Document Detail

Motion sickness with combined fore-aft and pitch oscillation: effect of phase and the visual scene.
MedLine Citation:
PMID:  19911518     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The view ahead influences the motion sickness of car passengers but has been found to have little influence on the sickness caused by low frequency fore-and-aft oscillation. Acceleration and deceleration of vehicles is accompanied by pitch motions that may influence sickness. HYPOTHESES: It was hypothesized that: (1) a visual scene would influence sickness caused by combined fore-and-aft and pitch oscillation; and (2) sickness would be dependent on the phase between the fore-and-aft oscillation and the pitch oscillation. METHOD: While viewing one of three visual scenes (internal view, blindfold, or external view), 6 groups of 20 subjects were exposed for 30 min to 1 of 2 motions (in-phase or out-of-phase combinations of 0.1 Hz fore-and-aft and pitch oscillation). The 0.1-Hz fore-and-aft oscillation at +/- 1.26 ms(-2) rms (displacement of +/- 3.18 m) was combined with +/- 3.69 degrees pitch oscillation either in phase (so the pitch increased acceleration in the plane of the seat to +/- 1.89 ms(-2)) or out of phase (to reduce acceleration to +/- 0.63 ms(-2)). RESULTS: With both types of motion (in-phase and out-of-phase oscillation) there was significantly less sickness with an external view than with an internal view or a blindfold. There was evidence of an interaction between the effects of viewing condition and the effect of the phase between the fore-and-aft and the pitch oscillation consistent with blindfolded subjects experiencing less sickness when they experienced greater forces. CONCLUSIONS: Motion sickness caused by combined fore-and-aft and pitch oscillation depends on both the visual scene and the phase between the fore-and-aft and pitch motions. The minimization of sickness arising from such motions should involve the optimization of both the visual environment and the phase.
Colleen Butler; Michael J Griffin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  80     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-11-16     Completed Date:  2009-12-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  946-54     Citation Subset:  IM; S    
Human Factors Research Unit, Institute of Sound and Vibration Research, University of Southampton, Southampton, England.
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MeSH Terms
Motion Sickness / etiology*
Visual Fields*
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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