Effects of contact/collision sport history on gait in early- to mid-adulthood.

"Competing interests Dr. Hunzinger is an independent contractor with USA Rugby as a World Rugby Educator for the Strength and Conditioning and Referee Strands. Dr. Meehan receives royalties from (1) ABC-Clio publishing for the sale of his books, Kids, sports, and concussion: A guide for coaches and parents, and concussions; (2) Springer International for the book Head and neck injuries in young athlete, and (3) Wolters Kluwer for working as an author for UpToDate. His research is funded, in part, by philanthropic support from the National Hockey League Alumni Association through the Corey C. Griffin Pro-Am Tournament, and a grant from the National Football League. All the supporting entities had no involvement in the study design and writing of the manuscript or the decision to submit it for publication. The other authors have nothing to disclose."

"AcknowledgmentsThe authors thank all the participants who participated in this study and all the collaborators and friends who helped share our study flyers to promote participant recruitment. This study and publication were made possible and funded in part by the University of Delaware Unidel Distinguished Graduate Scholars Fellowship and Department of Kinesiology and Applied Physiology Doctoral Research Fund. Additionally, Dr. Hunzinger acknowledges funding support in part by the Department of Defense grant W81XWH-21-1-0590, the Penn Injury Science Center, and National Institutes of Health/National Institute of Neurological Disorders and Stroke brain injury training grant T32 NS043126. Opinions, interpretations, conclusions, and recommendations are those of the authors and are not necessarily endorsed by the Department of Defense. Competing interestsDr. Hunzinger is an independent contractor with USA Rugby as a World Rugby Educator for the Strength and Conditioning and Referee Strands. Dr. Meehan receives royalties from (1) ABC-Clio publishing for the sale of his books, Kids, sports, and concussion: A guide for coaches and parents, and concussions; (2) Springer International for the book Head and neck injuries in young athlete, and (3) Wolters Kluwer for working as an author for UpToDate. His research is funded, in part, by philanthropic support from the National Hockey League Alumni Association through the Corey C. Griffin Pro-Am Tournament, and a grant from the National Football League. All the supporting entities had no involvement in the study design and writing of the manuscript or the decision to submit it for publication. The other authors have nothing to disclose."