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Electronystagmography and audio potentials in space flight.

W E Thornton, W P Biggers, W G Thomas

    The Laryngoscope
    |August 1, 1985
    PubMed
    Summary
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    Objective measurements of inner ear function in space revealed normal results for space motion sickness (SMS) using electronystagmography and auditory brain stem response, with two ENG records unexplained.

    Area of Science:

    • Aerospace Medicine
    • Neuroscience
    • Human Physiology

    Background:

    • Space motion sickness (SMS) is a common challenge for astronauts.
    • Understanding the origin of SMS is crucial for crew health and mission success.
    • Previous research faced limitations due to mission constraints.

    Purpose of the Study:

    • To objectively characterize space motion sickness (SMS).
    • To determine if SMS originates from peripheral or central vestibular systems.
    • To evaluate inner ear function in microgravity.

    Main Methods:

    • Utilized objective measurements of inner ear function during spaceflights (STS-4 onwards).
    • Employed electronystagmography (ENG) and auditory brain stem response (ABR) recordings.

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  • Incorporated direct observations from a mission specialist on STS-8.

    • Main Results:

    • Most ENG and all ABR recordings in microgravity were normal.
    • Two ENG records showed abnormalities that require further investigation.
    • Personal observations provided valuable insights into SMS.

    Conclusions:

    • Objective tests suggest the vestibular system may not be the primary source of SMS in most cases.
    • Further research is needed to explain the abnormal ENG findings.
    • Integrated objective data with subjective astronaut experiences for a comprehensive understanding.