Fig. 5. Normalized force-velocity relationships for muscles 178 and 179. The normalized force-relative shortening velocity relationships did not differ between muscles 178 (filled, blue symbols) and 179 (red broken line). The solid blue line represents the curve fitted to the data for muscle 178 using the Hill equation. The arrow indicates the maximum shortening velocity experienced by both muscles when cyclically contracting at 15% strain. Different symbol shapes represent different individuals. The broken, red line representing the curve fit using the Hill equation for muscle 179 is presented for comparison (Ahn and Full, 2002).