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J Appl Physiol 41: 111-114, 1976;
8750-7587/76 $5.00
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Journal of Applied Physiology, Vol 41, Issue 1 111-114, Copyright © 1976 by American Physiological Society

ARTICLES

Implantable electrode for recording nerve signals in awake animals

I. Ninomiya, Y. Yonezawa and M. F. Wilson

An implantable electrode assembly consisting of collagen and metallic electrodes was constructed to measure simultaneously neural signals from the intact nerve and bioelectrical noises in awake animals. Mechanical artifacts, due to bodily movement, were negligibly small. The impedance of the collagen electrodes, measured in awake cats 6-7 days after implantation surgery, ranged from 39.8-11.5 komega at a frequency range of 20-5 kHz. Aortic nerve activity and renal nerve activity, measured in awake conditions using the collagen electrode, showed grouped activity synchronous with the cardiac cycle. Results indicate that most of the remal nerve activity was from postganglionic sympathetic fibers and was inhibited by the baroceptor reflex in the same cardiac cycle.


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