title: Calibration of the RT3 accelerometer for various patterns of physical activity in children and adolescents.
abstract: The aim of this study was to determine thresholds for various intensities of physical activity in children and adolescents using the RT3 accelerometer. Forty healthy participants aged 10-16 years were recruited to the study. To validate the RT3 accelerometer data, an independent sample of 20 children and adolescents aged 10-16 years performed the same activities. Accelerometer data, heart rate, and oxygen consumption were measured at nine levels of physical activity, which varied in intensity: sedentary, light, moderate, and vigorous. Age and sex did not affect thresholds. The activity categories and accelerometer counts were: sedentary activity, 0-40 counts x min(-1); light activity, 41-950 counts x min(-1); moderate activity, 951-3410 counts x min(-1); and vigorous activity, >3410 counts x min(-1), respectively. These thresholds were considered valid as the difference between threshold values obtained using two independent groups of children was not significant. This study has established threshold values for various physical activities and enables the RT3 accelerometer to be used to quantify the duration of various levels of activity in adolescents under free-living conditions.
authors.affiliation: Laboratoire RELACS, Université du Littoral Côte d'Opale, Dunkerque. jeremy.vanhelst@hotmail.fr
authors.forename: Jeremy
authors.initials: J
authors.lastname: Vanhelst
authors.forename: Laurent
authors.initials: L
authors.lastname: Béghin
authors.forename: Patrick
authors.initials: P
authors.lastname: Rasoamanana
authors.forename: Denis
authors.initials: D
authors.lastname: Theunynck
authors.forename: Touffik
authors.initials: T
authors.lastname: Meskini
authors.forename: Catalina
authors.initials: C
authors.lastname: Iliescu
authors.forename: Alain
authors.initials: A
authors.lastname: Duhamel
authors.forename: Dominique
authors.initials: D
authors.lastname: Turck
authors.forename: Frédéric
authors.initials: F
authors.lastname: Gottrand
mesh_terms: D000293:Adolescent; D002648:Child; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D009043:Motor Activity; D005082:Physical Exertion; D012016:Reference Values; D013997:Time Factors