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J Appl Physiol 57: 1738-1741, 1984;
8750-7587/84 $5.00
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Journal of Applied Physiology, Vol 57, Issue 6 1738-1741, Copyright © 1984 by American Physiological Society

ARTICLES

Respiratory responses to noxious and nonnoxious heating of skin in cats

T. G. Waldrop, D. E. Millhorn, F. L. Eldridge and L. E. Klingler

Respiratory responses to increased skin temperatures were recorded in anesthetized cerebrate and in unanesthetized decerebrate cats. All were vagotomized, glomectomized, and paralyzed. Core body temperature and end-tidal Pco2 were kept constant with servoncontrollers. Stimulation of cutaneous nociceptors by heating the skin to 46 degrees C caused respiration to increase in both cerebrate and decerebrate cats. An even larger facilitation of respiration occurred when the skin temperature was elevated to 51 degrees C. However, respiration did not increase in either group of cats when the skin was heated to 41 degrees C to activate cutaneous warm receptors. The phenomenon of sensitization of nociceptors was observed. Spinal transection prevented all the respiratory responses to cutaneous heating. We conclude that noxious, but not nonnoxious, increases in skin temperature cause increases in respiratory output.


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