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Potential benefits of maximal exercise just prior to return from weightlessnessThe purpose of this study was to determine whether performance of a single maximal bout of exercise during weightlessness within hours of return to earth would enhance recovery of aerobic fitness and physical work capacities under a 1G environment. Ten healthy men were subjected to a 10-d bedrest period in the 6-deg headdown position. A graded maximal supine cycle ergometer test was performed before and at the end of bedrest to simulate exercise during weightlessness. Following 3 h of resumption of the upright posture, a second maximal exercise test was performed on a treadmill to measure work capacity under conditions of 1G. Compared to before bedrest, peak oxygen consumption, V(O2), decreased by 8.7 percent and peak heart rate (HR) increased by 5.6 percent in the supine cycle test at the end of bedrest. However, there were no significant changes in peak V(O2) and peak HR in the upright treadmill test following bedrest. These data suggest that one bout of maximal leg exercise prior to return from 10 d of weightlessness may be adequate to restore preflight aerobic fitness and physical work capacity.
Document ID
19870056818
Document Type
Reprint (Version printed in journal)
Authors
Convertino, Victor A. (NASA Kennedy Space Center; Bionetics Corp. Cocoa Beach, FL, United States)
Date Acquired
August 13, 2013
Publication Date
June 1, 1987
Publication Information
Publication: Aviation, Space, and Environmental Medicine
Volume: 58
ISSN: 0095-6562
Subject Category
AEROSPACE MEDICINE
Distribution Limits
Public
Copyright
Other