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Date: Sat, 1 Nov 1997 18:18:09 -0500
From: Ben Greenhouse <b.greenhouse@ut*.ca*>
To: techdiver@aquanaut.com
Subject: Re: Re: Physiology
Nelson;

    "One" never claimed to be an expert, my rationale behind that
thought was that the blood would become more viscous due to the
increased rigidity of the RBCs.  This in turn would cause an elevation
in blood pressure.  Sound fair to you?

Ben

nelson wrote:

> Ben Greenhouse wrote:
> >
> > Dave:
> >
> >     I'm not too sure of any longterm problems, but I would imagine
that
> > an immediate problem from
> > red blood cell rigidity is hypertension.  The increased work your
heart
> > has to
> > do in this situation may increase nitrogen uptake.  As well, the
reduced
> > blood
> > flow in your circulatory system due to the hypertension may inhibit
> > off-gassing from poorly circulated regions.  Anyone agree/disagree?
> >
> > Dave Nunes wrote:
> >
> > > Bill Mee wrote:
> > > >
> > > > From a strictly physiological viewpoint you will definitely feel

> > less
> > > > tired and more "energetic" post dive following a lengthy
exposure
in
> > the
> > > > 100' range after breathing a gas mix where helium replaces part
of
> > the
> > > > nitrogen. We know that red blood cells become rigid at high
ppn2s
> > and
> > > > loose some of their hemodynamic characteristics which benefit
plug
> > > > capillary flow.  On the other hand helium is a "fast" highly
mobile
> > gas
> > >
> > > Bill,
> > >
> > > Please forgive my ignorance but, what are the
> > (physiological??/Medical??)
> > > side effects of red blood cells becoming rigid due to high ppn2's,

can
> > this
> > > cause any problems with normal everyday health (in the long or
short
> > term),
> > > is it permanent damage? What does this do to one's body?
> > >
> > > Ciao
> > >
> > > Dave Nunes
> > > Infoview Client systems
> > >
> > > --
> > > Send mail for the `techdiver' mailing list to
> > `techdiver@aquanaut.com'.
> > > Send subscribe/unsubscribe requests to
> > `techdiver-request@aquanaut.com'.

> What is the scientific rationale that increased RBC rigidity causes
> hypertension?  That is the nice thing about science...it soon
separates
> the fact from the fiction or BS).  One would also question whether one

> has the education and background to make such statements.

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