Fig. 9. Mean stress during the transition (s_t; see Fig. 7B) was associated with stretch velocity (v) of the ventral interior lateral muscle by the relationship s_t=0.0161v+0.0158 (N=5, P<0.001). Values are means ± 1 s.e.m. Despite considerable variation between individual muscle preparations, r² values of the stress vs stretch velocity relationship for individual muscles were all >0.90 and averaged 0.97.