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Knockout
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A knockout (also referred to as a K.O.) is a winning criterion in several full-contact combat sports, such as boxing, kickboxing, Muay Thai, mixed martial arts and others sports involving striking. A knockout is usually awarded when one participant is unable to rise from the canvas within a specified period of time, typically because of fatigue, injury (serious or temporarily incapacitating, e.g.

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A knockout (also referred to as a K.O.) is a winning criterion in several full-contact combat sports, such as boxing, kickboxing, Muay Thai, mixed martial arts and others sports involving striking. A knockout is usually awarded when one participant is unable to rise from the canvas within a specified period of time, typically because of fatigue, injury (serious or temporarily incapacitating, e.g. a bleeding cut above the eye can blind a fighter), loss of balance, or unconsciousness; that is, the person may literally be knocked out. A technical knockout (also referred to as a T.K.O.) is often declared when the referee or other judges (such as official ring physician, the fighter, or the fighter's cornermen) decide that a fighter cannot continue the match, even though he did not fail the count, or, in many regions, a fighter has been knocked down three times in one round. British records refer to TKOs as either "retired", if the fighter refuses to continue, or "R.S.F.", for Referee Stopped Fight.
In amateur boxing, a knockout is scored as "RSC," for Referee Stopped Contest. A technical knockout ("Outclassed") can also be declared if a fighter is ahead by 15 points in a bout.
Physical characteristics
There is actually very little known about what exactly causes a knockout but many agree it has to do with minor trauma to the brain stem. This usually happens when the head rotates sharply, often caused by a strike. A common misconception is that a knockout is caused by compression put on the carotid arteries in the neck restricting blood flow, but this is in fact how a choke out works. A basic principle of boxing is to defend against this vulnerability by keeping both hands raised about the face.
A fighter who suffers a concussion and becomes unconscious from a strike with sufficient knockout power is referred to as having been knocked out or kayoed (KO'd). Losing balance without losing consciousness is referred to as being knocked down ("down but not out"). Repeated blows to the head are known to gradually cause permanent brain damage, with Alzheimer's- or Parkinson's-like symptoms, and in severe cases may cause strokes or paralysis. This is commonly known as becoming "punch-drunk". Because of this, many physicians advise against sports involving knockouts.
Fighters who lose by knockout (either by ten count or technical) are automatically suspended thirty days, three months if it is the second knockout within three months, or one year if it is the third knockout within one year. In AIBA competition, this does not apply if a fighter loses by a technical knockout outclassed, when a fighter is behind more than 20 points -- 15 for junior levels -- in any round except the final round.
As a winning outcome
In boxing, a knockout occurs when a fighter is knocked down and does not get up within 10 seconds, as counted by the referee.
Knockdown
A knockdown occurs when a fighter touches the floor of the ring with any part of his body other than his feet following a hit. The term is also used if the fighter is hanging on to the ropes, caught between the ropes, or is hanging over the ropes and is unable to fall to the floor and cannot protect him or her self. A knockdown triggers a count by the referee; if the fighter fails the count, then the fight is ended as a K.O.
A flash knockdown is a knockdown where the fighter hits the canvas but recovers quickly enough that a count is not started.
See also
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