Figure 8 : The phase planes for the lumbar spine (A) and pelvis (B), and the curve of continuous relative phase (C) for a sample trial of forward bending and backward return.

The angles “a” and “b” represent the phase angle of the lumbar spine and pelvis, respectively.

Bazrgari et al.Physical Therapy and Rehabilitation  2016 3:5DOI : 10.7243/2055-2386-3-5