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Am J Physiol Regul Integr Comp Physiol 267: R1154-R1160, 1994;
0363-6119/94 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 267, Issue 4 1154-R1160, Copyright © 1994 by American Physiological Society

ARTICLES

Ventral medullary surface activity during sleep, waking, and anesthetic states in the goat

D. M. Rector, D. Gozal, H. V. Forster, P. J. Ohtake, L. G. Pan, T. F. Lowry and R. M. Harper
Department of Anatomy and Cell Biology, University of California at Los Angeles School of Medicine 90024-1763.

We examined activity, measured as changes in reflected light, from the surface of a rostral ventral medullary area that is involved in cardiorespiratory control. We collected images during sleep and waking states and during halothane anesthesia in five adult unrestrained goats. During quiet sleep, overall activity increased and overall variability decreased compared with waking levels, whereas rapid eye movement sleep increased variability, and average activity decreased to near-waking levels. Distinct regions of activation and suppression appeared during sleep states. Deep anesthesia decreased activity and minimized variation. We speculate that alterations in rostral ventral medullary surface activity may play a role in state-dependent changes in cardiorespiratory control mechanisms.


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