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Abstract:
U.S. Navy divers performed multiple experimental four-hour resting dives while breathing 100% O2 underwater at a partial pressure of 1.35 atm. Eighteen divers completed two dives with a surface interval of 44 hours. 17 completed two dives with a surface interval of 20 hours. and 16 completed five dives with surface intervals of 20 hours. Pulmonary function and symptoms were monitored before. between. and after the dives. and visual acuity was monitored during and after the series of five dives. In all cases. diverse experienced a scattering of mild pulmonary symptoms or changes in pulmonary function. but no cumulative injurious effects could be seen. Recovery of pulmonary function and resolution of symptoms occurred during dives. The most severe symptoms were reported after the first of two dives, while the most severe pulmonary function change. which was asymptomatic. was seen 20 hours after the fourth dive. Only one minor change in refraction occurred, one of fl.25 diopters measurable three days after the fifth dive and persisting for about one week. Although even single four-hour dives at P02 = 1.35 atm entail some risk of pulmonary injury. repeated dives wtth surface intervals of 20 hours for up to five days do not appear to be more damaging.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Technical rept. Jul 2003-Jan 2004 |
| Pages: |
21 |
| Report Date: |
JUL 2004 |
| Report Number: |
A329244 |
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