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Noninvasive measurement of central sensory and motor conduction

Division of Neurology, the University of British Columbia.

Potentials evoked by median and peroneal nerve stimulation were digitally filtered between 300 and 2,500 Hz to measure early latency components and assess sensory cord conduction velocity. Short (Rl) and long (R2) latency reflex responses were recorded from contracting thenar and tibialis anterior muscles. R1 is considered a spinal reflex akin to the H-reflex. Clinical evidence suggests that R2 involves a reflex arc with turnaround at the motor cortex. Sensorymotor cord velocity was derived from the latencies of R1 and R2. The method can be used to compare peripheral and central sensory conduction or conduction in central sensory and motor pathways.

Address correspondence and reprint requests to Dr. Eisen, Neuromuscular Diseases Unit, Vancouver General Hospital, 855 West 12th Avenue, Vancouver, BC V5Z 1M9, Canada.

Supported by grants from the Medical Research Council of Canada and the Dystonia Medical Research Foundation.

Presented in part at the thirty-sixth annual meeting of the American Academy of Neurology. Boston, MA, April 1984.

Accepted for publication August 9, 1984.