OBJECTIVE: To determine the efficacy of early physical activity and behavioral management for acute concussion in pediatric patients. STUDY DESIGN: A multicenter, prospective, 2x2 factorial randomized controlled trial was conducted among patients aged 11 to 24 years who presented within 72 hours of injury. Participants were randomized into four groups based on early physical activity (or usual care) and behavioral management (or none). The early activity group was encouraged to meet step targets despite symptoms. The primary outcomes were post-concussion symptom severity and quality of life at 14 days post-enrollment. RESULTS: A total of 239 participants were randomized, and 210 completed all study procedures. The early activity group demonstrated higher daily step counts compared with the usual care group. However, no significant differences were observed in post-concussion symptom severity or quality of life at 14 days between groups. The early activity group experienced higher daily post-concussion symptom severity during the first 7 days and took longer to recover compared with the usual care group. Behavioral management showed no effect on outcomes. CONCLUSIONS: Early prescribed physical activity and behavioral management did not improve post-concussion outcomes in the first two weeks following injury. Early prescribed activity despite symptoms was associated with delayed symptom resolution.

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