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David, How much a diver consumes really has nothing to do with deco obligation (other than having an unwieldy amount of gas on a dive). The gas rate becomes a problem is the gas uptake rate is significantly different from the outgas rate (due to work ->working tissues requiring O2) To take one case; a well perfused diver, a working dive followed by a resting deco is not going to result in a bad day. The gas will exchange (as it is a function of tissue perfusion, gas soluability and pressure gradients (with temperature affecting the gas soluability)) since there is an avenue other than diffusion to get the gas out. A look at the worst case; a diver that does not have good tissue perfusion, a working dive (using lots of gas) followed by a resting deco, this individual is DEMANDING to have a bad day. The lipid tissues (and much higher soluability) surrounding the limited capillaries will result in ongassing (by diffusion)of the gas during the uptake phase (due to workload) but when relaxed the limited perfusion (and much slower diffusion) will leave gas in the tissues that will want to come out as bubbles. All of this gets worse in cold water...... George, Not trying to put words in your mouth, but I think this is what you were driving at. Steve > -----Original Message----- > From: David Geffen [mailto:geffen@gm*.de*] > Sent: Wednesday, January 12, 2000 7:35 AM > To: 'kirvine@sa*.ne*' > Cc: techdiver > Subject: RE: Deco theory and breathing rate > > > Thanks. How about gas consumption during the "working" phase of > a dive - would someone who _consumes_ 16l/min have less bubbles > than someone who consumes 24l/min? > > > Some of guys try to breaths as much as they can to get good > > ventilation and gas exchnage, and that is probably better. > Does that coincide with doing light swimming on deco? > > David > > > "breathing rate" is basicly insignificant, but you could > get effects if > > you breathed too little relative to normal breahting. The problem is > > that you get relaxed and do not produce much CO2, and obviously have > > very hig O2, so your reflex drops away. This could make for less gas > > exchange, maybe. I ignore it , and try to breathe about > once per minute > > to save the gas. There is no reason to do that other than I > do not want > > to put the correct amount of gas in the water or lug it > around, or have > > to refill it. I really try to use half of a bottle and save > the other > > half for the next dive and just leave the regs on the > bottles in my van, > > and use what's left of my stages for breaks so I do not > have to refill > > or break down my doubles. I also do not liek to get cold, > so breahting > > infreqauentlyh saves on heat loss. > > > > Some of guys try to breaths as much as they can to get good > > ventilation and gas exchnage, and that is probably better. > > > > David Geffen wrote: > > > > > > Hi George, > > > > > > I've been following the discussions on deco theory on techdiver > > > for some time now, but miss any mention of breathing rate. > > > > > > Is this non-relevant? I could imagine that a low breathing rate > > > during bottom time would be beneficial insofar as less ongassing > > > is occurring. OTOH, would it be beneficial to breathe more while > > > offgassing? > > > > > > Regards, > > > David Geffen > > -- > Send mail for the `techdiver' mailing list to > `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to > `techdiver-request@aquanaut.com'. > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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