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Effect of hypobaric hypoxia on auditory sensitivity.

Ken I McAnally1, Dougal B Watson, Russell L Martin

  • 1Air Operations Division, Defence Science and Technology Organisation, Melbourne, Victoria, Australia. ken.mcanally@dsto.defence.gov.au

Aviation, Space, and Environmental Medicine
|December 25, 2003
PubMed
Summary
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Hypobaric hypoxia caused a small reduction in auditory sensitivity at 3700 meters. This 2.57 dB decrease in hearing is unlikely to significantly impact communication effectiveness.

Area of Science:

  • Auditory Neuroscience
  • Aerospace Medicine
  • Human Physiology

Background:

  • Previous research on hypobaric hypoxia and hearing is limited by ambient pressure considerations.
  • Auditory sensitivity studies require careful control of stimulus levels relative to ambient pressure.

Purpose of the Study:

  • To compare auditory sensitivity under hypoxic and normoxic conditions at a simulated altitude of 3700 m.
  • To isolate the effects of hypoxia on hearing, controlling for other barometric pressure effects.

Main Methods:

  • Auditory sensitivity to 1, 8, 12, and 16 kHz tones was tested.
  • Hypoxic condition: inspired oxygen decreased with altitude.
  • Normoxic condition: inspired oxygen maintained at sea level equivalent, controlling for barometric pressure effects.

Related Experiment Videos

Main Results:

  • A mean reduction in auditory sensitivity of 2.57 dB was observed across tested frequencies.
  • This reduction occurred under simulated altitude conditions.

Conclusions:

  • The observed reduction in auditory sensitivity due to hypobaric hypoxia is minimal.
  • This level of hearing change is not expected to significantly impair auditory information transfer.