sex or vitamin D groups. Vitamin D status seems not to be directly related to body composition or cardiorespiratory fitness in prepubertal overweight or obese children.
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Chilibeck, Philip D., Donald H. Paterson, Robert J. Petrella, and David A. Cunningham. "The Influence of Age and Cardiorespiratory Fitness on Kinetics of Oxygen Uptake." Canadian Journal of Applied Physiology 21, no. 3 (June 1, 1996): 185–96. http://dx.doi.org/10.1139/h96-015.
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The purpose of this study was to determine the influences of ageing and cardiorespiratory fitness on kinetics of VO2 during the transition to exercise of moderate intensity. Subjects performed three transitions to and from a 6-minute square wave constant load, at an intensity corresponding to 90% of ventilatory threshold (VET), to determine VO2 kinetics. The young group had a significantly faster time constant of VO2 (τVO2). τVO2 was significantly correlated with VO2max for both young and old groups; however, the slope of the τVO2 - VO2max regression equation was steeper for the old group, indicating that fit older subjects had VO2 kinetics that approached those of fit young. A multiple linear regression indicated that relative fitness was the strongest significant predictor of τVO2, followed by sex and age. Although VO2 kinetics are definitely slowed with age, relative levels of cardiorespiratory fitness also have a great influence on the dynamic response of VO2. Key words: VO2max, ventilatory threshold, heart rate kinetics
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Lajoso-Silva, Nuno, Pedro Bezerra, Bruno Silva, and José Maria Cancela Carral. "Firefighters Cardiorespiratory Fitness Parameters after 24 Weeks of Functional Training with and without Personal Protective Equipment." Polish Journal of Sport and Tourism 28, no. 2 (June 1, 2021): 8–13. http://dx.doi.org/10.2478/pjst-2021-0008.
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Abstract Introduction Firefighters’ (FFs) cardiorespiratory fitness is considered an important capacity for workability. To successfully complete safety standards and rescue protocols, FFs are required to accomplish minimum values of relative VO2max. Physical fitness programs for FFs must take into consideration physiological demands, being essential not only for professional tasks but also as a guarantee of their personal safety. This research aimed to investigate the influence of specific functional training (FT) with and without personal protective equipment (PPE) and self-contained breathing apparatus (SCBA) on the FFs’ cardiorespiratory fitness. Material and methods Sixty FFs were randomly allocated in three groups (EG1 training with PPE+SCBA; EG2 training with regular fitness equipment and the control group) and enrolled for a 24-week (two sessions/week) FT intervention program. FFs were assessed in anthropometric and 12-minute Cooper test, pre and post-intervention. Results Both training groups demonstrated significant improvements from baseline to post intervention EG1 VO2max (39.8 ± 6.5ml.kg−1.min−1 and 41.2 ± 5.6ml.kg−1.min−1, p < 0.001, +3.5%; EG2 VO2max 41.5 ± 8.3ml.kg−1.min−1 and 42.5 ± 7.5ml.kg−1.min−1, p < 0.05, +2.4%). Conclusions The proposed FT intervention, considering the provided equipment in all fire departments, and even without running tasks, seems to be adequate for developing FFs’ VO2max. Regular FT with PPE+SCAB must be encouraged to improve adequate VO2max and fitness levels related to firefighting specific tasks.
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Cadenas-Sanchez, Cristina, Javier Lamoneda, and Francisco Javier Huertas-Delgado. "Association of Cardiorespiratory Fitness with Achievement Motivation in Physical Education in Adolescents." International Journal of Environmental Research and Public Health 18, no. 5 (February 26, 2021): 2317. http://dx.doi.org/10.3390/ijerph18052317.
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Cardiorespiratory fitness is an important health marker in adolescents. Thus, examining the relation between cardiorespiratory fitness and motivation should be important to increase health-related behaviors. This study aimed to describe adolescents’ cardiorespiratory fitness and motivation by gender and to analyze the association between two cardiorespiratory fitness tests (original and with music) and motivation. A total of 341 adolescents (14.2 ± 1.5 years, 52.2% girls) participated in this study. Cardiorespiratory fitness was assessed using the 20 m shuttle run and its adaptation with music. Motivation was assessed though the “Achievement Motivation towards Physical Education” questionnaire. Boys presented with higher cardiorespiratory fitness and motivation (all, p < 0.05). Yet, when classifying fit and unfit groups, a higher percentage of girls were considered fit compared to boys (85.8% vs. 74.5%). A higher level of cardiorespiratory fitness (stages) and VO2max were associated with a higher level of motivation (self-perceived competence and compared competence) and lower anxiety (all p < 0.05). These associations with motivation were stronger when the music was present in the test. In this sense, including music in activities focused on cardiorespiratory fitness could increase the cardiorespiratory fitness performance and motivation, especially in girls. It should be important to increase adolescents’ cardiorespiratory fitness levels in order to increase motivation in physical education lessons and to include more motivational activities in order to achieve higher performance.
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Nunes, João Elias Dias, Heitor Santos Cunha, Renata Roland Teixeira, Foued S. Espindola, and Nádia Carla Cheik. "C-reactive protein is inversely and independently associated with maximal oxygen uptake in adolescents with obesity." Revista Brasileira de Educação Física e Esporte 34, no. 3 (September 30, 2020): 463–69. http://dx.doi.org/10.11606/issn.1981-4690.v34i3p463-469.
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The purposes of this study were: 1) investigate whether different markers of infl ammation (CRP and TNF-alpha) are correlated to cardiorespiratory fi tness in adolescents with obesity; 2) examine the association of these variables when adjusted by parameters of body composition. Were selected 57 individuals, 34 girls and 23 boys, with 16.4±1.56 years and body mass index 36.0±4.3 kg/m2. Anthropometric measurements (weight, height and abdominal circunference) and body composition (BMI, visceral fat, body fat) were assessment. Body composition was estimated by analyzer of tetrapolar bioelectrical impedance. Obesity was defi ned as BMI>95th percentile of the curve proposed by the Center for Diseases Control. Plasma TNF-alpha was measured by a quantitative two-site high-sensitivity enzyme immunoassay and CRP was measured by high-sensitivityimmunoturbidimetric assay. Graded maximal exercise testing was performed to obtain the maximum oxygen consumption (VO2max) and velocity associated with the VO2max (vVO2max). Signifi cant correlations of CRP with VO2max and vVO2max were found (r=-0.40 and r=-0,36, respectively). No correlations were observed between TNF-alpha and VO2max e vVO2max. CRP was associated to the VO2max and vVO2max independently of measurements of body composition. The CRP was independently and inversely associated with direct measurement of VO2max and the indirect variable of cardiorespiratory fitness vVO2max, in obese adolescents, even after adjustments in body composition, a potential confounding factor. No association was found between TNF-alpha and the parameters of cardiorespiratory fitness.
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Nunes, João Elias Dias, Heitor Santos Cunha, Renata Roland Teixeira, Foued S. Espindola, and Nádia Carla Cheik. "C-reactive protein is inversely and independently associated with maximal oxygen uptake in adolescents with obesity." Revista Brasileira de Educação Física e Esporte 34, no. 3 (November 20, 2020): 463–69. http://dx.doi.org/10.11606/1807-5509202000030463.
