Elbow flexo-extension. Joint angles for elbow (extension-downward, flexion-upward). 0 degrees is considered as full extension. Figures 3a, 3b and 3c show the mean (continue thick line) and standard deviation (dashed line) of the CG, subjects with C6 tetraplegia and subjects with C7 tetraplegia, respectively. The vertical lines delimit the duration of the phases for each group  reaching,  forward transport,  drinking,  back transport, and  return to beginning.