Fig. 5
Net metabolic power (Ėmet) was predicted by prosthetic ankle stiffness (k) and load (l). Net metabolic power was normalized to biological body mass. Each open circle is a participant’s data point. The blue line represents the equation at no load, and the red line represents the equation for the 30% additional load condition. \( {\dot{\mathrm{E}}}_{met}=3.416+0.015\bullet l-6.809\bullet {k}^2 \)