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Reduction in peak oxygen uptake after prolonged bed restThe hypothesis that the magnitude of the reduction in peak oxygen uptake (VO2) after bed rest is directly proportional to the level of pre-bed rest peak VO2 is tested. Complete pre and post-bed rest working capacity and body weight data were obtained from studies involving 24 men (19-24 years old) and 8 women (23-34 years old) who underwent bed rest for 14-20 days with no remedial treatments. Results of regression analyses of the present change in post-bed rest peak VO2 on pre-bed rest peak VO2 with 32 subjects show correlation coefficients of -0.03 (NS) for data expressed in 1/min and -0.17 for data expressed in ml/min-kg. In addition, significant correlations are found that support the hypothesis only when peak VO2 data are analyzed separately from studies that utilized the cycle ergometer, particularly with subjects in the supine position, as opposed to data obtained from treadmill peak VO2 tests. It is concluded that orthostatic factors, associated with the upright body position and relatively high levels of physical fitness from endurance training, appear to increase the variability of pre and particularly post-bed rest peak VO2 data, which would lead to rejection of the hypothesis.
Document ID
19830047539
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Greenleaf, J. E.
(NASA Ames Research Center Laboratory of Human Environmental Physiology, Moffett Field, CA, United States)
Kozlowski, S.
(Polska Akademia Nauk Warsaw, Poland)
Date Acquired
August 11, 2013
Publication Date
January 1, 1982
Publication Information
Publication: Medicine and Science in Sports and Exercise
Volume: 14
Issue: 6, 19
Subject Category
Aerospace Medicine
Accession Number
83A28757
Distribution Limits
Public
Copyright
Other

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