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mark.welzel@ex*.co* wrote (Subject: Re: Tired after diving):-

> I don't want to say this isn't so but I was under the impression that the
> tiredness was the result of accumulated Nitrogen in the nervous system. ...

I always thought that tiredness from diving is caused by the same thing as
tiredness after a day navvying or a day shifting goods in the docks etc. The
average aqualung diver is hydrodynamically a bad shape, and pushing all that
lot through dense water for an hour or so uses up a LOT of energy. E.g. my
last dive was with a short fat cylinder, and its big flat stern end made a lot
more drag slowing me badly than with a normally-shaped thinner cylinder. Old
experiments with (how big frogmen's rebreathers' absorbent canisters had to be
to cope with likely maximum work load without causing `shallow water blackout'
from CO2 buildup) showed that swimming divers worked a lot harder than they
realized they were: the weightlessness made it seem less effort than it was.
One cause of tiredness is buildup in the system of lactic acid left over from
metabolizing glucose so fast that its partway breakdown products accumulate.

> Myself and others have found that if you use O2 or a high Oxygen mix for
> deco to wash Nitrogen more competely from your system you feel good after a
> dive, not tired. ...

Oxygen euphoria.

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