Contact sports: Head impacts saturate the brain's cleaning system

Contact sports: Head impacts overload the brain's cleaning system

November 28, 2025

By Marie Parra THE Subscribers

Head injuries are common among professionals in contact sports, particularly combat sports. American researchers have identified a function particularly sensitive to repeated head impacts: the brain's waste removal system.

World boxing championship event in Japan on November 24, 2025.

Two athletes face off in a world boxing championship event in Japan on November 24, 2025.

YUSUKE MATSUMOTO / YOMIURI / THE YOMIURI SHIMBUN VIA AFP

“ I have absolutely no recollection – and when I say no recollection, I mean absolutely no recollection – of a single second of a rugby match.“revealed the rugby player Sébastien Chabal in the podcast Legend in April 2025. Although the player has not consulted a neurologist, he does offer a hypothesis to explain his condition: the numerous impacts he has received on the field. Two British rugby players had also announced that they were suffering from early-onset dementia for the same reason.

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