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The purposes of this study were: 1) investigate whether different markers of infl ammation (CRP and TNF-alpha) are correlated to cardiorespiratory fi tness in adolescents with obesity; 2) examine the association of these variables when adjusted by parameters of body composition. Were selected 57 individuals, 34 girls and 23 boys, with 16.4±1.56 years and body mass index 36.0±4.3 kg/m2. Anthropometric measurements (weight, height and abdominal circunference) and body composition (BMI, visceral fat, body fat) were assessment. Body composition was estimated by analyzer of tetrapolar bioelectrical impedance. Obesity was defi ned as BMI>95th percentile of the curve proposed by the Center for Diseases Control. Plasma TNF-alpha was measured by a quantitative two-site high-sensitivity enzyme immunoassay and CRP was measured by high-sensitivityimmunoturbidimetric assay. Graded maximal exercise testing was performed to obtain the maximum oxygen consumption (VO2max) and velocity associated with the VO2max (vVO2max). Signifi cant correlations of CRP with VO2max and vVO2max were found (r=-0.40 and r=-0,36, respectively). No correlations were observed between TNF-alpha and VO2max e vVO2max. CRP was associated to the VO2max and vVO2max independently of measurements of body composition. The CRP was independently and inversely associated with direct measurement of VO2max and the indirect variable of cardiorespiratory fitness vVO2max, in obese adolescents, even after adjustments in body composition, a potential confounding factor. No association was found between TNF-alpha and the parameters of cardiorespiratory fitness.
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Bhammar, Dharini M., and Lung-Chang Chien. "Quantification and Verification of Cardiorespiratory Fitness in Adults with Prehypertension." Sports 9, no. 1 (January 11, 2021): 9. http://dx.doi.org/10.3390/sports9010009.
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Background: Low cardiorespiratory fitness is associated with increased risk of hypertension and atherosclerosis in adults with prehypertension. The purpose of this study was to quantify cardiorespiratory fitness and to examine the utility of supramaximal constant-load verification testing for validating maximal oxygen uptake (VO2max) attainment in adults with prehypertension. Methods: Eleven adults (four women) with prehypertension (22.5 ± 2.9 y; body mass index (BMI): 24.6 ± 3.2 kg·m2) underwent an incremental exercise test followed 15 min later by a verification test at 105% of maximal work rate on a cycle ergometer. Results: There was no statistical difference in VO2 between the incremental (2.23 ± 0.54 L·min−1) and verification tests (2.28 ± 0.54 L·min−1; p = 0.180). Only three out of eleven participants had a higher VO2 during the verification when compared with the incremental test. If the verification test had not been conducted, one participant would have been incorrectly classified as having low cardiorespiratory fitness based on incremental test results alone. Conclusions: Verification testing validates the attainment of VO2max and can potentially reduce the over-diagnosis of functional impairment (i.e., deconditioning) in adults with prehypertension.
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Bhammar, Dharini M., and Lung-Chang Chien. "Quantification and Verification of Cardiorespiratory Fitness in Adults with Prehypertension." Sports 9, no. 1 (January 11, 2021): 9. http://dx.doi.org/10.3390/sports9010009.
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Background: Low cardiorespiratory fitness is associated with increased risk of hypertension and atherosclerosis in adults with prehypertension. The purpose of this study was to quantify cardiorespiratory fitness and to examine the utility of supramaximal constant-load verification testing for validating maximal oxygen uptake (VO2max) attainment in adults with prehypertension. Methods: Eleven adults (four women) with prehypertension (22.5 ± 2.9 y; body mass index (BMI): 24.6 ± 3.2 kg·m2) underwent an incremental exercise test followed 15 min later by a verification test at 105% of maximal work rate on a cycle ergometer. Results: There was no statistical difference in VO2 between the incremental (2.23 ± 0.54 L·min−1) and verification tests (2.28 ± 0.54 L·min−1; p = 0.180). Only three out of eleven participants had a higher VO2 during the verification when compared with the incremental test. If the verification test had not been conducted, one participant would have been incorrectly classified as having low cardiorespiratory fitness based on incremental test results alone. Conclusions: Verification testing validates the attainment of VO2max and can potentially reduce the over-diagnosis of functional impairment (i.e., deconditioning) in adults with prehypertension.
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Mas'adah, Mas'adah, Damayanti Tinduh, Nur Sulastri, and Sony Wibisono Mudjanarko. "The Effects of Moderate Intensity Treadmill Exercise with Gradual Increase of Speed and Inclination on VO2max in Men with Type 2 Diabetes Mellitus." Surabaya Physical Medicine and Rehabilitation Journal 3, no. 2 (August 27, 2021): 53. http://dx.doi.org/10.20473/spmrj.v3i2.22589.
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Background: The American College of Sport Medicine (ACSM) recommends cardiorespiratory fitness training in people with diabetes mellitus (DM) for 3-7 days a week, total duration 150 minutes a week with moderate intensity using large muscle groups. Treadmill training is the best cardiorespiratory fitness training because it involves large muscle group compared to static cycle and arm crank.Aim: To determine the effect of moderate intensity treadmill exercise with gradual increase of speed and inclination on VO2max in men with T2DM.Material and Methods: Randomized group design in 22 men with T2DM, suitable with inclusion criteria was divided into 2 groups, the experimental and control group. The experimental group received moderate intensity treadmill exercise, 3 times a week with gradual increase of speed and inclination for 4 weeks. The control group underwent standard therapy. Measurement of VO2max was performed before and after program in both groups.Results: A significant increase of VO2max in the experimental group (p = 0.003). Compared to the control group, alteration of VO2max also significant among the experimental group (p = 0.000).Conclusion: Moderate intensity treadmill exercise with gradual increase on speed and inclination for 4 weeks increase VO2max in men with T2DM.
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Jang, Won Young, Dong Oh Kang, Yoonjee Park, Jieun Lee, Woohyeun Kim, Jah Yeon Choi, Seung-Young Roh, et al. "Validation of FRIEND and ACSM Equations for Cardiorespiratory Fitness: Comparison to Direct Measurement in CAD Patients." Journal of Clinical Medicine 9, no. 6 (June 17, 2020): 1889. http://dx.doi.org/10.3390/jcm9061889.
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The regression equation of the American College of Sports Medicine (ACSM) was a preferred method for estimating maximal oxygen consumption (VO2max). Recently, a more precise equation from the fitness registry and the importance of exercise national database (FRIEND) for healthy people was developed. This study compared VO2max estimated by the ACSM and FRIEND equations to VO2max directly measured in coronary artery disease (CAD) patients. Overall, 293 CAD patients who participated in cardiac rehabilitation between June 2015 and December 2018 were analyzed. Directly measured VO2max values were compared to the ACSM and FRIEND equations. The directly measured VO2max was significantly different from the estimated VO2max by ACSM equation (24.16 vs. 28.7 mL/kg/min, p < 0.001), which was overestimated by 20% in men and 16% in women. However, there was no statistically significant difference between the directly measured VO2max and the estimated VO2max by the FRIEND equation. (24.16 vs. 24.15 mL/kg/min, p = 0.986). In CAD patients, the estimated VO2max from the ACSM equation was significantly higher than the directly measured VO2max. In addition, estimated cardiorespiratory fitness (CRF) by the FRIEND equation showed similar results with directly measured CRF. As a result, the FRIEND equation can predict CRF more accurately than the ACSM.
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Hamlin, Michael J., Meegan Fraser, Catherine A. Lizamore, Nick Draper, Jeremy P. Shearman, and Nicholas E. Kimber. "Measurement of Cardiorespiratory Fitness in Children from Two Commonly Used Field Tests After Accounting for Body Fatness and Maturity." Journal of Human Kinetics 40, no. 1 (March 1, 2014): 83–92. http://dx.doi.org/10.2478/hukin-2014-0010.
