Fig. 2.

A: changes in the area (y-axis) bounded by the fascicles is plotted as lines with open circles (passive condition) and solid circles (active eccentric contraction) with the x-axis of the graphs representing the 22 cine-MRI frames throughout the ankle dorsiflexion-plantar flexion cycle. B: change in fascicle length and in-plane and through-plane thicknesses of the fascicle during passive (top) and active eccentric (bottom) ankle dorsiflexion-plantar flexion cycle. Values are means and SD. *P < 0.05 vs. first time phase. #P < 0.05, passive condition vs. active eccentric contraction.