Factors determining changes in lower limb energy during swing in treadmill running.
This investigation determined the manner in which the lower limb is supplied with mechanical energy in the recovery phase of treadmill sprinting. This was done by following energy input to each limb segment through joint force power and muscle moment power. Joint force power and concentric muscle moment power at the hip are responsible for changes in limb energy although eccentric knee muscle moment power continually reduces total limb energy. In early recovery energy is transmitted distally to raise all segmental energies. In late recovery energy lost from shank and foot is transmitted proximally to the hip without loss in thigh energy. Interlimb exchanges of energy indicate that energy lost in late recovery is transmitted across the pelvis to provide a gain in energy in the opposite limb in early recovery. Much of the loss in limb energy appears to result from the presence of two joint muscles.
D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007866:Leg / Q000502:physiology*; D012420:Running; D013816:Thermodynamics