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Abstract Body fat and maturation both influence cardiorespiratory fitness, however few studies have taken these variables into account when using field tests to predict children’s fitness levels. The purpose of this study was to determine the relationship between two field tests of cardiorespiratory fitness (20 m Maximal Multistage Shuttle Run [20-MST], 550 m distance run [550-m]) and direct measurement of VO2max after adjustment for body fatness and maturity levels. Fifty-three participants (25 boys, 28 girls, age 10.6 ± 1.2 y, mean ± SD) had their body fat levels estimated using bioelectrical impedance (16.6% ± 6.0% and 20.0% ± 5.8% for boys and girls, respectively). Participants performed in random order, the 20-MST and 550-m run followed by a progressive treadmill test to exhaustion during which gas exchange measures were taken. Pearson correlation coefficient analysis revealed that the participants’ performance in the 20-MST and 550-m run were highly correlated to VO2max obtained during the treadmill test to exhaustion (r = 0.70 and 0.59 for 20-MST and 550-m run, respectively). Adjusting for body fatness and maturity levels in a multivariate regression analysis increased the associations between the field tests and VO2max (r = 0.73 for 20-MST and 0.65 for 550-m). We may conclude that both the 20-MST and the 550-m distance run are valid field tests of cardiorespiratory fitness in New Zealand 8-13 year old children and incorporating body fatness and maturity levels explains an additional 5-7% of the variance.
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Jesus, Íncare Correa de, Luis Paulo Gomes Mascarenhas, Valderi Abreu de Lima, Juliana Pereira Decimo, Suzana Nesi-França, and Neiva Leite. "MAXIMAL FAT OXIDATION DURING AEROBIC EXERCISE IN ADOLESCENTS WITH TYPE 1 DIABETES." Revista Brasileira de Medicina do Esporte 25, no. 4 (August 2019): 299–304. http://dx.doi.org/10.1590/1517-869220192504189259.
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ABSTRACT Objective: To compare maximal fat oxidation rates (FATMAX) and analyze their association with cardiorespiratory fitness in adolescents with type 1 diabetes mellitus (T1DM). Methods: Twenty-two male and female adolescents aged between 11 to 17 years, following clinical and anthropometric evaluations, were assigned to the diabetic group (DG; n = 10) or control group (CG; n = 12). Cardiorespiratory fitness was determined by maximal oxygen uptake (VO2max) during a maximal aerobic test on a cycle ergometer using the Balke protocol. Maximal fat oxidation (FATMAX) was determined by the respiratory exchange ratio proposed in the Lusk table. Results: Adolescents in the DG had lower mean FATMAX (p<0.01) and %VO2FATMAX (p=0.001) values when compared with those in the CG. FATMAX values were inversely correlated with serum glycosylated hemoglobin (HbA1c) levels (r= −0.77) and directly correlated with BMI z-scores (r=0.76), while %VO2FATMAX results were correlated with age (r=0.81), BMI z-scores (r=0.65), and VO2max values (r=0.81). On multiple linear regression, HbA1c values explained 54% (adjusted r²=0.54, p=0.009) and BMI z-scores explained 3.1% (adjusted r²=-0.031, p=0.009) of the variation in FATMAX in the DG. Adolescents with T1DM had similar cardiorespiratory fitness and lower FATMAX rates (35±11 VO2max) when compared with controls (60±12 VO2max). Conclusion: These results suggest lower fat oxidation rates and greater use of glucose as an energy substrate during exercise and worse control in T1DM. Therefore, results may contribute to appropriate exercise prescription in T1DM, after verifying exercise intensity to reduce hypoglycemia risk. Level of evidence III; Case-control study.
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Dvorak, Roman V., André Tchernof, Raymond D. Starling, Philip A. Ades, Loretta DiPietro, and Eric T. Poehlman. "Respiratory Fitness, Free Living Physical Activity, and Cardiovascular Disease Risk in Older Individuals: A Doubly Labeled Water Study*." Journal of Clinical Endocrinology & Metabolism 85, no. 3 (March 1, 2000): 957–63. http://dx.doi.org/10.1210/jcem.85.3.6432.
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Abstract The objective of this study was to examine the importance of cardiorespiratory fitness vs. physical activity energy expenditure on selected cardiovascular disease risk factors in older individuals. One hundred and seventeen older individuals, 53 men (68 ± 9 yr) and 63 women (67 ± 7 yr), participated in the study. This cohort was divided into 4 groups: 1) high cardiorespiratory fitness and high physical activity, 2) high cardiorespiratory fitness and low physical activity, 3) low cardiorespiratory fitness and high physical activity, and 4) low cardiorespiratory fitness and low physical activity. Cardiorespiratory fitness (VO2max) was determined from a graded exercise test, physical activity energy expenditure was measured by doubly labeled water and indirect calorimetry, body composition was determined by dual energy x-ray absorptiometry, and dietary practices were determined by a 3-day recall. Cardiorespiratory fitness exerted greater effects on the cardiovascular disease risk profile than physical activity. That is, older individuals with higher levels of cardiorespiratory fitness, regardless of their physical activity levels, showed lower levels of fasting insulin (P < 0.01), triglycerides (P < 0.05), total cholesterol (P < 0.05), total to high density lipoprotein cholesterol ratio (P < 0.05), low density lipoprotein (P < 0.05), and lower waist circumference (P < 0.01). Moreover, individuals with a high cardiorespiratory fitness but low physical activity energy expenditure displayed a more favorable cardiovascular disease risk profile than individuals with low cardiorespiratory fitness and high physical activity energy expenditure. The results suggest that higher levels of cardiorespiratory fitness have greater cardioprotective effects than higher levels of free living physical activity in older individuals. Although these findings do not discount the health benefits of being physically active, it is possible that greater emphasis should be placed on aerobic exercise to increase cardiorespiratory fitness in the elderly.
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Soares-Caldeira, Lúcio Flávio, Carla Cristiane da Silva, Priscila Chierotti, Nicolle de Souza Dias, and Fábio Yuzo Nakamura. "Influence of aerobic fitness on the correspondence between heart rate variability and ventilatory threshold." Revista Brasileira de Educação Física e Esporte 34, no. 4 (December 22, 2020): 555–66. http://dx.doi.org/10.11606/issn.1981-4690.v34i4p555-566.
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The aims of this study were to verify the correspondence between heart rate variability (HRV) and ventilatory thresholds during a progressive exercise test and the relationship with low and high aerobic fitness levels. Twenty male volunteers (29.5±6.2 years; 75.9±13.0 kg; 175.0±7.4 cm) were recruited. The subjects were allocated to two groups according to their VO2max <48.8 ml•kg−1•min−1 (low cardiorespiratory fitness group) (n=10) and >48.81 ml•kg−1•min−1 (high cardiorespiratory fitness group) (n=10). A progressive test was performed, consisting of 3-min stages beginning at 25 watts and increasing by 25 watts every 3-min. The HRV threshold (HRVT) and ventilatory threshold (VT) analyses were performed through visual inspection. The comparisons with RMSSD values in percentage of maximum workload resulted in a higher effect size (ES) than the SDNN values. The VO2 in the high cardiorespiratory fitness group at VT (+32%), HRVTRMSSD (+27%), and HRVTSDNN (+31%) was signifi cantly higher compared to the group with low cardiorespiratory fitness. Higher values were observed for relative load (W•kg-1) at VT and HRVTSDNN in the high cardiorespiratory fitness group in comparison with the low cardiorespiratory fitness group (P<0.05), but no difference for VT and HRVTRMSSD. Signifi cant correlations between at VT and HRVTSDNN (r=0.77) were found only in the low cardiorespiratory fitness group. Cardiorespiratory fitness should be regarded as a factor for HRVT evaluation. The HRVTSDNN was closer to the VT in the low cardiorespiratory fitness group than the HRVTRMSSD, however, the use of vagal modulation assessed using the HRV parameter was more sensitive to observe possible differences regarding cardiorespiratory fitness.
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Soares-Caldeira, Lúcio Flávio, Carla Cristiane da Silva, Priscila Chierotti, Nicolle de Souza Dias, and Fábio Yuzo Nakamura. "Influence of aerobic fitness on the correspondence between heart rate variability and ventilatory threshold." Revista Brasileira de Educação Física e Esporte 34, no. 4 (December 22, 2020): 555–66. http://dx.doi.org/10.11606/1807-5509202000040555.
