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Old 07-25-2012, 07:16 AM   #65
hogphish
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Join Date: Jun 2011
Location: Stuart
Posts: 486
Re: Advice on spearfishing alone

I have been involved with dozens of BO's. Everyone of them had closed mouths because of their no snorkel in mouth dive training. After several minutes of laryngospasm the midbrain reflexively tells you to take an agonal respiration in a final survival attempt. This is when you flood your lungs. An unconscious diver with a snorkel (water funnel) risks loosing those precious 2-3 minutes of dry lungs. The snorkel purge would contribute to a blackout as well. This causes decreased venous return and an accelerated drop in the already low percent of oxygen in the lungs and blood, a slight decrease in cardiac filling and decreased cardiac output. That is why we hook breath upon surfacing, a technique borrowed from high G turn tolerance (pilots)

Last edited by hogphish; 07-25-2012 at 07:25 AM.
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