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On Thu, 30 Jun 1994, Hadland Keith wrote: > > Is it possible that the gas loadings in my lungs could get to the state > where my decompression is being slowed because the rate of release is > dropping (ie. the ppN2 in my lungs is close to the ppN2 in my blood)? Should > I make a conscious effort to breathe deeper and more often during my stops > to offset this, and would it make my stops any safer if I did? > A couple of my thoughts: The gas exchange occurs not only in the lungs but also in the tissues. Not only would your breathing rate need to be close to what it was when you were working but also the blood flow to the various parts of the body needs to be similar. Other wise how is the gas going to get out of your tissues (muscles etc)? I believe I read that Buhlmann had his divers excersize on a bike for so many minutes periodically. I recall hearing an English doctor tell about incidents of DCS at the TEK 94 conference in New Orleans. 3 or 4 thousand cases were included in his sample of dives. He showed an xray of bone necrosis (OK OK it really doesn't show the dead bone, only the new bone growth that is a result of the dead bone) in a diver. One shoulder was perfectly fine the other had considerable damage. The diver was right habded and guess which shoulder was damaged? Yep the left one! I have heard opinions pro and con about excersize on deco. I think it needs to be done. Seems very logical. On my deco I swim against the cave wall whilst doing "push-ups" with my arms. Gets everything flowing. On the same not it follows that your equipment should not be so tight as to restrictive to blood flow. You get the flow when busy but when resting it may be just restrictive enough to reduce the flow and adversley the ofgassing of that shoulder, arm, wrist etc. Oh yes I do it while I am on my air break, no use pushing anything while on 100% O2 @ 20 feet. Ronnie Bell in Arlington Virginia
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