Figure 4

Ensemble mean (± 1 SD) speed normalised stance phase external moment (plantarflexion – negative, dorsiflexion – positive) and power profiles at pros end when using rigid ( rig F, dotted lines) and hydraulic ( hy A-F, solid lines) ankle-foot devices at slow (left column), customary (centre column) and fast (right column) speed levels. Negative power is power leaving the shank into the foot and positive power is power returning to the shank from the foot.