Fig. 11
From: Human activity monitoring system based on wearable sEMG and accelerometer wireless sensor nodes
sEMG-derived features. Circles denote the MAV mean within the window, normalized with respect to the whole signal MAV mean, and is thus an index of the average contraction level of the muscle for the specific exercise. Stars denote the ratio between the mean of the peak values within the window and the window mean. It is an index of involvement of the muscle in performing the movement