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  #101  
Old 05-14-2013
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Re: DIY - discussion on building a DIY hookah diving compressor

Just a quick question about holding one's breath on an ascent after breathing compressed air. Wouldn't one naturally want to exhale as the chest expands? I've been a diver for almost 30 years and a snorkeler for almost 45 years. I've compacted the air in my lungs on the surface for a deeper free dive and it's difficult to slurp in a little more air. It's hard for me to imagine someone holding their breath and popping their lungs without warning signs from the body, but I read the warnings all the time on the internet.
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  #102  
Old 05-14-2013
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Re: DIY - discussion on building a DIY hookah diving compressor

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Originally Posted by erps View Post
Just a quick question about holding one's breath on an ascent after breathing compressed air. Wouldn't one naturally want to exhale as the chest expands?
It's not natural to want to exhale as you ascend. You have to train yourself to do it until it becomes second nature.
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  #103  
Old 05-14-2013
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Re: DIY - discussion on building a DIY hookah diving compressor

erps-
Have you ever overeaten "until you were stuffed" perhaps at a holiday dinner? Stomache is fully distended, stuffed, but folks keep eating.
Similar for the lungs, they may be full but someone is tense and afraid to exhale and lose air. IIRC the lungs can burst with as little as a 4psi pressure difference, and the kicker is that normally there may be "thin spots" in the lungs, that present no problem when there is no pressure differential on them. But with compressed air, if a thin spot blows out, now you've got pneumothorax and a problem.
Akin to the way you may have been told not to hold your nose & mouth when you sneeze, because your lungs can blow out your eardrums.

I don't conciously exhale while surfacing, but I had problems learning to control my breath with an open nose in the water. Eventually "trained" my throat to just hold back the water pressure and on the way up, to allow air to leak out as it needs to. Which is probably not describing it accurately, but the air goes out and the pressure stays balanced.

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  #104  
Old 05-14-2013
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Re: DIY - discussion on building a DIY hookah diving compressor

The concern over expanding air is not that your lung will explode like a popped balloon, although, that would happen in the extreme. Its the expansion of air in the tiniest sacks, the alveoli, where the blood-gas exchange takes place. Burst a few of those, introduce air into the blood stream and you would be fortunate with paralysis from the embolism. The odds of heart failure or a stroke are what could kill you. As the air expands in those little sacs, its need a place to vent to or they will rupture long before you feel your lungs are over inflated.
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Old 05-14-2013
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Re: DIY - discussion on building a DIY hookah diving compressor

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Originally Posted by Minnewaska View Post
Its the expansion of air in the tiniest sacks, the alveoli, where the blood-gas exchange takes place.
Exactly. And that can happen long before you ever feel like your lungs are full.
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