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lüll Repetitive head impact exposure and later-life plasma total tau in former National Football League players Alosco ML; Tripodis Y; Jarnagin J; Baugh CM; Martin B; Chaisson CE; Estochen N; Song L; Cantu RC; Jeromin A; Stern RAAlzheimers Dement (Amst) 2017[]; 7 (ä): 33-40INTRODUCTION: Blood protein analysis of total tau (t-tau) may be a practical screening biomarker for chronic traumatic encephalopathy (CTE), a neurodegenerative tauopathy associated with repetitive head impact (RHI) exposure. We examined plasma t-tau in symptomatic former National Football League (NFL) players compared with controls and the relationship between RHI exposure and later-life plasma t-tau. METHODS: Ninety-six former NFL players (age 40-69) and 25 same-age controls underwent blood draw to determine plasma t-tau levels. The cumulative head impact index (CHII) quantified RHI exposure. Subjects completed measures of clinical function. RESULTS: A higher CHII predicted greater plasma t-tau in the former NFL players (P = .0137). No group differences in plasma t-tau emerged, but a concentration >/=3.56 pg/mL was 100% specific to former NFL players. Plasma t-tau did not predict clinical function. DISCUSSION: Greater RHI exposure predicted higher later-life plasma t-tau concentrations, and further study on plasma t-tau as a candidate screening biomarker for CTE is warranted.ä |