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Science 8 June 1979:
Vol. 204. no. 4397, pp. 1098 - 1100
DOI: 10.1126/science.221974
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Articles

Science, Vol 204, Issue 4397, 1098-1100
Copyright © 1979 by American Association for the Advancement of Science

articles

Sleep and estivation (shallow torpor): continuous processes of energy conservation

JM Walker, A Garber, RJ Berger, and HC Heller

Estivation (shallow torpor) in the round-tailed ground squirrel (Citellus tereticaudus) is entered through electrophysiologically defined states of sleep. Rapid-eye-movement sleep diminishes as body temperature falls in such a way that, at a body temperature of 26 degrees to 28 degrees C, torpor is characterized by almost continuous slow-wave sleep isomorphic with that observed at euthermic body temperatures.


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Monosodium glutamate-induced arcuate nucleus damage affects both natural torpor and 2DG-induced torpor-like hypothermia in Siberian hamsters.
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Am J Physiol Regulatory Integrative Comp Physiol 294, R255-R265
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Reduced leptin concentrations are permissive for display of torpor in Siberian hamsters.
D. A. Freeman, D. A. Lewis, A. S. Kauffman, R. M. Blum, and J. Dark (2004)
Am J Physiol Regulatory Integrative Comp Physiol 287, R97-R103
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Loss of circadian organization of sleep and wakefulness during hibernation.
J. E. Larkin, P. Franken, and H. C. Heller (2002)
Am J Physiol Regulatory Integrative Comp Physiol 282, R1086-R1095
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Temperature-Independence of Circannual Variations in Circadian Rhythms of Golden-Mantled Ground Squirrels.
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J Biol Rhythms 15, 336-343
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Seasonal Affective Disorder, Hibernation, and Annual Cycles in Animals: Chipmunks in the Sky.
N. Mrosovsky (1988)
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A Continuum of Sleep and Shallow Torpor in Fasting Doves.
L. E. WALKER, J. M. WALKER, J. W. PALCA, and R. J. BERGER (1983)
Science 221, 194-195
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