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tgunther@co*.co* wrote:
> 
> Dan:
> 
> George should be able to provide some good information on this.    I'm told he
> is a runner himself.
> 
> Tod

  Tod, I am hesitant to answer this due to the "40 meter, recreational,
no deco" comment. This is inconsistant with reality and may lead to a
bad representation.

  Only the correct proceedures and use of the correct gases will allow
diving with no perceptible loss of vital capacity as measured by
athletic perfomance.

  I do those dives with 30 ox 35 helium with decent and ascent rates
which are slow and with effective deco, and have no problem with my pool
or running times. I can get the same result on a massive exposure in
deep water as well if done correctly. Done improperly, the loss is
staggering.

  As a side note, oddly enough, a tad of hyuperbaric oxygen ( as implied
by these dives ) actually can work in favor of the joints, wheras too
much or too high or often of a dose sharply reduces vital capacity at
the lungs and in the entire vascolar system, not to mention the extreme
damage done by nitrogen or by inadequate decompression or too much deco
at the intermediate steps. 

  I would certainly not dive air or nitrox and any depth and expect to
see good perfomance the next day in a race. Keep in mind that I do the
equivalent of an olympic distance trialthelon most every day of my
life.In fact, I did one this morning before work.

  Short term the idea is to avoid muscle and lung damage, long term is
to avoid bone and connective damage.

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