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Hyperventilation in a motion sickness desensitization program.

Agali Mert1, Willem Bles, Suzanne A E Nooij

  • 1Royal Netherlands Air Force, Eindhoven, The Netherlands. a.mert@dehoogstraat.nl

Aviation, Space, and Environmental Medicine
|June 2, 2007
PubMed
Summary
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Repetitive trunk movements causing Coriolis effects do not induce significant physiological changes linked to motion sickness. Hyperventilation alone did not cause nausea, suggesting it

Area of Science:

  • Vestibular system research
  • Human physiology
  • Motion sickness etiology

Background:

  • Motion sickness desensitization often uses Coriolis effects from trunk movements on a rotating chair.
  • Respiratory relaxation techniques are used, prompting investigation into trunk movements' role in hyperventilation and nausea.

Purpose of the Study:

  • To investigate if repetitive trunk movements alone can induce hyperventilation.
  • To determine if induced hyperventilation contributes to motion sickness during Coriolis effect exposure.

Main Methods:

  • 12 healthy subjects participated in four conditions: Baseline, voluntary hyperventilation, trunk tilting on a stationary chair (Tilt-Stat), and trunk tilting on a rotating chair (Tilt-Rot).
  • Respiratory and cardiovascular parameters (heart frequency, tidal volume, end-tidal CO2, respiration frequency) were measured.

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Main Results:

  • Nine out of 12 subjects stopped the Tilt-Rot condition due to nausea.
  • No significant physiological differences were found between Tilt-Stat/Tilt-Rot and Baseline, except for heart rate in Tilt-Rot.
  • Significant physiological differences were observed during voluntary hyperventilation, but without nausea.

Conclusions:

  • Hyperventilation is not the primary cause of nausea induced by Coriolis effects.
  • Routine measurement of respiratory and cardiovascular parameters is unnecessary in Coriolis-based desensitization programs.
  • In non-responsive individuals, monitoring respiratory parameters is advised due to potential for individual hyperventilation.