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The aims of this study were to verify the correspondence between heart rate variability (HRV) and ventilatory thresholds during a progressive exercise test and the relationship with low and high aerobic fitness levels. Twenty male volunteers (29.5±6.2 years; 75.9±13.0 kg; 175.0±7.4 cm) were recruited. The subjects were allocated to two groups according to their VO2max <48.8 ml•kg−1•min−1 (low cardiorespiratory fitness group) (n=10) and >48.81 ml•kg−1•min−1 (high cardiorespiratory fitness group) (n=10). A progressive test was performed, consisting of 3-min stages beginning at 25 watts and increasing by 25 watts every 3-min. The HRV threshold (HRVT) and ventilatory threshold (VT) analyses were performed through visual inspection. The comparisons with RMSSD values in percentage of maximum workload resulted in a higher effect size (ES) than the SDNN values. The VO2 in the high cardiorespiratory fitness group at VT (+32%), HRVTRMSSD (+27%), and HRVTSDNN (+31%) was signifi cantly higher compared to the group with low cardiorespiratory fitness. Higher values were observed for relative load (W•kg-1) at VT and HRVTSDNN in the high cardiorespiratory fitness group in comparison with the low cardiorespiratory fitness group (P<0.05), but no difference for VT and HRVTRMSSD. Signifi cant correlations between at VT and HRVTSDNN (r=0.77) were found only in the low cardiorespiratory fitness group. Cardiorespiratory fitness should be regarded as a factor for HRVT evaluation. The HRVTSDNN was closer to the VT in the low cardiorespiratory fitness group than the HRVTRMSSD, however, the use of vagal modulation assessed using the HRV parameter was more sensitive to observe possible differences regarding cardiorespiratory fitness.
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Nisa, Najran, and Anna Fitriani. "The factors associated with cardiorespiratory fitness status of students at Muhammadiyah 3 Senior High School Jakarta." ARGIPA (Arsip Gizi dan Pangan) 5, no. 2 (November 13, 2020): 75–82. http://dx.doi.org/10.22236/argipa.v5i2.4013.
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The status of cardiorespiratory fitness is an indicator of importance in measuring a person’s fitness. The status of fitness cardiorespiratory is the ability of a person in supplying the heart and lungs, spreading and using oxygen is influenced by several factors such as gender, intake of nutrients, and nutritional status. This research aimed to determine the factors related to the status of cardiorespiratory fitness of students at Muhammadiyah 3 Senior High School, Jakarta. Variables were sex, nutritional status (IMT/U), energy and macronutrient intake (carbohydrates, protein, fat), and micronutrients (zinc, iron, calcium, vitamin C) intake. This is a cross-sectional study, with 85 subjects. Data were analyzed using the Spearman Correlation test and Chi-Square test. Retrieval of cardiorespiratory fitness status data was measured by means of 20-meter shuttle run in a bleep test. The study showed that the majority of subjects were male. Most of subjects had less energy, carbohydrates, protein, fat, calcium, vitamin C, zinc, and iron. The statistical test showed that there were relationship between sex and nutritional status of IMT/U with the status of cardiorespiratory fitness (VO2max). There was no correlation between energy, carbohydrates, protein, fat, vitamin C, zinc, calcium, and iron intake with the status of cardiorespiratory fitness.
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Kuswari, Mury, Nazhif Gifari, and Aditya Himarwan. "Effects of Aerobic Endurance Training vs HIIT on Energy Intake, Macronutrient Intake, and VO2Max Level on Fitness Centre Participants." INSPIREE: Indonesian Sport Innovation Review 2, no. 3 (July 10, 2021): 179–86. http://dx.doi.org/10.53905/inspiree.v2i3.48.
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The purpose of the study Nowadays, there are many people who participate in fitness centre to maintain their health and fitness. There are many ways to increase VO2Max, an indicator of cardiorespiratory fitness, two of many were High-Intensity Interval Training (HIIT) and traditional aerobic endurance training. In other hand exercise in any type of way required extra energy, resulting in increased energy and macronutrient intake. Was to analyse the effects of HIIT vs. Aerobic Endurance Exercise on energy intake, macronutrient intake, and VO2Max of fitness centre participants in Depok.. Materials and methods 26 participants were recruited voluntarily from one of fitness centre in Depok, West Java, Indonesia, then randomized into HIIT Intervention Group and aerobic endurance exercise intervention group for 3 months. Energy and macronutrient intake were assessed before and after intervention. Bleep test was done to determine VO2Max Level before and after intervention. Results. Paired t-test between before and after intervention showed that there’s significant difference (p<0.05) on VO2Max, while independent sample t-test showed that there’s no significant difference between both type of exercise. Conclusions. This study shows that there was no effect of both HIIT and Aerobic Endurance Training on energy and macronutrient intake. However, both interventions increase VO2Max as an indicator of fitness level. Shorter time for HIIT may be useful for increasing VO2Max level on busy individual.
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Muntaner-Mas, Adria, Antonio Martinez-Nicolas, Alberto Quesada, Cristina Cadenas-Sanchez, and Francisco B. Ortega. "Smartphone App (2kmFIT-App) for Measuring Cardiorespiratory Fitness: Validity and Reliability Study." JMIR mHealth and uHealth 9, no. 1 (January 8, 2021): e14864. http://dx.doi.org/10.2196/14864.
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Background There is strong evidence suggesting that higher levels of cardiorespiratory fitness (CRF) are associated with a healthier metabolic profile, and that CRF can serve as a powerful predictor of morbidity and mortality. In this context, a smartphone app based on the 2-km walk test (UKK test) would provide the possibility to assess CRF remotely in individuals geographically distributed around a country or continent, and even between continents, with minimal equipment and low costs. Objective The overall aim of this study was to evaluate the validity and reliability of 2kmFIT-App developed for Android and iOS mobile operating systems to estimate maximum oxygen consumption (VO2max) as an indicator of CRF. The specific aims of the study were to determine the validity of 2kmFIT-App to track distance and calculate heart rate (HR). Methods Twenty participants were included for field-testing validation and reliability analysis. The participants completed the UKK test twice using 2kmFIT-App. Distance and HR were measured with the app as well as with accurate methods, and VO2max was estimated using the UKK test equation. Results The validity results showed the following mean differences (app minus criterion): distance (–70.40, SD 51.47 meters), time (–0.59, SD 0.45 minutes), HR (–16.75, SD 9.96 beats/minute), and VO2max (3.59, SD 2.01 ml/kg/min). There was moderate validity found for HR (intraclass correlation coefficient [ICC] 0.731, 95% CI –0.211 to 0.942) and good validity found for VO2max (ICC 0.878, 95% CI –0.125 to 0.972). The reliability results showed the following mean differences (retest minus test): app distance (25.99, SD 43.21 meters), app time (–0.15, SD 0.94 seconds), pace (–0.18, SD 0.33 min/km), app HR (–4.5, 13.44 beats/minute), and app VO2max (0.92, SD 3.04 ml/kg/min). There was good reliability for app HR (ICC 0.897, 95% CI 0.742-0.959) and excellent validity for app VO2max (ICC 0.932, 95% CI 0.830-0.973). All of these findings were observed when using the app with an Android operating system, whereas validity was poor when the app was used with iOS. Conclusions This study shows that 2kmFIT-App is a new, scientifically valid and reliable tool able to objectively and remotely estimate CRF, HR, and distance with an Android but not iOS mobile operating system. However, certain limitations such as the time required by 2kmFIT-App to calculate HR or the temperature environment should be considered when using the app.
