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The following relates to the issue of DCI in free divers. Lin (1) quotes Paulev (2) as saying that DCI occurs in free divers when the depth time product reachs a constant. I have not seen (2) so I can't comment on the conclusion. What this conclusion tells us about the "cause" of DCI in free divers I don't know. Possibly some of the decompression experts on the net have an idea. The following relates to the issue of lung squeeze in free divers. Lin suggests that the reason people can free dive beyond 4 ATA is because blood is displaced into the chest descreasing a free divers residual volume. He is not clear on a reference for this observation although Craig (3) might be relevant. I have not seen this reference either. Angela Bandini ( holder of the world free diving depth record for a while ) in ( 4 ) describes deep free diving "In this sport, the wall is at about 160 feet. At this depth, she says, everything in your body ""takes up its position against the pressure,"" and from then on, as you sink deeper, ""the body has a sort of stability. All the soft parts, all the vital organs, come up into the thorax"". Sounds like quite a body rub. Having quoted Vogue I will now get back to work! Barrie Kovish Vancouver, Canada bmk@ds*.bc*.ca* 1. Lin, Yu-Chong. Physiological Limitations of Humans as Breath-Hold Divers. MAN IN THE SEA, Volume II, 33-56, 1990. 2. Paulev, P.E. Decompression sickness following repeated breath hold dives. J. Appl. Physiol. 20:1028-1031, 1965 3. Craig, A.B. Depth limits of breath-hold diving. Respir. Physiol. 5:14-22, 1968 4. Vogue April 228-230, 1990
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