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International Journal of Biometeorology

, Volume 21, Issue 1, pp 64–74 | Cite as

The effects of acclimation to alternating environmental temperature on metabolic and endocrine responses in guinea pigs, during acute heat and cold exposure

  • I. Chowers
  • R. A. Siegel
  • N. Conforti
  • L. Baranes
Article

Abstract

Male Guinea pigs (n=80) were divided into four groups and maintained in a climatic chamber for three weeks in one of the following environmental conditions: (1) Ta20°C and 55% RH; (2) Ta35°C and 30–35% RH from 08:00 to 20:00 h and 5°C; 60–65% RH, from 20:00 h to 08:00 h; (3) Ta5°C and 60–65% RH; (4) Ta35°C and 30–35% RH. At the end of this period the animals were exposed to either −5°C, 60–65% RH or 45°C, 30–35% RH, for a period of 20 min, following which Tre, plasma 11-OHCS, thyroxin, glucose, and FFA, and body and organ weights were determined. The cold-warm adapted animals seemed to develop a more efficient adaptability to acute heat and cold exposure. It is suggested that on acute exposure to severe environmental conditions the endocrine and the nervous system play a dominant role in maintaining optimal body temperature, while on chronic exposure the metabolic rate of the various organs becomes relatively more important.

Keywords

Glucose Body Temperature Metabolic Rate Dominant Role Thyroxin 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Swets & Zeitlinger B.V. 1977

Authors and Affiliations

  • I. Chowers
    • 1
  • R. A. Siegel
  • N. Conforti
  • L. Baranes
  1. 1.Department of Medicine ‘A’, Laboratory of Experimental Endocrinology and NeurologyHadassah University HospitalJerusalemIsrael

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