Study Overview
The research, published in the British Medical Journal, examined former National Football League players who died between 2016 and 2021.
Investigators determined that one in four of these athletes showed evidence of chronic traumatic encephalopathy, a neurodegenerative disease associated with repeated head trauma.
The authors caution that the documented rate may be a lower bound, given the likelihood of undiagnosed cases and limited autopsy availability.
The lead author indicated that the true prevalence of CTE among former players could be even higher than the study’s findings suggest.
These results reinforce concerns about the long‑term health consequences of repeated concussions in football and may influence future safety policies.