Muscle activity for each subtype during walking.
(A) Solid black lines and gray areas represent the mean ± 95% confidence interval. The values are given as percentage. From the top to bottom the figure shows the tibialis anterior (TA), soleus (Sol), medial gastrocnemius (MG), vastus medialis (VM), rectus femoris (RF), semitendinosus (MH), biceps femoris (LH), and gluteus medius (GM) muscle activity during the 100 percent gait cycle in comfortable walking speed. (B) The data are reported as the mean ± 95% confidence interval. The graph indicate the subtypes in the merging pattern of muscle synergy in comfortable walking speed, where subtype 1 is the merging pattern of modules 1 and 2, subtype 2 is the merging pattern of modules 1 and 4, and subtype 3 is the merging pattern of modules 3 and 4. The bottom bar graph shows the weight coefficients for the eight muscles on the paretic side included in the merged muscle synergy.