Fig. 2
From: Why orthotic devices could be of help in the management of Movement Disorders in the young
Effects of external forces on EMG. The figure, from left to right respectively, reports the kinematics (first 3 graphs from the top) and the dynamics (last 3 graphs) of the upper limb when different type of loads are applied: inertial, viscous and elastic forces. Red arrows underline the main variations in burst intensity: antagonist bursts increase for inertial loads, decreases with viscous loads, and decreases slightly with elastic loads (adapted from Gottlieb [67])