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Verstynen, Timothy D., Brighid Lynch, Destiny L. Miller, Michelle W. Voss, Ruchika Shaurya Prakash, Laura Chaddock, Chandramallika Basak, et al. "Caudate Nucleus Volume Mediates the Link between Cardiorespiratory Fitness and Cognitive Flexibility in Older Adults." Journal of Aging Research 2012 (2012): 1–11. http://dx.doi.org/10.1155/2012/939285.
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The basal ganglia play a central role in regulating the response selection abilities that are critical for mental flexibility. In neocortical areas, higher cardiorespiratory fitness levels are associated with increased gray matter volume, and these volumetric differences mediate enhanced cognitive performance in a variety of tasks. Here we examine whether cardiorespiratory fitness correlates with the volume of the subcortical nuclei that make up the basal ganglia and whether this relationship predicts cognitive flexibility in older adults. Structural MRI was used to determine the volume of the basal ganglia nuclei in a group of older, neurologically healthy individuals (mean age 66 years,N=179). Measures of cardiorespiratory fitness (VO2max), cognitive flexibility (task switching), and attentional control (flanker task) were also collected. Higher fitness levels were correlated with higher accuracy rates in the Task Switching paradigm. In addition, the volume of the caudate nucleus, putamen, and globus pallidus positively correlated with Task Switching accuracy. Nested regression modeling revealed that caudate nucleus volume was a significant mediator of the relationship between cardiorespiratory fitness, and task switching performance. These findings indicate that higher cardiorespiratory fitness predicts better cognitive flexibility in older adults through greater grey matter volume in the dorsal striatum.
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Kabiri, Laura S., Katy Mitchell, Wayne Brewer, and Alexis Ortiz. "Muscular and Cardiorespiratory Fitness in Homeschool versus Public School Children." Pediatric Exercise Science 29, no. 3 (August 2017): 371–76. http://dx.doi.org/10.1123/pes.2017-0028.
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Purpose:The growth and unregulated structure of homeschooling creates an unknown population in regard to muscular and cardiorespiratory fitness. The purpose of this research was to compare muscular and cardiorespiratory fitness between elementary school aged homeschool and public school children.Method:Homeschool children ages 8–11 years old (n = 75) completed the curl-up, 90° push-up, and Progressive Aerobic Capacity Endurance Run (PACER) portions of the FitnessGram to assess abdominal and upper body strength and endurance as well as cardiorespiratory fitness. Comparisons to public school children (n = 75) were made using t tests and chi-square tests.Results:Homeschool children showed significantly lower abdominal (t(148) = -11.441, p < .001; χ2 (1) = 35.503, p < .001) and upper body (t(148) = -3.610, p < .001; χ2 (1) = 4.881, p = .027) strength and endurance. There were no significant differences in cardiorespiratory fitness by total PACER laps (t(108) = 0.879, p = .381) or estimated VO2max (t(70) = 1.187, p = .239; χ2 (1) = 1.444, p = .486).Conclusion:Homeschool children showed significantly lower levels of both abdominal and upper body muscular fitness compared with their age and gender matched public school peers but no difference in cardiorespiratory fitness.
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C. de Sousa, Maria do Socorro, Rodrigo R. Aniceto, Gabriel R. Neto, Ravi C. T. de Araújo, Juliana B. C. de Sousa, José A. D. Costa, and Idico L. Pellegrinotti. "Development and Validation of an Automated Step Ergometer." Journal of Human Kinetics 43, no. 1 (December 1, 2014): 113–24. http://dx.doi.org/10.2478/hukin-2014-0096.
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Abstract Laboratory ergometers have high costs, becoming inaccessible for most of the population, hence, it is imperative to develop affordable devices making evaluations like cardiorespiratory fitness feasible and easier. The objective of this study was to develop and validate an Automated Step Ergometer (ASE), adjusted according to the height of the subject, for predicting VO2max through a progressive test. The development process was comprised by three steps, the theoretical part, the prototype assembly and further validation. The ASE consists in an elevating platform that makes the step at a higher or lower level as required for testing. The ASE validation was obtained by comparing the values of predicted VO2max (equation) and direct gas analysis on the prototype and on a, treadmill. For the validation process 167 subjects with average age of 31.24 ± 14.38 years, of both genders and different degrees of cardiorespiratory fitness, were randomized and divided by gender and training condition, into untrained (n=106), active (n=24) and trained (n=37) subjects. Each participant performed a progressive test on which the ASE started at the same height (20 cm) for all. Then, according to the subject’s height, it varied to a maximum of 45 cm. Time in each stage and rhythm was chosen in accordance with training condition from lowest to highest (60-180 s; 116-160 bpm, respectively). Data was compared with the student’s t test and ANOVA; correlations were tested with Pearson’s r. The value of α was set at 0.05. No differences were found between the predicted VO2max and the direct gas analysis VO2max, nor between the ASE and treadmill VO2max (p= 0.365) with high correlation between ergometers (r= 0.974). The values for repeatability, reproducibility, and reliability of male and female groups measures were, respectively, 4.08 and 5.02; 0.50 and 1.11; 4.11 and 5.15. The values of internal consistency (Cronbach’s alpha) among measures were all >0.90. It was verified that the ASE prototype was appropriate for a step test, provided valid measures of VO2max and could therefore, be used as an ergometer to measure cardiorespiratory fitness.
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de Lima, Valderi Abreu, Luis Paulo Gomes Mascarenhas, Juliana Pereira Decimo, William Cordeiro de Souza, Anna Louise Stellfeld Monteiro, Ian Lahart, Suzana Nesi França, and Neiva Leite. "Physical Activity Levels of Adolescents with Type 1 Diabetes Physical Activity in T1D." Pediatric Exercise Science 29, no. 2 (May 2017): 213–19. http://dx.doi.org/10.1123/pes.2016-0199.
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The aim of this study was to evaluate the level of physical activity and cardiorespiratory fitness in teenagers with type 1 diabetes mellitus (T1D) in comparison with healthy scholar participants. Total of 154 teenagers (T1D = 45 and CON = 109). Height, weight, cardiorespiratory fitness (VO2max), and the level of physical activity by the Bouchard’s Physical Activity Record were measured, and glycated hemoglobin (HbA1c) in T1D. The VO2max was lower in the T1D (38.38 ± 7.54) in comparison with the CON (42.44 ± 4.65; p < .05). The VO2max had correlation with the amount of time of moderate-to-vigorous physical activity (r = .63; p = .0001) and an inverse correlation with sedentary activities (r= -0.46; p = .006). In the T1D the levels of HbA1c had an inverse correlation with the amount of time of moderate-to-vigorous physical activity (r= -0.34; p = .041) and correlation with the BMI z-score (r = .43; p = .017). Only 37,8% of the participants in the T1D reached the adequate amount of daily moderate-to-vigorous intensity physical activity, in the CON 81,7% reached the WHO’s recommendation. Conclusion: T1D had less cardiorespiratory capacity then healthy controls, the teenagers of T1D with lower BMI z-score and that dedicated a greater time in moderate-to-vigorous intensity physical activity demonstrated a better glycemic control.
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Paramitha, Aditya, Sri Wahyudati, Wahyu Wiryawan, and Sefri Noventi Sofia. "Pengaruh Threshold Inspiratory Muscle Training Praoperasi terhadap Kebugaran Kardiorespirasi Pascabedah Ganti Katup Jantung." Medica Hospitalia : Journal of Clinical Medicine 7, no. 1 (May 18, 2020): 82–90. http://dx.doi.org/10.36408/mhjcm.v7i1.433.
