Academic literature on the topic 'Maximal voluntary isometric contraction (MVIC'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Maximal voluntary isometric contraction (MVIC.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Maximal voluntary isometric contraction (MVIC"
1
Ettinger, Lucas, Jason Weiss, Matthew Shapiro, and Andrew Karduna. "Normalization to Maximal Voluntary Contraction is Influenced by Subacromial Pain." Journal of Applied Biomechanics 32, no. 5 (2016): 433–40. http://dx.doi.org/10.1123/jab.2015-0185.
Full textAbstract:
In this study, we aimed to determine if electromyography (EMG) normalization to maximal voluntary isometric contractions (MVIC) was influenced by subacromial pain in patients with subacromial impingement syndrome. Patients performed MVICs in unique testing positions for each shoulder muscle tested before and after subacromial injection of local anesthetic. In addition to collection of MVIC data, EMG data during an arm elevation task were recorded before and after injection. From a visual analog pain scale, patients had a 64% decrease in pain following the injection. Significant increases in MVICs were noted in 4 of the 7 shoulder muscles tested: anterior, middle and posterior deltoid, and lower trapezius. No significant differences were noticed for the upper trapezius, latissimus dorsi, or serratus anterior. MVIC condition (pre and post injection) had a significant influence on EMG normalization for the anterior deltoid and lower trapezius muscle. Results indicate that subacromial pain can influence shoulder muscle activity, especially for the deltoid muscles and lower trapezius. In addition, normalization to MVIC in the presence of pain can have unpredictable results. Caution should be taken when normalizing EMG data to MVIC in the presence of pain.
2
Suzuki, Frank Shiguemitsu, Marcelo Martins Kalytczak, Cesar Augusto de Souza Casarin, et al. "PHYSICAL ACTIVITY LEVEL DOES NOT INFLUENCE THE NEUROMUSCULAR FATIGUE IN ADULTS." Revista Brasileira de Medicina do Esporte 22, no. 2 (2016): 97–101. http://dx.doi.org/10.1590/1517-869220162202150282.
Full textAbstract:
Introduction: Fatigue during voluntary muscle contractions is a complex and multifactorial phenomenon associated with central changes and adaptations of the neuromuscular system. Objective: The purpose of this study was to evaluate the fatigue induced by intermittent successive extension of the knee between active and inactive university students. Method: Twenty healthy men (≥18 years), voluntarily participated in this study. To determine the maximum voluntary isometric contraction (MVIC) of the knee extensors muscle group, three sets of isometric contractions of knee extension were performed for five seconds with five minutes of rest between sets. The fatigue protocol consisted of 10 sets of 10 maximal concentric contractions of the extensor on the right knee, performed at 75% of MVIC with an interval of 45". Results: Significant reductions were observed (p<0.01), both in isometric strength (-34±4%) and the dynamic strength (-40 ± 3%). In addition, the slope of relationship strength x repetition was -0.79±0.07 Nm/repetitions and the magnitude of the effect reached -8.90. Conclusion: The protocol was useful to induce peripheral fatigue, although muscle strength is greater in the active group. In both isometric and dynamic action, muscle fatigue did not differ between groups.
3
Singh, Samrudhi, and Mariya Jiandani. "Myocardial load at 30% and 50% of Maximal Voluntary Isometric Contraction in healthy individuals with Active and Sedentary Lifestyle." International Journal of Sport, Exercise and Health Research 4, no. 1 (2020): 7–11. http://dx.doi.org/10.31254/sportmed.4102.
