Fig.3. Average patterns of electromyographic activity in the biceps femoris (BF) and vastus lateralis (VL) during walking (mean speed 36cms-1), trotting (mean speed 64cms-1), galloping trailing limb (mean speed 96cms-1) and galloping leading limb (mean speed 83cms-1). Horizontal bars represent average temporal periods of EMG activity. For each muscle, bar thickness denotes the average relative intensity of activity. Black vertical lines represent the onset of the stance phase (foot down) and the onset of the swing phase (foot up). Values are means ± S.D. (N=4 individuals per muscle).
