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Exercise load index and changes in body weight during long-duration confinement in an isolated environmentPURPOSE: 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.
Document ID
20040087748
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kraft, Norbert O.
(NASA Ames Research Center Moffett Field CA United States)
Lyons, Terence J.
Binder, Heidi
Inoue, Natsuhiko
Ohshima, Hiroshi
Sekiguchi, Chiharu
Date Acquired
August 21, 2013
Publication Date
April 1, 2003
Publication Information
Publication: Aviation, space, and environmental medicine
Volume: 74
Issue: 4
ISSN: 0095-6562
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other

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