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Tibetans at extreme altitude.

Tianyi Wu1, Shupin Li, Michal P Ward

  • 1Department of Hypoxic Physiology and Mountain Sickness, High Altitude Medical Research Institute, Xining, Qinghai, People's Republic of China. wutianyiqh@yahoo.com.cn

Wilderness & Environmental Medicine
|April 9, 2005
PubMed
Summary

Tibetan highlanders exhibit superior physiological adaptations for extreme altitudes, including greater maximal oxygen uptake and better sleep quality. These genetic adaptations offer significant advantages for survival and performance on high-altitude expeditions.

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Area of Science:

  • Physiology
  • Altitude Medicine
  • Human Adaptation

Background:

  • Tibetan highlanders have historically inhabited extreme altitudes.
  • Chinese expeditions to Chomolungma (Mt Everest) have provided opportunities to study these populations.
  • Previous observations suggested unique physiological traits in Tibetans at high altitude.

Purpose of the Study:

  • To review and synthesize existing knowledge on the physiological responses of Tibetan highlanders at extreme altitudes.
  • To compare the high-altitude adaptation of Tibetans with Han Chinese lowlanders.
  • To highlight the significance of these adaptations for human survival and performance.

Main Methods:

  • Review of medical and physiological investigations conducted during high-altitude expeditions in Tibet.

Related Experiment Videos

  • Analysis of data from Tibetan mountaineers and Han Chinese lowlanders.
  • Comparison of physiological parameters such as maximal oxygen uptake, lung volumes, and ventilatory responses.

    • Main Results:

    • Tibetans demonstrated higher maximal oxygen uptake, greater ventilation, and more robust hypoxic ventilatory responses compared to Han newcomers.
    • Tibetan highlanders exhibited larger lung volumes, greater diffusing capacities, and improved sleep quality at altitude.
    • Lower incidence of acute mountain sickness and less body weight loss were observed in Tibetans.

    Conclusions:

    • The observed physiological differences in Tibetans at extreme altitudes are likely due to genetic adaptations.
    • These adaptations confer a significant advantage in physical capacity and resilience at high altitude.
    • Understanding these adaptations is crucial for human physiology research and high-altitude exploration.