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Yes, Art, when you squeeze the muscles, the gas come flying out as
bubbles into the venous side. An overlaod at this point could blow by or
cause enough of a pressure change to open a PFO. I treat myself as if I
have one at this point in the dive, and have asked all of our divers to
do the same. You should hear the Doppler when you exert just after a
dive - it is really scarry.


Paltz, Art wrote:
> 
> I think this is why George suggests floating for a while at the surface and
> resting before getting out of the water.  I would think that taking off your
> gear in the water and not having to climb a ladder and struggle on deck is
> probably good too.  If I could get someone to haul my gear up on the boat
> for me I know I'd do it!
> 
> Art.
> 
>         -----Original Message-----
>         From:   Deep1dave@ao*.co* [SMTP:Deep1dave@ao*.co*]
>         Sent:   Monday, January 10, 2000 4:31 PM
>         To:     twernberg@us*.ne*; techdiver@aquanaut.com
>         Subject:        Re: boble formation
> 
>         Greetings Thomas,
> 
>         I am sure that some of the other members could explain the physics
> better.
>         Here is my understanding.
> 
>         After a dive, your body can be likened to a full champagne bottle.
> The
>         different tissues are contain excess dissolved gas, the degree of
> which
>         depends on the effectiveness of your decompression.  Exercise
> creates
>         turbulence in the blood vessels, which is like "shaking the bottle,"
> and this
>         can promote bubble formation.
>         The risk factors vary with the dive, your bottom gas, decompression
>         technique, your off gassing physiology and the surface interval.
> So-- don't
>         shake the bottle when it's still full of gas.
> 
>         David
>         --
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