Hypothalamic Temperature in the Cat during Feeding and Sleep

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Abstract
Anterior hypothalamic temperature is reported for the unanesthetized cat resting at an air temperature of 22° to 25°C during the ingestion of cold or warm liquids, and during sleep. Drinking cold (5°C) milk resulted in an immediate depression of hypothalamic temperature and a period of peripheral vasodilation in the ear and forepaw foot and toe pads, followed by a drop in rectal temperature. Drinking warm (body temperature) milk did not bring about these changes. Hypothalamic temperature during sleep is lower by approximately 0.5°C and is characterized by widely varying, slow-frequency oscillations, compared to the higher, more precisely controlled temperature seen when the animal is awake.

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