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I just came across some information on the vagus nerve. If it is stumulated, - which can be done by swallowing or by having cold water on or around your face - it can cause the heart to slow and even cause fainting.

http://www.thesurvivaldoctor.com/2012/10/25/fast-heart-rate/

http://en.wikipedia.org/wiki/Vasovagal_response

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