Journal of Applied Physiology Journal of Neurophysiology
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J Appl Physiol 70: 2597-2601, 1991;
8750-7587/91 $5.00
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Journal of Applied Physiology, Vol 70, Issue 6 2597-2601, Copyright © 1991 by American Physiological Society


ARTICLES

Cerebral O2 metabolism and cerebral blood flow in humans during deep and rapid-eye-movement sleep

P. L. Madsen, J. F. Schmidt, G. Wildschiodtz, L. Friberg, S. Holm, S. Vorstrup and N. A. Lassen
Department of Clinical Physiology and Nuclear Medicine, Bispebjerg Hospital, Copenhagen, Denmark.

It could be expected that the various stages of sleep were reflected in variation of the overall level of cerebral activity and thereby in the magnitude of cerebral metabolic rate of oxygen (CMRO2) and cerebral blood flow (CBF). The elusive nature of sleep imposes major methodological restrictions on examination of this question. We have now measured CBF and CMRO2 in young healthy volunteers using the Kety-Schmidt technique with 133Xe as the inert gas. Measurements were performed during wakefulness, deep sleep (stage 3/4), and rapid-eye-movement (REM) sleep as verified by standard polysomnography. Contrary to the only previous study in humans, which reported an insignificant 3% reduction in CMRO2 during sleep, we found a deep-sleep-associated statistically highly significant 25% decrease in CMRO2, a magnitude of depression according with studies of glucose uptake and reaching levels otherwise associated with light anesthesia. During REM sleep (dream sleep) CMRO2 was practically the same as in the awake state. Changes in CBF paralleled changes in CMRO2 during both deep and REM sleep.


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