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Physiological response to hyper- and hypogravity during rollercoaster flight

R J von Baumgarten, G Baldrighi, H Vogel

    Aviation, Space, and Environmental Medicine
    |February 1, 1980
    PubMed
    Summary
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    This study found that head tilt increases susceptibility to motion sickness during parabolic flights. Individuals tilted forward experienced earlier sickness compared to those upright, highlighting acceleration axis sensitivity.

    Area of Science:

    • Aerospace Medicine
    • Human Physiology
    • Vestibular Science

    Background:

    • Motion sickness is a common issue during aerospace travel.
    • Understanding factors influencing space motion sickness is crucial for astronaut health and mission success.

    Purpose of the Study:

    • To investigate the impact of head position on motion sickness during parabolic weightlessness flights.
    • To correlate vestibular test results with sickness susceptibility in altered gravitational environments.

    Main Methods:

    • 26 healthy males experienced rollercoaster and parabolic weightlessness flights in a Lear jet.
    • Physiological data (eye movements, respiration, blood volume pulse) were recorded.
    • Subjects underwent five laboratory-based vestibular tests, with some flown in upright and others in a 90-degree head-tilted position.

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    Main Results:

    • Subjects with a forward-tilted head reported motion sickness earlier and after fewer maneuvers than upright subjects.
    • Susceptibility to X-axis acceleration changes was higher than to Z-axis acceleration changes.
    • A correlation was observed between subjective vertical estimation, optokinetic nystagmus asymmetries, and rollercoaster sickness.

    Conclusions:

    • Head position significantly influences motion sickness onset during weightlessness simulation.
    • Vestibular function, particularly subjective vertical perception and optokinetic responses, is linked to motion sickness susceptibility in altered gravity.
    • X-axis acceleration poses a greater motion sickness risk than Z-axis acceleration in this context.