Stemper BD, Shah AS, Harezlak, J, et al. - Researchers examined how the 2017 National Collegiate Athletic Association (NCAA) rule change to abolish two-a-day preseason practices influenced head impact exposure in Division I college football athletes. For this purpose, they quantified head impact exposure among 342 unique athletes from five NCAA Division I Football Bowl Subdivision (FBS) programs. Finding revealed no reduction in the head impact burden during the football preseason following the 2017 NCAA ruling. Additionally, they noted a significantly higher number of recorded head impacts per week (+ 40%) among athletes during the preseason vs the regular season, suggesting the preseason as a time of elevated repetitive head impact burden. As repetitive head impact exposure is increasingly correlated with a concussion, predisposition to a higher risk of concussion among certain athletes is observed with increased preseason exposure during the preseason and regular season. Accordingly, they recommend including a reduction in overall head impact exposure in efforts at reducing concussion incidence in contact sports.