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Warm rearing modifies temperature regulation in rats

M Caputa1, A Demicka

  • 1N. Copernicus University, Department of Animal Physiology, Toruń, Poland.

Journal of Physiology and Pharmacology : an Official Journal of the Polish Physiological Society
|June 1, 1995
PubMed
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Early warm exposure in rats significantly alters thermoregulation compared to adult acclimation. Warm-reared rats show distinct physiological and morphological changes, impacting their ability to cope with heat.

Area of Science:

  • Physiology
  • Environmental Adaptation
  • Animal Science

Background:

  • Thermoregulation is crucial for survival in varying environments.
  • Understanding developmental plasticity in thermal tolerance is key.
  • Early life environmental exposures can have lasting physiological effects.

Purpose of the Study:

  • To compare the thermoregulatory effects of early (postnatal) warm exposure with adult warm acclimation in rats.
  • To investigate morphological and functional adaptations in warm-reared rats.

Main Methods:

  • Pregnant rats were exposed to 35°C from 7 days before term; offspring were housed in warm conditions for 6+ months.
  • Warm-reared (wr) rats were compared to control and warm-acclimated (wa) adult rats.
  • Morphological measurements, salivary gland mass, and core body temperature regulation were assessed.

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Main Results:

  • Warm-reared rats were leaner, lighter, with larger tails and feet compared to controls and wa rats.
  • Salivary gland mass was significantly elevated in wr rats.
  • Core temperature was regulated higher in wr rats, and they exhibited better exercise performance under hyperthermia.

Conclusions:

  • Early-life high-temperature exposure induces distinct developmental changes in thermoregulation, differing from adult acclimation.
  • These adaptations in warm-reared rats may model genetic adaptations to thermal environments.
  • Early environmental factors play a critical role in shaping long-term physiological responses to heat.