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Physiological and behavioral effects of tilt-induced body fluid shiftsThis paper addresses the 'fluid shift theory' of space motion sickness. The primary purpose of the research was the development of procedures to assess individual differences in response to rostral body fluid shifts on earth. Experiment I examined inner ear fluid pressure changes during head-down tilt in intact human beings. Tilt produced reliable changes. Differences among subjects and between ears within the same subject were observed. Experiment II examined auditory threshold changes during tilt. Tilt elicited increased auditory thresholds, suggesting that sensory depression may result from increased inner ear fluid pressure. Additional observations on rotation magnitude estimation during head-down tilt, which indicate that rostral fluid shifts may depress semicircular canal activity, are briefly described. The results of this research suggest that the inner ear pressure and auditory threshold shift procedures could be used to assess individual differences among astronauts prior to space flight. Results from the terrestrial observations could be related to reported incidence/severity of motion sickness in space and used to evaluate the fluid shift theory of space motion sickness.
Document ID
19830051467
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Parker, D. E.
(Miami Univ. Oxford, OH, United States)
Tjernstrom, O.
(Miami Univ. Oxford, OH, United States)
Ivarsson, A.
(Miami Univ. Oxford, OH, United States)
Gulledge, W. L.
(Miami Univ. Oxford, OH, United States)
Poston, R. L.
(Miami University Oxford, OH; Lunds Universitet, Malmo, Sweden)
Date Acquired
August 11, 2013
Publication Date
May 1, 1983
Publication Information
Publication: Aviation, Space, and Environmental Medicine
Volume: 54
ISSN: 0095-0562
Subject Category
Aerospace Medicine
Accession Number
83A32685
Funding Number(s)
CONTRACT_GRANT: NAS9-14538
Distribution Limits
Public
Copyright
Other

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