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Related Experiment Videos

Mountaineering oxygen mask performance at 4572 m.

D M Hendricks1, N W Pollock, M J Natoli

  • 1Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC 27710, USA.

Aviation, Space, and Environmental Medicine
|November 22, 2000
PubMed
Summary

High-altitude mountaineering masks improve arterial oxygen saturation (SaO2) and mitigate hypoxemia. The Zvezda Enterprise and Duke masks demonstrated superior performance during exercise at simulated high altitudes.

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Area of Science:

  • Altitude Physiology
  • Respiratory Medicine
  • Biomedical Engineering

Background:

  • Supplemental oxygen masks are crucial for high-altitude expeditions to combat hypoxemia.
  • Mask performance is historically undocumented but vital for expedition success.
  • Hypoxemia at high altitudes can cause physiological and cognitive impairment.

Purpose of the Study:

  • To compare the efficacy of three different mountaineering masks.
  • To evaluate mask performance in maintaining arterial oxygen saturation (SaO2) at simulated high altitude.
  • To assess ventilatory responses, SaO2, heart rate, and end-tidal gases under various conditions.

Main Methods:

  • Ten healthy participants (8 males, 2 females) were tested at simulated 0 and 4572m altitude.

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  • Three masks (Life Support Engineering Ltd., Zvezda Enterprise, Duke prototype) were evaluated.
  • Tests included rest and 75W cycle exercise with varying supplemental oxygen flow rates (0, 1.1, 1.7 L/min).

    • Main Results:

    • All tested masks improved SaO2 at high altitude.
    • The Zvezda Enterprise (ZE) and Duke masks were more effective during exercise.
    • ZE and Duke masks maintained mean SaO2 above 90% during exercise at 4572m.

    Conclusions:

    • All three masks offered some protection against physiological changes at 4572m.
    • The ZE and Duke masks exhibited the best performance.
    • Mask design significantly impacts performance, highlighting the need for rigorous evaluation.