## Appendix A. Header Kinematics by Header Type and Preceding Ball Delivery Method
; Buckley, T.A. ; Kaminski, T.W. Reducing purposeful headers from goal kicks and punts may reduce cumulative exposure to head acceleration. _Res. Sports Med._**2016**, _24_, 407-415. [CrossRef]
* Harriss et al. (2019) Harriss, A.; Johnson, A.M.; Walton, D.M. ; Dickey, J.P. Head impact magnitudes that occur from purposeful soccer heading depend on the game scenario and head impact location. _Musculoskeletal. Sci. Pract._**2019**, _40_, 53-57. [CrossRef]
* Cobb et al. (2013) Cobb, B.R. ; Urban, J.E. ; Davenport, E.M.; Rowson, S.; Duma, S.M. ; Maldjian, J.; Whitlow, C.T. ; Powers, A.K. ; Stitzel, J.D. Head Impact Exposure in Youth Football: Elementary School Ages 9-12 Years and the Effect of Practice Structure. _Ann. Biomed. Eng._**2013**, _41_, 2463-2473. [CrossRef]
* Tierney and Power (2021) Tierney, G.J. ; Power, J.; Simms, C. Force experienced by the head during heading is influenced more by speed than the mechanical properties of the football. _Scand. J. Med. Sci. Sports_**2021**, _31_, 124-131. [CrossRef]
* Tierney and Higgins (2021) Tierney, G.J. ; Higgins, B. The incidence and mechanism of heading in European professional football players over three seasons. _Scand. J. Med. Sci. Sports_**2021**, _31_, 875-883. [CrossRef]
* Tierney and Simmons (2019) Tierney, G.J. ; Simmons, C. Predictive capacity of the MADYMO multibody human body model applied to head kinematics during rugby union tackles. _Appl. Sci._**2019**, \(9\), 726. [CrossRef]
* IFAB.COM (2022) IFAB.COM. Clarification: LAW 16, the GOAL KICK. 2 August 2022. Available online: [[https://theifab.com/news/claricat-ion-law-16-the-goal-kick](https://theifab.com/news/claricat-ion-law-16-the-goal-kick)]([https://theifab.com/news/claricat-ion-law-16-the-goal-kick](https://theifab.com/news/claricat-ion-law-16-the-goal-kick)) (accessed on 12 January 2022). * Shibukawa and Hoshikawa (2022) Shibukawa, K.; Hoshikawa, Y. Decrease in aerial challenges after revision of goal kick rules in Japan Pro-fessional Soccer League: Explorative study of the possibility of a risk reduction for head injury, concussion, and brain damage by a rule revision. _Sci. Med. Foolb._**2022**, \(6\), 1-6. * Collet (2013) Collet, C. The possession game? A comparative analysis of ball retention and team success in European and interna-tional football, 2007-2010. _J. Sport. Sci._**2013**, _31_, 123-136. [CrossRef]
* Football Association (2020) Football Association. _Updated Heading Guidance Announced for Youth Training Sessions_; Football Association: London, UK, 2020. * Lynall et al. (2016) Lynall, R.C. ; Clark, M.D. ; Grand, E.E. ; Stucker, J.C.; Littleton, A.C.; Aguilar, A.J. ; Petschauer, M.A. ; Teel, E.F.; Mihalik, J.P. Head Impact Biomechanics in Women's College Soccer. _Med. Sci. Sport. Exerc._**2016**, _48_, 1772-1778. [CrossRef]
* Nevins et al. (2019) Nevins, D.; Hildenbrand, K.; Vasavada, A.; Kensrud, J.; Smith, L. In-Game Head Impact Exposure of Male and Female High School Soccer Players. _Athil. Train. Sports Health Care_**2019**, _11_, 174-182. [CrossRef]
* Hanlon and Bir (2012) Hanlon, E.M.; Bir, C.A. Real-Time Head Acceleration Measurement in Girls' Youth Soccer. _Med. Sci. Sports Exerc._**2012**, _44_, 1102-1108. [CrossRef]
* Tierney et al. (2021) Tierney, G.; Weaving, D.; Tooby, J.; Al-Dawoud, M.; Hendricks, S.; Phillips, G.; Stokes, K.A. ; Till, K.; Jones, B. Quantifying head acceleration exposure via instrumented mouthguards (iMG): A validity and fea-sibility study protocol to inform iMG suitability for the TaCKLE project. _BMJ Open Sport Exerc. Med._**2021**, \(7\), e001125. [CrossRef]
* Mackay et al. (2019) Mackay, D.F. ; Russell, E.R. ; Stewart, K.; MacLean, J.A. ; Pell, J.P.; Stewart, W. Neurodegenerative Disease Mortality among Former Professional Soccer Players. _N. Engl. J. Med._**2019**, _381_, 1801-1808. [CrossRef]
* Kaminski et al. (2007) Kaminski, T.W. ; Wikstrom, A.M.; Gutierrez, G.; Glutting, J.J. Purposeful heading during a season does not influence cognitive function or balance in female soccer players. _J. Clin. Exp. Neuropsychol._**2007**, _29_, 742-751.