I would think, given aikido's roots, where you would pin an opponent and kill them, a choke would be looked at as taking too long?
Quote:
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If you render someone unconscious due to lack of oxygen-carrying blood to the brain, you better be damn sure you can revive them if need be.
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From what I know, things like the vascular neck restraint are incredibly safe. Judo has used them for decades with no reported deaths.
Linky:
http://www.lvrj.com/news/proper-use-...-75766857.html