Academic literature on the topic 'Kinesiology – Sex differences'

Physical activity, campus recreation (CR) use, body mass index (BMI), and varied health indices were compared between academic discipline groups and sex. Participants ( n = 219) were classified as AD I (kinesiology and physical education majors), AD II (health science majors and nursing majors), and AD III (representative sample of non-health-related majors) to make between-group comparisons based on the amount of emphasis placed on physical activity and health-related content within different disciplines. Significant differences ( p < .05) were found between the academic discipline groups for International Physical Activity Questionnaire scores, CR minutes, CR days, CR time per day, vigorous physical activity (VPA), and perceived-health score; and between sex for BMI, VPA, sitting, fiber intake, and fruit and vegetable intake. The results indicate a positive relationship between the emphasis placed physical activity and health within an academic discipline and the degree to which students participate in physical activity, positive health behaviors, and perceived health.

Background. Although previous studies have reported weight bias among students and professionals in exercise science, physical education, kinesiology, and fitness instruction, predictors of weight bias in these professions have not been extensively reviewed. Aim. The purpose of this scoping review was to explore the available literature on predictors of weight bias in exercise science students and fitness professionals to identify key concepts and research gaps. Methods. PubMed and ERIC were searched from January 1990 to May 2019. Eighteen studies were included in this review. A thematic analysis was conducted. Findings. Six main themes were drawn from these studies including beliefs in the personal controllability of weight; sex differences; enrollment in a health sciences-related program; psychosocial and personal factors; knowledge of obesity; lack of personal history, family, or friend with obesity. Our scoping review highlighted diverse predictors of weight bias among exercise science students and professionals that warrant further study and intervention.

Abstract Objectives Consumption and biomarker status of the xanthophyll-carotenoids lutein + zeaxanthin and the dietary component choline have been linked to benefits in cognition. However, knowledge on the interactive influence of these dietary components on cognition is sparse. We examined associations between dietary and bio-markers of lutein + zeaxanthin, choline, and cognitive flexibility among adults with overweight and obesity. Methods 80 adults with overweight and obesity completed 7-day diet records, venous blood draws, heterochromatic flicker photometry for assessment of macular pigmentation (MPOD), the Kaufman Brief Intelligence Test–2 (IQ), and a Switch task of cognitive flexibility while undergoing electroencephalographic recording (ERP). Multiplicative interaction terms were calculated to assess interactive capabilities. Hierarchical linear regressions controlling for age, body mass index, sex, annual household income, and IQ were utilized to assess independent and interactive contributions of dietary and metabolite data on Switch task outcomes. Results Dietary intake of lutein + zeaxanthin and choline were correlated with serum lutein concentrations (r = 0.42, P < 0.01, r = 0.35, P < 0.01) but not with plasma choline metabolites nor MPOD. Higher intakes of lutein + zeaxanthin and choline were associated interactively, but not independently, with faster reaction time (RT; β = −0.29, P = 0.01). Plasma phosphatidylcholine (PC) concentrations were associated with accuracy in Switch trials (β = 0.28, P = 0.01), while no other biomarkers were associated with cognitive outcomes. Dietary intake and biomarker data were not related to the N2 nor P3 ERP components. Conclusions Individuals with greater intake of lutein + zeaxanthin and choline exhibited faster RT during a cognitive flexibility task. Circulating PC was associated with higher response accuracy. These benefits were evident without differences in the N2 or P3 components, suggesting alternative neural benefits of xanthophyll and choline consumption on cognitive function. Funding Sources Funds were provided by the Hass Avocado Board, the Department of Kinesiology and Community Health at the University of Illinois, and the USDA National Institute of Food and Agriculture, Hatch project 1,009,249.

Educational Kinesiology is a movement-based program designed to enhance academic performance and may also influence performance of motor skills. The purpose of this study was to determine whether the Educational Kinesiology techniques of repatterning and/or integration movements affected static balance of 60 learning disabled students, ranging in age from 7 to 11 yr. Subjects were matched on age and sex and assigned to one of three groups: control, movement, or repatterned. Children in the repatterned group received a 10-min. individual session of combined arm and leg movements coordinated with eye-placements prior to the start of the 6-wk. program. Both treatment groups then participated in a movement program for 5 min. twice a day, 5 days a week for 6 wk. The control group received no exposure to these special techniques. Static balance was pretested and posttested in each group using the Modified Stork Stand test. A one-way analysis of variance indicated a significant difference between groups. A Scheffé post hoc test showed that the repatterned group improved more than the movement group, who in turn improved more than the control group.

