POTENTIAL BENEFITS OF MAXIMAL EXERCISE JUST PRIOR TO RETURN FROM WEIGHTLESSNESS

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  • 1 June 1987
    • journal article
    • research article
    • Vol. 58  (6) , 568-572
Abstract
The 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 (36-51 yr) underwent maximal supine exercise followed by upright maximal exercise before and after a 10-d bedrest period in the 6.degree. 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 from the supine exercise test, a second maximal exercise test was performed on a treadmill to measure work capacity under conditions of 1G. Compared to before bedrest, peak .ovrhdot.VO2 decreased (p < 0.05) by 8.7% and peak HR increased (p < 0.05) by 5.6% in the supine cycle test at the end of bedrest. However, there were no significant changes in peak .ovrhdot.VO2 and peak HR in the upright treadmill test following bedrest. These data, based on a simulation, 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.