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> For recreational exposures high fat tissues do not pose deco problems since > the slow absorbing tissues have not had time to onload. Post-dive they may > actually serve as a sink of high nitrogen solubility and lower the risk for > DCS on single dives. However, repetitive dives will be worse since A) the > fat diver has retained more inert gas in slow tissues and B) these same > tissues may become governing on the second or third dive. In saturation > diving obesity is a great liability since then the slow tissues get time to > absorb gas to their full capacity. [snip] > The whole point is, ultra-slow compartments with a huge dissolving capacity > are beneficial sinks when near-empty while they become a great deco problem > when they are filled. Since helium is faster than nitrogen a shorter > exposure will be needed to get beyond the critical point. Further, as Dan > says, when obese divers have to fin hard their workload increases many times > that of a fit diver. Since any minor task will mean hard work their > ventilation and heart rate are higher. This means faster uptake per unit > time than for a fit diver. > > Now, rec diving probably won't fill the slow compartments anyway. Sat diving > will fill them anyway. Thus, single-dive obese rec diving will not reach the > critical point and sat diving is always beyond it. A big rec diver will not > cross the line while a big sat diver has taken it to the max anyway and may > huff and puff all he needs to -- it's already as bad as it can get. > Technical diving is in-between. Most exposures are way into decompression, > yet far from saturation. > > If anybody wants to try to do the math, the turning point is where the > adipose tissues go into decompression. Remember to count in higher blood > turnover from higher work load. Nice post, I was just about to try to steer things this way. Had ye old simple Haldanean formula out saying, ok where does the fat come in... So we are basically talking about tracking gas in 1-2 new slower tissue compartments? Perhaps using a slower tissue to determine the offgassing (surface interval) ? And while it would be easy to generate these new tables, it would be hard to figure out who exactly they model. Mike -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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