Document Detail


Exercise load index and changes in body weight during long-duration confinement in an isolated environment.
MedLine Citation:
PMID:  12688454     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: The objectives of this project were to investigate exercise load and body weight related to long-duration confinement in a closed environment simulating ISS flight conditions, and to evaluate subjects' motivation to continue the experiment and their adaptation to isolation. METHODS: Four Russian male subjects participated in a 240-d experiment (Group I), and four subjects (three male subjects and one female subject) from Austria, Canada, Japan, and Russia participated in a 110-d experiment (Group II). Exercise load was estimated during confinement using a modified Rating of Perceived Exertion scale. Free reports were used to determine subjects' motivation. Body weight was measured before, during, and after confinement. RESULTS: Group I achieved their lowest exercise loads during their first month of isolation; problems with adaptation to the isolation environment were also reported during this first month. Group II exercise load was significantly lower in the second month due to crewmember problems; loss of motivation could be noted from their free reports. The subject with the lowest exercise load retired from the isolation experiment earlier than scheduled. Exercise load was not correlated with prior exercise habits. Significant differences in body weight was observed between group I and II and between Russian and non-Russian subjects. One subject in Group I experienced a significant increase in his body weight. CONCLUSION: Exercise load may be a good indicator for adaptation problems and motivation changes in closed environments. Immobility, lack of space, and smoking cessation in general did not induce significant body weight changes.
Authors:
Norbert O Kraft; Terence J Lyons; Heidi Binder; Natsuhiko Inoue; Hiroshi Ohshima; Chiharu Sekiguchi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  74     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  2003 Apr 
Date Detail:
Created Date:  2003-04-11     Completed Date:  2003-07-02     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  348-53     Citation Subset:  IM; S    
Affiliation:
Human Factors Research and Technology, NASA Ames Research Center, Moffett Field,CA 94035-1000, USA. nkraft@mail.arc.nasa.gov
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological
Adult
Body Weight*
Exercise / physiology*
Humans
Immobilization
Male
Middle Aged
Motivation
Smoking Cessation
Space Flight*
Space Simulation*
Time Factors

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


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