Purpose Conceptual physical education (CPE) classes have been widely offered to promote a healthy lifestyle in higher education settings. The purpose of this paper is to examine the effects of a CPE course on health-related fitness (HRF) levels among college freshmen. Design/methodology/approach A pre- and post-test research design was used. In total, 50 freshmen in a US university were enrolled in a 13-week CPE course. Their HRF levels were assessed by the Fitnessgram at the beginning and the end of the course. Findings Students significantly enhanced their aerobic capacity, upper-body muscle strength and endurance, abdominal muscle strength and endurance, and decreased body fat percentage. No significant improvement in flexibility was found among the total sample. However, non-kinesiology students significantly enhanced their flexibility while the opposite trend was found among kinesiology students. Female students reduced more body fat percentage, while male students increased their aerobic capacity more rapidly than their female counterparts. Practical implications The CPE course could yield significant improvement in HRF among freshmen, regardless of sex or major. Universities may consider offering CPE courses for all students and mandate such courses as a degree requirement. Originality/value This empirical study investigated HRF level changes that occurred after a CPE course intervention among college freshmen. Sex and major difference in HRF changes were revealed. The interventions included in the CPE course could help improve freshmen's HRF levels in future intervention programs in a similar setting.

Master of Science<br>Department of Kinesiology<br>Craig A. Harms<br>Expiratory flow limitation (EFL) during exercise can limit exercise tolerance. We have recently reported a high prevalence of EFL independent of sex in prepubescent children (Swain et al. 2010) that greatly exceeds that reported in adults. It is unknown how maturation and growth from pre- to post-puberty affects pulmonary function, specifically EFL, during exercise. The purpose of this longitudinal study was to investigate the changes in cardiopulmonary function from pre- to post-puberty in boys and girls. We hypothesized that EFL prevalence would decrease from pre- to post-puberty (with boys exhibiting a greater decrease than girls) and that the decrement could be explained by an increase in pulmonary function and a decrease in VE/VCO2. Twenty-one children (ages 12-16 yrs; 11 boys, 10 girls) were recruited from 40 prepubescent children who completed testing in our laboratory ~5 years ago. Subjects completed pulmonary function tests before and after an incremental exercise test to exhaustion (VO2max) on a cycle ergometer. EFL was determined using the percent tidal volume (VT) overlap method. Nineteen of the 21 subjects (10 boys, 9 girls; 90%) exhibited EFL pre-puberty, while only 7 of the 21 subjects (5 boys, 2 girls; 33%) exhibited EFL post-puberty. Of the subjects who experienced EFL post-puberty, all had experienced EFL pre-puberty. Boys had a significantly greater vital capacity (VC) than girls both pre- (~15%) and post-puberty (B: 4.73 ± 0.53; G: 3.80 ± 0.29 L). Maximal aerobic capacity (VO2max) significantly increased (~110% in girls and ~120% in boys) from pre- to post-puberty and was greater (p<0.05) in boys post-puberty (B: 2.76 ± 0.43; G: 1.94 ± 0.35 L/min). VE/VCO2 also significantly decreased (~13%) in both boys and girls. Post-puberty subjects regulated tidal breathing at higher lung volumes (greater ERV/FVC and lower IRV/FVC) during exercise compared to pre-puberty. None of the subjects experienced significant arterial desaturation pre-puberty or post-puberty. Our findings suggest that the prevalence of EFL declines as children mature from pre- to post-puberty, likely due to increases in lung size, decreases in VE/VCO2, and/or changes in breathing mechanics that are greater than increases in maximal ventilation that occur with increased pulmonary gas exchange.

Background: To determine the role of muscle mass in sex-dependent differences in power output during flywheel resistance training (FRT). Methods: Twenty recreationally active (≥ 2 resistance exercise bouts per week), subjects (10 M, 10 F) completed 2 bouts of resistance exercise using a flywheel resistance training (FRT) device (Exxentric kbox 4 Pro) separated by at least one week. Each session consisted of 3 sets of 4 exercises (squat, bent-over row, Romanian deadlift, and biceps curl) with varying moments of inertia (0.050, 0.075, and 0.100 kg/m2, respectively) in random order. Each set consisted of 5 maximal effort repetitions with 3-minute recovery between sets. Average power, peak concentric and peak eccentric power were recorded and normalized to whole-body skeletal muscle mass (as calculated from bioelectrical impedence analysis). Additionally, linear regression analysis was used to determine the association between muscle mass and highest power output observed among all three inertial loads. Results: Absolute average, peak concentric and peak eccentric power for all lifts was significantly higher for males compared to females except for peak eccentric power for biceps curl which showed no significant difference. After normalizing to skeletal muscle mass, power output remained significantly higher for men in Row average power and peak concentric power as well as average power for biceps curl. A significant main effect of inertial load was noted for both absolute and relative power output for all exercises except for squat average power and peak concentric power. Regression analysis revealed that power output increases linearly with skeletal muscle mass (R2 = 0.37-0.77). Conclusions: Differences in power output between sexes during resistance exercise can largely be explained by differences in muscle mass. Indeed, muscle mass accounts for approximately 37-77% of the variance in power output during FRT depending on the exercise. Increasing inertial load tends to decrease power output during FRT.

