Patrick McKeown explains how breathing hard reduces oxygen delivery. Check Oxygen Advantage at: http://oxygenadvantage.com/

If we breathe hard we are getting rid of gas carbon dioxide.
You get rid of CO2 in blood they constrict.

If you slow down your breath carbon dioxide increases.
Within 3 minutes of slowing down, you experience water in the mouth.
And this is a sign of parasympathetic nervous system.
   • Autonomic Nervous System  Oxygen Adv...  

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