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If after a dive you have a hard climb out of a cenota what would be a fair
amount of time to wait?

Thanks,
Rich

----- Original Message -----
From: "Wendell Grogan" <wgrogan@dc*.ne*>
To: "Trey" <trey@ne*.co*>
Cc: "Bruce Sherman" <bruce.s@co*.co*.nz*>; "Quest@Gu*. Com"
<quest@gu*.co*>; "Techdiver List" <techdiver@aquanaut.com>
Sent: Thursday, June 07, 2001 6:17 PM
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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