- Messages
- 22,171
- Reaction score
- 2,791
- # of dives
- 5000 - ∞
I guess it is done. At the AAUS Dive Computer Workshop Karl Edmonds presented a paper that appeared to me to be aimed at discrediting dive computers in general, which was not a hard thing to do back then. He showed that a series of bounce dives, I think it was down to 100 and up, 10 minutes on the surface, down to 100 and up, and so on, would inevitably result in bending a diver (and in trial chamber runs had actually bent subjects) even though the computers of the day (there were only four out, EDGE, Micro-Brain, Suunto ML and Pelagic) would let the series go on long after the subjects were bent.
During the QnA Ralph Osterhout (Shamlian?) or Farallon and Tekna fame asked, somewhat rhetorically, ".. what sort of booger-eating moron would dive a profile like that?" In response to which Parker Turner drawled, "... why, we do it all the time." Laughter ensued.
So I guess there is some place for these sorts of profiles somewhere in the technical world, at least there was, at one time, amongst the WKPP.
As has been observed, DCS is a stochastic phenomena and doing something 100 times does not mean that it will not bite you badly the 101st time. Repeated bounce diving has been shown to raise the odds of getting bent ... Edmonds' study shows that bends are inevitable if the series is continued, even though tables and computers say that you'll be just fine. Bubble pumping is also a clear hazard and I know several people who have suffered loss of feeling and functions as a result.
If you want to do bounce dive series, knowing full well what I have told you, knock yourself out ... but I'd have to say that you do not understand the science or have the sense that you should have been born with.
BTW: Did you note that, "The PET(CO2) of six of the divers at pressure was greater than 50 torr, which based on animal studies markedly increases the risk of central nervous system oxygen toxicity."?
During the QnA Ralph Osterhout (Shamlian?) or Farallon and Tekna fame asked, somewhat rhetorically, ".. what sort of booger-eating moron would dive a profile like that?" In response to which Parker Turner drawled, "... why, we do it all the time." Laughter ensued.
So I guess there is some place for these sorts of profiles somewhere in the technical world, at least there was, at one time, amongst the WKPP.
As has been observed, DCS is a stochastic phenomena and doing something 100 times does not mean that it will not bite you badly the 101st time. Repeated bounce diving has been shown to raise the odds of getting bent ... Edmonds' study shows that bends are inevitable if the series is continued, even though tables and computers say that you'll be just fine. Bubble pumping is also a clear hazard and I know several people who have suffered loss of feeling and functions as a result.
If you want to do bounce dive series, knowing full well what I have told you, knock yourself out ... but I'd have to say that you do not understand the science or have the sense that you should have been born with.
BTW: Did you note that, "The PET(CO2) of six of the divers at pressure was greater than 50 torr, which based on animal studies markedly increases the risk of central nervous system oxygen toxicity."?
Last edited: