Figure 7.

Force and length responses in with and without interval conditions. Black line indicates the pure shortening condition (isometric-active shortening). Blue line indicates the normal SSC condition (isometric-active stretch-active shortening). Red line indicates the SSC with interval (isometric-active stretch-isometric-active shortening). Although the force in the SSC with interval condition decreased after the end of active stretch, the force at the onset of active shortening was still greater compared to the force attained in the pure shortening condition (red arrows). This result indicates the existence of residual force enhancement (RFE; Reproduced with permission from Fukutani et al., 2017a).