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Modifiable factors that lead to higher injury risk in these subgroups are not clear. The purpose of this study was to identify whether external loading variables during military\u2010relevant tasks differ by age and sex in U.S. Army trainees. Data was collected on 915 trainees in the first week of Basic Combat Training. Participants performed running and ruck marching (walking with 18.1\u00a0kg pack) on a treadmill, as well as double\u2010\/single\u2010leg drop landings. Variables included: vertical force loading rates, vertical stiffness, first peak vertical forces, peak vertical and resultant tibial accelerations. Comparisons were made between sexes and age groups (young, \u226419\u00a0years; middle, 20\u201324\u00a0years; older, \u226525\u00a0years). Significant main effects of sex were found, with females showing higher vertical loading rates during ruck marching, and peak tibial accelerations during running and ruck marching (<jats:italic>p<\/jats:italic>\u00a0\u2264\u00a00.03). Males showed higher vertical stiffness during running and peak vertical tibial accelerations during drop landings (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.01). A main effect of age was found for vertical loading rates during running (<jats:italic>p<\/jats:italic>\u00a0=\u00a00.03), however no significant pairwise differences were found between age groups. These findings suggest that higher external loading may contribute to higher overall injury rates in female trainees. Further, higher stiffness during running may contribute to specific injuries, such as Achilles Tendinopathy, that are more prevalent in males. The lack of differences between age groups suggests that other factors contribute more to higher injury rates in older trainees.<\/jats:p>","DOI":"10.1002\/ejsc.12091","type":"journal-article","created":{"date-parts":[[2024,3,20]],"date-time":"2024-03-20T20:01:40Z","timestamp":1710964900000},"page":"740-749","source":"Crossref","is-referenced-by-count":1,"title":["Sex\u2010 and age\u2010related differences in kinetics and tibial accelerations during military\u2010relevant movement tasks in\u00a0U.S. Army trainees"],"prefix":"10.1002","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4945-7813","authenticated-orcid":false,"given":"Caleb D.","family":"Johnson","sequence":"first","affiliation":[{"name":"Military Performance Division United States Army Research Institute of Environmental Medicine  Natick Massachusetts USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lauren K.","family":"Sara","sequence":"additional","affiliation":[{"name":"Spaulding National Running Center Spaulding Rehabilitation Hospital  Cambridge Massachusetts USA"},{"name":"College of Health and Rehabilitation Sciences Boston University  Boston Massachusetts USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Molly M.","family":"Bradach","sequence":"additional","affiliation":[{"name":"Spaulding National Running Center Spaulding Rehabilitation Hospital  Cambridge Massachusetts USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David J.","family":"Zeppetelli","sequence":"additional","affiliation":[{"name":"Military Performance Division United States Army Research Institute of Environmental Medicine  Natick Massachusetts USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Torstein E.","family":"D\u00e6hlin","sequence":"additional","affiliation":[{"name":"School of Physical Therapy and Rehabilitation Sciences University of South Florida  Tampa Florida USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David R.","family":"Mullineaux","sequence":"additional","affiliation":[{"name":"Datamull Ltd.  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