Researchers find elevated biomarkers of brain injury after high-acceleration head impacts. In American football, athletes are regularly subjected to head impacts of varying intensities-;hits that may or may not produce the clinical signs and symptoms of a concussion.

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Researchers find elevated biomarkers of brain injury after high-acceleration head impacts. In American football, athletes are regularly subjected to head impacts of varying intensities-;hits that may or may not produce the clinical signs and symptoms of a concussion.