Hamstring rate of torque development is more affected than maximal voluntary contraction after a professional soccer match

Tidsskriftartikel - 2019

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Match-induced fatigue of knee muscle strength and agonist-antagonist strength-ratios may affect both performance and risk of injury in soccer players. Once explosive tasks are imperative in soccer as well as hamstring strain injuries occur during high-velocity moments, rapid force capacity of this muscle group is especially important. This study evaluated the effect of match-induced fatigue on knee muscle strength and strength-ratio parameters after a single professional soccer match. Male professional soccer players (n = 16; 24.2 ± 3.9 years) were tested before and after a soccer match (56.2 ± 22.6 minutes of playing) for knee flexors (hamstring) and extensors (quadriceps) isometric peak torque (MVC) and rate of torque development (RTD) - as well as the hamstring-to-quadriceps ratio (H:Q) - at 30° of knee flexion. Knee injuries often occur at this joint angle, which is common in sprinting, pivoting, sidecutting, and jumping. Match-induced fatigue caused a left shift in the knee extensors torque-time curve with no significant change in both early (i.e. 0 to 50 ms) and late (i.e. 0 to 200 ms) RTD, and a right shift in the knee flexors torque-time curve with a decrease in early RTD (∼16%, P = 0.029) and late RTD (∼11%, P = 0.011). Knee extensors and knee flexors peak torque remained unchanged (P > 0.05). Early RTD H:Q decreased by∼24% (P = 0.027), while late RTD H:Q and MVC H:Q remained unchanged (P > 0.05). In conclusion, match-induced fatigue impaired the ability to rapidly produce force at an angle where injuries are most susceptible to occur. Important information is missed if only the traditional H:Q is considered.

Reference

Grazioli R, Lopez P, Andersen LL, Machado CLF, Pinto MD, Cadore EL, Pinto RS. Hamstring rate of torque development is more affected than maximal voluntary contraction after a professional soccer match. European Journal of Sport Science 2019;19(10):1336-1341.
doi: 10.1080/17461391.2019.1620863

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