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Transverse flow of middle frequency alternating current a new method for the study of cell rhythms in muscle fibers


, : Transverse flow of middle frequency alternating current a new method for the study of cell rhythms in muscle fibers. Vierteljahrsschrift der Naturforschenden Gesellschaft in Zuerich 124(3): 157-168

Transverse flow of middle-frequency (m.f.) (5000 Hz) alternating current applied to a proximal nerve-free portion of frog sartorius muscle was an appropriate method to elicit inherent spike rhythms in muscle fibers. An adequate compensation of the activating current artifact was achieved by means of an RC-bridge array. The primary effect of the m.f. current flow as a slowly rising, even, reactive depolarization. With a flat current rise, the increasing reactive depolarization after reaching threshold gave way to rhythmic spike activity (no accommodation). Two forms of repetitive spike activity were elicitable: trains of rapidly repeated spikes (50-290/s) and series of spikes at low rate (4-8/s). The difference in spike rate corresponds to a difference in the course of self-repolarization. Within the trains, the depolarization to the next spike occurred immediately after a 1-stage, partial repolarization. Within the series, the repolarization occurred in 2 stages: a rapid stage followed by a slow one reaching nearly the level of the resting membrane potential.

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