Full textAbstract:
Background: Activities of daily living consists of isometric & isotonic contraction. Isometric contraction is a static contraction that exerts pressure overload on the heart. Studies have been carried out demonstrating hemodynamic effects of isotonic exercises however limited studies are available on myocardial load with isometric exercises. Aims and Objectives: To study the myocardial load at 30% and 50% of maximal voluntary isometric contraction (MVIC) in individuals with active and sedentary lifestyle. Study design and setting: Observational cross-sectional study was carried out in a tertiary care hospital. Materials and Methods: 140 healthy subjects (70 each in active & sedentary group) were recruited for the study. Baseline demographics of both groups were comparable. Hemodynamic parameters were taken at rest. Subject performed 30% and 50% MVIC and hemodynamic parameters were recorded during and post contraction. Statistical Analysis: Paired t test was used to compare the myocardial load between 30% and 50% MVIC in both groups. Repeated measures ANOVA was used to compare the myocardial load between active & sedentary groups at 30% and 50% MVIC. Result: There was a statistically significant difference in heart rate, systolic blood pressure &rate pressure product between 30% and 50% in active as well as sedentary groups. There was statistically no significant difference in heart rate, systolic blood pressure & rate pressure product between active & sedentary groups at 30% and 50% MVIC. Conclusion: The myocardial load during activities at submaximal intensities (<50%) is within the physiological limits and can be performed safely in individuals with active and sedentary lifestyle.
4
Holt, Laurence E., Philip D. Campagna, and Thomas W. Pel Ham. "Hemodynamics During a Machine-Aided Flexibility Protocol." Canadian Journal of Applied Physiology 20, no. 4 (1995): 407–16. http://dx.doi.org/10.1139/h95-032.
Full textAbstract:
Heart rates and systolic and diastolic blood pressures of 15 subjects were measured before, during, and after a series of four proprioceptive neuromuscular facilitation (PNF) flexibility exercises. The protocol for the study involved the use of two new machines, one designed to increase flexibility of the erector spinae, the other the hamstrings. Each machine provided constant feedback of isometric force, angular displacements, time of contraction, repetitions, and other exercise variables. Each bout of exercise involved an isometric contraction of the lengthened agonist muscle group (12 sec) followed by a concentric contraction of its antagonist in order to place the body part in a more stretched position. Hemodynamic measurements were determined at both a perceived maximal voluntary isometric contraction (MVIC) and at 50% MVIC. Significant increases in hemodynamic factors were observed when exercise measures were compared to pre- and postexercise (resting) values. Higher values, though not significantly so, were found at MVIC than at 50% MVIC on both machines. All values were well within the guidelines of the American College of Sports Medicine. Key words: blood pressure, heart rate, exercise prescription, isometric contraction
5
Schaub, Peter A., and Teddy W. Worrell. "EMG Activity of Six Muscles and VMO:VL Ratio Determination during a Maximal Squat Exercise." Journal of Sport Rehabilitation 4, no. 3 (1995): 195–202. http://dx.doi.org/10.1123/jsr.4.3.195.
Full textAbstract:
During knee rehabilitation, squats are a commonly used closed kinetic chain exercise. We have been unable to locate data reporting electromyographic (EMG) activity of lower extremity musculature during maximal effort squats and the contribution of gastrocnemius and gluteus maximus muscles. Therefore, the purposes of this study were (a) to quantify EMG activity of selected lower extremity muscles during a maximal isometric squat and during a maximal voluntary isometric contraction (MVIC), and (b) to determine ratios between the vastus medialis oblique (VMO) and vastus lateralis (VL) during maximal isometric squat and MVIC testing. Twenty-three subjects participated in a single testing session. Results are as follows: intraclass correlations for MVIC testing and squat testing ranged from .60 to .80 and .70 to .90, respectively. Percentage MVIC during the squat was as follows: rectus femoris 40 ± 30%, VMO 90 ± 70%, VL 70 ±40%, hamstrings 10 ± 10%, gluteus maximus 20 ± 10%, and gastrocnemius 30 ± 20%. No statistical difference existed in VMO:VL ratios during MVIC or squat testing. We conclude that large variations in muscle recruitment patterns occur between individuals during isometric squats.
