Inclusion Criteria:  participation at the Canadian Senior National, National Development, Provincial, Sport School, Academy or Club levels of competition for skiing and snowboarding athletes, or participation in the Canadian Sport School Hockey League or Hockey Calgary U16 or first year U18 ice hockey levels of competition for hockey players between August 2021 and April 2023; male or female; assessed for a concussion or traumatic lower body injury that was sustained during an organized training session/practice or competition/game and diagnosis confirmed by a sport medicine physician; and written informed consent to participate during the 2021-2022 and 2022-2023 seasons.  Exclusion Criteria:  previous history of neurological issues such as stroke, seizure, and/or congenital intracranial abnormalities, or non-fully resolved concussion or traumatic lower body injury sustained in the 3-month period prior to the initiation of study; and non-sport-related concussions or traumatic lower body injuries.