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Bill Mayne > > Dave Story > > > > This is not my definition of "oxygen window." The oxygen window is > > the "inherent unsaturation" of the tissues brought about by the > > consumption of O2 in the metabolic process. [...] > > The Jan/Feb '93 issue of Alert Diver has an article on the oxygen > window by Richard Vann, Ph.D. A highlighted part on page 15 reads: Dr. Vann is using "oxygen window" to mean something different than appears in most texts, such as _Physiology and Medicine of Diving_. > "[...] This gradient between > nitrogen in the bubble and in tissue is known as the oxygen window." I always thought that was the "nitrogen gradient" or "bubble gradient." The "window" I referred to was one created by metabolism, not by a simple gas gradient. > "In repetitive diving, this might lead to an accumulation of > inert gas not expected by a Haldane decompression model which > assumes gas to remain dissolved." > > John Crea's modification of the Buhlmann model attempts to > compensate for this by using longer halftimes for tissues > which are off-gassing. He's not alone: Capt. E.D. Thalmann the US Navy has been doing this for quite a while (E-L models) as have others. Even John Lewis' computers use an asymmetric E-E model (fast tissues (<60min) offgas at 60min rate once on the surface.) What has John Crea done? Multiply the offgassing halftimes by some constant factor? Cheers, David Story NAUI AI Z9588, PADI DM 43922, EMT story@be*.wp*.sg*.co* Every dive is a decompression dive.
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