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Related Experiment Videos

Hypothermic general cold adaptation induced by local cold acclimation

G Savourey1, B Barnavol, J P Caravel

  • 1Unité de Thermophysiologie, La Tronche, France.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1996
PubMed
Summary

Local cold acclimation improved lower limb cold tolerance and induced general cold adaptation. However, this adaptation was not linked to local changes or habituation, suggesting a different underlying mechanism.

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Area of Science:

  • Physiology
  • Environmental Medicine
  • Human Adaptation

Background:

  • Understanding the relationship between local and general cold adaptation is crucial for predicting human physiological responses to cold environments.
  • Local cold acclimation (LCA) of the lower limbs may influence whole-body responses to cold stress.

Purpose of the Study:

  • To investigate the relationship between local cold adaptation of the lower limbs and general cold adaptation.
  • To determine if local cold acclimation affects physiological responses during whole-body cold exposure.

Main Methods:

  • Eight subjects underwent a cold foot test (CFT) and a standard cold air test (SCAT) before and after LCA.
  • LCA involved repeated cold water immersions of the lower limbs.
  • Physiological parameters including skin temperature, rectal temperature, and plasma noradrenaline (NA) were measured.

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Main Results:

  • LCA resulted in local cold adaptation, evidenced by higher lower limb skin temperatures during CFT.
  • A hypothermic insulative general cold adaptation was observed after LCA, indicated by decreased rectal and mean skin temperatures during SCAT (P < 0.05).
  • Metabolic heat production during SCAT did not change, and lower limb skin temperatures remained unaffected post-LCA. Decreased plasma NA during LCA suggested habituation, while increased NA during SCAT post-LCA indicated a different response.

Conclusions:

  • Local cold adaptation of the lower limbs is associated with habituation, indicated by decreased noradrenaline levels.
  • Hypothermic insulative general cold adaptation appears unrelated to local adaptation or habituation, possibly linked to a "T3 polar syndrome".