Dissociation between fatigued power output and traditional peak torque for isokinetic hamstring: Quadriceps ratios in professional soccer players
Document Type
Journal Article
Publication Title
Sport Sciences for Health
Publisher
Springer
School
School of Medical and Health Sciences / Exercise Medicine Research Institute
RAS ID
51931
Funders
CAPES PhD scholarship
CNPQ (Con-selho Nacional de Desenvolvimento Científico e Tecnológico, Brazil) funding
National Health and Medical Research Council (NHMRC)
Centre of Research Excellence (CRE)
Prostate Cancer Survivorship Scholarship
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.
DOI
10.1007/s11332-021-00881-1
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Comments
Veeck, F., Lopez, P., Grazioli, R., Machado, C. L. F., Wilhelm, E. N., Cadore, E. L., & Pinto, R. S. (2022). Dissociation between fatigued power output and traditional peak torque for isokinetic hamstring: Quadriceps ratios in professional soccer players. Sport Sciences for Health, 18, 967-973.
https://doi.org/10.1007/s11332-021-00881-1