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Post tetanic potentiation and inhibition in single fibers isolated from frog rana pipiens semitendinosus muscle






Japanese Journal of Physiology 32(1): 103-120

Post tetanic potentiation and inhibition in single fibers isolated from frog rana pipiens semitendinosus muscle

The twitch contractions of single fibers from the frog semitendinosus, innervated and denervated, were studied consecutively over a brief period (2-3 s) of conditioning stimulation (CS), at frequencies varying from 1-120/s. Twitch potentiation was consistently observed in denervated fibers at all rates of CS used. Maximal potentiation was attained within the first 12 s after the end of CS, which then decayed progressively. The overall duration of the effect was longer than 5 min. The time course of potentiated twitches was slightly shortened. Inhibition preceding potentiation was the prevailing effect on innervated fibers under the present conditions. Inhibition appeared either after a short interval (.ltoreq. 500 ms) between the end of CS and the beginning of the subsequent twitch, or after several repetitions of the conditioning schedule. The latter form of inhibition was replaced by potentiation when the corresponding fibers were allowed to rest for 60 min before further conditioning stimulations. Maximal inhibition was attained shortly after the end of CS, which then progressively disappeared. On occasion, inhibition lasted longer than 5 min. The time course of inhibited twitches was slightly enlarged. After fatigue, CS produced twitch inhibition on innervated fibers. In denervated muscles the effect was either potentiation or inhibition.

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Accession: 006153390



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