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Hi Don, George discussed the history well. I would just add that better decompression success and RELIABILITY seem to be two of the big keys. In other words being able to consistently succeed is the real issue. The other huge benefit to conditioning relates to one's ability to handle the stress of the dive, repeated dives, and associated physical stress. Without conditioning, the long dives or repeated dives from major expeditions (or relatively speaking from normal trips) wear one down, making them more susceptible to a range of physical stress problems including DCS. JJ At 07:59 AM 11/2/2000 -0500, Don Hoover wrote: >George, JJ: > >Did you maintained a physical conditioning (i.e. running/cycling journal, >strength training, mile of swimming ect.) log that could be correlated to >your decompression dives and Doppler examinations? Has Dr. Hamilton examined >this relationship. The reason I am curious is that PADI will launch their >"Recreational Tech. Diver" program next year and I have friends who will be >training interested individuals. I explained to them the other day how >important physical conditioning, proper physical examinations of students >(PFO examinations, stress test ect.), diet, and understanding of >decompression diving and gas mixing will be to their students. Neither are >Tech divers now but work for a shop that is TDI certified and is training >them. I asked them what happens to their liability if they have someone >stroke out because he/she had a PFO, only dives 5 times a >year(recreationally) and did not maintain proper physical condition. They >had a blank look on their face. I am very concerned about the sophomoric >divers who think this is just another form of recreational diving. > > >-----Original Message----- >From: trey@ne*.co* [mailto:trey@ne*.co*] >Sent: Thursday, November 02, 2000 6:01 AM >To: NPerry255@ao*.co*; techdiver@aquanaut.com >Cc: GUE_Lista >Subject: RE: DIR clarification > > >Nelson, we originally went to Hamilton Research for custom trimix tables. >Dr. Bill Hamilton is a physiologist and worked in oil company and other >environments where mixed gas tables were first employed. What he developed >for WKPP dives were initially very long schedules, which actually helped our >gear thinking since Bill Gavin wanted to speed up the dives as much as >possible to avoid the long decompressions first believed to be necessary. He >and I could add and survey 1000 feet of line every six minutes. > >When Parker died I became the one who interacted with Dr. Bill and we used >me as the test subject for shortening the tables and changing the shape, the >depth of the stops, and the gasses used. I boosted the helium , again quite >by accident as I was also the survey guy, so I needed to be mathematically >clearer. Suddenly I could do a whole lot less deco - the fist thing that was >counter to conventional wisdom on helium. I could find no deco that worked >reliably for weak mixes or air. Gavin and I tweaked the tables repeatedly by >using software containing Bulhmann, but giving it false values for helium >and oxygen percentages, like telling it the helium was lower and the oxygen >higher than it was to get the right shape we believed was better - it was. > >We changed from using 40% and O2 to inserting a 50% bottle to make the >intermediate stops more effective, and then started using the 190 bottle for >deep stops. This JJ and I converted to 19X35 after several iterations. Then >JJ started adding helium to the 120 bottle. I axed the intermediate stops >way back in concert with Hamilton's recommendations and we just smoothed it >out until we found the ideals using Doppler and me and JJ as a test case . >JJ and I would hang around by the water in our dry suits in case we had to >get back in, and get bubble checked until clear. > >The deco development down to reasonable schedules and techniques that work >across the spectrum is one of our biggest contributions to tech diving, and >trust me we got nothing but badmouthed and were fought all the way on that >one. Notice now the Dr. Weinke and NAUI have now corroborated our results >using the chamber at Los Alamos and sophisticated tracking techniques. >Notice they also allow teaching of DIR. > > > >-----Original Message----- >From: NPerry255@ao*.co* [mailto:NPerry255@ao*.co*] >Sent: Wednesday, November 01, 2000 9:27 PM >To: trey@ne*.co*; techdiver@aquanaut.com >Subject: Re: DIR clarification > > > Thanks for the historical perspective (always wondered about >"Hogarth!"); >it makes the posts more informative... Probably many List divers (inc. me) >don't personally aspire to the extreme pioneer exploration that WKPP does: >but your success and the knowledge gained -- and shared -- benefits the >whole >tech diving community. Particularly important are the radical changes in >decompression theory AND application, which you & JJ have put to the test. >(On a small level, it was from the List that I learned to use 50% O2 (not >36%), pick a lower END (90') and incorporate proper deep stops (GUE Deco >Planner or RGBM). Safe diving, > Nelson > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: quest-unsubscribe@gu*.co* >For additional commands, e-mail: quest-help@gu*.co* > >--------------------------------------------------------------------- >To unsubscribe, e-mail: quest-unsubscribe@gu*.co* >For additional commands, e-mail: quest-help@gu*.co* Jarrod Jablonski President- Global Underwater Explorers www.gue.com CEO Extreme Exposure www.extreme-exposure.com Global Underwater Explorers www.gue.com GUE is a non-profit educational, research, and exploratory organization with hundreds of dedicated members around the world. Extreme Exposure www.extreme-exposure.com Extreme Exposure and Halcyon manufacturing produce some of the scuba industry's most novel and robust diving equipment designed by many of diving's most active explorers. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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