Michael,

The exercise issue is an annoyance for me as a cyclist as well.  Weekends
are my dive opportunities, and they are also when the best group and race
rides occur.
I limit my rides on days I do a big tek dive to 30 miles, whereas normally I
would do anything from 40 to 90 miles on each day.  Even after a mere thirty
miles, there are physiological effects obvious on the dive----my air
consumption is always higher after a fast bike ride, even the short 30
milers.  Lactic acid buildup occurs faster, and I have no doubt that CO2
buildup "could" occur with much less exertion than normal.  Part of this may
be due to depleted aerobic  glycogen levels after exercise,  which would
suggest  that propulsive efforts in fin swimming may result in anaerobic
glycolysis over much more of a dive than would normally occur without prior
exercise.  Higher levels of blood lactate and larger buildups of CO2 should
suggest O2 tox is a far greater issue than it would normally be.

Surprisingly, I have NEVER felt even the slightest tinge of DCS related pain
after a tek dive which followed an intense bike ride.
*note* after all bike rides complete re-hydration is effected prior to
diving; Typically 3 to 4 hours will elapse before even getting to the dock;
Intense Saturday or Sunday morning rides feel best when followed by a good
breakfast and  one hour nap :)

Regards,
Dan Volker

 -----Original Message-----
From: 	Michael J. Black [mailto:mjblackmd@ya*.co*]
Sent:	Tuesday, January 11, 2000 10:23 AM
To:	Rich Lesperance
Cc:	Aquanaut Mail
Subject:	Re: DCI Preconditions

DCI and DCS are not synonymous, Rich.  DCI = DCS and/or AGE (arterial
gas embolism).  Thanks for bringing this up as it is a common source of
confusion, even among the nitpickers.  And exercise before diving is
not recommended either, but doesn't carry as high a risk as exercise
before or shortly after diving.  Actually, this exercise thing bothers
me a little, because I love to dive, and I often exercise, but the
two are not highly compatible (as long as you dive with nitrogen in
your breathing mixture).  MJB


--- Rich Lesperance <richl@uf*.ed*> wrote:
> Doc Black:
>
>     When listing DCS predisposing factors, you listed :
>
> >>heavy exercise during or shortly after diving, <<
>
> Exercise _before_ diving is included also, yes? Not trying to sharpshoot,
> just making sure the conventional wisdom hasn't changed on me.
>
> Secondly, it's a nitpicky thing, but in the medical / dive physiology
> community, are the terms "DCI" and "DCS" synonymous? I always though DCI
> included _other_ pressure conditions treated by a chamber, namely AGE. If
my
> memory is fuzzy, maybe it means I'm getting old?
>
> Anyone else feel free to jump in with your impressions on the specificity
of
> the above terms. Obviously, whatever the educated majority here feels is
> correct, is the correct definition, by definition.
>
> Rich L
>
>
> ----- Original Message -----
> From: Michael J. Black <mjblackmd@ya*.co*>
> To: Aquanaut Mail <techdiver@aquanaut.com>
> Sent: Monday, January 10, 2000 4:38 PM
> Subject: Re: DCI Preconditions
>
>
> > Steve,
> >
> > DCI preconditions include PFO (which you can be checked for),
> > pulmonary blebs (which develop in obstructive disorders like
> > bronchitis, emphysema, and asthma), and other cardiac or vascular
> > defects that could lead to right-to-left shunting of blood, i.e.
> > venous to arterial shift.
> >
> > Risk factors are numerous, including dehydration, obesity and
> > poor physical condition, pushing the table limits, heavy exercise
> > during or shortly after diving, hypothermia, previous DCI, age,
> > alcohol, etc.
> >
> > Common sense counts for a lot, and even if you don't know all
> > the risk factors, just be careful.  If doing extreme diving, or
> > advanced technical diving like many on this list, it probably
> > is a good idea to get checked for PFO (although some will argue
> > that every diver should be checked).  As for pulmonary blebs,
> > don't smoke (common sense).
> >
> > Mike Black
> > __________________________________________________
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> > --
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>
>
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