Four-Hour Dives with Exercise While Breathing Oxygen Partial Pressure of 1.3 ATM.

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Four-Hour Dives with Exercise While Breathing Oxygen Partial Pressure of 1.3 ATM.

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Title: Four-Hour Dives with Exercise While Breathing Oxygen Partial Pressure of 1.3 ATM.
Author: Shykoff, BE
Abstract: The U.S. Navy Diving Manual authorizes divers to breathe oxygen for up to 240 minutes per day at depths of 20 feet of seawater (fsw) or less but does not address the possible accumulation of effects over multiple days. We have conducted experimental four-hour dives with oxygen partial pressure (Po2) of approximately 1.4 atmospheres (atm)2,3 and have concluded that the limit of 240 minutes in 24 hours appears to be acceptable for multiple days if divers are at rest. Still, because the increased ventilatory demands and blood flow to the lungs during underwater exercise may cause pulmonary injury or may increase oxygen-induced injury over those ventilatory demands and blood flows experienced at rest, we tested divers after they had exercised underwater while being exposed to 1.3 atm oxygen for four hours. Although we cannot differentiate oxygen effects from exercise effects with this study, we can examine the combined effects. Testing was conducted as part of the NAVSEA-funded task, Pulmonary Oxygen Toxicity While Swimming: How Exercising Underwater or Using a Rebreather Underwater Breathing Apparatus Affects Pulmonary Function After 1.35 Atm Oxygen Exposures. (Editor note: first paragraph, not author abstract)
Description: Citation Status: Active; Citation Classification: Unclassified; Title Classification: Unclassified; Report Classification: Unclassified; Identifier Classification: Unclassified; Abstract Classification: Unclassified; Distribution Limitation(s): 01 - APPROVED FOR PUBLIC RELEASE; Information provided by the Department of Defense and the Defense Technical Information Center (http://www.dtic.mil/) is considered public information and may be distributed or copied unless otherwise specified. Use of appropriate byline/photo/image credits is requested.
URI: http://archive.rubicon-foundation.org/4985
Date: 2006

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