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Latar Belakang: Penyakit katup jantung memberikan beban kesehatan yang besar di seluruh dunia. Pasien yang menjalani bedah ganti katup jantung di RSUP Dr. Kariadi Semarang pada tahun 2018 adalah sebanyak 111 pasien. Pada pasien pasca bedah ganti katup jantung terjadi penurunan kebugaran kardiorespirasi. Kebugaran kardiorespirasi dapat diukur melalui pengukuran VO2max. Penambahan threshold inspiratory muscle training (Threshold IMT) praoperasi dianggap mampu menaikkan baseline kebugaran kardiorespirasi sehingga hasil keluaran pascabedah menjadi lebih baik, menurunkan risiko dan komplikasi operasi serta mempersingkat waktu pemulihan dan lama perawatan.
Tujuan: Mengetahui pengaruh penambahan Threshold IMT praoperasi terhadap kebugaran kardiorespirasi pasien pascabedah ganti katup jantung.
Metode: Penelitian ini merupakan penelitian quasi experimental. Pengambilan sampel penelitian dilakukan secara consecutive sampling, subyek dibagi menjadi kelompok perlakuan (n=9) dan kelompok kontrol (n=9). Kelompok perlakuan diberikan latihan rehabilitasi medik konvensional rutin sebelum bedah ganti katup jantung sesuai dengan Panduan Praktik Klinis (PPK) serta ditambahkan Threshold IMT sesuai protokol penelitian. Kelompok kontrol hanya melakukan latihan rehabilitasi medik konvensional.
Hasil: Terdapat perbedaan yang bermakna secara klinis antar kelompok perlakuan dan kontrol pascabedah dengan minimal clinically important difference lebih dari 6%. Terdapat perbedaan yang bermakna secara statistik untuk nilai VO2max pra dan pascaperlakuan dalam kelompok perlakuan (p=0,021), serta antar kelompok perlakuan dan kontrol pascaperlakuan (p=0,026).
Kesimpulan: Penambahan Threshold IMT praoperasi meningkatkan kebugaran kardiorespirasi pasien pra dan pascabedah ganti katup jantung.
Kata kunci: Threshold inspiratory muscle training, VO2max.
Background: Heart valve disease presents a huge health burden worldwide. Patients who underwent cardiac valve replacement surgery at RSUP Dr. Kariadi Semarang in 2018 were 111 patients. Cardiorespiratory fitness declined in post-surgical patients. Cardiorespiratory fitness can be measured through VO2max. Additional preoperative threshold inspiratory muscle training (Threshold IMT) is considered to safely increase cardiorespiratory fitness baseline, reduce the risks and complications of surgery as well as shorter recovery time and treatment duration, thus postoperative outcomes will be better.
Objective: To determine the effect of additional preoperative Threshold IMT on cardiorespiratory fitness in post heart valve replacement surgery patients.
Method: This study is quasi experimental. Sampling was done by consecutive sampling, subjects were divided into two groups, intervention group (n=9) and control group (n=9). The intervention group was given routine conventional medical rehabilitation exercise before heart valve replacement surgery according to the Clinical Practice Guide (PPK) and added Threshold IMT according to the study protocol. The control group only did conventional medical rehabilitation exercises.
Results: There was clinically significant difference post surgery between intervention and control groups with minimal clinically important difference of more than 6%. Statistically significant differences were obtained for the VO2max values ??pre and post treatment in the intervention group (p = 0.021) and between the intervention and control groups (p = 0.026) post-treatment.
Conclusion: Addition of preoperative Threshold IMT increases cardiorespiratory fitness pre- and post-operative in heart valve replacement surgery patients.
Keyword: Threshold inspiratory muscle training, VO2max.
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Bandyopadhyay, Amit. "Cooper’s 12 min run test: Its validity in Indian swimmers and volleyball players." Indian Journal of Physiology and Pharmacology 64 (February 27, 2021): 265–71. http://dx.doi.org/10.25259/ijpp_46_2020.
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Objectives: VO2max is globally considered as the gold standard to evaluate the cardiorespiratory fitness that is an essential component to judge one’s aerobic fitness level. The present study was aimed to enumerate the validity for application of Cooper’s 12 min run test (CRT) in predicting VO2max among Indian swimmers and volleyball players. Materials and Methods: Swimmers (male = 66, female = 70) and volleyball players (male = 88, female = 81) were recruited by simple random sampling from reputed clubs of Kolkata. They were segregated into study and confirmatory groups. VO2max was determined by graded incremental cycle ergometer test followed by expired gas analysis and indirect CRT method. Results: Predicted VO2max (PVO2max) showed significant difference with the directly measured VO2max (VO2max) in study groups of both sports. Limits of agreement between PVO2max and VO2max proved inapplicability of current CRT protocol in studied populations. Modified population specific equations were computed from significant correlation of VO2max with distance covered in Cooper run test. Application of these norms in confirmatory groups revealed insignificant difference between PVO2max and VO2max in both genders. Conclusion: Modified equations are validated for application of CRT in evaluating VO2max in swimmers and volleyball players of both genders of Kolkata, India.
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Tsiroukidou, Kyriaki, Elpis Hatziagorou, Maria G. Grammatikopoulou, Anastasios Vamvakis, Kalliopi Kontouli, Christos Tzimos, John Tsanakas, and Bessie E. Spiliotis. "Cardiorespiratory Fitness Predicted by Fibrinogen and Leptin Concentrations in Children with Obesity and Risk for Diabetes: A Cross-Sectional Study and a ROC Curve Analysis." Nutrients 13, no. 2 (February 19, 2021): 674. http://dx.doi.org/10.3390/nu13020674.
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Obesity is defined as abnormal or excessive fat accumulation that presents a risk to health. The ability to exercise is affected by adiposity, and this mechanism involves low-grade chronic inflammation and homeostatic stress produced mainly in adipocytes, which can result in abnormal adipokine secretion. To date, the gold standard for cardiorespiratory fitness assessment is considered to be the maximum oxygen uptake (VO2max). The aim of the present study was to assess the prognostic value of hematological parameters of childhood obesity, as potential predictors of cardiorespiratory fitness (VO2max), using a sample of children and adolescents with obesity and risk for diabetes. A total of 84 clinically healthy children and adolescents were recruited, of which 21 were considered lean, 22 overweight and 41 obese, with a mean age of 12.0 ± 1.9, 11.4 ± 2.0, and 11.2 ± 2.1 years old, in each weight status category, respectively. Age and sex did not differ between groups. Hematologic testing was performed after 12 h of fasting including glucose, serum lipids, insulin, hc-CRP, adiponectin, leptin and fibrinogen levels. Cardiorespiratory capacity for exercise was assessed to determine VO2max, using a cycle ergometer. The VO2max was negatively correlated with progressive strength to the BMIz (−0.656, p ≤ 0.001), hs-CRP (r = −0.341, p ≤ 0.002), glucose (r = −0.404, p ≤ 0.001) and insulin levels (r = −0.348, p ≤ 0.001), the homeostasis model assessment of insulin resistance (HOMA-IR) (r = −0.345, p ≤ 0.002), as well as to the leptin (r = −0.639, p ≤ 0.001) and fibrinogen concentrations (r = −0.520, p ≤ 0.001). The multivariate analysis revealed that only leptin and fibrinogen concentrations could predict the VO2max adjusted for the BMIz of participants. The receiver operating characteristic (ROC) curve for the diagnostic accuracy of leptin, hs-CRP and fibrinogen concentrations for the prediction of VO2max revealed a good diagnostic ability for all parameters, with leptin being the most promising one (area under the curve (AUC): 99%). The results verify that in children with obesity, VO2max may be predicted from hematological parameters (leptin and fibrinogen), possibly bypassing more invasive methods.
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Lubans, David R., Philip J. Morgan, Robin Callister, and Clare E. Collins. "The Relationship between Pedometer Step Counts and Estimated VO2Max as Determined by a Submaximal Fitness Test in Adolescents." Pediatric Exercise Science 20, no. 3 (August 2008): 273–84. http://dx.doi.org/10.1123/pes.20.3.273.
