Fig. 1
Metabolic cost of locomotion across the different speeds and different angles of decline for each foot attachment conditions. Iso-metabolic power lines (representing effort) at 11, 14 and 17 ml O2 kg− 1 min− 1 are presented. Note that this Fig. 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). The metabolic cost of walking (dashed line) in non-amputees, previously reported in the literature are plotted for comparison [40]. Data are mean ± SEM