## Appendix A. Header Kinematics by Header Type and Preceding Ball Delivery Method  
\begin{tabular}{c c c c c} \hline \hline \hline  & & **PLA** & & **PAA** \\  & **N = 133** & & **(g)** & **(krad/s\({}^{2}\))** \\ \cline{2-6}  & & **Median** & **[Q1,Q3]** & **Median** & **[Q1,Q3]** \\ \hline \multicolumn{6}{c}{**Header Type**} \\ \hline Clearance & n = 24 & 11.4 & [8.4,17.6] & 1091.5 & [826.5,1459.5] \\ Flick-on & n = 30 & 13.6 & [10.0,17.1] & 1255 & [775.8,1925.3] \\ Headed Control & n = 5 & 8.6 & [7.8,15.9] & 930 & [529.0,1616.5] \\ Interception & n = 19 & 13.4 & [11.0,18.5] & 1349 & [675.0,1663.0] \\ Pass & n = 50 & 13.7 & [11.2,17.9] & 893.5 & [532.3,1342.8] \\ Shot & n = 5 & 15.9 & [7.7,18.1] & 1686 & [765.0,3013.5] \\ \hline \multicolumn{6}{c}{**Ball Delivery Method**} \\ \hline Cross & n = 13 & 8.9 & [7,12.5] & 1165 & [275.0,1554.5] \\ Goal Kick & n = 18 & 15.85 & [12.08,21] & 1451.5 & [1018.5,2071.8] \\ Long Ball & n = 42 &* Filben et al. (2021) Filben, T.M. ; Pritchard, N.S. ; Hanes-Romano, K.E. ; Miller, L.E. ; Miles, C.M. ; Urban, J.E. ; Stitzel, J.D. Comparison of women's collegiate soccer header kinematics by play state, intent, and outcome. _J. Biomech._**2021**, _126_, 110619. [CrossRef]
* _Lamond et al. (2018)_ Lamond, L.C. ; Caccese, J.B.; Buckley, T.A. ; Glutting, J.; Kaminski, T.W. Linear acceleration in direct head contact across impact type, player position, and playing scenario in collegiate women's soccer players. _J. Athl. Train._**2018**, _53_, 115-121. [CrossRef]
* _Broglio et al. (2017)_ Broglio, S.P. ; Lapointe, A.; O'Connor, K.L. ; McCrea, M. Head Impact Density: A Model To Explain the Elusive Concussion Threshold. _J. Neurotraum_**2017**, _34_, 2675-2683. [CrossRef]
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* _Reilly (1976)_ Reilly, T.R. Time motion studies of soccer. _J. Hum. Mov. Stud._**1976**, \(2\), 78-97. * _Tysvaer and Storli (1981)_ Tysvaer, A.; Storli, O. Association football injuries to the brain. A preliminary report. _Br. J. Sport. Med._**1981**, _15_, 163-166. [CrossRef]
* _Matser et al. (1998)_ Matser, J.T. ; Kessels, A.; Jordan, B.D. ; Lezak, M.D. ; Troost, J. Chronic traumatic brain injury in professional soccer players. _Neurology_**1998**, _51_, 791-796. [CrossRef]
* _Witol et al. (2003)_ Witol, A.D.; Webbe, F.M. Soccer heading frequency predicts neuropsychological deficits. _Arch. Clin. Neuropsychol._**2003**, _18_, 397-417. [CrossRef]
* _Matser et al. (2001)_ Matser, J.; Kessels, A.; Lezak, M.; Troost, J. A Dose-Response Relation of Headers and Concussions With Cognitive Impairment in Professional Soccer Players. _J. Clin. Exp. Neuropsychol._**2001**, _23_, 770-774. [CrossRef]
* _Cutskiewicz et al. (2002)_ Cutskiewicz, K.M. ; Marshall, S.; Broglio, S.P. ; Cantu, R.C. ; Kirkendall, D.T. No Evidence of Impaired Neurocognitive Performance in Collegiate Soccer Players. _Am. J. Sports Med._**2002**, _30_, 157-162. [CrossRef]
* _McCrory et al. (2003)_ McCry, P.R.