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. Author manuscript; available in PMC: 2007 Oct 15.
Published in final edited form as: J Biomech. 2007 Mar 13;40(12):2628–2635. doi: 10.1016/j.jbiomech.2006.12.017

Fig. 4.

Fig. 4

The passive joint moments during walking were estimated by applying the derived moment-angle functions to joint angles measured during walking. The passive hip flexor moment is shown for a single subject at a preferred walking speed. Also shown are the passive hip-flexor moments at 4 fixed knee angles (0°, 30°, 60°, and 75°). Passive energy was absorbed while the hip was extending and returned from approximately pre- to initial-swing (50–73% gait cycle). Slightly greater energy return (cross-hatched area) is achieved via the stretched rectus femoris transferring energy from the knee to the hip.