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Hi Clifford, You wrote; ***** > > On Thu, 13 Jul 1995, Jason Rogers wrote: > > > > > PS I don't trigger breathing on raised CO2, I trigger on depressed O2 > > > (dispite what the text books say) > > > Cheers Jason :) Sorry but unless you have an extraterestrial body chemistry your breathing is triggered by CO2. > > -- > When I hold my breath on air, I find that a horrible sense of impending > doom forces me to breathe at about 3 minutes. If I don't, I pass out. As it should, when the level of CO2 reaches a threshold level, reflex to breath. > When I take a couple of breaths of pure O2 first, I have no trouble > Holding on for 7 minutes. I feel fine! Though I find that I have > these rather alarming diaphram spasams that cause me to jiggle about > in a most amusing fashion. I get the feeling that this isn't really > first class, top notch way of looking after your body, so I've only > done it once, just to see. It does however make me *very* sure that By breathing O2 you have flushed the CO2 from your system. The result is as the O2 in your lungs is metabolised and converted into CO2 the resulting Patrial Pressure of CO2 is to low to trigger breathing. > I could dive down 20m or so, feel no pain, then pass out on ascent. > Hence I free dive *very* carefully. Ever heard of underwater blackout. By prugeing the CO2 from you system by hyperventalating with O2 you have effectively overriden your natural breathing response. You will swim merrily along with no desire to breath until you blackout for lack of O2. With potential letheal result. **** I didn't "hyperventilate" on O2. I took a *couple* of *normal* breaths. I don't think that just by breathing O2 I could have "flushed the CO2" out of my body. The CO2 level in normal air is *tiny* (I can't remember just what it is, but very low, <1%) not much different from medical O2. If I do hyperventilate on air it only extends my breath hold time a small amount. (15 seconds or so) BTW I accidentally breathed pure N2 last week at work. I only took *2* quick breaths and I *knew* that I was on the wrong gas. (I was on the surface, no danger) I had *EXACTLY* the same feeling of doom I get when I hold my breath. The text books say I should have just quietly passed out with no warning. Because at that time I *was* hyperventilating (as I cleared the pressure out of a line so I could disconnect a fitting) I would have been *depressing* my CO2. Cheers Jason ET :)
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