Mailing List Archive Mailing List Archive
Nelson:
There is a little known physical property of fluids called VISCOSITY. If
a fluid is thick (like, say...... Molasses... you still with me?) then it is
MORE VISCOUS than something not so thick (like say.... water..... Need me to
repeat that?). The force required to move a viscous fluid at a constant speed
is directly proportional to the area of the surface it is touching, the
velocity it is travelling, and inversely proportional to the diameter of the
tube. Now if a usually flexible RBC becomes rigid, my reasoning was that the
solution it was a part of would become more viscous.
I know this is hard to imagine, but next time you're drinking your soda
through a straw, imagine drinking molasses that way. See how much harder it
would be to suck it up? Good.
Now I have no idea how much of a problem this is in diving. The fact is,
when I read the message on RBC rigidity, I was studying for an exam in the
comparative endocrinology of the adrenal gland and the anterior pituitary, and
had all the interelated effects and causes of hyper and hypotension in my mind
(including diuresis and dehydration). I put the question/response up to
foster further discussion, and increase my knowledge. I never meant to
confuse you so much. I am so sorry
Ben
nelson wrote:
> Ben Greenhouse wrote:
> >
> > 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.
> >
> > --
> > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
> > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
> NOPE.......What is your knowledge base to make such an assumption.
--
Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]