The goal of this study is to investigate when is the best time to resume physical activity
following a head injury. Two treatment plans will be studied; the first treatment plan
consists of gradually reintroducing physical activity in the child's routine, starting 72
hours following the head injury. The second treatment plan involves physical and mental rest
until the child as no more symptoms. Once symptom free, physical activity is gradually
reintroduced in the child's routine.