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Related Experiment Videos

Cold-induced peripheral vasodilation at high altitudes--a field study.

H A Daanen1, H J van Ruiten

  • 1Department of Work Environment, TNO Human Factors, The Netherlands. daanen@tm.tno.nl

High Altitude Medicine & Biology
|March 21, 2001
PubMed
Summary

High altitude exposure significantly reduces cold-induced vasodilation (CIVD). Acclimatization over 45 days showed a tendency for stronger CIVD responses, unlike short-term exposure. No CIVD acclimatization occurred within the first 7 days at altitude.

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Area of Science:

  • Human Physiology
  • Altitude Medicine
  • Environmental Health

Background:

  • Cold-induced vasodilation (CIVD) is a physiological response to cold exposure.
  • High altitude environments are known to affect peripheral circulation.
  • The impact of altitude acclimatization on CIVD remains unclear in existing literature.

Purpose of the Study:

  • To investigate the effects of altitude acclimatization on cold-induced vasodilation (CIVD).
  • To compare CIVD responses between subjects with short-term and prolonged high-altitude exposure.
  • To examine longitudinal changes in CIVD during the initial week of altitude exposure.

Main Methods:

  • Study 1: Cross-sectional comparison of CIVD in subjects exposed to high altitude for 45 days versus less than 3 days.

Related Experiment Videos

  • CIVD was induced by immersing the distal phalanx of the middle finger in 0°C water for 30 minutes.
  • Study 2: Longitudinal assessment of CIVD in nine males over 7 days at 4,350 m, measuring responses before, during, and after exposure.

    • Main Results:

    • Prolonged high-altitude exposure (45 days) showed a trend towards restored CIVD responses compared to short-term exposure.
    • Short-term high-altitude exposure (<3 days) resulted in a significant reduction in CIVD.
    • No significant changes in CIVD were observed during the first 7 days of altitude exposure in the longitudinal study.

    Conclusions:

    • Cold-induced vasodilation (CIVD) responses may adapt with prolonged, but not short-term, high-altitude exposure.
    • Initial days of altitude exposure (up to 7 days) do not appear to induce acclimatization effects on CIVD.
    • Further research is needed to understand CIVD adaptations after several weeks at high altitude.