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Actually, this has been known for some time. When it is time to move from one deco stop to the next, hanging out at the deeper stop gives diminishing returns. Screaming instantly from the bottom to a total vacuum would give the fastest offgassing of all, although there is the issue of getting bent, and that is the whole point of deco stops. Nitrox is a non-issue since I would expect excessive oxygen pressure to prevent _any_ gas from leaving the tissues. Note the quote uses the term "oxygen pressure" and does not use the term "percent oxygen." Don Burke Chesapeake, Virginia ----- Original Message ----- From: David Reinhard <reinhard@oc*.co*.au*> To: <techdiver@aquanaut.com> Sent: 16 October, 2000 06:55 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'. > _____NetZero Free Internet Access and Email______ http://www.netzero.net/download/index.html -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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