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We recommend very strongly that you don't try this at home. The intention of the video is to demonstrate just how effective a submission the Rear Naked choke is. It's not about power and size, just proper technique.
Compare for example a girl of the same size trying a punch or kick. Even on a compliant partner, no on is going to sleep. This is not at all to say that jiu-jitsu is better than the striking arts. It is simply demonstrating that jiu-jitsu works frighteningly well.
Uploaded with permission of content owner, our friend coach Jet Hermida.
Where Does The Name Come From?
The Rear Naked choke (RNC) is a chokehold in martial arts applied from an opponent's back. Depending on the context, the term may refer to one of two variations of the technique; either arm can be used to apply the choke in both cases.
The term Rear Naked choke originated from the technique in Jiu-Jitsu and Judo known as the "Hadaka Jime", or on English "Naked Strangle". The word "naked" in this context suggests that, unlike many other strangulation techniques found in Jiu-Jitsu/Judo, this hold does not require the use of a keikogi ("gi") or training uniform. So it is choke that works without using any clothing.
How Does The Choke Work?
To understand what happens when the Rear Naked choke is correctly applied, it's useful to know some basic anatomical definitions:
•Carotid body: Important regulator of blood pressure at the bifurcation of the common carotid into the internal and external carotid arteries.
•Common carotid: Artery that is the target of the RNC, encased in the carotid sheath and running alongside the vagus nerve and jugular vein underneath the sternocleidomastoid.
•Jugular vein: Large vein of the neck, and the primary source of blood to the brain.
•Paired vertebral arteries: Arteries running alongside the cervical spine in the back of the neck, which also provide blood to the brain.
•Sternocleidomastoid: Large muscle, one on either side of the trachea/thyroid cartilage, that turns and flexes the head.
•Thyroid cartilage: Adam’s apple.Vagus nerves: A pair of nerves originating at the brainstem and running up the head.
Application of the RNC first causes compression of the jugular vein, significantly hindering blood return from the head (and brain) to the heart. The recipient begins to feel flushed – engorged in the face and brow. Further pressure narrows the carotids and reduces the blood flow to the brain.
The best explanation of how to execute a Rear Naked choke come from New Zealand's John Danaher, via BJJ Fanatics.