Figure 5. Mean EMG for walking and running at four gravity levels for all subjects.

We took the mean rectified averaged EMG over the complete stride for each subject and then normalised to the maximum value recorded for that subject regardless of gait. We used a repeated measures ANOVA to determine if gravity level had a significant effect on mean EMG for each gait (*P < 0.05). Error bars are standard errors of the mean and are sometimes small enough to be hidden by the symbol.