Time Delta Head Impact Frequency: An Analysis on Head Impact Exposure in the Lead Up to a Concussion: Findings from the NCAA-DOD Care Consortium.

"Conflict of interest No benefits in any form have been or will be received from a commercial party related directly or indirectly to the subject of this manuscript."

"Research reported in this publication was supported by the National Institute of Neurological Disorders and Stroke of the National Institutes of Health under Award Number 1R01NS126449. This publication was also made possible with support from the Grand Alliance Concussion Assessment, Research, and Education (CARE) Consortium, funded in part by the National Collegiate Athletic Association (NCAA) and the Department of Defense (DOD). The U.S. Army Medical Research Acquisition Activity, 820 Chandler Street, Fort Detrick MD 21702-5014 is the awarding and administering acquisition office. This work was supported by the Office of the Assistant Secretary of Defense for Health Affairs through the Psychological Health and Traumatic Brain Injury Program under Award NO W81XWH-14-2-0151. Opinions, interpretations, conclusions and recommendations are those of the author and are not necessarily endorsed by the Department of Defense (DHP funds). This study was also supported by Veterans Affairs Medical Research. The authors would also like to thank Jody Harland, MS, Janetta Matesan, BA, Michael Menser, Larry Riggen, MS (Indiana University School of Medicine); Ashley Rettmann, BS, Nicole L’Heureux, MBA (University of Michigan); Melissa Koschnitzke, MA (Medical College of Wisconsin); Michael Jarrett, MBA, Vibeke Brinck, MS and Bianca Byrne, BA (Quesgen); Melissa Baker, BS (Datalys Center for Sports Injury Research and Prevention); and the research and medical staff at each of the CARE participation sites. The team would also like to acknowledge the HIT System operators that participated in this study: Julia Ford (UNC), Philippe Gagnon-Joseph (UNC), Miranda Kruse (UNC), Gus Hendricks (UCLA), Quinn Lukens (UW), Brett Griesemer (VT), Alex Black (VT), Lewis Young (VT), Dom Calhoun (USAFA), Mike Aderman (USMA), Sean Roach (USMA), and Jeremy Ross (USMA)."