What is the science behind a sleeper/chokehold?

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What happens physiologically to make someone unconscious during this kind of hold? How do you know you’re not suffocating someone or causing serious damage?

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I’ve practiced a small amount of Brazilian jiu jitsu. They way my instructor explained it is as such: There are three straws in your neck. On brings oxygen to the lungs, one brings blood to the brain, one removes blood from the brain. The goal of a choke hold is to pinch all three straws.

It takes a bit of technique to accomplish, but if you can pinch off the arteries on the sides of the neck unconsciousness can happen in seconds. It happened to me once. One minute I was rolling with a partner, the next I was waking up on the mat with my instructor sitting near me watching me to make sure I came back. I don’t remember any sensation of loosing consciousness. There was no perception of a problem. There were no thoughts “I am being choked, I need to do something or I am going to loose consciousness. ” I was just out.

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