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  Richard Pyle <deepreef@bi*.bi*.Ha*.Or*> wrote:-

> If the tiredness [after diving] was due only to physical exertion, then why
> is it I feel wasted after a 10-minute drift dive (no exertion) to 100 feet
> on air, but I feel great all day long after a 2.5-hr swim dive on nitrox to
> the same depth?  This is a pattern that is repeated over and over for me.

  Is it due to more oxygen in the system allowing the body to be better at
clearing up as it goes the biochemical rubbish left by continuous exertion and
fuel-burning?
  Do you feel tireder after the same duration air dive (1) near the surface,
or (2) below 100 feet? (2) has more oxygen AND more nitrogen than (1).

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