Hamstring-to-quadriceps fatigue ratio offers new and different muscle function information than the conventional non-fatigued ratio

Tidsskriftartikel - 2017

Resume

BACKGROUND: Commonly used injury risk prediction tests such as the hamstring-to-quadriceps (H:Q) strength ratio appear to be poor predictors of non-contact injury. However, these tests are typically performed in a non-fatigued state, despite accumulated fatigue being an important risk factor for both hamstring strain (HS) and anterior cruciate ligament (ACL) injuries in professional soccer players PURPOSE: To examine the influence of neuromuscular fatigue on the H:Q strength ratio and the association between fatigued and non-fatigued ratio scores, after the effect of different H:Q calculation methods were compared and contrasted METHODS: Thirty-five professional soccer players performed a 30-repetition isokinetic fatigue test protocol. Peak knee joint moments were computed for each repetition, and the H:Q conventional ratio (H:QCR ) was calculated using several different, previously published, methods RESULTS: Knee extensor and flexor moments were statistically decreased by the sixth repetition and continued to decrease until the end of the protocol. However, the H:Q ratio was statistically decreased at the end of the test due to a significant reduction in knee flexor moment (correlation between change in knee flexor moment and change in H:Q, r≈0.80; p<0.01). Moreover, H:Q measured in fatigue (i.e. H:QFatigue ) at the end of the test was greater than H:QCR (1.25-1.38 vs. 0.70, p<0.01), these variables were weakly correlated (r=0.39, p=0.02), and subject rankings within the cohort based on H:QCR and H:QFatigue were different (rs =0.25, p=0.15) CONCLUSION: The present data suggest that H:Q ratio measurement during a fatiguing test (H:QFatigue ) provides different outcomes to the traditional H:QCR . The observed significant hamstrings fatigue and the difference, and weak correlation, between H:QCR and H:QFatigue indicates that useful information might be obtained with respect to the prediction of HS and ACL injury risk. The potential predictive value of H:QFatigue warrants validation in future prospective trials. This article is protected by copyright. All rights reserved.

Reference

Pinto MD, Blazevich AJ, Andersen LL, Mil-Homens P, Pinto RS. Hamstring-to-quadriceps fatigue ratio offers new and different muscle function information than the conventional non-fatigued ratio. Scandinavian Journal of Medicine and Science in Sports 2017;28(1):282-293.
doi: 10.1111/sms.12891

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