• T W McAllister, L A Flashman, A Maerlender, R M Greenwald, J G Beckwith, T D Tosteson, J J Crisco, P G Brolinson, S M Duma, A-C Duhaime, M R Grove, and J H Turco.
• Department of Psychiatry, Dartmouth Medical School, Lebanon. thomas.w.mcallister@dartmouth.edu
• Neurology. 2012 May 29;78(22):1777-84.

ObjectiveTo determine whether exposure to repetitive head impacts over a single season negatively affects cognitive performance in collegiate contact sport athletes.MethodsThis is a prospective cohort study at 3 Division I National Collegiate Athletic Association athletic programs. Participants were 214 Division I college varsity football and ice hockey players who wore instrumented helmets that recorded the acceleration-time history of the head following impact, and 45 noncontact sport athletes. All athletes were assessed prior to and shortly after the season with a cognitive screening battery (ImPACT) and a subgroup of athletes also were assessed with 7 measures from a neuropsychological test battery.ResultsFew cognitive differences were found between the athlete groups at the preseason or postseason assessments. However, a higher percentage of the contact sport athletes performed more poorly than predicted postseason on a measure of new learning (California Verbal Learning Test) compared to the noncontact athletes (24% vs 3.6%; p < 0.006). On 2 postseason cognitive measures (ImPACT Reaction Time and Trails 4/B), poorer performance was significantly associated with higher scores on several head impact exposure metrics.ConclusionRepetitive head impacts over the course of a single season may negatively impact learning in some collegiate athletes. Further work is needed to assess whether such effects are short term or persistent.

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