“…In our opinion, mechanical forces are not solely responsible for these observations, but rather neurophysiological control processes are also affected. Tullberg et al (1998) demonstrated that PA may be eliminated manually with no significant change in sacroiliac joint position. According to these authors, a mechanical force directed to the pelvis is only a source of input information to the control system, where it produces a specific 're-set' feature, and reexecutes a symmetrical tension pattern, which is observed in the activity of effectors.…”