Fig. 7

Prosthesis analysis. Additional analysis examined the average power (A), force–displacement profiles (B), and mechanical work in the entire stance phase (C) of the prosthesis and pylon compression in all levels of stiffness and speed. The force–displacement profiles (B) provide a visual representation of the net negative work produced from the pylon’s compression (arrows indicate the time-progression during stance). The magnitude of net negative work increased as the pylon became less stiff. Significant stiffness, speed, and interaction effects are denoted by ‘*’, ‘ + ’, and ‘x’ symbols, respectively