Abstract
5. During the step cycle the peaks of both MG and SOL force profiles occur before the end of the yield (E2) phase, as both muscles undergo active lengthening. In contrast, peak MG and SOL forces during vertical jumping coincide with the end of active lengthening and the onset of ankle extensor shortening. 6. The results are consistent with the hypothesis that the inherent stiffness of active muscle during the step cycle is an important factor in the control of force output from hindlimb extensor muscles in locomotion. The division of labor between MG and SOL and the absolute force levels required from the MG during the full range of hindlimb movements in posture, locomotion, and jumping appear to be precisely matched to the very different characteristics of the motor-unit populations composing these synergistic muscles.
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