In antidromic sensory conduction studies, the nerves were stimulated by saline soaked pads spaced 2-5 cm. apart. A Disa 14E11 constant voltage stimulating unit delivered pulses 0-1 ms in duration. Supramaximal stimuli excited the median and ulnar nerves at the wrist, and the superficial branch of the radial nerve in the lower forearm. The median and ulnar nerve CAPs were recorded with Teca ring electrodes at the index and little fingers, respectively, the recording electrodes being at the level of the proximal crease of the digit. The CAP of the superficial branch of the radial nerve at the wrist was recorded with Beckman miniature electrodes. In orthodromic conduction studies, supramaximal stimuli were delivered to the index and little fingers through Teca ring electrodes and recordings were made with Beckman miniature electrodes placed at the wrist over median and ulnar nerves, respectively. Distances (mean (range) cm) between recording and stimulating electrodes were: for females -median antidromic and orthodromic conduction 13-7 (118-15-1), ulnar antidromic and orthodromic conduction 11-2 (9-9-12 5) and radial antidromic conduction 13-3 (12
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