Fig. 3
From: Human arm weight compensation in rehabilitation robotics: efficacy of three distinct methods
Data interpretation of raw EMG data to the smooth rectified EMG (SRE): Raw EMG data of a bizeps brachii measurement in position P1 for the active and passive reference measurement (SREactive, SREpassive). The dashed lines correspond to the shortening of EMG recording 2.5 s in the beginning and end. Finally, the SRE is calculated as the linear envelope of the selected raw EMG data