(a)
(b)
Figure 1: Presentation of fast bilateral shoulder flexion (a) and sudden arm loading task (b). A detailed positioning of the visual cue (1), accelerometer (2), load release system (3), electrocardiogram electrodes (4) and EMG electrodes for obliquus externus (5), muscle obliquus internus (6), muscle erector spine (7), muscle multifidus (8), and reference electrode (9) is presented.