Figure 2 —

Muscle activity during passive and volitional pedaling in PASSIVE subjects: representative examples and group averages. (a) Representative examples of EMG (raw and unprocessed) during passive and volitional pedaling in the nonparetic and paretic legs of one stroke subject and in the right leg of one control subject able to minimize muscle activity for passive pedaling. Data are shown for five revolutions. (b) Group average EMG (rectified, filtered, and ensemble-averaged) for the nonparetic, paretic, and control limbs from all subjects able to minimize muscle activity during passive pedaling. EMG = electromyography; TA = tibialis anterior; MG = medial gastrocnemius; RF = rectus femoris; BF = biceps femoris; AM = adductor magnus; POS = pedal position.