Figure 4
Representative waveforms during shoulder abduction in the 1.0-s condition. MD: right middle deltoid; ES: left erector spinae; GM: left gluteus medius; Acceleration: arm movement acceleration; CoPml: center of pressure in the mediolateral direction; CoPap: center of pressure in the anteroposterior direction; Force: force applied to the wristband; S1: cue signal; S2: imperative signal. Solid vertical arrows indicate ES and GM burst onset. Dashed arrows indicate CoPml and CoPap displacement.