Mesh:Outcome Assessment (Health Care)/methods Mesh:Outcome Assessment (Health Care)/statistics & numerical data Mesh:Adolescent Mesh:Humans Mesh:Monitoring Mesh:Ambulatory/methods* Mesh:Exercise/physiology* Mesh:Awareness/physiology* Mesh:Reproducibility of Results Mesh:Ambulatory/statistics & numerical data Mesh:Accelerometry/utilization* Mesh:Female Mesh:Male Mesh:Child Free living conditions Activity monitor Young Reactivity