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Related Experiment Videos

Body thermal drain under hyperbaric dry heliox environment with undersea excursion dive

H Nakayama

    Journal of Human Ergology
    |December 1, 1978
    PubMed
    Summary

    Deep-sea divers using helium (He) breathing gas experience greater body heat loss due to helium's high thermal conductivity. This increased heat loss is significant during immersion and influenced by environmental factors and diving gear.

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    Area of Science:

    • Hyperbaric physiology
    • Marine biology
    • Diving medicine

    Background:

    • Helium is used in deep-sea diving as a breathing gas substitute for nitrogen due to its low narcotic effect and density.
    • However, helium's high thermal conductivity can lead to significant thermal drain from divers.
    • Voice distortion is another challenge associated with helium's low density.

    Purpose of the Study:

    • To investigate the thermal drain experienced by divers in a hyperbaric helium-oxygen (heliox) environment.
    • To quantify body heat loss under simulated deep-sea diving conditions.
    • To identify factors influencing heat loss during hyperbaric heliox exposure.

    Main Methods:

    • Experiments conducted at the Japan Marine Science and Technology Center since 1972.

    Related Experiment Videos

  • Body heat loss measured using wet pot thermistors and heat flux transducers at 4-7 body surface points.
  • Hyperbaric exposure to 11 ATA (atmospheres absolute) in a dry environment.
  • Measurements taken before, during, and after hyperbaric exposure.

    • Main Results:

    • Body heat loss in a hyperbaric heliox environment was greater than at 1 ATA.
    • Significant additional heat loss occurred during immersion.
    • Ambient water temperature, diving suit type, and underwear influenced heat loss.

    Conclusions:

    • Helium-based breathing gas increases the risk of hypothermia for deep-sea divers.
    • Divers experience greater heat loss in heliox environments, especially during immersion.
    • Mitigating thermal drain requires careful consideration of environmental conditions and protective diving suits.