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Conduction velocity along human muscle fibers in situ

1st Neurological Clinrc, University Medical School, Torino, Italy.

When muscle fibers are stimulated in the distal portion of the human biceps brachii, far enough from the end-plate region, a discrete single fiber activity can be picked up proximally by means of a selective recording electrode. The distally evoked potentials show a linear relationship between latency and distance and can be recorded also in curarized patients. The risk of stimulating the intramuscular nerve endings is remote and, when it occasionally happens, the indirectly evoked muscle activity can be distinguished from the direct one. As direct muscle stimulation is feasible and safe, propagation velocity along single fibers can be determined in situ over a long distance. The results obtained in 50 normal subjects are presented.

Address correspondence and reprint requests to Dr. Troni, Clinica Neurologica dell'Università Via Cherasco 15, 10126 Torino, Italy.

Presented in pait at the 5th Infernational Congress on Neuromuscular Diseases, Marseilles, September, 1982.

Accepted for publication February 23, 1983.

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