Please cite as: Boisgontier, M.P., Cheval, B., Schmidt, J. (2019). Engagement in daily life physical activity reduces self-reported symptoms in adolescent concussion. SportRχiv. https://doi.org/10.31236/osf.io/nhg6c ABSTRACT Background: Concussion is a common injury in an adolescent population with up to 20% experiencing persistent symptoms. Rehabilitation programs that include aerobic exercises can reduce persistent postconcussion symptoms, however it is unclear if daily-life physical activities can also reduce symptoms. Purpose: To investigate whether the level of daily life physical activity reduces postconcussion symptoms in adolescents. Methods: Ten adolescents aged 11-18 years with a concussion self-reported their postconcussion symptoms and level of physical activity at 1, 3, and 6 months after injury. The extent to which physical activity explained postconcussion health was analyzed using linear mixed modeling. Results: Higher levels of daily-life physical activity were associated with fewer somatic and cognitive symptoms, irrespective of age, gender, and time postconcussion. Implications: These findings suggest that daily life physical activity, including engagement in physical education class, sports, or active games, should be encouraged by Occupational Therapists to promote concussion recovery.