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Energy absorption, lean body mass, and total body fat changes during 5 weeks of continuous bed restThe nature of the body composition changes due to inactivity was examined together with the question of whether these changes are secondary to changes in energy absorption. Volunteers were 15 healthy males who lived on a metabolic research ward under close staff supervision for 11 weeks. Subjects were ambulatory during the first six weeks and remained in continuous bed rest for the last five weeks of the study. Six male volunteers (age 24-61 years) were selected for body composition measurements. Nine different male volunteers (age 21-50 years) were selected for energy absorption measurements. The volunteers were fed weighed conventional foods on a constant 7-d rotation menu. The average daily caloric content was 2,592 kcal. Comparing the five weeks of continuous bed rest with the previous six weeks of ambulation, it was observed that there was no change in energy absorption or total body weight during bed rest, but a significant decrease in lean body mass and a significant increase in total body fat (p less than 0.05).
Document ID
19900043529
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Krebs, Jean M.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Evans, Harlan
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Kuo, Mike C.
(NASA Johnson Space Center; Krug International Corp. Houston, TX, United States)
Schneider, Victor S.
(Texas, University Houston, United States)
Leblanc, Adrian D.
(Baylor College of Medicine Houston, TX, United States)
Date Acquired
August 14, 2013
Publication Date
April 1, 1990
Publication Information
Publication: Aviation, Space, and Environmental Medicine
Volume: 61
ISSN: 0095-6562
Subject Category
Aerospace Medicine
Accession Number
90A30584
Funding Number(s)
CONTRACT_GRANT: NIH-RR-00350
CONTRACT_GRANT: NIH-RR-02558
Distribution Limits
Public
Copyright
Other

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