6
Gage, Matthew, Kevin Phillips, Byungjoo Noh, and Tejin Yoon. "Choline-Based Multi-Ingredient Supplementation Can Improve Explosive Strength during a Fatiguing Task." International Journal of Environmental Research and Public Health 18, no. 21 (2021): 11400. http://dx.doi.org/10.3390/ijerph182111400.
Full textAbstract:
Various choline-based multi-ingredient supplementations (CMS) have been suggested in the current market, but the research is limited. The purpose of this study was to investigate the acute effect of a CMS on physical performance. Fourteen male college football players (20.4 ± 1.0 years) participated in a randomized double-blind crossover experiment separated by 7 days. Subjects were given a CMS or a placebo 60 min before physical performance testing measures, including maximum vertical jumps, maximum voluntary isometric contractions (MVIC), maximal voluntary concentric contractions (MVCC), and fatiguing contractions. Four MVICs and seven sets of two MVCCs at various loads (1 N·m to 60% MVIC torque) were performed with the knee extensor muscles while seated on a dynamometer before and after the fatiguing tasks. During the fatiguing tasks, 120 MVCCs (4 sets × 30 reps) were performed with a load equivalent to 20% MVIC. Twitch interpolation technique was used to assess muscle contractile properties and voluntary activation. No significant differences were seen at baseline between sessions for all testing measures including vertical jump height, strength, power, muscle contractile properties and voluntary activation. Rate of torque development and impulse was higher in supplemental session compared to control session throughout the fatiguing contractions (p = 0.018, p < 0.001, respectively). Acute CMS can improve explosive strength by delaying the onset of fatigue.
7
Aggarwal, Arun. "Handgrip Maximal Voluntary Isometric Contraction Does Not Correlate with Thenar Motor Unit Number Estimation." Neurology Research International 2012 (2012): 1–5. http://dx.doi.org/10.1155/2012/187947.
Full textAbstract:
In slowly progressive conditions, such as motor neurone disease (MND), 50–80% of motor units may be lost before weakness becomes clinically apparent. Despite this, maximal voluntary isometric contraction (MVIC) has been reported as a clinically useful, reliable, and reproducible measure for monitoring disease progression in MND. We performed a study on a group of asymptomatic subjects that showed a lack of correlation between isometric grip strength and thenar MUNE. Motor unit number estimation (MUNE) estimates the number of functioning lower motor neurones innervating a muscle or a group of muscles. We used the statistical electrophysiological technique of MUNE to estimate the number of motor units in thenar group of muscles in 69 subjects: 19 asymptomatic Cu, Zn superoxide dismutase 1 (SOD 1) mutation carriers, 34 family controls, and 16 population controls. The Jamar hand dynamometer was used to measure isometric grip strength. This study suggests that MUNE is more sensitive for monitoring disease progression than maximal voluntary isometric contraction (MVIC), as MUNE correlates with the number of functional motor neurones. This supports the observation that patients with substantial chronic denervation can maintain normal muscle twitch tension until 50–80% of motor units are lost and weakness is detectable.
8
Park, Nicole D., Robert D. Maresca, Kimberly I. McKibans, D. Reid Morgan, Timothy S. Allen, and Gordon L. Warren. "Caffeine’s Beneficial Effect on Maximal Voluntary Strength and Activation in Uninjured but Not Injured Muscle." International Journal of Sport Nutrition and Exercise Metabolism 18, no. 6 (2008): 639–52. http://dx.doi.org/10.1123/ijsnem.18.6.639.
