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This study\u2019s objectives were to compare equestrian helmet impact response kinematics between linear-driven and oblique impact conditions and then to evaluate the effect of incorporating oblique drop tests into a previously established equestrian helmet rating system, Equestrian STAR.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Methods<\/jats:title>\n            <jats:p>Oblique drop tests were conducted with 45 equestrian helmet models at two impact locations, front boss and rear boss, at an impact velocity of 6.56\u00a0m\/s. The resulting peak linear and rotational head accelerations were compared to those measured during linear-driven pendulum impacts on the same helmet models. A total of 720 impact tests were performed, making this the largest published study on equestrian helmets to date. Equestrian STAR was modified to include both pendulum and oblique impacts by computing and summing weighted concussion risks for each test condition.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>Oblique impacts had peak linear accelerations ranging from 105.8 to 204.5\u00a0g and peak rotational accelerations ranging from 3304 to 13854\u00a0rad\/s<jats:sup>2<\/jats:sup>. Between the linear-driven and oblique impacts, peak linear acceleration was weakly correlated (<jats:italic>R<\/jats:italic>\n              <jats:sup>2<\/jats:sup> =\u20090.34, <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001), while peak rotational acceleration was not correlated (<jats:italic>R<\/jats:italic>\n              <jats:sup>2<\/jats:sup>\u2009=\u20090.04, <jats:italic>p<\/jats:italic>\u2009=\u20090.21). Equestrian STAR scores calculated using both pendulum and oblique impacts suggested that the worst-performing helmet on both systems had nearly four times the concussion risk as the best-performing.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>Pendulum and oblique impacts have different methods of generating head rotation, which can highlight different modes of helmet performance. The updated Equestrian STAR helmet rating system differentiates between high-performing and low-performing helmets, enabling equestrians to purchase helmets best at reducing concussion risk and providing companies with a process to compare their helmet designs.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1007\/s10439-025-03723-0","type":"journal-article","created":{"date-parts":[[2025,4,28]],"date-time":"2025-04-28T10:11:54Z","timestamp":1745835114000},"page":"2309-2332","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Equestrian STAR: Development of an Experimental Methodology for Assessing the Biomechanical Performance of Equestrian Helmets"],"prefix":"10.1007","volume":"53","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3626-035X","authenticated-orcid":false,"given":"Lauren A.","family":"Duma","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4361-2704","authenticated-orcid":false,"given":"Mark T.","family":"Begonia","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Barry","family":"Miller","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-3341-8837","authenticated-orcid":false,"given":"Caitlyn","family":"Jung","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew","family":"Wood","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7971-3705","authenticated-orcid":false,"given":"Brock G.","family":"Duma","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3227-0596","authenticated-orcid":false,"given":"Steve","family":"Rowson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,4,28]]},"reference":[{"issue":"1","key":"3723_CR1","doi-asserted-by":"publisher","first-page":"79","DOI":"10.1177\/145749690709600115","volume":"96","author":"EH Carrillo","year":"2007","unstructured":"Carrillo, E. 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