Tag: peak torque

Comparison of peak torque and hamstring to quadriceps ratio among professional local and non-local soccer players of the United Arab Emirates

Azal Raed Aboluhom, Esther Esteban-García, Philippe Chomier, Mourad Ghrairi, Mustafa Al Hashimi, Baskaran Chandrasekaran, Kalyana Chakravarthy Bairapareddy

Azal Raed Aboluhom et al.– Comparison of peak torque and hamstring to quadriceps ratio among professional local and non-local soccer players of the United Arab Emirates –  Fizjoterapia Polska 2024; 24(5); 456-461

DOI: https://doi.org/10.56984/8ZG020CW49B

Abstract Introduction. Soccer is a physically demanding sport that is popular around the world. Injury prevention and performance optimization require a thorough understanding of the anthropometric and muscular strength profiles of professional soccer players. It is especially important to understand the muscle strength differences between local and foreign players. This study investigates the peak torque and hamstring-to-quadriceps (H:Q) ratios in local and non-local players in the United Arab Emirates. Methods. This cross-sectional study included 72 local and 56 non-local male professional soccer players in the UAE. The Cybex dynamometer was used to measure isokinetic strength at rotational velocities of 60°/s, 120°/s, and 180°/s. Anthropometric data such as height, weight, and body mass index (BMI) were collected. SPSS statistics version 27.0 was used for statistical analysis. Descriptive statistics summarized demographics, and a mixed-factorial ANOVA was used to investigate the effects of velocity, body side, and player category. Non-parametric and peak torque-demographic relationships were examined using Spearman rank correlation and Pearson’s correlation. Results. Non-local players had significantly higher height, weight, and BMI than local players, implying potential physical advantages. Non-local players exhibited significantly higher peak torque in both quadriceps and hamstrings, resulting in a more balanced H:Q ratio and stronger lower limb muscle strength. Only the left hamstring peak torque showed no statistically significant difference. Height, weight, and BMI were all positively related to muscle strength parameters. Conclusion. Non-local players had significantly higher peak torque in the hamstrings, quadriceps, and H:Q ratio. There was also a strong positive correlation between physical strength measurements and height, implying that taller athletes typically have stronger lower limbs.
Key words soccer players, quadriceps hamstrings ratio, peak torque, isokinetic testing
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Isokinetic measurements – areas of application in physiotherapy

Monika Grygorowicz, Janusz Kubacki, Bogdan Bacik, Krzysztof Gieremek, Anna Polak

Monika Grygorowicz, Janusz Kubacki, Bogdan Bacik, Krzysztof Gieremek, Anna Polak – Isokinetic measurements – areas of application in physiotherapy. Fizjoterapia Polska 2006; 6(3); 238-244

Abstract
The aim of the paper is to present the concept of isokinetic exercises, which was introduced by Hislop and Perrine in 1967 for the first time. No article was found in Polish literature that in consolidated way would discuss mentioned subject. Hence, in support to numerous foreign scientific reports, authors have decided to present the isokinetic exercise to Polish physiotherapists and medical doctors. Thisle et al define isokinetic exercise as dynamic muscle contraction with controlled and holded speed of movement (iso-steady kinetic-movement) performed with specific devices used to that kind of exercises. isokinetic tests are a very precise diagnostic tool that enable an estimation of degree of soft tissues damage. General use of isokinetic strength measurement in clinical practice is based on its obvious validity and reliability in qualification of state and neuromuscular function. Followers of isokinetic tests confirm that it gives possibilities of precise assessment of muscle properties as well as objectification of results. Results enable very precise diagnostic of tested muscles in different biomechanical conditions of performing movement. Tests allow functional muscle assessment through comparison of contralateral, ipsilateral work, with confrontation with corresponding data or with results in control groups. Moreover, graphical presentation of dependence between recorded parameters in every point of tested range of movement is possible. It favors isokinetics in using it to diagnostic in postinjured states of movement system. The areas of application and rules of performance isokinetic testing were described in this article. The main biomechanical parameters which are used in analysis of muscle dynamic properties were discussed additionally.

Key words:
isokinetic exercises, peak torque, biomechanical indicators, dynamic conditions

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Assessment of force-velocity parameters of knee extensors in children with first-degree scoliosis

Małgorzata Stefańska, Dominika Zawadzka

Małgorzata Stefańska, Dominika Zawadzka – Assessment of force-velocity parameters of knee extensors in children with first-degree scoliosis. Fizjoterapia Polska 2006; 6(3); 228-232

Abstract
Background. The objective of this research was to evaluate Force-velocity parameters of knee extensors in children with scoliosis participating and not participating in swimming exercises. Material and methods. 52 children with diagnosed first-degree scoliosis aged from 10 to 11 years participated in this study. Subjects were divided into two groups. A criterion was participation in swimming exercises in the last 6 months. There were no significant statistical differences regarding to age, height and body mass between both group’s children. Any differences in the way of free time spending were found as well. Force-velocity parameters of knee extensors in both groups were determined in isokinetic conditions using a dynamometer device manufactured by Biodex Co. Angular velocities of 60°/s, 180°/s and 240°/s were applied as a research load. Each subject had to extend the lower limb in the knee joint 5 times at each applied velocity. It was necessary for the subject to develop the peak torque in the shortest time possible, in each movement. Results. Values of peak torque, average power and total work performed by knee extensors in each applied angular velocity were results of this research. The research showed higher values of each evaluated parameter for children participating in swimming exercises Conclusions. Exercises in a water environment which has an increased resistance besides a corrective effect have a positive influence on body strength and endurance. Swimming exercises should be an important part of physiotherapy for children with posture defects.

Key words:
isokinetics test, peak torque, average power, total work of muscles, body movement activity

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