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Figure 1


Fig. 1. Schematic illustrating how residual force enhancement (rFE) could be generated by a parallel elastic component (PEC) that increases in stiffness when the muscle is activated. The solid line is the force–length relationship of the PEC in a relaxed muscle. The broken line is the force-length relationship of the PEC when the muscle is activated with the PEC at the length LA. The stiffness of the PEC, but not the force, increases upon activation. If an isometric contraction is performed when the PEC is at LB, it exerts a force F1. However, if the muscle is activated when the PEC is at LA and is then stretched until the PEC reaches LB, the PEC force will be F2. The rFE is F2–F1.





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