Group mean changes in gait cycle duration during knee perturbation trial and aftereffect.

(A) Shows the change in gait cycle period percentage of the full amplitude knee perturbation condition with decreasing electrical stimulation period. The bars represent the average change in gait cycle period percentage for the 9 subjects who exhibited entrainment in at least one stimulation period of this condition (B) Shows the change in gait cycle period percentage of full amplitude knee perturbation condition with increasing period electrical stimulation. The bars represent the average change in gait cycle period percentage for the 5 subjects who exhibited entrainment in at least one stimulation period of this condition. The asterisks (*) placed over the vertical bars shows the significant difference at p-value of p<0.05.