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Am J Physiol Regul Integr Comp Physiol 261: R334-R338, 1991;
0363-6119/91 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 261, Issue 2 334-R338, Copyright © 1991 by American Physiological Society

ARTICLES

Drinking after osmotic challenge depends on circadian phase in rats with free-running rhythms

R. F. Johnson and A. K. Johnson
Department of Psychology, University of Iowa, Iowa City 52242.

Rhythmic phase-dependent modulation of the amount of water intake of rats occurs after several types of dipsogenic treatments. Previous studies conducted on rats in light-dark cycles confound direct effects of the light-dark cycle with the effects of circadian rhythmicity entrained to the light-dark cycle. The present study isolates the effect of circadian phase on the amount of drinking induced by injection of hypertonic saline. Free-running rhythms were induced in rats, and then water intake was measured after injections of both hypertonic and isotonic saline at different phases of the rats' circadian cycle. After injections of hypertonic saline, rats drank more water in their active phase than in their inactive phase. No difference in the amount of intake was found in rats that received isotonic saline at different phases of their circadian rhythms. The results indicate a circadian modulation of the drinking induced by cellular dehydration.


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R. F. Johnson, T. G. Beltz, R. L. Thunhorst, and A. K. Johnson
Investigations on the physiological controls of water and saline intake in C57BL/6 mice
Am J Physiol Regulatory Integrative Comp Physiol, August 1, 2003; 285(2): R394 - R403.
[Abstract] [Full Text] [PDF]


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