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Related Experiment Videos

Body volume changes during simulated microgravity: auditory changes, segmental fluid redistribution, and regional

L D Montgomery1, A J Parmet, C R Booher

  • 1LDM Associates, San Jose, CA.

Annals of Biomedical Engineering
|July 1, 1993
PubMed
Summary

Space adaptation syndrome (SAS) involves fluid shifts, but this study found no significant auditory changes despite symptoms. Auditory function remained stable during simulated microgravity, suggesting the inner ear is not affected by cephalad fluid shifts.

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Area of Science:

  • Space Medicine
  • Neuroscience
  • Auditory Physiology

Background:

  • Space adaptation syndrome (SAS) causes nausea and disorientation due to fluid shifts.
  • The etiology of SAS is unclear, with theories linking it to vestibular system changes.
  • Vestibular dysfunction can affect cochlear function, prompting investigation into auditory effects.

Purpose of the Study:

  • To investigate the relationship between cephalad fluid redistribution and auditory system changes.
  • To assess auditory function during simulated microgravity induced by antiorthostatic bed rest.
  • To determine if fluid shifts associated with SAS impact hearing or related neural pathways.

Main Methods:

  • Utilized manual and bone audiometry, impedance tympanometry, and brain-stem evoked potentials.

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  • Monitored auditory changes before, during, and after -6 degrees head-down tilt.
  • Employed impedance plethysmography to measure fluid shifts and hemodynamic changes.

    • Main Results:

    • Significant cephalad fluid shifts and intracranial congestion occurred.
    • Subjects exhibited symptoms consistent with space adaptation syndrome (SAS).
    • No clinically significant alterations in auditory system function were detected.

    Conclusions:

    • Despite cephalad fluid shifts and SAS symptoms, the auditory system appears unaffected by short-term simulated microgravity.
    • The study suggests that the auditory system's function is robust against acute fluid redistribution.
    • Further research may explore longer-duration exposure or different physiological parameters.