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Hello, Mom? Breathhold diving - read it again. If you start with 1 ata nitrogen pressure, and then raise the pressure with oxygen only, where the fuck do you think the nitrogen is going? Come on, give me a break. On the other hand, it is true that coming the other way, from higher nitrogen pressure, you reach a point where elevated PPO2 will do nothing further per time unit worth your while relative to lowering the surrounding pressure as far as nitrogen elimination. We found that one out in WKPP a long time ago and thus cap our oxygen exposure times accordingly for better deco ( you can replace the word nitrogen with helium). From: "David Reinhard" <reinhard@oc*.co*.au*> To: <techdiver@aquanaut.com> Sent: Monday, October 16, 2000 6:55 AM Subject: Nitrogen elimination and oxygen > I found the following snippet in the Diving Medicine Online Newsletter. I > know nothing more about this than what I have reproduced below. Does anyone > have any further info or knowledge about this research, or the references > quoted??? > This seems to be challenging one of the fundamental principles of using > high O2 mixes...I would like to know more!! > > Dave. > > " Dr. Claes E. G. Lundgren from the Department of Physiology at the State > University of New York at Buffalo has done extensive research on the diving > physiology of breath-hold diving and decompression sickness. Here are some > interesting findings: > > The common treatment of oxygen breathing during decompression should be > performed at the lowest possible ambient pressure. Dr. Lundgren and his > team found that nitrogen elimination decreased as inhaled oxygen pressure > went up. What does this bode for 'Nitrox' diving? > > > References; > Anderson, D., G. Nagasawa, W. Norfleet, A. Orszowka, and C.E.G. Lundgren. > 1991. O2 pressures between 0.12 and 2.5 atm abs, circulatory function, and > N2 elimination. Undersea Biomedical Research 18(4): 279-292. > > Anderson, D.J. George, and C.E.G. Lundgren 1993. Moderate hypercapnia: > cardiovascular function and nitrogen elimination. Undersea & Hyperbaric > Medicine 20(3): 225-232. " > > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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