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Effects of antiorthostatic bedrest on the cardiorespiratory responses to exerciseThe cardiorespiratory changes in exercise performance induced by horizontal and antiorthostatic bed rest are compared in order to determine the physiological changes occurring in the antiorthostatic position and their degree of similarity to those observed in weightlessness. Systolic and diastolic pressures, heart rates, maximum oxygen uptake, ventilation volume during and following 5 min of submaximal exercise in the supine position and body weight and composition were determined in subjects before and following 7 days of bed rest in the horizontal or 6-deg head-down positions. Bed rest is found to result in a general decrease in exercise tolerance as indicated by cardiorespiratory parameters in both groups, with the 6-deg head-down treatment causing greater cardiovascular deconditioning. When compared with space flight data, the antiorthostatic position is shown to simulate the effects of weightlessness more effectively than horizontal bed rest
Document ID
19810047140
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Convertino, V. A.
(NASA Ames Research Center Moffett Field, CA, United States)
Bisson, R.
(NASA Ames Research Center Moffett Field, CA, United States)
Bates, R.
(NASA Ames Research Center Moffett Field, CA, United States)
Goldwater, D.
(NASA Ames Research Center Moffett Field, CA, United States)
Sandler, H.
(NASA Ames Research Center Biomedical Research Div., Moffett Field, Calif., United States)
Date Acquired
August 11, 2013
Publication Date
April 1, 1981
Subject Category
Aerospace Medicine
Accession Number
81A31544
Distribution Limits
Public
Copyright
Other

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