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So, excuse me if I state the obvious, what I am getting from all this is that He comes on and off faster, and with less cellular damage, but, it bubbles deeper and faster than N2. So, deeper stops are needed to keep the bubbles from *starting*, and then the shallower, longer ones are to keep bubbles from *growing.* Taken as a whole, with the proper medical support, (99% of us aren't going to have) overall deco times can be substantially reduced. A little longer deeper, and a slower ascent, shorter shallow, and the last 20 *real* slow for an overall reduction of time as compared to Buhlmann data. The rate that this all happens at is, I imagine, *very* diver specific. Once bubbles form, will He allow them to exit through your lungs more quickly than N2? Do you ever notice "different" days, where, perhaps all gear, gas and time factors were the same, but you didn't feel so good as another day? Scott ----- Original Message ----- From: <kirvine@sa*.ne*> To: "Gliviak, Jozef" <Jozef.Gliviak@co*.co*> Cc: <techdiver@aquanaut.com> Sent: Thursday, December 09, 1999 7:21 AM Subject: Re: decompresion gas selection and procedures > Jozef, Jarrod and Bill Mee started this one to reduce the obvious > loading of nitrogen over these long exposures. > > For the deeper gas, I started it to prevent the damgage caused by high > partial pressures of nitrogen in the absence of helium, and the obvious > problem of being on a narcotic gas during a critical phase of > decompression.I jsut made that a standard of WKPP without even testing > it because it is so obvious. Keep in mind that we spend more time > decompressing below 190 feet than most peole will ever have in bottom > time at that dpeth unless they are commercial divers. > > We discovered by experiment that we were getting cleaner decos and fewer > subclinical symptoms when helium was introduced into the deco gasses, > and the first thing we noticed is that we just plain felt better. > > I then went ahead and tried shortening the decos with these gases, and > that worked even better. We then were able to change the shape of the > decos and to shorten the oxygen time dramaticly. > > JJ and Bill then went to heliox for the bottom gas, and JJ went to > helium in all of his deco gases other than the oxygen. Bill Mee then > went to all heliox for everything but the oxygen. I just converted to > trimix in the 120 bottle now, but have not gone to it in the 70 bottle. > I do use trimix in all of my bottom mixes, however , no matter how > shallow. > > We do this in staggeered stages like this - Bill, JJ and I all doing > slightly different gases - to slowly make the comparisons and changes. > Then the other guys start introducing it. We use blood tests, doppler, > and the usual subjective tests to determine the outcomes. > > JJ is real busy with his agency ( GUE ), diving with me, and the TV > shows we are making right now, Bill is taking his company public so is > too busy to talk now, and I have basicly nothing to do for the rest of > the year due to the Y2K holdoff but dive and waste my time on here, so > ask anything you like. > > > Gliviak, Jozef wrote: > > > > Guys, > > > > We will agree that WKPP proved that using Trimix50/25 > > instead Nitrox50 works, and it doesn't make your deco > > longer as Buhlmann algorithm is telling us. > > We will agree that this experimental findings do not correspond > > with teories on which Buhlmann algorithm, used in most > > current dive planners, is based. > > > > And definitly we would like to know why WKPP guys > > started doing this. They must have some kind of reason > > behind. > > > > So it's George's turn now. Can you tell us how did > > you came to this ? > > > > Best regards > > > > Jozef Gliviak > > Slovakia > > -- > 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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