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Muscle activity during intraspinal stimulation. (A) Stimulation (3 s stimulus duration, 50 Hz, 200 μs pulse width, 10 to 50 μA) was applied via microelectrode array contacts 1 (+) and 3 (−). (B) Intramuscular electromyography recordings from the biceps femoris, hamstrings, rectus femoris, and gluteus medius muscles evoked by stimulation (shaded regions) at increasing intensities ranging from 10 to 50 μA.
