Study of the fatigue curve in quadriceps and hamstrings of soccer players during isokinetic endurance testing

Journal of Strength and Conditioning Research
Sébastien Sangnier, Claire Tourny-Chollet

Abstract

Many studies have presented regression models of quadriceps (Q) muscle strength loss with fatigue development. Paradoxically, the hamstrings (H), which are the principal site of muscle injury in soccer players, have received little attention, and no regression model has been established. This study investigated strength loss in the Q and H to establish a regression model using the lowest number of flexions-extensions during isokinetic endurance testing. Twenty-four semiprofessional soccer players performed 50 flexion-extension movements at 180 degrees x s(-1) on an isokinetic dynamometer. The theoretical equations were calculated from the first 10, first 15, first 20, and first 25 contractions for each muscle group by several regression models (linear, quadratic, cubic). The linear model was the best fit to this exercise protocol to describe the strength loss in both muscle groups. The quadratic model was the best fit to predict the changes in the H/Q ratio. This study showed that a regression model can be established for both muscle groups. A minimum of 20 extensions and 15 flexions was needed to establish a linear model that represented strength loss in, respectively, Q and H. A minimum of 25 flexions-extensions was needed wi...Continue Reading

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Citations

Sep 14, 2011·Journal of Strength and Conditioning Research·João R SilvaAntónio N Rebelo
May 26, 2015·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Jessica A MutchlerBonnie L Van Lunen
Nov 9, 2017·Scandinavian Journal of Medicine & Science in Sports·C LordA J Blazevich
Aug 25, 2018·Frontiers in Physiology·Marine AlhammoudChristophe Hautier
Feb 23, 2021·Frontiers in Physiology·Qingshan ZhangChristophe A Hautier

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