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>Tough guy, since air would likely have more O2 than trimix, there >would be more CO2 produced potentially. Helium is easier to breath, so But, O2 content cannot be a large part of it because the body already has more O2 in the breathed gas than it metabolizes. Unless you increase metabolism, CO2 production should remain constant. >there is one way you get less CO2 (less work), and as it is less >dense, the transfer out is better, and since you are theoretically Now the "work" due to ease of breathing will definitely cause less CO2, but, for depths of, say, 300' or less, will this be a very large number? Off the top of my head I'd guess that the change in ease of breathing for mix vs air at 300' is virtually negligible. >diving a lower PPO2, you will get less of the effect where big >concentraitons of O2 in the blood block the escape of CO2 from the >tissues, a problem in deep diving. I assume that by "buildup", you 70% of CO2 is carried in the blood as carbonic acid so that should be unaffected, however, any of the CO2 that binds to hemeglobin may be affected due to increased presense of O2 in solution and the tendency of the Hb to stay bound to the O2. SO, this is DEFINITELY a potential avenue for CO2 retention in the tissues. >mean trapped in the tissues. Anyone with good cardiovasuclar >efficiency will naturally have less of a problem with this. - G Absolutely correct, anyone would be a fool to argue this point... I'm interested in proposed reasons for the O2 tox onset being related to exertion (i.e. CO2 buildup) - is a mechanism even proposed for this? -Carl-
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