Fig. 6

Muscle activation levels of both LGS and SOL during the walking stance phase by setting the allocation gain as 0, 1, and the optimal value, respectively. The blue solid, red dashed, and orange centered curves represent the muscle activation levels by using only sEMG signals, only US imaging-derived MT signals, and the fusion between sEMG and MT signals with the optimal allocation gain in both model calibration (left column) and prediction (right column) procedures. Data shown in the figure are from Participant Sub03 when walking on the treadmill at 0.75 m/s