Full textAbstract:
The study’s objective was to determine whether orally ingested caffeine could help overcome excitation-contraction-coupling failure, which has been suggested to explain part of the strength loss associated with eccentric-contraction-induced muscle injury. A sample of 13 college students (4 men and 9 women) was used in a double-blind, repeated-measures experimental design. Each participant performed 2 experimental trials, 1 with each leg, with each trial lasting 4 consecutive days. On a given day, each participant was randomly assigned to ingest a capsule containing 6 mg/kg of either caffeine or flour (placebo). On the day of and the first 2 days after a bout of 50 injurious eccentric contractions done by the knee extensors, the interpolated-twitch technique was used to assess electrically evoked strength, maximal voluntary isometric contraction (MVIC) strength, and percent muscle activation during MVIC both before and after capsule ingestion. These variables were also measured before and after capsule ingestion the day before the eccentric-contraction bout—when the muscle was uninjured. In injured muscle, caffeine had no effect on any variable. In uninjured muscle, caffeine also had no effect on electrically evoked strength but increased MVIC strength by 10.4% compared with placebo (p = .00002), and this was attributed to an increase in muscle activation (6.2%; p = .01). In conclusion, the data provide no evidence that caffeine ingestion can help overcome excitation-contraction-coupling failure, if it exists, in injured human muscle. The data do indicate that caffeine ingestion can increase MVIC strength and activation in uninjured muscle but not in injured muscle.
9
Kaszyński, Jakub, Paweł Bąkowski, Paweł Cisowski, Bartosz Kiedrowski, and Tomasz Piontek. "DETERMINING MINIMAL DETECTABLE CHANGE AND TEST-RETEST RELIABILITY OF TIMED UP AND GO TEST, 5 TIMES SIT TO STAND TEST, 10 METERS WALK TEST, AND MAXIMAL VOLUNTARY ISOMETRIC CONTRACTION OF KNEE EXTENSORS AND FLEXORS IN PATIENTS WITH KNEE OSTEOARTHRITIS." Issues of Rehabilitation, Orthopaedics, Neurophysiology and Sport Promotion – IRONS 38 (March 2022): 7–17. http://dx.doi.org/10.19271/irons-000160-2022-38.
Full textAbstract:
Introduction Timed Up and Go test (TUG), 5 Times Sit to Stand test (STS) and 10-meter Walk test (WT) are often used in clinical trials. Aim The purpose of this study is to determine the test-retest reliability of TUG, STS, 10WT and maximal voluntary isometric contraction (MVIC) of the knee extensors and flexors and to determine a minimal detectable change (MDC) for those tests in a population of patients with knee osteoarthritis (OA) who will undergo conservative treatment. Material and methods Sixty-one patients with symptomatic knee OA were included in this study. The testing protocol consisted of TUG, STS, 10WT and maximal voluntary isometric contraction (MVIC) of knee extensors and flexors. Participants were tested twice. Results TUG, STS, 10WT and MVIC and standardised MVIC of knee extensors and flexors showed an excellent test-retest reliability. Standard Error of Measurement and MDC95 for TUG was 0.37s and 1.01s, respectively; for STS was 0.69s and 1.91s, respectively; for 10WT was 0.23s and 0.65s, respectively; for MVIC of extensors was 19.66N and 54.5N, respectively; for MVIC of flexors was 9.73N and 26.96N, respectively; for standardised MVIC of extensors was 0.22 and 0.62, respectively; for standardised MVIC of flexors was 0.11 and 0.31, respectively. Conclusions TUG, STS, 10WT, and MVIC measurements have excellent test-retest reliability in mild to moderate knee OA patients. Changes greater than 1.01s for TUG, 1.91s for STS, 0.65s for 10WT, 0.62 for standardised MVIC of knee extensors and 0.31 for standardised MVIC of knee flexors may be used as clinically significant.
10
Vitry, Florian, Alain Martin, and Maria Papaiordanidou. "Torque gains and neural adaptations following low-intensity motor nerve electrical stimulation training." Journal of Applied Physiology 127, no. 5 (2019): 1469–77. http://dx.doi.org/10.1152/japplphysiol.00513.2019.
