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From: <kirvine@sa*.ne*>
Date: Thu, 09 Dec 1999 10:21:31 -0500
To: "Gliviak, Jozef" <Jozef.Gliviak@co*.co*>
CC: techdiver@aquanaut.com
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

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