[Sympathetic action in skeletal muscle studied by recording mitogenetic radiation]

The reaction of sarcoplasmic molecular organization on the irritation of the sympathetic system was studied in tired frog muscles. The molecular changes have been determined by registration of mitogenic irradiation. The intensive irradiation recorded at the phase of highest sympathetic effect indicated the reinforcement of the regulation process it is suggested that structural and energetic substrate changes associated with irradiation are directly involved in the modulating influences of the sympathetic system.