Full textAbstract:
The purpose of the study was to assess neural adaptations of the plantar-flexors induced by an electrical stimulation training applied over the motor nerve at low intensity using two different stimulation frequencies. Thirty subjects were randomly assigned into 3 groups: 20 Hz, 100 Hz, and control group. The training consisted of 15 sessions of 25 stimulation trains applied over the tibial nerve and delivered at an intensity evoking 10% maximal voluntary isometric contraction (MVIC). Before and after training, MVIC was assessed and neural adaptations were evaluated by the voluntary activation level (VAL) and the V-wave (normalized by the superimposed muscle compound action potential, V/MSUP). H-reflex and motor-evoked potential (MEP) recorded during MVIC were studied to assess spinal and corticospinal excitabilities [i.e., maximal H-reflex during maximal voluntary isometric contraction (HSUP)/MSUP and maximal motor-evoked potential during maximal voluntary isometric contraction (MEPSUP)/MSUP]. MVIC significantly increased after training only for the two training groups ( P = 0.017). This increase was accompanied by a significant increase of VAL only for these groups ( P = 0.014), whereas statistical analysis revealed a time effect for V/MSUP ( P = 0.022). HSUP/MSUP and MEPSUP/MSUP were significantly increased at post conditions only for the 100 Hz group ( P = 0.021 and P = 0.029). Results show that low-intensity electrical stimulation training applied over the motor nerve can induce torque gains, accompanied by neural adaptations. Stimulation frequency differentially affected spinal and corticospinal excitabilities, indicating that neural adaptations could have a supraspinal origin for the 20-Hz protocol, whereas spinal and supraspinal mechanisms were implicated in the torque increases after the 100-Hz training. NEW & NOTEWORTHY This study brings new insights into the neurophysiological mechanisms responsible for torque gains after electrical stimulation training using wide pulse duration and low stimulation intensity applied over the motor nerve. Stimulation frequency had a distinct impact on spinal and/or supraspinal origins of the observed neural adaptations. The use of the aforementioned stimulation parameters in rehabilitation settings can be proved beneficial in terms of strength gains while avoiding any serious discomfort because of stimulation.
Dissertations / Theses on the topic "Maximal voluntary isometric contraction (MVIC"
1
Derington, John A. "The Acute Effects of Patterned Electrical Neuromuscular Stimulation on Quadriceps Torque Production and Motor Unit Recruitment." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4087.
Full textAbstract:
Electric muscle stimulation (EMS) has been widely used in the rehabilitation of musculoskeletal injuries. Patterned electrical neuromuscular stimulation (PENS), a specific form of EMS, has been developed to better educate muscles to contract properly. The physiological efficacy of PENS has not been quantifiably identified. OBJECTIVES: The aim of this study is to determine the acute effect of one PENS training session (3 sets of 10 1-sec repetitions) on maximal isometric knee extensor (MVIC) torque production and surface EMG (sEMG) in healthy nonathlete college students. DESIGN: A randomized repeated-measures design was used in this study. METHODS: Twenty-two male college students participated in the study. All participants completed two training sessions, one with PENS and one without, in a randomized crossover design. RESULTS: One bout of PENS training significantly increased MVIC (3.1% ± 1.7%, p = 0.03) which was greater than the change in MVIC of the control group (p = 0.03). Control training did not alter MVIC but resulted in significant decrease in average sEMG amplitude (-7.8% ± 1.6%, p ≤ 0.01) and peak sEMG amplitude (-10.4% ± 2.7%, p ≤ 0.01). These reductions in sEMG following control training were significantly different from the PENS group (p = 0.03 and p ≤ 0.01). CONCLUSIONS: The findings suggest that strength training in conjunction with PENS can enhance torque production after just one bout of training. The increase in torque with no change in sEMG amplitude can be explained by increased motor unit synchronization or decreased cocontraction of antagonist muscles.
2
Kan, Benjamin. "Effect of transcranial direct current stimulation (tDCS) on maximal voluntary isometric strength and endurance of the elbow flexors." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2011. https://ro.ecu.edu.au/theses/375.
