Accession Number : ADA180646

Title :   Human Decompression Trial in Nitrogen-Oxygen Diving.

Descriptive Note : Interim rept. Jan 83-Aug 86,

Corporate Author : NAVAL MEDICAL RESEARCH INST BETHESDA MD

Personal Author(s) : Weathersby,P. K. ; Hart,B. L. ; Flynn,E. T. ; Walker,W. F.

Report Date : 26 SEP 1986

Pagination or Media Count : 47

Abstract : A trial was performed to assess the relative risks of oxygen and nitrogen in human no-decompression dives. Dives (n=477) were performed with subjects breathing mixtures with low or high oxygen partial pressures. Dives were 30, 60, or 240 min in duration to various depths chosen by a sequential dose-response format. Despite exceeding the currently accepted safe limite by more than 20%, the incidence of demonstrable DCS was under 3%. Another 3% had ambiguous symptoms. An increase in DCS risk with higher N2 pressure could not be strongly demonstrated. Oxygen had less than half of the DCS risk associated with nitrogen. Keywords: decompression sickness; diving; mathematical modeling; human trial; sequential trial.

Descriptors :   *DECOMPRESSION SICKNESS, BREATHING GASES, DIVING, FORMATS, MATHEMATICAL MODELS, MIXTURES, NITROGEN, OXYGEN, RESPONSE(BIOLOGY), SEQUENCES, SIGNS AND SYMPTOMS, STRESS(PHYSIOLOGY)

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE