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Inflight Exercise Regimen for the 2-Hour Prebreathe ProtocolA 10 min aerobic prebreathe exercise up to 75% V-O2(sub max) on a dual-cycle ergometer, included in the 2-hour prebreathe protocol, has been shown to dramatically reduce the incidence of decompression sickness (DCS) at altitude. In-flight only leg ergometry will be available. A balanced exercise was developed using surgical tubing with the ergometer on-orbit. We hypothesize that a 75% V02max workload, individually prescribed, would be achieved using a target heart rate to regulate the intensity of the arm exercise. VO2, heart rate (HR) / ECG, V-CO2 /V-O2, V(sub E), and V(sub T), and rate of perceived exertion (Borg scale) were measured in eleven healthy subjects who passed a US Air Force Class III Physical examination. A V-O2 peak test was performed to assess the sub-maximal exercise prescription. Two series of sub-maximal tests were performed: (1) leg ergometer/hand ergometer and (2) leg ergometer/surgical tubes. We found no significant differences (P > 0.05) in comparing the means for V-O2 and HR between the predicted and measured values during the final 4 minute-stage at "75% V-O2 workload" or between the two types of sub-maximal tests. The prescribed prebreathe sub-maximal exercise performed with flight certified surgical tubes was achieved using the target HR.
Document ID
20000094523
Acquisition Source
Johnson Space Center
Document Type
Preprint (Draft being sent to journal)
Authors
Foster, Philip P.
(National Space Biomedical Research Inst. Houston, TX United States)
Gernhardt, Michael L.
(NASA Johnson Space Center Houston, TX United States)
Woodruff, Kristin K.
(Wyle Labs., Inc. United States)
Schneider, Susan M.
(NASA Johnson Space Center Houston, TX United States)
Homick, Jerry L.
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Aerospace Medicine
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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