Key result
An extended hip position during isokinetic eccentric knee flexor trials elicited a greater peak torque compared to a seated position (P=0.04), achieved at a greater degree of knee flexion (P<0.001).
Why the study?
Isokinetic dynamometry testing protocols and outcome metrics can lack functional relevance, prompting evaluation of dynamometer configuration on eccentric hamstring strength metrics.
Does an extended hip position compared to a seated position alter eccentric hamstring strength metrics during isokinetic dynamometry in trained participants?
Does an extended hip position compared to a seated position alter eccentric hamstring strength metrics during isokinetic dynamometry in trained participants?
p-value: p=0.04
Dynamometer configuration significantly affects eccentric hamstring strength metrics, which has implications for clinical assessment and training adaptations.
Hip position influences eccentric hamstring metrics; leaves open optimal testing configuration for functional relevance.
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°·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 ~44° and ~21°, 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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Brown et al. (2022) studied Healthy trained participants (n=23). Extended hip position vs. Seated hip position was evaluated on Peak torque (p=0.04). An extended hip position during isokinetic eccentric knee flexor trials elicited a greater peak torque compared to a seated position (P=0.04), achieved at a greater degree of knee flexion (P<0.001).
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