[Interaction of muscle fibers in preserving indefatiguability].
Dynamics of isometric tension, EMG, and character of AP generation were studied in separate muscle fibers in albino rats during prolonged indirect stimulation (40 HZ) of m. gastrocnemius and m. soleus. M. soleus was capable to maintain 50--60% of maximal tension during 2.5 hrs, whereas m. gastrocnemius maintained only 15--20% of the maximal tension for about 15 min after the onset of stimulation. According to character of AP generation, fibers of the muscles were divided into three major types: "silent", sporadically functioning, and constantly functioning. Mechanisms of these features of the muscle function are discussed.
D000200:Action Potentials; D000818:Animals; D004576:Electromyography; D009119:Muscle Contraction; D009132:Muscles / Q000502:physiology*; D051381:Rats; D013997:Time Factors
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