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Scuba Stories, Comments & Questions that don't fit elsewhere! I think the title says it all!

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Old 09-25-2007, 10:46 PM   #41
DiverBry
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Sometimes we start a dive on one end of the lake, and finish it on the other end, and someone gets the idea to "just walk back!"

I often wished I had nitrox in the tank for the loooong walk back... might keep me from getting out of breath, LOL!
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Old 09-26-2007, 12:19 PM   #42
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Quote:
Originally Posted by Xspect View Post
Pure 02 can be very harmful and dangerous. It is considered a drug in the medical profession
I agree, i do believe that the O2 that you get at those oxygen bars is a tad bit different then what you get in your tank. It is a more pure O2. Because there is no change in BAR they can use a more pure form.
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Old 09-26-2007, 12:41 PM   #43
Charlotte Smith
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Has anyone ever seen the oxygen enriched water they sell in health food stores? If you really wanted to "sip" a little.....this sounds like the way. It IS expensive though....
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Old 09-26-2007, 01:29 PM   #44
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I have actually tried that water & I swear it helped my hangover. Of course I have no way to back that up. It was probably just the fact that I drank 2 20oz bottles of it...
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Old 09-26-2007, 01:56 PM   #45
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I have actually tried that water & I swear it helped my hangover. Of course I have no way to back that up. It was probably just the fact that I drank 2 20oz bottles of it...
Me too but not for a hang-over, I thought I might have more energy and it seemed that way but could've been all in my head. I hear that by the time the water reaches the shelves the O2 is gone. I have alo heard about O2 water fountains being great because the O2 doesn't go in until you get the drink......who can afford one though....
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Old 09-26-2007, 03:31 PM   #46
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Eh, O2 water fountains sounds gimicky. The only thing that's ever worked for me for hangovers was either Pedialite, or Gatorade (the former working much better than the later)
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Old 09-26-2007, 03:43 PM   #47
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Eh, O2 water fountains sounds gimicky.
very gimmicky. do they actually sell things like that?
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Old 09-26-2007, 03:47 PM   #48
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Quote:
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Eh, O2 water fountains sounds gimicky.
very gimmicky. do they actually sell things like that?
hmmmmmmmmmm
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Old 09-26-2007, 06:00 PM   #49
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Gimmicks and more gimmicks

At normal atmospheric pressure, almost 100% of your oxygen transporting sites are occupied by oxygen in your arteries. Thus, breathing from a nitrox bottle (or even a medical oxygen bottle) exerts little of any physiological impact in a healthy person, whether frankly fatigued or just looking for a lift in their living room or at a bar. It is only at significantly elevated pressures where the oxygen-carrying capacity of the blood increases (gas becomes more soluble in liquid as pressure increases). At elevated pressures, we still transport the oxygen bound to hemoglobin on the red blood cells, but we also transport a load of oxygen in the liquid component of the blood. Thus, oxygen bars and oxygen-charged water = money thrown away.

Concerning risks of breathing oxygen: After breathing pure oxygen for 24 consecutive hours, cells of the body are expected to synthesize enough oxygen free radicals to decrease the vital capacity of the lungs by about 10% (this decrease in function meets the criterion for toxic effects of oxygen on the lungs). Partial pressures of oxygen of at least 0.50 ATA are required to produce toxic effects on the lungs. This is why many oxygen bars only vend 40% oxygen. Thus, the thing that makes their product safe, also makes it effectively inert. Many dive computers will track partial pressure of oxygen and time in order to reduce probabilities of toxic effects of oxygen on the lungs.

As for very high partial pressures of oxygen (i.e., > 2 ATA -- or pure oxygen being breathed at 10 m or 33 ft), toxic effects of oxygen on the nervous system can be expressed rapidly. These are the effects that are particularly dangerous for divers, who may have a seizure underwater and drown.

Enjoy your dives -- but I wouldn't worry about the oxygen-related gimmicks.
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Last edited by wgt : 09-27-2007 at 04:40 PM.
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