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Fascicle rotations (change of pennation) and changes of belly thickness that occur during cycling in the ankle extensor muscles (medial gastrocnemius: filled diamonds, solid line; lateral gastrocnemius: open diamonds, dashed line; soleus: triangles, dotted line). Points show the mean ± s.e.m. Least-squares regression lines are shown for cases where there was a significant effect of cycle frequency or crank torque on the velocity (p < 0.05, ANCOVA).