Females suffer anterior cruciate ligament (ACL) injuries at a 2 to 10-fold greater rate compared to male athletes participating in similar sports. Altered movement patterns and inadequate knee stiffness are two interrelated factors that may increase ACL injury risk. Onset of these neuromuscular risk factors may coincide with the rapid adolescent growth that results in the divergence of a multitude of neuromuscular parameters between sexes. The overall purpose of this dissertation was to determine if neuromuscular ACL injury risk factors in female athletes increase following rapid growth and development compared to males. Male and female athletes were tested with three-dimensional motion analysis techniques during a drop vertical jump over two consecutive years to determine if ACL injury risk factors increased. Pubertal females showed a significant longitudinal increase in knee abduction angle compared to post-pubertal females and both male groups. The increase in knee abduction angle appeared to remain consistent, as the post pubertal female cohort had greater overall knee abduction compared to post-pubertal males. Similar results were found with a greater magnitude of knee abduction moment in post-pubertal females compared to males. Males and females increased ankle, knee and hip active stiffness from the first to second year of testing. Ankle and hip stiffness were increased significantly more in the pubertal group compared to post-pubertal. Sex and maturational group differences were found in hip and ankle joint stiffness. Post-pubertal males had significantly greater hip stiffness than the other groups (even when normalized to body mass). This indicates that post-pubertal males utilized a different neuromuscular strategy during landing. Males had a significantly greater increase from year to year in vertical jump height compared to females. Vertical jump height is often related to a measure of whole body power and indicates that males had a significant neuromuscular spurt compared to females. Early puberty appears to be a critical phase related to the divergence of increased ACL injury risk factors. Injury prevention programs that focus on neuromuscular training may be beneficial to help address the development of ACL injury risk factors that occur in female athletes during maturation.

The purpose of this study was to determine if there are sex differences in induced heat shock protein 70 (Hsp70) expression in human skeletal muscle under basal conditions and in response to intense intermittent isometric exercise. Furthermore, this study examined potential sex differences in muscle fatigability and sarcoplasmic reticulum (SR) function for up to 9 days following the bout of exercise. In total, 6 male (20 ± 0.5 years of age, 70.88 ± 10.25 kg, mean ± SE) and 6 female participants (19 ± 0.25 years of age, 58.02 ± 5.82 kg, mean ± SE) were recruited for this study to do one legged intermittent isometric exercise with a 50% duty cycle (5 sec contraction: 5 sec relaxation) at 60% of their maximal voluntary contraction (MVC) for 30 minutes. Muscle biopsies, blood samples and muscle stimulation measurements were taken prior to starting exercise for assessment of baseline values. These same measures were taken immediately POST exercise and at 24(R1), 72(R3), 144(R6) and 216(R9) hours following the exercise. Muscle samples were analyzed for exercise and recovery response of Hsp70, sarco(endo)plasmic reticulum Ca2+ATPase (SERCA)1 and SERCA2 protein content, as well as measurements of maximal Ca2+ ATPase activity and Ca2+ uptake. Blood samples were also analyzed for serum estrogen and creatine kinase concentrations. The results from this study show that there are no differences in basal Hsp70 protein content between males and females, and that females have a blunted (no increase up to 9 days post exercise) Hsp70 response following a bout of intense exercise in comparison to males who had a robust response. Immediately following exercise females had smaller decrements in MVC and electrically stimulated force (10 and 100Hz). It was also found that at low frequencies of stimulation (10Hz), females were able to recover at a quicker rate than males. There was no evidence that the decrements in force or the differences in recovery time between males and females were due to alterations in SERCA protein content or function. This thesis is the first study in humans to show that there is sexual dimorphism in the exercise induced Hsp70 response to exercise.

