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Chronic exposure to a 60-Hz electric field: Effects on neuromuscular function in the rat

✍ Scribed by R. A. Jaffe; B. L. Laszewski; D. B. Carr

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
603 KB
Volume
2
Category
Article
ISSN
0197-8462

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✦ Synopsis

Abstract

Neuromuscular function in adult male rats was studied following 30 days of exposure to a 60‐Hz electric field at 100 kV/m (unperturbed field strength). Isometric force transducers were attached to the tendons of the plantaris (predominantly fast twitch), and soleus (predominantly slow twitch) muscles in the urethan‐anesthetized rat. Square‐wave stimuli were delivered to the distal stump of the transected sciatic nerve. Several measurements were used to characterize neuromuscular function, including twitch characteristics, chronaxie, tetanic and posttetanic potentiation, and fatigue and recovery. The results from three independent series of experiments are reported. Only recovery from fatigue in slow‐twitch muscles was consistently and significantly affected (enhanced) by electrifield exposure. This effect does not appear to be mediated by field‐induced changes in either neuromuscular transmission, or in the contractile mechanism itself. It is suggested that the effect may be mediated secondary to an effect on mechanisms regulating muscle blood flow or metabolism.

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