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Date: Tue, 2 Sep 1997 16:02:37 -1000 (HST)
From: Richard Pyle <deepreef@bi*.bi*.ha*.or*>
To: George Irvine <gmirvine@sa*.ne*>
Cc: "Paltz, Art" <Art.Paltz@R2*.CO*>, techdiver@aquanaut.com, cavers@ge*.co*,
     freeattic@co*.ci*.uf*.ed*, rebreather@nw*.co*
Subject: Re: Red Cell Rigidity on deep air diving wasRe: (no subject)
> To tell you the truth, the more I see it, the shallower I make my aed
> for nitrogen. The problem then becomes that you do not have as much gas
> due to the lower degree of compressibility.

This much I agree with - I started limiting my PN2 to about 2.5 atm as 
soon as I started using the rebreather. The compressibility issue is 
insignificant with a rebreather - even a semi-closed one. Put N2 in your 
bailout cylinders.  The only reason I use nitrogen at all anymore is to 
alleviate the "helium willies", which I know you already know about.

> Personally, I do not like the feel of a 130 air dive later on, so there
> is some kind of damage, so maybe just having ANY helium works, since a
> 130 trimix dive does not produce the same effect, and a 130 aed trimix
> dive does not produce the same ell as a 130 air dive. 

Everytime I go deeper than 100 feet on air I feel like shit that night 
and the next morning.  I realized that I always felt that way before, but 
just figured it was related to diving in general. I don't feel that way 
at all with the helium - not even after the days where I do two deep 
ones, and even on dives when the PN2 is greater than it is for air at 
100-130. I don't think it's the presence of helium as much as it is the 
elevated O2 on deco.

> I am just going with what my experience tells me, but now we are in the
> mood to take it further to see hat the story is, besides, I like rabbit.

When you do these experiments, let me know how the rabbit tells you 
when its shoulder hurts.

Don't get me wrong, george - I keep the N2 to a minimum also. It's just that
I am smart enough to know that "quickie" explanations like the RBC rigidity
thing are usually only a small part of the full picture, if any part at all.
I am also very dubious about doing deco on helium as compared to doing the
bottom on helium and the deco on N2. 

Rich

Richard Pyle
Ichthyology, Bishop Museum                deepreef@bi*.bi*.ha*.or*
1525 Bernice St.                          PH: (808) 848-4115
Honolulu, HI 96817-0916                   FAX: (808) 841-8968
       "The views are those of the sender and not of Bishop Museum"

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