Fig. 6.
Group data (means ± SE, n = 5) during isometric elbow flexion for cervicomedullary motor evoked potential (CMEP) amplitudes of the biceps (A) and triceps brachii (B) and prestimulus (Pre-stim) electromyography (EMG) before transmastoid electrical stimulation for C) the biceps and D) triceps brachii. Black, gray, and white bars correspond to supinated, neutral, and pronated forearm postures, respectively. CMEP amplitudes are shown relative to the maximum M wave (Mmax) taken during the same conditions. EMG is normalized to the maximum EMG found during muscle-specific maximal voluntary contractions.