title: Overweight and obesity related to activities in Portuguese children, 7-9 years.
abstract: BACKGROUND
  The purpose of the study was to explore the association among the following variables: physical activity, TV, videogames, and obesity. The study included a Portuguese random nationally representative sample of 3365 children (1610 girls and 1755 boys) 7-9 year olds.
  
  
  METHODS
  A general questionnaire was completed by the parents of participating children to provide information about the hours spent per week watching television, computer use and electronic games, and the participation in physical education. Overweight and obesity were calculated by using the body mass index (BMI) assessment and the cut-off points for overweight (25 kg/m(2)) and obesity (30 kg/m(2)).
  
  
  RESULTS
  The data from the association between BMI and the independent variables (analysis of variance) were only significant for time playing electronic games for boys and girls (P < 0.001; P < 0.029). The association between hours of watching TV and BMI was significant only for boys (P < 0.016). The results from the logistic regression were only significant for electronic games both for boys and girls (P < 0.000; P < 0.000).
  
  
  CONCLUSIONS
  The results of this study suggest that the time spent playing electronic games is associated with obesity. Reducing childhood obesity calls for the reduction in sedentary behaviours, and the promotion of a more active lifestyle.
authors.affiliation: Department of Sports, University of Trás-os-Montes Alto Douro Vila Real, Portugal.
authors.forename: Maria Mourão
authors.initials: MM
authors.lastname: Carvalhal
authors.forename: Maria Cristina
authors.initials: MC
authors.lastname: Padez
authors.forename: Pedro Alexandre
authors.initials: PA
authors.lastname: Moreira
authors.forename: Vítor Marques
authors.initials: VM
authors.lastname: Rosado
mesh_terms: D000704:Analysis of Variance; D015992:Body Mass Index; D002648:Child; D003201:Computers / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D008297:Male; D009043:Motor Activity; D009765:Obesity / Q000453:epidemiology*; D016017:Odds Ratio; D050177:Overweight / Q000502:physiology; D010806:Physical Education and Training / Q000706:statistics & numerical data; D011174:Portugal / Q000453:epidemiology; D017678:Sex Distribution; D011795:Surveys and Questionnaires; D013690:Television / Q000706:statistics & numerical data; D013997:Time Factors; D018910:Video Games / Q000009:adverse effects / Q000706:statistics & numerical data