Figure 7

Linear-enveloped EMG and magnitude of time-integrated EMG during the propulsion phase (averaged over 3 subjects). EMG signals of SOL and TA (from paretic and non-paretic limbs) were analyzed during the last minute of each condition. Linear-enveloped EMG data (time-normalized to 101 data points across gait cycle) from NoEXO (black), UnPOW (red), and POWx3 (blue) are shown (but linear-enveloped EMG data for POWx1 and POWx2 are not for clarity). The two vertical lines define the propulsion phase of stance (i.e., onset of propulsion and toe-off). The magnitude of integrated EMG (iEMG) during the propulsion phase showed reduced paretic SOL activity (i.e., muscle that controlled the exoskeleton assistance) during all three POW conditions relative to NoEXO. The error bars represent ± 1.0 standard deviation. We note that two subjects’ EMG data were omitted due to technical difficulties, and thus we did not perform statistical analysis on EMG data because of the small sample size.