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Effect of orthostatic stress on exercise performance after bedrestThe cardiorespiratory responses to supine against upright exercise were compared to determine the orthostatic effects of gravity on exercise performance following bedrest. Five healthy male subjects underwent seven days of continuous bedrest. A deconditioning effect was manifested by significant increases in ventilation volume, carbon dioxide production, respiratory exchange ratio, heart rate, heart rate-pressure product, and diastolic blood pressure during submaximal exercise following bedrest. The major finding from this study was that bedrest resulted in a general decrease in exercise tolerance, which was more stressful in the upright posture compared to the supine position, judging from specific submaximal cardiorespiratory responses to cycle ergometry. The data support the hypothesis that there is an orthostatic factor to the reduction in work tolerance following bedrest deconditioning, in addition to the effects caused by increased physical activity.
Document ID
19820052372
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Convertino, V. A.
(NASA Ames Research Center Moffett Field, CA, United States)
Goldwater, D. J.
(NASA Ames Research Center Moffett Field, CA, United States)
Sandler, H.
(NASA Ames Research Center Biomedical Research Div., Moffett Field, CA, United States)
Date Acquired
August 10, 2013
Publication Date
July 1, 1982
Subject Category
Aerospace Medicine
Accession Number
82A35907
Distribution Limits
Public
Copyright
Other

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