Fig. 4
From: Effect of dance on multi-muscle synergies in older adults: a cross-sectional study
Time profiles of the ∆VZ index for representative dance and control subjects in the normal stepping (NS; dark line) and perturbation stepping (PS; gray line) conditions. The two ∆VZ profiles started with positive values and included a transient drop in ∆VZ during the early postural adjustment (EPA) time interval followed by another drop during the anticipatory postural adjustment (APA) time interval (gray-shaded area).The arrows represent drops of anticipatory synergy adjustment (ASA). Time zero (t0) corresponds to the alignment time, which is the time of toe-off