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Hip and knee accelerations after stimulation of RF, VM or both muscles simultaneously at (a) toe off and (b) early swing phase posture. Each curve represents a different subject. Peak induced accelerations over a 110 ms window following the end of the stimulation (i.e. from 90 to 200 ms after the stimulus onset) are highlighted by small circles. Induced hip and knee accelerations were extensor (negative direction) in all cases, and largest for simultaneous muscle stimulation.
