THE CHANGES IN MEMBRANE POTENTIAL PRODUCED BY ALTERNATING CURRENT OR REPETITIVE SQUARE PULSES IN THE FROG SKELETAL MUSCLE FIBRES

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  • 真島 英信
    Department of Physiology, School of Medicine, Juntendo University
  • 鷲尾 宏
    Department of Physiology, School of Medicine, Juntendo University

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1. The changes in membrane potential of frog semitendinosus muscle produced by AC or repetitive pulses were investigated with intracellular microelectrodes.<BR>2. At 100-500c/sec, responses evoked by AC or repetitive pulses were separated into successive three phases;the phase of spike potentials, the phase of alternating spike and local responses and the phase of summated local responses.<BR>3. The first two phases were shortened with increasing frequency but the third phase lasted considerably long without fatigue. Each phase in AC stimulation was longer than that in pulses stimulation, provided with the same frequency.<BR>4. The absolutely refractory period was apparently shortened when the hyperpolarizing current was applied before the test pulse.<BR>5. During the phase of summated local responses, the membrane potential showed the steady depolarization of 20-30mV for pulses stimulation and the mean depolarization of 30-40mV for AC stimulation.<BR>6. The amount of mean depolarization during AC stimulation was almost independent of the resting potential between 50-70mV or the intensity of the current examined.<BR>7. No rectification or no capacitance change was observed during AC stimulation.

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