Influence of environmental temperature on the sleep-wakefulness cycle in the rat |
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| Authors: | W R Schmidek K Hoshino M Schmidek C Timo-Iaria |
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| Affiliation: | 1. Canadian Center for Vaccinology (CCfV) Dalhousie University, IWK Health Centre, and Nova Scotia Health Authority (NSHA), Halifax, Nova Scotia, Canada;2. Streptococci and STI Unit, National Microbiology Laboratory (NML), Public Health Agency of Canada (PHAC), Winnipeg, Manitoba, Canada;1. University of Namur, Research Unit in Environmental and Evolutionary Biology, rue de Bruxelles 61, B-5000 Namur, Belgium;2. University of Liège, Département des Sciences des Denrées alimentaires, Boulevard de Colonster, 20, Bât. B43b, B-4000 Liège, Belgium;3. University of Liège, The Mass Spectrometry Laboratory, Institut de Chimie, Bat. B6c, B-4000 Liège, Belgium;4. University of Namur, Research Unit in Cellular Biology, rue de Bruxelles 61, B-5000 Namur, Belgium;5. Université de Lorraine, Unité de Recherche Animal et Fonctionnalités des Produits Animaux, USC INRA 340, Vandoeuvre-lès-Nancy F-54505, France. |
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| Abstract: | The changes underwent by the sleep-wakefulness cycle were studied in 46 Wistar albino rats, separated as three groups which were adapted to 14°, 24° and 30°C and there-after observed under several conditions of steady or varying temperature. A strong and complex influence of the environmental thermal conditions was demonstrated. Paradoxical sleep is reduced at low and very high temperatures whereas arousal increases. Arousal and synchronized sleep are affected by the rate of temperature variation and desynchronized sleep is affected only by the direction of variation. Previous adaptation shifts the range of sleep as a function of the adaptation temperature but also of the actual thermal level. A correlation between control of the sleep-wakefulness cycle and thermoregulation is discussed. |
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