Fig. 5

The efficiency of positive work production during level and decline walking using either rigA-F and hyA-F prosthesis. Data are mean ± SEM. Note that this figure highlights absolute speed rather than percentage of customary; the value plotted is the mean absolute speed for each category of relative customary speed category (0.8, 1, 1.2, 1.4 and 1.6 of customary speed: NB group mean customary speed was 0.98 m s^− 1)