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Early initiation of physical activity following concussion is associated with fewer symptoms, but the optimal activity level is unclear. This study was a planned secondary analysis of a Canadian randomized trial of early exercise initiation in children and adolescents with concussion. The exercise patterns of 267 patients (age range, 10–18 years) were assessed with accelerometers for 14 consecutive days postconcussion.
The following outcomes were noted:
On a standardized 60-point assessment of patient-reported somatic and cognitive symptoms, initial median score was 21, and median scores declined to 18, 14, and 10 points, respectively, at 1, 2, and 4 weeks (lower score indicates fewer symptoms).
Cumulative moderate-to-vigorous physical activit…