title: Long-Term Correlates of Objectively Measured Physical Activity and Sedentary Time in Norwegian Men and Women.
abstract: BACKGROUND
  Sex, age, body mass index (BMI), perceived health and health behavior are correlates known to affect physical activity and sedentary time. However, studies have often been cross-sectional, and less is known about long-term correlates. Thus, the aims were to investigate 1) the associations between a set of characteristics (demographic, biological, psychological, and behavioral) and objectively measured physical activity and sedentary time at 13-year follow-up, and 2) the association between changes in these characteristics over time and physical activity and sedentary time.
  
  
  METHODS
  Baseline characteristics were collected in 40-year-olds in 1996, and follow-up data on objectively measured physical activity and sedentary time were obtained in 2009 (n = 240). Data were analyzed by multiple linear regressions.
  
  
  RESULTS
  Self-reported physical activity (P < .001) and improved perceived health (P = .046) were positively associated with moderate-to-vigorous physical activity (MVPA) whereas BMI (P = .034) and increased BMI (P = .014) were negatively associated with MVPA at follow-up. Women spent less time being sedentary than men (P = .019). Education (P < .001) was positively associated and improved perceived health (P = .010) was negatively associated with sedentary time at follow-up.
  
  
  CONCLUSIONS
  MVPA and sedentary time at follow-up were associated with behavioral, biological and demographic correlates. However, the nature of our analyses prevents us from inferring causality.
authors.affiliation: Dept of Sports Medicine, Norwegian School of Sport Sciences, Oslo, Norway.
authors.forename: Ane Kristiansen
authors.initials: AK
authors.lastname: Solbraa
authors.forename: Ulf
authors.initials: U
authors.lastname: Ekelund
authors.forename: Ingar M
authors.initials: IM
authors.lastname: Holme
authors.forename: Sidsel
authors.initials: S
authors.lastname: Graff-Iversen
authors.forename: Jostein
authors.initials: J
authors.lastname: Steene-Johannessen
authors.forename: Eivind
authors.initials: E
authors.lastname: Aadland
authors.forename: Sigmund Alfred
authors.initials: SA
authors.lastname: Anderssen
mesh_terms: D061725:Accelerometry; D000328:Adult; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D005260:Female; D005500:Follow-Up Studies; D015438:Health Behavior; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D009664:Norway; D057185:Sedentary Behavior; D057566:Self Report; D013223:Statistics as Topic