Full textAbstract:
The present study investigated the effects of transcranial direct current stimulation (tDCS) on maximal voluntary contraction strength (MVC) and the time to failure (TTF) of an isometric muscle endurance test of the elbow flexors. Prior to the main study, the test-retest reliability of MVC and TTF measures was investigated using 10 men (33.2 ± 9.4 y) for the measurements separated by 60 min (within-day) and one week (between-day). Coefficient of variation (CV), Intraclass correlation (ICC, R), a paired t-test and the Bland-Altman plots revealed that TTF at 30% MVC task was reliable, and was able to detect a possible effect of tDCS on TTF, if the magnitude of effect was greater than 11%. Based on the reliability study results, it was hypothesised that tDCS would increase TTF from the first test to the second test separated by 60 min, when a tDCS treatment was administered immediately before the second test. Fifteen men (27.7 ± 8.4 y) were tested for MVC and TTF at 30%-MVC before and immediately after tDCS or sham intervention (10 min) in three separate sessions. In two sessions direct current (2 mA) was delivered through saline-soaked sponge electrodes, with the anode placed on the scalp overlying the right motor cortical representation of the left arm and the cathode secured over the right shoulder. One session was a sham intervention (current delivery for the first 30s). The order of the intervention sessions was randomised and counterbalanced amongst the subjects and subjects who were blinded to intervention type. Changes in MVC strength and TTF from pre to post intervention were compared between the interventions by a two-way repeated measures ANOVA. No significant differences were evident for the two tDCS sessions. MVC strength (baseline: 66.0 ± 11.4 Nm) decreased by 5.9 ± 4.2 % (P
3
Fry, Adam. "A neurophysiological examination of voluntary isometric contractions : modulations in sensorimotor oscillatory dynamics with contraction force and physical fatigue, and peripheral contributions to maximal force production." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/20392.
Full textAbstract:
Human motor control is a complex process involving both central and peripheral components of the nervous system. Type Ia afferent input contributes to both motor unit recruitment and firing frequency, however, whether maximal force production is dependent on this input is unclear. Therefore, chapter 2 examined maximal and explosive force production of the knee extensors following prolonged infrapatellar tendon vibration; designed to attenuate the efficacy of the homonymous Ia afferent-α-motoneuron pathway. Despite a marked decrease in H-reflex amplitude, indicating an attenuated efficacy of the Ia afferent-α-motoneuron pathway, both maximal and explosive force production were unaffected after vibration. This suggested that maximal and explosive isometric quadriceps force production was not dependent upon Ia afferent input to the homonymous motor unit pool. Voluntary movements are linked with various modulations in ongoing neural oscillations within the supraspinal sensorimotor system. Despite considerable interest in the oscillatory responses to movements per se, the influence of the motor parameters that define these movements is poorly understood. Subsequently, chapters 3 and 4 investigated how the motor parameters of voluntary contractions modulated the oscillatory amplitude. Chapter 3 recorded electroencephalography from the leg area of the primary sensorimotor cortex in order to investigate the oscillatory responses to isometric unilateral contractions of the knee-extensors at four torque levels (15, 30, 45 and 60% max.). An increase in movement-related gamma (30-50 Hz) activity was observed with increments in knee-extension torque, whereas oscillatory power within the delta (0.5-3 Hz), theta (3-7 Hz), alpha (7-13 Hz) and beta (13-30 Hz) bands were unaffected. Chapter 4 examined the link between the motor parameters of voluntary contraction and modulations in beta (15-30 Hz) oscillations; specifically, movement-related beta decrease (MRBD) and post-movement beta rebound (PMBR). Magnetoencephalography (MEG) was recorded during isometric ramp and constant-force wrist-flexor contractions at distinct rates of force development (10.4, 28.9 and 86.7% max./s) and force output (5, 15, 35 and 60%max.), respectively. MRBD was unaffected by RFD or force output, whereas systematic modulation of PMBR by both contraction force and RFD was identified for the first time. Specifically, increments in isometric contraction force increased PMBR amplitude, and increments in RFD increased PMBR amplitude but decreased PMBR duration. Physical fatigue arises not only from peripheral processes within the active skeletal muscles but also from supraspinal mechanisms within the brain. However, exactly how cortical activity is modulated during fatigue has received a paucity of attention. Chapter 5 investigated whether oscillatory activity within the primary sensorimotor cortex was modulated when contractions were performed in a state of physical fatigue. MEG was recorded during submaximal isometric contractions of the wrist-flexors performed both before and after a fatiguing series of isometric wrist-flexions or a time matched control intervention. Physical fatigue offset the attenuation in MRBD observed during the control trial, whereas PMBR was increased when submaximal contractions were performed in a fatigued state.
