Fig. 2. EMG onset and duration relative to the running cycle. (A) EMG onset phases are represented by the start of the solid boxes and the left-hand error bars. The duty cycle (or burst duration normalized to cycle duration) was 7.3±6.2 % (N=6) for muscle 177c (green box) and 17.0±9.1 % (N=6; means ± S.D.) for muscle 179 (red box) and is represented by the length of the box and the right-hand error bars. The shaded region is the phase during which the extensors were shortening during the running cycle. (B) Normalized muscle strain plotted versus phase. Muscle length for each muscle, where 177c is represented by the solid line and 179 is represented by the dashed line, was normalized relative to its maximum and minimum lengths.
