>Dan:
>
>Please site where these stats on overwieght divers bending easier can be
found.
>I think there coud be some truth to your concepts, but you are
exaggeratting the
>magnitude.

I'll see what I can put together.

>
>Simply, if a fat diver with poor circulayion to slow tissues off gasses
slower
>than a slim diver with better circulation to slow tissues, then didn't the
fat
>diver not on gas as much gas in those tissues in the first place?

No, because the highly fit tech diver will be able to run an extremely low
heart rate, with extremely low exertion rate, particularly if they are
scootering, which is always desirable at depth on reefs or in caves.  For
this reason, the very fit have the ability to expose a relatively small
volume of blood to gradient, by low heart rate, during the bottom portion of
the dive, and on ascent, can increase heart rate and blood flow by mild
exertion.  The obese diver will have less ability to efficiently power his
body at low heart rate levels, and will have no where near the ability to
increase volume of blood pumped  through gradient, during ascent and
offgassing.


>
>Also, is VO2 max a reliable measure of inert gas to slow tissue delivery as
it
>is a measure of oxygen to slow tissue delivery?

It is the closest reasonable test of gas exchange rates that I know of. I
welcome any  sports physiologists out there to jump in with any better
tests---but I doubt there is a better "fit" than this one.
..
While I may be exagerating to make a point---once the study has been
finished, it may well be shown that the real problem is even worse than I
suggest.
Regards,
Dan



>
>Tom
>
>Dan Volker wrote:
>
>> There still seems to be too much controversy over fitness standards
needing
>> to be created. This can only stem from a misunderstanding by many of the
>> unfit divers, as to "WHY" they are at risk. My example below, is another
>> attempt to explain the concept.  Anyone else want to jump in to this?
>>
>> Ability to exchange gasses faster, as in an elite level athlete with a
high
>> VO2 max, will translate into exposing more blood in the body, to the
>> gradient in the lungs, in a given period of time. This could translate
into
>> a cross country skiing ( they traditionally have the highest VO2 max
scores
>> of any Olympic athletes) tech diver having the ability to offgas helium
and
>> nitrogen almost 4 to 5 times as fast as an obese  diver would be capable
of.
>> Since the effects of hypothermia and the challenge of supporting a tech
>> diver begin to become more pronounced after several hours of deco, this
will
>> make a huge difference, if the elite diver
>> needs a full hour to do deco from a 270  foot dive, for 23
>> minutes. The fat diver may find even more deco obligation than five times
>> the athlete's , because his longer stop requirements ( say 5 times as
long
>> at each stop) at 180, 170, etc., will
>> incur more deco obligation from the deep deco part of the dive----they
will
>> have to do more deco, just from their deep deco stops alone. This could
>> create exponential increases in deco time at 50, 40, 30, 20, and 10 foot
>> stops.  Instead of this being 4-5  hours of deco , as would be suggested
by
>> their slower gas exchange rate ( versus the 1 hour for the
>> athlete), they may "really" need 10 hours or even more.  Statistics on
fat
>> tech divers
>> getting bent after deep long duration dives are horrifying, giving much
>> credence to these
>> ideas here.
>> Dan
>>
>> --
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>
>
>

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