Actually, if it’s a life or death matter (tsumego?
), suppressing the urge to breathe can be useful for a while… as long as you don’t pass out.
Thanks, very interesting.
Just a quick remark that that was not my own explanation, but someone else’s that I found (I put the link) and wanted some expert perspective on - which you gave me. 
Incidentally, Wim Hof would probably agree with that statement. 
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