Effects of dehydration and rehydration on body temperatures in the black Bedouin goat

Claus Jessen, Razi Dmi'el, Itzhak Choshniak, David Ezra, Gernot Kuhnen

Research output: Contribution to journalArticlepeer-review

Abstract

The temperatures of the arterial blood and the brain in black Bedouin goats were measured continuously by miniature data loggers. The animals were either euhydrated or dehydrated to 75-80% of the initial body mass by withholding water for 3-4 days during exposure to intense solar radiation. The daily blood temperature means and maxima of were significantly higher in dehydration than in euhydration, but 40°C was rarely exceeded even during the hot hours of the day. Selective brain cooling occurred in euhydration, but its extent was small when blood temperature was below 39.5°C. In dehydration, however, selective brain cooling was frequent and the standard response when blood temperature exceeded 39°C. We believe that selective brain cooling contributes to the inhibition of evaporative heat loss, which is the primary cause of the higher blood temperature in dehydration. Rapid rehydration with cold water induced long-lasting depression of blood temperature. No evidence was found for mechanisms attenuating the subsequent decrease of brain temperature which occurred a few minutes after the uptake of cold water.

Original languageEnglish
Pages (from-to)659-666
Number of pages8
JournalPflugers Archiv European Journal of Physiology
Volume436
Issue number5
DOIs
StatePublished - 1998

Keywords

  • Dehydration
  • Heat exposure
  • Hyperthermia
  • Rehydration
  • Sweating

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