Wendell, that has been our big finding as well: the more fit players bubble
less and for less time with less deco. For instance, JJ and I did a dive
with 150 minutes BT at 285 and sharply accelerated the deco. We ascended
from 30 feet without our usual procedures while John Rose, Jess Armentrout
and others did a similar bottom time but did the WKPP prescribed deco
procedures. Rose showed grade 1 bubbles which then trailed off, I showed
grade 4 upon getting out of the water and showed nothing 30 minutes later.
That Doppler was performed by Drs Johansen and Chimiak from Navy. Rose and I
are Masters swimmers, Trout is a trigeek, JJ does it all as well.

A fit body clears fast, and is not a battery for gas, is well perfused and
generally tolerates all the stresses of diving better. Unfortunately, the
weightlessness factor tends to fool the buffaloes into thinking they are ok.

-----Original Message-----
From: Wendell Grogan [mailto:wgrogan@dc*.ne*]
Sent: Thursday, June 07, 2001 9:17 PM
To: Trey
Cc: Bruce Sherman; Quest@Gu*. Com; Techdiver List
Subject: Re: Not opening PFO's, waqs RE: Repairing PFO's


Sure, that's the point behind not exerting yourself for a while after
the in water part of your off gassing.  Until you stop bubbling,
anything you do that causes a rise in chest cavity pressure- bending and
lifting, straining, etc- can open the PFO and shunt bubbles into your
brain.  Its also another reason to get in shape.  The faster you stop
bubbling, the less effort you have to use to lift your butt and your
gear out of the water, the less risk you have of getting bent.
Wendell

Trey wrote:
>
> Thanks for this - it makes my point that real diving knows all about this,
> the dive training agencies try to hide it with the "expert" help of DAN
and
> their tobacco company spin on statistics.
>
> I was looking at an interesting thing on PFO not related to diving. It
seems
> that people with curvature of the spine tend to force open their PFO's and
> become somewhat hypoxic, so it has to be corrected ( hence the studies I
was
> reading ). While that may not apply to anyone but an old goat like Tom
> Mouth, what it does tell us is that post dive exertion in the form of
> bending over and picking up gear may open some of these shunts if they
> exist, and of course that is when you are hitting your peak of off gassing
> in bubble form into the venous blood.
>
> Picture holding the heart top and bottom between two hands and pushing the
> hands towards each other and you can see how this would be true. Along
those
> lines, this may be why coughing and such may open them as that involves
the
> diaphragm, which is up against the bottom of the heart's container,
pushing
> up against it like the hands example or the curved spine compressing it
that
> way.
>
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