title: Objectively measured physical activity and sedentary time during childhood, adolescence and young adulthood: a cohort study.
abstract: BACKGROUND
  To know how moderate-to-vigorous physical activity (MVPA) and sedentary time change across lifespan periods is needed for designing successful lifestyle interventions. We aimed to study changes in objectively measured (accelerometry) MVPA and sedentary time from childhood to adolescence and from adolescence to young adulthood.
  
  
  METHODS
  Estonian and Swedish participants from the European Youth Heart Study aged 9 and 15 years at baseline (N = 2312) were asked to participate in a second examination 6 (Sweden) to 9/10 (Estonia) years later. 1800 participants with valid accelerometer data were analyzed.
  
  
  RESULTS
  MVPA decreased from childhood to adolescence (-1 to -2.5 min/d per year of follow-up, P = 0.01 and <0.001, for girls and boys respectively) and also from adolescence to young adulthood (-0.8 to -2.2 min/d per year, P = 0.02 and <0.001 for girls and boys, respectively). Sedentary time increased from childhood to adolescence (+15 and +20 min/d per year, for girls and boys respectively, P<0.001), with no substantial change from adolescence to young adulthood. Changes in both MVPA and sedentary time were greater in Swedish than in Estonian participants and in boys than in girls. The magnitude of the change observed in sedentary time was 3-6 time larger than the change observed in MVPA.
  
  
  CONCLUSIONS
  The decline in MVPA (overall change = 30 min/d) and increase sedentary time (overall change = 2:45 h/d) observed from childhood to adolescence are of concern and might increase the risk of developing obesity and other chronic diseases later in life. These findings substantially contribute to understand how key health-related behaviors (physical activity and sedentary) change across important periods of life.
authors: PROmoting FITness and Health Through Physical Activity" Research Group, Department of Physical Education and Sports, School of Sport Sciences, University of Granada, Granada, Spain.
authors: Francisco B
authors: FB
authors: Ortega
authors: Kenn
authors: K
authors: Konstabel
authors: Elena
authors: E
authors: Pasquali
authors: Jonatan R
authors: JR
authors: Ruiz
authors: Anita
authors: A
authors: Hurtig-Wennlöf
authors: Jarek
authors: J
authors: Mäestu
authors: Marie
authors: M
authors: Löf
authors: Jaanus
authors: J
authors: Harro
authors: Rino
authors: R
authors: Bellocco
authors: Idoia
authors: I
authors: Labayen
authors: Toomas
authors: T
authors: Veidebaum
authors: Michael
authors: M
authors: Sjöström
mesh_terms: D061725:Accelerometry; D000293:Adolescent; D002648:Child; D015331:Cohort Studies; D004957:Estonia / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D015233:Models, Statistical; D009043:Motor Activity; D057185:Sedentary Behavior; D017678:Sex Distribution; D013548:Sweden / Q000453:epidemiology; D013997:Time Factors
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