Kloosterman MGM, Snoek GJ, Kouwenhoven M, Nene AV, Jannink MJA. Influence of gravity compensation on kinematics and muscle activation patterns during reach and retrieval in subjects with cervical spinal cord injury: An explorative study. J Rehabil Res Dev. 2010;47(7): 617–28. DOI:10.1682/JRRD.2010.02.0014

Figure 6. Examples of muscle activation patterns and corresponding elbow angle: (a) Alternating activation pattern between biceps and triceps (subject identification [ID] number 2), (b) simultaneous pattern between anterior and posterior part of deltoid (subject ID number 3), and (c) simultaneous pattern between anterior deltoid and pectoralis major (subject ID number 11).