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Interaction between exercise training and cold acclimation in rats.

J LeBlanc1, P Diamond

  • 1Department of Physiology, School of Medicine, Laval University, Quebec City, Canada.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1988
PubMed
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Cold exposure increases brown adipose tissue (BAT) in rats. However, exercise during cold deacclimation accelerates BAT reduction, though thermogenic response remains enhanced, suggesting other tissues contribute to heat production.

Area of Science:

  • Physiology
  • Environmental Medicine
  • Metabolic Research

Background:

  • Brown adipose tissue (BAT) plays a crucial role in non-shivering thermogenesis.
  • Adaptation to cold environments and exercise are known to influence metabolic rate and energy expenditure.

Purpose of the Study:

  • To investigate the effects of cold acclimation and exercise training on brown adipose tissue (BAT) in rats.
  • To examine how exercise during cold deacclimation impacts BAT characteristics and thermogenic capacity.

Main Methods:

  • Five groups of rats were subjected to different regimens involving cold exposure (-15°C), exercise training, and varying durations of acclimation and deacclimation.
  • Measurements included interscapular brown adipose tissue (IBAT) mass, DNA, and protein content.
  • Thermogenic response to noradrenaline was assessed.

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Main Results:

  • Cold adaptation significantly increased IBAT mass, DNA, and protein content.
  • Exercise training alone did not affect IBAT at room temperature.
  • Exercise during cold deacclimation led to accelerated reduction in IBAT weight, DNA, and protein.
  • Despite reduced IBAT, the thermogenic response to noradrenaline was significantly enhanced in rats exercising during deacclimation.

Conclusions:

  • Cold acclimation enhances BAT characteristics.
  • Exercise training during cold deacclimation reduces BAT mass but does not impair overall thermogenic capacity.
  • Enhanced thermogenesis during deacclimation may involve tissues other than IBAT.