4
Aldayel, Abdulaziz A. "Comparison of acute physiological effects between alternating current and pulsed current electrical muscle stimulation." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2010. https://ro.ecu.edu.au/theses/131.
Full textAbstract:
Electrical muscle stimulation (EMS) is widely used in rehabilitation and sport training, and alternating current and pulsed current EMS are commonly used. However, no systematic comparison between alternating and pulsed current EMS has been made in the previous studies. The main aim of this research was to compare acute physiological responses between the alternating and pulsed current EMS. The secondary purpose of the research was to investigate further muscle damage induced by EMS-evoked isometric contractions. Three experimental studies were conducted in the thesis project together with literature review about EMS.
5
Urso, Rodrigo Poles. "Correlações da aptidão aeróbia e de fatores neuromusculares no desempenho em sprints repetidos em tenistas de diferentes níveis competitivos." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/39/39134/tde-17042015-142918/.
Full textAbstract:
O objetivo desse estudo foi verificar a relação da aptidão aeróbia e de fatores neuromusculares com o desempenho em SR em tenistas com diferentes níveis de jogo. Um grupo de dez tenistas profissionais (GP) e um grupo de dez tenistas amadores (GA) foram submetidos a quatro sessões experimentais, a saber: 1) medidas antropométricas, familiarização com o teste de drop jump (DJ) e com o teste de contração voluntária isométrica máxima (CVIM) para membros inferiores, e um teste progressivo até a exaustão; 2) um teste de DJ e um teste de carga constante para avaliar a cinética on e off do consumo de oxigênio (VO2); 3) um teste de CVIM para membros inferiores, outro teste de carga constante para avaliar a cinética on e off do VO2 e familiarização com o teste de SR; 4) um teste composto por dez SR. O GP apresentou valores significativamente menores para o tempo do melhor sprint (SRmelhor) e para a média dos tempos de todos os sprints (SRmédio) em relação ao GA (p < 0,05). O percentual de aumento do tempo ao longo dos sprints (SR%aumento) do GP não foi significativamente menor em comparação ao GA (p = 0,102), porém a chance dessa variável ser menor para o GP foi considerada \"provável\". Para o GP, a única correlação significativa observada foi entre o SRmédio e o tempo de contato obtido no teste de DJ (r = 0,641, p < 0,05). Em relação ao GA, foram observadas correlações significativas da velocidade pico obtida no teste progressivo até a exaustão com o SRmelhor (r = -0,680, p < 0,05) e SRmédio (r = -0,744, p < 0,05), assim como da amplitude da fase lenta da cinética off do VO2 com o SRmelhor (r = -0,756, p < 0,05) e SRmédio (r = -0,794, p < 0,05). Portanto, esses dados sugerem que tenistas profissionais possuem um melhor desempenho em SR em comparação aos tenistas amadores. Entretanto, não está clara a importância de fatores da aptidão aeróbia e neuromusculares no desempenho dessa atividade<br>The objective of this study was to verify the relationship of aerobic fitness and neuromuscular factors with RS performance in tennis players with different playing level. A group of ten professional (PG) and ten amateur (AG) tennis players were submitted to four experimental sessions, to know: 1) anthropometric measurements, familiarization with the drop jump (DJ) test and the maximal voluntary isometric contraction (MVIC) test for the lower limbs, and a progressive test until exhaustion; 2) a DJ test and a constant load test for on and off oxygen consumption (VO2) kinetics measurement; 3) a MVIC test