{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,12]],"date-time":"2026-03-12T08:13:57Z","timestamp":1773303237017,"version":"3.50.1"},"reference-count":58,"publisher":"Cambridge University Press (CUP)","issue":"2","license":[{"start":{"date-parts":[[2020,8,7]],"date-time":"2020-08-07T00:00:00Z","timestamp":1596758400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Int Neuropsychol Soc"],"published-print":{"date-parts":[[2021,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec id=\"S1355617720000685_as1\"><jats:title>Objectives:<\/jats:title><jats:p>Head impact exposure (HIE) in youth football is a public health concern. The objective of this study was to determine if one season of HIE in youth football was related to cognitive changes.<\/jats:p><\/jats:sec><jats:sec id=\"S1355617720000685_as2\"><jats:title>Method:<\/jats:title><jats:p>Over 200 participants (ages 9\u201313) wore instrumented helmets for practices and games to measure the amount of HIE sustained over one season. Pre- and post-season neuropsychological tests were completed. Test score changes were calculated adjusting for practice effects and regression to the mean and used as the dependent variables. Regression models were calculated with HIE variables predicting neuropsychological test score changes.<\/jats:p><\/jats:sec><jats:sec id=\"S1355617720000685_as3\"><jats:title>Results:<\/jats:title><jats:p>For the full sample, a small effect was found with season average rotational values predicting changes in list-learning such that HIE was related to negative score change: standardized beta (<jats:italic>\u03b2<\/jats:italic>) = -.147, <jats:italic>t<\/jats:italic>(205) = -2.12, and <jats:italic>p<\/jats:italic> = .035. When analyzed by age clusters (9\u201310, 11\u201313) and adding participant weight to models, the <jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup> values increased. Splitting groups by weight (median split), found heavier members of the 9\u201310 cohort with significantly greater change than lighter members. Additionaly, significantly more participants had clinically meaningful negative changes: <jats:italic>X<\/jats:italic><jats:sup>2<\/jats:sup> = 10.343, <jats:italic>p<\/jats:italic> = .001.<\/jats:p><\/jats:sec><jats:sec id=\"S1355617720000685_as4\"><jats:title>Conclusion:<\/jats:title><jats:p>These findings suggest that in the 9\u201310 age cluster, the average seasonal level of HIE had inverse, negative relationships with cognitive change over one season that was not found in the older group. The mediation effects of age and weight have not been explored previously and appear to contribute to the effects of HIE on cognition in youth football players.<\/jats:p><\/jats:sec>","DOI":"10.1017\/s1355617720000685","type":"journal-article","created":{"date-parts":[[2020,8,7]],"date-time":"2020-08-07T04:34:02Z","timestamp":1596774842000},"page":"113-123","source":"Crossref","is-referenced-by-count":11,"title":["Neuropsychological Change After a Single Season of Head Impact Exposure in Youth Football"],"prefix":"10.1017","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9740-6354","authenticated-orcid":false,"given":"Arthur","family":"Maerlender","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eric","family":"Smith","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"P. 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