Fig. 8.

Determining ν_max as a function of muscle activation. a The same quick release and quick stretch experiments as in Fig. 4a were used but the velocity immediately after the slope discontinuity (see inset) was used. Initial length was 1.41 mm (rest length). b Force versus contraction velocity for two force steps at each of three activation levels (and the relevant rest length isometric tetanic force for the ν = 0 points) were plotted and fit with a modified Eq. 17 (see text) to determine ν_max at each activation level. c These ν_max values were used to fit the ν_max(act=1) term in Eq. 19