Figure 4. 10 repetitions of shoulder abduction.

For repetition 2, A illustrates the start of the concentric phase, B illustrates the end of concentric phase (start of the quasi-isometric phase, left circle) and the end of the quasi-isometric phase (start of the eccentric phase, right circle), and C illustrates the eccentric phase and the gradual transition from the eccentric phase to pause at 0 degrees abduction.