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The purpose of this study was to examine the relationship between pedometer step counts and estimated VO2max as determined by a submaximal exercise test. Participants (N = 115; 65 girls, 50 boys) wore pedometers for five days and completed the Queen’s College Step Test (QCST). Based on these results participants were classified as HIGH, MOD, or LOW cardiorespiratory fitness. Boys accumulated more steps per day (p < .05) than girls (12,766 ± 4,923 versus 10,887 ± 2,656). The relationship between estimated VO2max and mean steps/day was moderate (r = .34, p < .01). Participants classified as having HIGH fitness levels accumulated more steps/day than LOW-fit adolescents (p < .05). The results from this study suggest that estimated VO2max as determined by a submaximal exercise test is moderately associated with mean steps/day in adolescents.
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Petkus, Andrew, Megan Gomez, Dawn Schiehser, Vincent Filoteo, Jennifer Hui, Behnaz Jarrahi, Sarah McEwen, and Giselle Petzinger. "Thalamic Volume Mediates Associations Between Cardiorespiratory Fitness and Memory in People With Parkinson’s." Innovation in Aging 4, Supplement_1 (December 1, 2020): 501–2. http://dx.doi.org/10.1093/geroni/igaa057.1619.
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Abstract Cognitive deficits occur in patients with Parkinson’s disease (PD), and cardiorespiratory fitness (CRF) is associated with both current and future cognitive decline in this disease. The underlying neurobiological factors explaining this relationship, however, are not well known. In this cross-sectional study we examined the associations between CRF and cognitive performance and whether such associations were mediated by grey matter volumes of basal ganglia structures. A total of 33 individuals with PD underwent structural magnetic resonance imaging (sMRI), CRF evaluation (VO2max), and neuropsychological assessment. Composite scores of episodic memory, executive functioning, attention, language, and visuospatial functioning were generated. Brain MRI morphological measurements was performed with the Freesurfer image analysis suite. Structural equation models were constructed to examine whether sMRI volume estimates of basal ganglia structures, specifically the thalamus and pallidum, mediated associations between VO2 max and cognitive performance while adjusting for age, education, PD disease duration, sex, and intracranial volume. Higher VO2max was associated with better episodic memory (Standardized β=0.390; p=0.009), executive functioning (Standardized β=0.263; p=0.021), and visuospatial performance (β=0.408; p=0.004). Higher VO2max was associated with larger thalamic (Standardized β=0.602; p<0.001) and pallidum (Standardized β=0.539; p<0.001) volumes. Thalamic volume significantly mediated the association between higher VO2max and better episodic memory (indirect effect=0.209) and visuospatial ability (indirect effect=0.178) performance (p<.05). The pallidum did not significantly mediate associations between VO2 max and cognitive outcomes. These results suggest the thalamus plays an important role in the association between CRF episodic memory and visuospatial functioning in individuals with PD.
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Tanner, Makenna, James LeCheminant, Emily Patten, and Ron Hager. "Body Fat, Cardiorespiratory Fitness, Carotid Artery Thickness Among Older Adults Participating in the Senior Games." Current Developments in Nutrition 5, Supplement_2 (June 2021): 55. http://dx.doi.org/10.1093/cdn/nzab033_055.
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Abstract Objectives To determine the relationship among body fat, cardiorespiratory fitness, and carotid artery thickness in a large group of older adults. Methods Data were collected at the Huntsman World Senior Games held in St. George, Utah between 2016–2019. Participants visited the Dixie Convention Center (St. George, UT) for free health screenings associated with the Games. The data were cross-sectional; for repeat participants only the most recent results were analyzed. The measures of interest for this study included: body fat, body mass index (BMI), cardiorespiratory fitness (predicted VO2max), and carotid artery intima media thickness (CIMT). Body fat percentage was measured using bioelectrical impedance. BMI was calculated via weight (kg) and height (m2). Predicted VO2max was calculated at rest using a heart rate monitor and the validated Polar fitness test. CIMT was obtained via images of the right and left carotid arteries, visualized and captured with a portable diagnostic ultrasound system. Differences by sex were determined using independent t-tests. Multiple regression was used to examine associations between measures. Results For this analysis, 649 participants (232 women; 326 men; 68.13 ± 8.71 y, 25.15 ± 4.92 kg/m2) were included. Women had a higher body fat percentage than men (32.00 vs. 22.42%) (t < 0.0001). However, men had a significantly higher BMI (26.28 vs. 24.01 kg/m2) and cardiorespiratory fitness (40.22 vs. 38.82 ml/kg/min) (t < 0.05) than women. Accounting for age and sex, body fat % significantly predicted CIMT thickness (P < 0.05) but BMI (P = 0.0853) and cardiorespiratory fitness did not predict CIMT thickness (P > 0.05). Conclusions CIMT thickness appears to be related to body fat percentage among older adults. Subsequent studies could examine how reduction in body fat changes CIMT thickness and how that influences risk of chronic disease, such as stroke. Funding Sources There was no funding for this project.
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Santi-Cano, Mª José, José Pedro Novalbos-Ruiz, María Ángeles Bernal-Jiménez, María del Mar Bibiloni, Josep A. Tur, and Amelia Rodriguez Martin. "Association of Adherence to Specific Mediterranean Diet Components and Cardiorespiratory Fitness in Young Adults." Nutrients 12, no. 3 (March 15, 2020): 776. http://dx.doi.org/10.3390/nu12030776.
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Objective: Cardiorespiratory fitness (CRF) and a healthy diet may be part of an overall healthy lifestyle. The association between cardiorespiratory fitness and adherence to an overall Mediterranean Diet (MedD) pattern and specific MedD foods has been assessed. Design: Subjects completed a lifestyle survey and dietary pattern, using the validated MedD Adherence 14-item questionnaire and two self-reported 24-h dietary recalls. Participants’ height, body weight, waist circumference (WC), and CRF (maximum oxygen uptake, VO2max, ml/kg/min) were measured. Setting: University of Cádiz, Spain. Subjects: A sample of young adults (n = 275, 22.2 ± 6.3 years). Results: Mean VO2max was 43.9 mL/kg/min (SD 8.5 mL/kg/min). Most participants had healthy CRF (75.9%). The average MedD score was 6.2 points (SD 1.8 points). Participants who consumed more servings of nuts had higher VO2max. Those who showed low CRF performed less physical activity (PA) and had a higher body mass index (BMI) and WC compared with those classified as having healthy CRF. Nut consumption was positively associated with VO2max (β = 0.320; 95% CI 2.4, 10.7; p < 0.002), adjusting for sex, age, smoking PA, BMI, WC, and energy intake, showing the subjects who consumed more nuts were fitter than young adults who consumed less. Conclusions: CRF is positively associated with nut consumption but not with the overall MedD pattern and all other MedD foods in the young adults. The subjects who consumed more servings of nuts were fitter than young adults who consumed less. Moreover, fitter subjects performed more PA and had a lower BMI and WC than those who had lower fitness levels.
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Alahmari, Khalid A., Kanagaraj Rengaramanujam, Ravi Shankar Reddy, Paul Silvian Samuel, Venkata Nagaraj Kakaraparthi, Irshad Ahmad, and Jaya Shanker Tedla. "Cardiorespiratory Fitness as a Correlate of Cardiovascular, Anthropometric, and Physical Risk Factors: Using the Ruffier Test as a Template." Canadian Respiratory Journal 2020 (September 8, 2020): 1–10. http://dx.doi.org/10.1155/2020/3407345.
