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Motion sickness susceptibility in parabolic flight and velocity storage activityIn parabolic flight experiments, postrotary nystagmus is as found to be differentially suppressed in free fall (G) and in a high gravitoinertial force (1.8 G) background relative to 1 G. In addition, the influence of postrotary head movements on nystagmus suppression was found to be contingent on G-dependency of the velocity storage and dumping mechanisms. Here, susceptibility to motion sickness during head movements in 0 G and 1.8 G was rank-correlated with the following: (1) the decay time constant of the slow phase velocity of postrotary nystagmus under 1 G, no head movement, baseline conditions, (2) the extent of time constant reduction elicited in 0 G and 1.8 G; (3) the extent of time constant reduction elicited by head tilts in 1 G; and (4) changes in the extent of time constants reduction in 0 G and 1.8 G over repeated tests. Susceptibility was significantly correlated with the extent to which a head movement reduced the time constant in 1 G, was weakly correlated with the baseline time constant, but was not correlated with the extent of reduction in 0 G or 1.8 G. This pattern suggests a link between mechanisms evoking symptoms of space motion sickness and the mechanisms of velocity storage and dumping. Experimental means of evaluating this link are described.
Document ID
19910046816
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dizio, Paul
(Brandeis Univ. Waltham, MA, United States)
Lackner, James R.
(Brandeis University Waltham, MA, United States)
Date Acquired
August 14, 2013
Publication Date
April 1, 1991
Publication Information
Publication: Aviation, Space, and Environmental Medicine
Volume: 62
ISSN: 0095-6562
Subject Category
Aerospace Medicine
Accession Number
91A31439
Funding Number(s)
CONTRACT_GRANT: NAS9-15147
CONTRACT_GRANT: NAG9-295
Distribution Limits
Public
Copyright
Other

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