4.2 Article

The influence of isokinetic dynamometer configuration on eccentric hamstring strength metrics: implications for testing and training

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RESEARCH IN SPORTS MEDICINE
卷 -, 期 -, 页码 -

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TAYLOR & FRANCIS LTD
DOI: 10.1080/15438627.2022.2079988

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Isokinetic dynamometer; eccentric hamstring; strength curve; isokinetic testing; eccentric exercise; hamstrings; rehabilitation

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Isokinetic dynamometry is the gold standard for strength assessment, but the configuration of the equipment used can affect the results. The extended hip configuration may better reflect the nature of the hamstring muscles and the mechanism of hamstring strain injury, but the sensitivity of strength metrics to configuration has implications for clinical assessment and training adaptations.
Isokinetic dynamometry is the clinical gold standard for strength assessment but testing protocols and outcome metrics can lack functional relevance. To quantify the influence of dynamometer configuration on eccentric hamstring strength metrics, 23 trained participants completed isokinetic eccentric knee flexor trials at 180 degrees.s(-1) in a seated and extended hip position. The extended position elicited a greater peak torque (P = 0.04) which was achieved at a significantly (P < 0.001) greater degree of knee flexion. Isokinetic range and functional range (defined as 85% of peak torque) were consistent at similar to 44 degrees and similar to 21 degrees, respectively, across trials, but were achieved with a more flexed knee in the extended hip configuration. Therefore, whilst the extended hip configuration might better reflect the biarticular nature of the hamstring musculature and the mechanism of hamstring strain injury, the sensitivity of strength metrics to configuration has implications for clinical assessment and training adaptations.

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