title: Physical activity, sedentary behavior, and adiposity in English children.
abstract: BACKGROUND
  The importance of variation in total volume of physical activity or moderate- to vigorous-intensity physical activity (MVPA) to development of body fatness in childhood is unclear, and it is unclear if physical activity has a greater influence on adiposity in boys than girls.
  
  
  OBJECTIVE
  To assess relationships between 2-year changes in objectively measured physical activity, sedentary behavior, and adiposity in English children.
  
  
  METHODS
  Prospective cohort study, set in Northeast England, of a socioeconomically representative sample of 403 children. Measures were change in accelerometer-determined physical activity and sedentary behavior from age 7 to 9 years (data collected 2006/2007 and 2008/2009; analyzed in 2010) and concurrent change in adiposity (fat mass index derived from bioelectric impedance) and change in BMI Z-score.
  
  
  RESULTS
  Decline in MVPA was associated with a greater increase in fat mass index in boys but not girls. Declining MVPA was associated with increased BMI Z-score in boys but not girls. Increased sedentary behavior was not associated with increased BMI Z-score in either gender.
  
  
  CONCLUSIONS
  Avoiding mid-late childhood reductions in MVPA may reduce excessive fat gain, although such strategies may have greater impact on boys than girls.
authors.affiliation: Human Nutrition Research Centre, Newcastle University, Newcastle upon Tyne, UK.
authors.forename: Laura
authors.initials: L
authors.lastname: Basterfield
authors.forename: Mark S
authors.initials: MS
authors.lastname: Pearce
authors.forename: Ashley J
authors.initials: AJ
authors.lastname: Adamson
authors.forename: Jessica K
authors.initials: JK
authors.lastname: Frary
authors.forename: Kathryn N
authors.initials: KN
authors.lastname: Parkinson
authors.forename: Charlotte M
authors.initials: CM
authors.lastname: Wright
authors.forename: John J
authors.initials: JJ
authors.lastname: Reilly
mesh_terms: D050154:Adiposity; D000367:Age Factors; D015992:Body Mass Index; D002648:Child; D004739:England / Q000453:epidemiology; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D009765:Obesity / Q000453:epidemiology*; D011446:Prospective Studies; D057185:Sedentary Behavior; D012737:Sex Factors; D012959:Socioeconomic Factors