Figure 6
Mean COM work against walking speed for each phase of the gait cycle. The phases are (A) collision, (B) rebound, (C) preload, and (D) push-off. Fits were performed with COM work as a function of \({v}^{2.8}\) based on dynamic walking models15. Three of four (collision, preload, push-off) decreased nonlinearly in magnitude as speed decreased. Different colors denote subjects’ data at each walking speed (circles). Trend significance is indicated by solid lines (\(P < 0.05\)) and non-significance by dashed lines. COM work phases were less distinguishable at slower speeds. Trials with phases detected for less than 50% of the strides were not included in the fit (denoted by grey symbols). Data at self-selected speeds not included in fit (shaded region). Work is shown in both dimensionless (left axes) and SI form (right axes); speed is also shown in both dimensionless (lower axes) and SI form (upper axes).
