BACKGROUND AND OBJECTIVE For children and adolescents,guidelines for return to play following concussion recommend a gradual increase in activity, with monitoring for post-concussive symptoms. The authors examined the effect of exercise on PCS and cognition in children and adolescents following the resolution of symptoms post-concussion.METHODS This study included 41 males and 39 females, ranging in age from eight to 18 years, each of whom had been diagnosed with a concussion at an emergency room visit,(CON group). Healthy controls,(HC group), were also recruited, comprising non-injured adoles-