Dissociation between fatigued power output and traditional peak torque for isokinetic hamstring:quadriceps ratios in professional soccer players

Veeck, Filipe, Lopez, Pedro, Grazioli, Rafael, Machado, Carlos Leonardo Figueiredo, Wilhelm, Eurico N., Cadore, Eduardo Lusa and Pinto, Ronei Silveira (2022) Dissociation between fatigued power output and traditional peak torque for isokinetic hamstring:quadriceps ratios in professional soccer players. Sport Sciences for Health, 18 (3). pp. 967-973. ISSN 1824-7490

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Abstract

Background: Muscle strength imbalance assessment (e.g., hamstring-to-quadriceps ratio, H:Q) using traditional peak torque isokinetic measurements has been shown to be a weak risk factor predictor of future lower-limb injuries (e.g., hamstring strain and anterior cruciate ligament tear). In soccer, power-related tasks are commonplace and injuries are most likely to occur during fatigued high-velocity actions. Thus, it is reasonable to that calculating H:Q using power output and may serve as an alternative to traditional peak torque-based H:Q. Aims: We aimed to investigate the relationship of isokinetic H:Q calculated from traditional peak torque and power output during non-fatigue and fatigue conditions. Methods: Seventy-nine professional soccer players (25.6 ± 4.9 years old; 78.7 ± 8.1 kg; 179.4 ± 6.7 cm) performed concentric knee extension-flexion contractions at 60°.s−1 (five repetitions) and 300°.s−1 (30 repetitions, fatigue trial). Traditional peak torque H:Q was calculated using the highest torque obtained during five repetitions at 60°.s−1. Power output H:Qnon-fatigued was calculated using the average from the 2nd, 3rd and 4th repetitions, and power output H:Qfatigued was obtained as the average of the power output of the last three repetitions of the fatigue trial. Results: Weak (rs = 0.27) and moderate (rs = 0.49) correlations were found between traditional peak torque and power output H:Qfatigued, and traditional peak torque and power output H:Qnon-fatigued, respectively. Conclusion: The present data suggested that power H:Q differs from traditional H:Q, particularly during fatigue in professional soccer players, which warrants further investigation on the potential use of power output H:Q ratios for injury prediction.

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