Effect of knee flexion angles during maximum isometric hip extension

The purpose of this study was to examine the effects of knee flexion angles during maximum isometric hip extension. The results of this study suggest that the muscle length of the hamstrings is closer to the optimal length in the extension position than in the deep flexion position, which makes it easier for the hamstrings to act and exert force in the isometric hip extension movement.

Japanese Journal of Physical Fitness and Sports Medicine