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Related Experiment Videos

Finger and forearm vasodilatatory changes after local cold acclimation.

G Leftheriotis1, G Savourey, J L Saumet

  • 1Laboratoire de Thermorégulation et Energétique Musculaire, C.N.R.S. URA 65, Lyon, France.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1990
PubMed
Summary

Local cold acclimation alters vascular responses to cold. Cold-acclimated individuals showed reduced blood flow during post-ischaemia and exercise in cooled conditions, indicating significant vascular changes.

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Area of Science:

  • Physiology
  • Vascular Biology
  • Environmental Medicine

Background:

  • Local cold acclimation can induce physiological adaptations in vascular function.
  • Understanding these adaptations is crucial for predicting responses to cold exposure.

Purpose of the Study:

  • To investigate vascular changes following local cold acclimation.
  • To assess the impact of cold acclimation on post-ischaemic and exercise-induced vasodilatation.

Main Methods:

  • Venous occlusion plethysmography was used to measure peak blood flow (PBF) in the finger and forearm.
  • Measurements included post-ischaemic (PBFisc), exercise-induced (PBFexe), and combined (PBFisc + exe) vasodilatation.
  • Tests were conducted under non-cooled (25°C) and cooled (5°C) conditions in locally cold-acclimated and non-acclimated subjects.

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Main Results:

  • Cold acclimation limited the decrease in skin temperature during cooling.
  • Post-ischaemic blood flow (PBFisc) was significantly reduced in the cooled condition for cold-acclimated subjects in both finger and forearm.
  • Forearm exercise-induced blood flow (PBFexe) was also significantly decreased in the cooled condition for cold-acclimated subjects.

Conclusions:

  • Local cold acclimation leads to altered vascular responses, particularly a reduction in blood flow during cooling.
  • These findings suggest that cold acclimation affects both peripheral and muscle blood flow regulation under cold stress.