Fig. 4.

Typical trace of electromyographic activity of Quadratus Lumborum (QL), Erector Spinae (ES), Gluteus Medius (GM), and Semitendinosus (S) muscles for a scoliosis patient from each scoliosis group compared to a normal subject, expressed as a function of normalized stride (expressed in %). The horizontal black bars represent the phasic activity of the muscles for the left side of the normal subject and convex side of patients. The horizontal gray bars represent the phasic activity of the muscles for the right side of the normal subject and concave side of patients