A New Preoxygenation Procedure for Extravehicular Activity (EVA)
WYLE LABS LIFE SCIENCES AND SERVICES INC SAN ANTONIO TX
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A 10.2 psi staged-decompression schedule camp-out procedure or a 4-hour preoxygenation at 14.7 psi is required prior to extravehicular activity EVA to reduce decompression sickness DCS risk. Results of recent research at the Armstrong Laboratory showed that a 1-hour resting preoxygenation followed by a 4-hour 4.3 psi exposure resulted in 77 DCS risk N26, while the same profile beginning with 10 min of exercise at 75 of VO2peak during preoxygenation reduced the DCS risk to 42 P.03 N26. A 4-hour preoxygenation without exercise followed by the 4.3 psi exposure resulted in 46 DCS risk N28 preliminary. The 1-hour preoxygenation with exercise and the 4-hour preoxygenation without exercise results were not significantly different. Elimination of either 3 hours of preoxygenation or 12 hours of staged-decompression are compelling reasons to consider incorporation of exercise-enhanced preoxygenation.
- Medicine and Medical Research
- Stress Physiology