Despite years of research, females continue to have a higher incidence of non-contact ACL injuries. One of the major findings of this research is that males and females perform certain tasks, such as, cutting, landing, and single-leg squatting, differently. In particular, females tend to move the knee into a more valgus position; a motion putting the ACL at risk for injury. Yet the underlying spinal control mechanisms modulating this motion are unknown. Additionally, the mechanisms regulating the ability to rapidly initiate and produce maximal torque are also unknown. Therefore, the purpose was to: 1) determine if the sexes modulate spinal control differently, 2) examine the contributions of spinal control mechanisms to valgus knee motion, and 3) identify contributions of spinal control to the ability to rapidly produce force. The spinal control variables were the first derivative of the Hoffmann (H)-reflex, the first derivative of extrinsic pre-synaptic inhibition (EPI), the first derivative of intrinsic pre-synaptic inhibition (IPI), recurrent inhibition (RI), and V-waves. To assess the neuromuscular system’s ability to rapidly activate, rate of torque development (RTD) and electromechanical delay (EMD) were measured. Lastly, valgus motion was determined by the frontal plane projection angle (FPPA). The results reveal males and females do modulate spinal control differently; specifically males had an increased RTD, which is the slope of the torque-time curve, and increased RI, which is a post-synaptic regulator of torque output. However, the spinal control mechanisms did not significantly contribute to FPPA at the knee. EMD which is the time lag from muscle activity to torque production was significantly predicted by the spinal control mechanisms. Specifically, EPI, a modulator of afferent inflow from peripheral and descending sources, IPI, a regulator of Ia afferent inflow, and sex significantly contributed to EMD. Lastly, the spinal control mechanisms significantly contributed to RTD. Specifically, IPI, sex, and V-waves, a measure of supraspinal drive, all significantly contributed to RTD.<br>Graduation date: 2009

abstract: It has been repeatedly shown that females have lower stability and increased risk of ankle injury when compared to males participating in similar sports activities (e.g., basketball and soccer), yet sex differences in neuromuscular control of the ankle, including the modulation of ankle stiffness, and their contribution to stability remain unknown. To identify sex differences in human ankle stiffness, this study quantified 2- dimensional (2D) ankle stiffness in 20 young, healthy men and 20 young, healthy women during upright standing over a range of tasks, specifically, ankle muscle co-contraction tasks (4 levels up to 20% maximum voluntary co-contraction of ankle muscles), weight-bearing tasks (4 levels up to 90% of body weight), and ankle torque generation tasks accomplished by maintaining offset center-of-pressure (5 levels up to +6 cm to the center-of-pressure during quiet standing). A dual-axial robotic platform, capable of perturbing the ankle in both the sagittal and frontal planes and measuring the corresponding ankle torques, was used to reliably quantify the 2D ankle stiffness during upright standing. In all task conditions and in both planes of ankle motion, ankle stiffness in males was consistently greater than that in females. Among all 26 experimental conditions, all but 2 conditions in the frontal plane showed statistically significant sex differences. Further analysis on the normalized ankle stiffness scaled by weight times height suggests that while sex differences in ankle stiffness in the sagittal plane could be explained by sex differences in anthropometric factors as well as neuromuscular factors, the differences in the frontal plane could be mostly explained by anthropometric factors. This study also demonstrates that the sex differences in the sagittal plane were significantly higher as compared to those in the frontal plane. The results indicate that females have lower ankle stiffness during upright standing thereby providing the neuromuscular basis for further investigations on the correlation of ankle stiffness and the higher risk of ankle injury in females.<br>Dissertation/Thesis<br>Masters Thesis Biomedical Engineering 2020

Abstract Human’s motion and its mechanisms had become interesting in the last years, where the medecine’s field search for rehabilitation methods for handicapped persons. Other fields, like sport sciences, professional or military world, search to distinguish profiles and ways to train them with specific purposes. Besides, recent findings in neuroscience try to describe these mechanisms from an organic point of view. Until now, different researchs had given a model about control motor that describes how the union between the senses’s information allows adaptable movements. One of this sense is the proprioception, the sense which has a quite big factor in the orientation and position of the body, its members and joints. For this reason, research for new strategies to explore proprioception and improve the theories of human motion could be done by three different vias. At first, the sense is analysed in a case-study where three groups of persons are compared in a controlled enviroment with three experimental tasks. The subjects belong to each group by the kind of sport they do: sedentary, normal sportsmen (e.g. athletics, swimming) and martial sportmen (e.g. karate, judo). They are compared thinking about the following hypothesis: “Martial Sportmen have a better proprioception than of the other groups’s subjects: It could be due to the type of exercises they do in their sports as empirically, a contact sportsman shows significantly superior motor skills to the members of the other two groups. The second via are records from encephalogram (EEG) while the experimental tasks are doing. These records are analised a posteriori with a set of processing algorithms to extract characteristics about brain’s activity of the proprioception and motion control. 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