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Background. Assessment of cardiorespiratory fitness (CRF) is a standard procedure in routine clinical practices. Early identification of risk factors through screening is vital in the fight against chronic diseases. Evaluation of CRF can impose cost implications in the clinical setting; thus, a simple and easy-to-use test is to be advocated. The Ruffier test is a simple test that can assess CRF, and it is necessary to find whether the test reflects the effects of compounding factors in CRF. Objective. This study aims to determine the association between CRF (estimated VO2max) with cardiovascular, anthropometric, and physical risk factors using the Ruffier test. Methods. A cross-sectional study with a sample of 52 male participants was conducted. Before the Ruffier test, each participant’s body weight, height, waist circumference, skinfold thickness, thigh length, lower-limb length, thigh circumference, physical activity, blood pressure, smoking, diabetes, and pulmonary functions were recorded, and these factors correlated with CRF. Results. There was a significant inverse relationship found between the estimated VO2max and age, height, body weight, body mass index, waist circumference, a sum of skinfold, fat percentage, thigh length, lower-limb length, thigh circumference, smoking, blood pressure, heart rates, and diabetes p<0.05. A significant positive correlation was found between the estimated VO2max with physical activity and respiratory functions p<0.05. In the multivariable model, body weight and resting heart rate were significantly inversely associated with the estimated VO2maxp<0.05. Conclusion. Using the Ruffier test, various risk factors of CRF are correlated with the estimated VO2max. This test reflects the effects of different compounding factors on CRF; therefore, it can be used in routine clinical practices to identify the risk factors early.
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Keohane, David, Trevor Woods, Yvonne McCarthy, Patrick O'Connor, Sean Underwood, and Michael Molloy. "A Repeated-measures Case Series of Physiological Responses to a Transoceanic Rowing Race." International Journal of Sports Medicine 40, no. 03 (January 14, 2019): 152–57. http://dx.doi.org/10.1055/a-0802-9140.
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AbstractThis repeated-measures case series describes the changes in cardiorespiratory fitness, body composition and systemic inflammation in 4 well-trained athletes pre- and post-completion of an unsupported transatlantic rowing race. The acute effects of endurance exercise have been well described previously, but the enduring consequences of ultra-endurance on the cardiorespiratory, metabolic and immune systems are largely unknown. This study explores these physiological adaptations following 2 weeks of recovery. Cardiorespiratory fitness testing, body composition analysis, and blood sampling for inflammatory cytokines were recorded immediately before race departure and repeated 14 days following race completion. Mean VO2max (ml/kg/min) was similar pre- (48.2±2.8) and post-race (46.7±1.5). Heart rate responses were equivalent at incremental workloads. Mean blood lactate (mmol/L) was higher at low to moderate power outputs and lower at maximal effort (14.6±1.85 vs. 13.1±2.5). Percentage body fat (17.7 ± 7.9 vs. 16.2±7.4) was analogous to pre-race analysis. Low-grade inflammation persisted, indicated by an increase in IL-1β (69%), IL-8 (10%), TNF-α (8%), IL-6 (5.4%), and C-reactive protein (22.4%). VO2max and heart rate responses were similar pre- and post-race, but sub-maximal efficiency measures of cardiorespiratory fitness were consistent with persistent fatigue. Body composition had returned to baseline but low-grade systemic inflammation persisted. Persistent pro-inflammatory cytokinaemia is known to exert deleterious consequences on immune, metabolic, and psychological function. Adequate recovery is necessary to re-establish inflammatory homeostasis, and the results of this study may inform these decisions.
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Räsänen, K., H. Lamberg, on behalf of Timo Lakka, Pekka Arikoski, and Eija Piippo-Savolainen. "FRI0470 CARDIORESPIRATORY FITNESS IN JUVENILE IDIOPATHIC ARTHRITIS IN 6 – 17-YEAR-OLD CHILDREN- CROSS-SECTIONAL STUDY." Annals of the Rheumatic Diseases 79, Suppl 1 (June 2020): 832.2–832. http://dx.doi.org/10.1136/annrheumdis-2020-eular.675.
Full textAbstract:
Background:Children with juvenile idiopathic arthritis (JIA) have been found to have reduced cardiorespiratory fitness and lower physical activity. Poor cardiorespiratory fitness is associated with a risk of cardiometabolic diseases.Objectives:The aim of this study was to study the levels of cardiorespiratory fitness, respiratory function and hemodynamic responses during and after maximal cycle ergometer exercise test in children with JIA aged 6-17 years and compare the results with healthy controls.Methods:Study group in this analysis consisted of 43 patients with JIA who were treated in Department of Pediatrics in Kuopio University Hospital, Finland and 40 healthy age- and sex matched controls. Maximal exercise tests were carried out with an electromagnetic cycle ergometer using a pediatric saddle module. Maximal workload per kilogram (Wmax/kg) was used as a measure of cardiorespiratory fitness and was presented relative to bodyweight. In addition the peak values of VO2per kilogram (VO2max/kg) were used as a measure of highest amount of oxygen that an individual can consume during exercise. Values of VO2maxwere collected from respiratory gases measured directly from breath by breath method and was presented relative to body weight.Physical activity and sedentary behavior (minutes per day) was assessed by the PANIC (Physical activity and nutrition in children -study) Physical Activity Questionnaire which the participants filled.Results:Statistical analyses were performed for 43 children with JIA and 40 controls. Mean age in JIA group was 12.09 years (95%Cl 11.04-13.14), and 11.72 years (95%CI 10.52-12.93) in controls (p=0.572). Mean body mass index for age (BMI) was 22.58 kg/m2(95%CI 21.54-23.62) in JIA and 18.95 kg/m2(95%CI 17.73-20.16) in controls (p<0.05). In JIA group BMI was 19.18 % higher compared to controls. Mean physical activity in JIA group was 94.11 minutes per day (95% Cl 81.09-107.13), and 122.54 minutes per day (95% CI 102.84-142.24) in controls, thus JIA group was 23.20 % less physically active than controls (p=0.015).Mean Wmax/kg was 2.65 W/kg (95% CI 2.49-2.82) in JIA and 3.01 W/kg (95%CI 2.86-3.15) in controls thus Wmax/kg in JIA was 0.36 W/kg (11.8 %) lower than in controls, (p = 0.002). VO2max/kg was 37.00 (95%CI 33.96-40.84) ml/kg/min in JIA and 43.30 (95%CI 40.79-45.82) ml/kg/min in controls thus in JIA group mean VO2max/kg was 6.3 ml/kg/min (14.4 %) lower than in controls (p=0.001).Conclusion:Children with JIA were found to have significantly lower cardiorespiratory fitness. In addition, BMI in JIA patients was higher compared to healthy age- and sex-matched controls. Impaired cardiorespiratory fitness and higher BMI may predispose children with JIA to cardiometabolic comorbidities later in life. In addition to disease-control, more attention should be paid to maintaining good cardiorespiratory fitness and normal BMI in these patients already before adulthood.References:[1]M Nørgaard, M Twilt, LB Andersen & T Herlin (2016) Accelerometry-based monitoring of daily physical activity in children with juvenile idiopathic arthritis, Scandinavian Journal of Rheumatology, 45:3, 179-187,[2]Maggio, A.B.R., Hofer, M.F., Martin, X.E. et al. Reduced physical activity level and cardiorespiratory fitness in children with chronic diseases. Eur J Pediatr 169, 1187–1193 (2010)[3]Bohr, AH., Fuhlbrigge, R.C., Pedersen, F.K. et al. Premature subclinical atherosclerosis in children and young adults with juvenile idiopathic arthritis. A review considering preventive measures. Pediatr Rheumatol (2016)14: 3.Acknowledgments:Panu Karjalainen1, Timo Pitkänen1, Anneli Paloranta2, Kirsi Saastamoinen11University of Eastern Finland 2 Kuopio university hospital, FinlandDisclosure of Interests:None declared