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Recovery of postural equilibrium control following spaceflightDecreased postural stability is observed in most astronauts immediately following spaceflight. Because ataxia may present postflight operational hazards, it is important to determine the incidence of postural instability immediately following landing and the dynamics of recovery of normal postural equilibrium control. It is postulated that postflight postural instability results from in-flight adaptive changes in central nervous system (CNS) processing of sensory information from the visual, vestibular, and proprioceptive systems. The purpose of the present investigation was to determine the magnitude and time course of postflight recovery of postural equilibrium control and, hence, readaptation of CNS processing of sensory information. Thirteen crew members from six spaceflight missions were studied pre- and postflight using a modified commercial posturography system. Postural equilibrium control was found to be seriously disrupted immediately following spaceflight in all subjects. Readaptation to the terrestrial environment began immediately upon landing, proceeded rapidly for the first 10-12 hours, and then proceeded much more slowly for the subsequent 2-4 days until preflight stability levels were reachieved. It is concluded that the overall postflight recovery of postural stability follows a predictable time course.
Document ID
20050000688
Document Type
Reprint (Version printed in journal)
Authors
Paloski, W. H. (Inc. Houston, Texas 77058)
Reschke, M. F.
Black, F. O.
Doxey, D. D.
Harm, D. L.
Date Acquired
August 22, 2013
Publication Date
May 22, 1992
Publication Information
Publication: Annals of the New York Academy of Sciences
Volume: 656
ISSN: 0077-8923
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: DC-00205
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Neuroscience
Non-NASA Center
NASA Center JSC