Fighters' brains damaged long before symptoms emerge, study hints

Boxers and mixed martial arts fighters begin losing brain volume — as brain cells die — after six years of fighting, a yearlong study finds. Those who fight longer than 12 years expose themselves to an even greater decline each time they return.A yearlong study of boxers' and mixed martial-arts fighters' brain activity has found those who fight for more than six years begin to experience damage and those who fight longer than 12 years expose themselves to an even greater decline each time they return to the ring.

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