A critique on stabilograms

The equations of motion for a standing human reveal three mechanisms for balance

“…For foreaft movements (XY plane) Geursen et al (1976) found (a) l ¼ 1:20 and (b) 1.24 h, for the cases (a) in which the trunk is kept vertical and (b) rotates in line with the legs, respectively. For left-right movements Kodde et al (1979) found l ¼ 1:34 h. With the same mass distribution the real CoM is at a height of 1.10 h.…”