Sean,
What are you looking to do with your diving? Perhaps PM me since it's not really part of this thread, unless others want to read it.
Pete
i am definately interested and would like to read it
thanks.
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Sean,
What are you looking to do with your diving? Perhaps PM me since it's not really part of this thread, unless others want to read it.
Pete
Pete,
I get a rapid dive response with the negatives, so I have kept them up. As I'm training more for endurance (spearfishing or recreational diving) than competition, I'm assuming that more pushes to the brink (while staying safely dry) will improve my endurance for a 3-4 hr dive in Hawaii (or up here in summer).
In addition to the dry stuff, I do modified frc one night a week. 25 yd on the bottom neutrally buoyant by partially emptying my lungs, and 25 back on the surface on my back recovering.
it seems to me that you are mixing two quite different things together:
1 - negatives - this refers to forceful exhale(s) before breath holding, leaving the lungs close to residual volume (depending upon how much air you actually exhale). this can create negative pressure in the lungs as the pressure in the lungs can be below ambient. negatives are quite often used during warm up to help strengthen blood shift and can assist with depth adaptation.
2 - exhale diving - this refers to doing a passive exhale prior to breath holding, leaving the lungs at ambient pressure or functional reserve capacity during the hold. this style of diving is also called frc, seal or e (empty) diving. this is the style of diving pioneered by sebastien murat, among others.
Image:LungVolume.jpg - Wikipedia, the free encyclopedia
contractions due to carbon dioxide build up are nearly impossible with empty lungs during negatives. any contractions experienced are likely due to low oxygen levels.
as far as buoyancy, when diving the frc style the idea is to be able to sink in a passive fashion from the surface. the descent essentially becomes a static, which conserves oxygen until ascent (when the dive response is much stronger). comparing only the last part of the ascent it may seem more difficult to get to the surface using the frc style than full lungs due to the negative buoyancy; however, sebastien murat's findings consistently demonstrated that a diver returns to the surface with HIGHER partial pressure of oxygen in the lungs when using the frc style than with full lungs.
i may be mistaken, but i do not think there is more of a risk of water inhalation during exhale/frc diving than f (full lungs) diving; however, a diver's lungs will hit residual volume at a shallower depth given the lower starting lung volume. the pressure on the lungs at various depths will also (initially) feel greater using the frc style versus full lungs, and time for adaption is necessary to avoid lung squeeze.
finally, negatives should be performed with extreme caution as water inhalation after black out may be possible (due to the negative pressure---vacuum effect). in addition, it is easy to replicate the pressure of very deep dives and thus cause lung injury, if not properly adapted. i have read accounts of numerous experienced divers who have injured themselves while doing negatives.
more experience frc divers feel free to jump in here![]()
cheers,
sean
vancouver, canada
Sounds scary, or maybe I am not understanding correctly?It's kind of like trying to reach John Lilly's "high indifference", but with the ability to get out of it before drowning (make sense?).
For those who never heard of him, Lilly was a dolphin researcher that turned to deprevation tanks and chemicals to get inside himself as the first step to communicating with the dolphins. He described the high indifference as the the ultimate guy watching the tv set watching the tv set watching...watching reality back in his head. My only brush with it was during my SWB. I was aware, but had no attachment to anything, including breathing or continuing with my life.
I meant both. It sounds like experiencing an altered state caused by hypoxia. Maybe like an 'out of body experience'?Naiad,
Which sounds scary, the swb or John Lilly's idea? Actually, both were. The swb was for obvious reasons (close call), and the brush with the high indifference was because that part of my brain really didn't care one way or the other whether I lived or died. It was just observing (a very unnerving experience).
Howard