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J Appl Physiol 22: 1129-1134, 2005;
8750-7587/05 $8.00
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Effects of steady and cyclic hypothalamic thermal stimulation in unanesthetized cats

John W. Sundsten 1

1 Department of Biological Structure, University of Washington Medical School, Seattle, Washington

The preoptic-anterior hypothalamus (POAH) of unanesthetized cats was thermally stimulated with chronically implanted Peltier thermodes. Steady or cyclic warming and cooling caused ear vasodilation and vasoconstriction, respectively. Temperature thresholds were stable within 0.5 C. There were variations, however, in the form of the vasomotor responses. Rectal temperatures were decreased by warming and increased by cooling the POAH. Shivering in response to hypothalamic cooling at ambient temperatures was seldom observed. However, on cessation of warming the POAH, shivering occurred which could be readily inhibited by rewarming the POAH. Behaviorally, the animals assumed different postures according to the direction of thermal stimulation. These data demonstrate the effectiveness of the Peltier thermode and constitute supportive evidence for the thermal sensitivity of the POAH.

hypothalamic thermal sensitivity; warming and cooling hypothalamus; thermodes chronically implanted; thermoelectric thermode; cat thermoregulatory responses; vasomotor changes; temperature regulation

Submitted on December 14, 1966






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