Moderate Exercise After Altitude Exposure Fails to Induce Decompression Sickness
Journal article, Dec 1998-Dec 2000
WYLE LABS LIFE SCIENCES AND SERVICES INC SAN ANTONIO TX
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The objective of this study was to determine the effect of exercise after altitude exposure post-exposure exercise on subsequent altitude decompression sickness DCS incidence. Existing USAF prohibition of exercise following altitude chamber training exposures and interest from operational personnel prompted our evaluation of post-exposure exercise as a DCS-inducing stressor. Methods After a 1-h resting preoxygenation, 67 subjects were exposed to 30,000 ft for 2-h while performing mild, upper body exercise. The subjects were monitored for venous gas emboli VGE with an echo-imaging system and observed for signs and symptoms of DCS. Subjects without DCS N31 or with DOS which resolved during recompression N29 were randomly assigned to post-exposure rest control, N29 or moderate exercise 50 of peak oxygen uptake, dual-cycle ergometry N31 and both groups were monitored for delayed or recurring DOS. Results. The altitude exposure resulted in 48.3 DOS in the 60 volunteers serving as test or control subjects. Of 31 subjects assigned to the post-exposure exercise group, 15 had developed DOS which resolved during descent. No cases of DOS were observed or reported during or following post-exposure exercise. The results show that moderate exercise after exposure did not result in either delayed-onset or recurring DOS.
- Stress Physiology