for the lower limbs, another constant load test for on and off VO2 kinetics measurement, and familiarization with the RS test; 4) a test of ten RS. The PG presented significant lower values for the best sprint time (RSbest) and mean time of all sprints (RSmean) in relation to the AG (p < 0.05). The percentage increase in time over all sprints (RSincrease) of the PG was not significantly lower in comparison to the AG (p = 0.102), however the chance of this variable to be lower for the PG was considered \"probable\". For the PG the only significant correlation observed was between RSmean and the contact time obtained in the DJ test (r = 0.641, p < 0.05). In relation to the AG, significant correlations were observed for the peak speed obtained on the progressive test until exhaustion with the RSbest (r = -0.680, p < 0.05) and RSmean (r = -0.744, p < 0.05), likewise for the amplitude of the slow phase in oxygen uptake off-kinetics with the RSbest (r = -0.756, p < 0.05) and RSmean (r = -0.794, p < 0.05). Thus, these data suggest that professional tennis players have a better performance in RS compared to amateur tennis players. However, it is not clear the importance of aerobic fitness and neuromuscular factors in the performance of this activity
Book chapters on the topic "Maximal voluntary isometric contraction (MVIC"
1
Andreis, F. R., M. A. Favretto, S. Cossul, P. A. Barbetta, and J. L. B. Marques. "Reliability of Maximal Voluntary Isometric Contraction of Ankle Dorsiflexion in Male Subjects." In XXVI Brazilian Congress on Biomedical Engineering. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-2119-1_55.
Full textConference papers on the topic "Maximal voluntary isometric contraction (MVIC"
1
Santos, Wanderson, Vitor Marques, Naiany Silva, Gabriel Siqueira, Raquel Schincaglia, and Carlos Vieira. "HANDGRIP STRENGTH AND ISOMETRIC BILATERAL BENCH PRESS FOR UPPER INTERLIMB STRENGTH ASYMMETRY IN BREAST CANCER WOMEN, WITH OR WITHOUT LYMPHEDEMA." In Abstracts from the Brazilian Breast Cancer Symposium - BBCS 2021. Mastology, 2021. http://dx.doi.org/10.29289/259453942021v31s2058.
Full textAbstract:
Purpose: The aim of this study is to compare upper interlimb strength asymmetry in breast cancer women (BCW), with or without lymphedema, using the handgrip strength test and the isometric bilateral bench press (IBBP) test. Methodology: Twenty-two BCW (age 52.04±8.62 years) were enrolled in a cross-sectional study, with a single-day testing. Ten participants with self-reported breast cancer – related lymphedema (BCRL) and 12 participants without BCRL were evaluated for the interlimb strength asymmetry. The average of the best three of four attempts of the handgrip strength and the IBBP was used to compare the maximal voluntary isometric contraction of each limb. To calculate the interlimb strength asymmetry, we used the following formula as a percentage: the modulus of left minus right side divided by the average between sides, then multiplied by 100. For the statistical analysis, we used the nonparametric Mann–Whitney U test for the handgrip strength and the independent t-test for IBBP. Results: The handgrip strength in BCW with lymphedema (27.62%±15.5%) showed a higher interlimb strength asymmetry than BCW without lymphedema (12.37%±16.29%; p=0.021). However, there was no difference in IBBP (with lymphedema 8.89%±5.81% versus without lymphedema 9.84%±7.98%, p=0.759). Conclusion: BCW with lymphedema might have higher interlimb strength asymmetry assessed by the handgrip strength test compared with BCW without lymphedema, but not in a multi-compound movement such as IBBP. More studies are necessary to confirm our findings.