title: Measurement of free-range activity in children as modified by social and environmental complexity.
mesh_terms: D002675:Child, Preschool; D004777:Environment; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008722:Methods; D009043:Motor Activity; D010988:Play and Playthings; D012737:Sex Factors; D012919:Social Behavior; D013686:Telemetry / Q000295:instrumentation