MooJuice

Knocked out is when your brain shuts out your CNS and peripherals due to damage/a lack of oxygen to the brain.

I have been both choked out and knocked out, and they felt similar. (choked out was more comfortable tho)

i have a question tho: since being knocked out is directly cranium/brain related, how is it that one can put a friend unconscious by having them hyperventolate and then squeezing their chest hard? i have done it to others and had it done to me, and it feels just like being choked out. your entire brain resets and reboots. but why? I dont understand - nothing touches your neck or head, in fact nothing feels uncomfortable. you just pass out.

im gonna google it now but i was just curious as to the principles behind it.. being a med students and also an avid mma fan i get quite curious about these things

Dempsey Roll

Well, since you're hyperventilating your brain is already suffering from a lack of oxygen, and if you press on their chest it prevents their lungs from expanding properly and keeps them from taking any deep breaths. It's the same principle as a choke, albeit through a different method. Depriving the brain of oxygen.

I'd like to point out, however, that a knockout it totally different and is much worse for you, seeing as you're actually experiencing a traumatic brain injury rather than a momentary lack of oxygen.

__________________
"I don't want them to like me, because when I'm in the ring, punches fly to the face. It is not a tenderness time. I am not falling in love. And he knows that when the fight starts I am kicking faces."
- Wanderlei Silva