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With all due respect Richard, hyperventilating prior to doing underwater swims is extremely dangerous and has not been taught for quite some time due to the increased chance of shallow water blackout. Hyperventilating causes an artificially lowered CO2 level and it is the CO2 receiptors that tells the body it is time to breath. That's why those little exhalation decrease the desire to breath.
x/S
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Last edited by exsquid; 08-13-2009 at 07:46.
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