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[Electrophysiological analysis of the effect of cortisone on the rat neuromuscular apparatus].

The influence of cortisone (1.5 mg per 100 g of body weight, daily, for 10 days) on the neuro-muscular system was studied in rats in situ. The action potentials of the nerve and muscle were recorded with the extracellular electrodes. The rest potentials (RP) of the muscle fibers and the miniature end-plate potentials (MEPP) were recorded with the intracellular glass microelectrodes. A decrease of the RP and the MEPP amplitude, and an increase of the MEPP frequency and prolongation of the neuromuscular transmission time were revealed in rats given daily doses of cortisone, 1.5 mg/100 g of body weight, during 10 days; reliability of the neuro-muscular transmission (acceleration of the fall of the muscle action potential amplitude during tetanus) proved to decrease under the action of cortisone.