Certain parts of the brain lost their volume as a result of repeated appearances in boxing and martial arts tournaments, in a study that monitored brain structures with magnetic resonance imaging and tracked the brainpower performance of 224 fighters over 5 years of their combat careers.

As well as shrinkage in parts of the brain, the fighters in the study suffered losses in brain processing speeds in comparison with controls who had never taken part in any type of sport that could lead to head injury.

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