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From: <giii01@In*.Co*>
Date: Sat, 15 Jul 95 19:56:22 PDT
Subject: Re: Breath holding @ CO2
To: cavers@co*.ci*.uf*.ed*, techdiver@terra.net
Cc: Jason Rogers <gasdive@sy*.DI*.oz*.au*>, techdiver@terra.net


       The swimming workouts which we do to promote 
cardiovascular efficiency are intended to increase
gas exchange rather than increase tolerance to high
CO2. In fact, we use blood tests to determine the
level of metabolic acidosis (finger prick). High
CO2 means the workout had improper ventilation or
that conditioning was not yet up to the workout level.
I have fouund this to be a big help with working gas
consulmtion as well as decompression, thermal, and 
general pleasure of the dive, not to mention the 
corolary benefits of the conditioning. 
       As high CO2 levels have been implicated in
decreased O2 tolerance (probably due to vasodilation),
most organized diving considers an abnormally low
breathing rate to be a risk, and obviouly so if signs
of CO2 buildup are included, but I have never seen a 
discussion of highly fit divers' low gas consumption
being a risk. The stuff I saw was Navy-diving related. - G

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