Figure 2.

External positive (W⁺) and negative (W⁻) mechanical work (J/step/kg) for normal weight and obese subjects during a step (A), double support (B), and single support (C). All data are mean (SE). There were no significant differences in external work between the groups during a step, double support or single support. During double support, the trailing leg performed primarily positive work while the leading leg performed primarily negative work.