As mentioned, the hip is in a flexed position during the late swing phase. Given the biarticular nature of the hamstrings, this hip-flexion position influences muscle activity. Several researchers23–26 have shown that both isometric and concentric knee-flexion torques are greater
when the hip is flexed (seated) rather than extended (supine).However, none of these authors has explored the influence of hip-flexion angle on hamstrings peak torque during eccentric contraction. Worrell et al26 investigated the influence of hip flexion on H:Q ratio and found a greater ratio in the seated than prone position. Most H:Q ratio assessments are performed in a seated position (ie, between 708 and 908 of hip flexion). To reliably compare individuals, we need a consensus on a more precise hip-flexion angle for isokinetic evaluation. This consensus exists already for the angular velocity and the contraction mode.27