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    You guys might not be optimizing your deco if you stay on O2 for 25
minutes.  While the O2 will push gases into the circulatory system,
constricting the vascular system will back things up.  You need to
understand the balancing act to optimize the total decompression.

    As well you are probably building up a potent amount of hydrogen
peroxidase in the brain thus putting you much closer to a hyperoxic siezure.

    Some of us feel that doing O2 for 16-18 minutes and back gas for about
6-8 minutes is benificial.  This has shown to possibly reset the clock a bit
as well.

      Part 2:   the off effect.

     John


----- Original Message -----
From: Gliviak, Jozef <Jozef.Gliviak@co*.co*>
To: 'Sean T. Stevenson' <ststev@un*.co*>
Cc: <techdiver@aquanaut.com>
Sent: Tuesday, December 07, 1999 1:34 AM
Subject: RE: decompresion gas selection and procedures


> Hello Sean,
>
> >Something like 5 minutes every 25, and they need to be to the
> > LOWEST breathable PPO2 gas, ie. bottom mix.
> >Do not add time to your stops to accomodate these (Air) breaks.
> Sorry, just to make sure I understand well .Which option do you use
> if your software tells you to do e.g 40min deco on O2:
> 1. you actualy do 25on O2, then 5 on low PpO2 gas and 10 on O2 - Total 40
> min.
> 2. or 25 on O2, then 5min break and 15 on O2 - Total 45 min
>
>
> >You also will notice an improvement if you use trimixes as deco gases,
> >such as 35/30 and 50/25, in addition to the oxygen.
> Please, would you be so kind and explain why is it good to add He to your
> deco
> gas (e.g 50/25) ? Everything I know tells me that Nitrox 50 would be more
> appropriate.
> I know that some guys use it this way, just couldn't figure out why it is
> better.
> As far as I know by using Nitrox you create highest presure differential
for
> Helium
> causing it's accelerated offgassing.
>
>
> Regards
>
> Jozef Gliviak
> Slovakia
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