Fig. 5

Group average (n = 28) for each of the four muscle synergies at natural and fast walking speeds. a Activation timing profiles for each synergy over the gait cycle with corresponding global VAF (variance accounted for). Group average (full line) and average + 1SD (dotted lines). b Muscle weightings average and SD of the four synergies. RF = rectus femoris, VM = vastus medialis, TA = tibialis anterior, MG = medial gastrocnemius, SO = soleus, ST = semitendinosus, BF = biceps femoris, GM = gluteus medius