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Measurements of ground reaction forces and segment kinematics during sprint starts performed during a training session revealed that positioning the foot further behind the center of mass at initial contact significantly correlated with shorter contact times, greater average horizontal forces, and increased net joint moment impulse on the knee during the impact phase. Increases in average horizontal forces were significantly correlated with smaller magnitudes of shank angular velocity during the impact phase and shorter times to peak thigh angular velocity during the postimpact phase. We also used kinetic and kinematic data to provide feedback regarding an athlete\u2019s mechanics to coaches for use within a training session on the track.<\/jats:p>","DOI":"10.1123\/jab.2024-0201","type":"journal-article","created":{"date-parts":[[2026,5,18]],"date-time":"2026-05-18T19:01:34Z","timestamp":1779130894000},"page":"425-433","source":"Crossref","is-referenced-by-count":0,"title":["Influence of Body Configuration on Kinetics and Multijoint Control Strategies Sprinters Use During the First Step Out of Blocks"],"prefix":"10.1123","volume":"42","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6613-7462","authenticated-orcid":true,"given":"Harper E.","family":"Stewart","sequence":"first","affiliation":[{"name":"Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2524-2976","authenticated-orcid":true,"given":"Rand R.","family":"Wilcox","sequence":"additional","affiliation":[{"name":"Department of Psychology, University of Southern California, Los Angeles, CA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8569-2653","authenticated-orcid":true,"given":"Jill L.","family":"McNitt-Gray","sequence":"additional","affiliation":[{"name":"Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA"},{"name":"Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"100","reference":[{"key":"r1","series-title":"The Biomechanics of Sports Techniques","author":"Hay JG","year":"1993","unstructured":"Hay JG. 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