Fig. 11. Mean positive and negative work per stride performed by the LG, pMG and dMG walking (black; 0.5 m s^–1) and running (grey; 2.0 m s^–1) on a level (left pair of bars) and inclined (right pair of bars) treadmill. Note that the positive work performed by the LG consistently exceeded that of both the pMG and dMG. Asterisks indicate a significant effect of speed from an ANOVA (P<0.05). Values are means ± s.e.m. (N=4).