Fig. 6. Total isometric force (active + passive force) at the final length (f), and total isometric force following muscle stretching of 3 mm, 6 mm and 9 mm (3, 6 and 9, respectively) to the final length (f) for representative tests at a stretching speed of 3 mm s^-1. Note that the steady-state force enhancement following stretching increases with increasing magnitudes of stretching on the descending limb of the force—length relationship of cat soleus muscle. The corresponding mean results of force enhancement across all muscles, speeds of stretching, and activation frequencies are summarized in Table 2.