title: Association between electronic equipment in the bedroom and sedentary lifestyle, physical activity, and body mass index of children.
abstract: OBJECTIVE
  To describe the association between electronic devices in the bedroom with sedentary time and physical activity, both assessed by accelerometry, in addition to body mass index in children from São Caetano do Sul.
  
  
  METHODS
  The sample consisted of 441 children. The presence of electronic equipment (television, personal computer, and videogames) in the bedroom was assessed by a questionnaire. For seven consecutive days, children used an accelerometer to objectively monitor the sedentary time and moderate-to-vigorous physical activity. Body mass index was categorized as suggested by the World Health Organization.
  
  
  RESULTS
  Overall, 73.9%, 54.2% and 42.8% of children had TV, computer, and videogames in the bedroom, respectively, and spent an average of 500.7 and 59.1 min/day of sedentary time and moderate-to-vigorous physical activity. Of the children, 45.3% were overweight/obese. Girls with a computer in the bedroom (45 min/day) performed less moderate-to-vigorous physical activity than those without it (51.4 min/day). Similar results were observed for body mass index in boys. Moderate-to-vigorous physical activity was higher and body mass index was lower in children that had no electronic equipment in the bedroom. Presence of a computer (β=-4.798) and the combination TV+computer (β=-3.233) were negatively associated with moderate-to-vigorous physical activity. Videogames and the combinations with two or three electronic devices were positively associated with body mass index. Sedentary time was not associated with electronic equipment.
  
  
  CONCLUSIONS
  Electronic equipment in the children's bedroom can negatively affect moderate-to-vigorous physical activity and body mass index regardless of gender, school, and annual family income, which can contribute to physical inactivity and childhood obesity.
authors.affiliation: Centro de Estudos do Laboratório de Aptidão Física de São Caetano do Sul (CELAFISCS), São Caetano do Sul, SP, Brazil; Centro de Atendimento e Apoio ao Adolescente (CAAA), Department of Pediatrics, Escola Paulista de Medicina (EPM), Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil. Electronic address: gersonferrari08@yahoo.com.br.
authors.forename: Gerson Luis de Moraes
authors.initials: GL
authors.lastname: Ferrari
authors.affiliation: Centro de Estudos do Laboratório de Aptidão Física de São Caetano do Sul (CELAFISCS), São Caetano do Sul, SP, Brazil.
authors.forename: Timóteo Leandro
authors.initials: TL
authors.lastname: Araújo
authors.affiliation: Centro de Estudos do Laboratório de Aptidão Física de São Caetano do Sul (CELAFISCS), São Caetano do Sul, SP, Brazil.
authors.forename: Luis Carlos
authors.initials: LC
authors.lastname: Oliveira
authors.affiliation: Centro de Estudos do Laboratório de Aptidão Física de São Caetano do Sul (CELAFISCS), São Caetano do Sul, SP, Brazil.
authors.forename: Victor
authors.initials: V
authors.lastname: Matsudo
authors.affiliation: Centro de Atendimento e Apoio ao Adolescente (CAAA), Department of Pediatrics, Escola Paulista de Medicina (EPM), Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Mauro
authors.initials: M
authors.lastname: Fisberg
mesh_terms: D061725:Accelerometry; D015992:Body Mass Index; D001938:Brazil / Q000453:epidemiology; D002648:Child; D002652:Child Behavior; D003201:Computers / Q000706:statistics & numerical data*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D009043:Motor Activity; D063766:Pediatric Obesity / Q000453:epidemiology / Q000209:etiology*; D057185:Sedentary Behavior; D012959:Socioeconomic Factors; D013690:Television / Q000706:statistics & numerical data*; D013997:Time Factors; D018910:Video Games / Q000706:statistics & numerical data*
keywords: Atividade física; Children; Crianças; Obesidade; Obesity; Physical activity; Sedentarismo; Sedentary lifestyle