RISPOSTE MUSCOLARI TARDIVE (F-H) E VELOCITA DI CONDUZIONE. A) CONSIDERAZIONI METODOLOGICHE IN SOGGETTI NORMALI

A study was made in 30 normal subjects of the characteristics of the F responses obtained from the extensor digitorum brevis and from the abductor digiti minimi manus. The F responses from the extensor digitorum brevis showed a remarkable interindividual variability in the frequency of their appearances. These, however, could be found to be a reconduction of a limited number of potentials of simple morphology that were well characterized, and probably representing the antidromic volley of single spinal motor neurones. On the other hand the F responses from the abductor digiti minimi manus showed a raised frequency of appearance in almost all of the subjects. Also determined were the proximal maximal motor conduction velocity and the distal maximal motor conduction velocity of the deep peroneal nerve, and of the posterior tibial nerve. Confirmation was obtained of the proximo-distal gradient of the conduction velocity. In all the subjects the velocity of conduction along the H circuit was determined.