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• W2618653630 abstract "PURPOSE: The long-term neurological effects of exposure to repetitive subconcussive impacts, such as those occurring in American football, are poorly understood. Recent studies have suggested that greater exposure to subconcussive impacts is associated with worse health outcomes in former high school, collegiate, and professional football players. Helmet accelerometer research has shown the magnitude, location, and frequency of impacts sustained by American football players varies widely and are dependent on many factors, including position, practice structure, playing time, and career duration. Thus, estimating cumulative head impact exposure across a player’s career using these factors may prove useful in studying their long-term effects. Previously, our research center developed the head impact exposure estimate (HIEE), a structured interview covering game and practice contact hours over the course of an athlete’s playing career. However, the test-retest reliability of the HIEE is unknown. METHODS: We examined the test-retest reliability of the HIEE in 11 retired professional football athletes (mean age: 64.7 +/- 3.13y). The HIEE was administered by two raters over two occasions with a mean period of separation of 4.4 +/- 0.42y. Intra-class correlation coefficients, ICC(2,1), were used to quantify agreement between HIEE assessments. We calculated ICC(2,1) values for the overall HIEE, as well as the two subcomponents of practice- and game-weighted contact hours. P-values were determined for the test of ICC=0 and 95% confidence intervals were calculated. RESULTS: The mean HIEE at assessment 1 was 3423.76 +/- 1406.02hrs while at assessment 2, the mean was 2627.68 +/- 819.56hrs (t10=1.75, P=0.11). The overall ICC(2,1) for the HIEE was 0.124 (P = 0.33; 95% CI: -0.36, 0.62). The ICC(2,1) for weighted practice contact hours was 0.111 (P = 0.36; 95% CI: -0.44, 0.63) and for weighted game contact hours was 0.330 (P=0.01; 95% CI: -0.11, 0.75). CONCLUSIONS: Overall, the head impact exposure estimate had poor reliability. The subcomponent of game contact hours was more reliable than practice contact hours. The reported number of contact practices per week appears to be the major factor reducing reliability. A more explicit definition of a “contact practice” may improve reliability." @default.
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• W2618653630 date "2017-05-01" @default.
• W2618653630 modified "2023-09-26" @default.
• W2618653630 title "Reliability of the Head Impact Exposure Estimate in Former Professional Football Athletes" @default.
• W2618653630 doi "https://doi.org/10.1249/01.mss.0000518046.95703.ff" @default.
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