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A predictive test for space motion sickness

C H Markham1, S G Diamond

  • 1Department of Neurology, UCLA School of Medicine 90024-1769.

Journal of Vestibular Research : Equilibrium & Orientation
|January 1, 1993
PubMed
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Astronauts experiencing space motion sickness (SMS) showed increased ocular torsional disconjugacy in altered gravity. This eye torsion response persisted and was linked to otolith asymmetry, suggesting a need for more testing to predict SMS.

Area of Science:

  • Aerospace Medicine
  • Neuroscience
  • Ophthalmology

Background:

  • Space motion sickness (SMS) is a common challenge for astronauts.
  • Understanding the physiological basis of SMS is crucial for mission success.
  • Ocular torsion, or eye twisting, is a potential indicator of vestibular system changes.

Purpose of the Study:

  • To investigate the relationship between SMS history and ocular torsion.
  • To examine ocular torsion responses during altered gravity exposure.
  • To explore the underlying mechanisms of ocular torsion and SMS.

Main Methods:

  • 13 astronaut subjects were tested during parabolic flights (0 G and 1.8 G).
  • Ocular torsion was measured during repeated exposures to altered gravitational states.

Related Experiment Videos

  • Subjects with and without a history of SMS were compared.

    • Main Results:

    • A strong link was found between a history of SMS and ocular torsional disconjugacy in novel gravitational states.
    • Ocular torsional disconjugacy scores increased with greater exposure to 0 G and 1.8 G.
    • Responses remained consistent in subjects retested after one year.

    Conclusions:

    • Otolith asymmetry, compensated in 1 G, may become unmasked in altered gravity, causing ocular torsion and SMS.
    • Repeated torsional studies are necessary to accurately predict SMS.
    • Findings highlight the vestibular system's role in space adaptation and motion sickness.