title: Television viewing and changes in body mass index and cardiorespiratory fitness over a two-year period in schoolchildren.
abstract: The aim of this study was twofold (1), to examine the prospective relationship of baseline TV viewing with BMI and CRF both at baseline and over a 2-year period, and (2) to examine the prospective relationship of baseline TV viewing and changes (Delta) on BMI and CRF over a 2-year period. Data were collected in a sample of 135 (64 girls) rural children ages 7 yr-old from elementary schools in Fundão, Portugal. Obesity status was obtained by the age-sex specific BMI cut points and CRF by a 9 min run test. TV viewing was also analyzed and children were assigned as one of two groups: the low TV watching (LTV), and high TV watching (HTV), users based upon them reported to spend less or more than 2 h/day watching TV, respectively. Logistic regression showed that those who were assigned to HTV group were 2.4 times (OR= 2.48; p = .04) more likely to be classified as unfit at time 1. Further the data showed that the LTV were more likely (OR= 0.36; p = .02) to be classified in high DeltaCRF change over time. The findings of this study suggest that there was a significant inverse association between times spent watching TV and CRF but not BMI over a 2-yr period.
authors.affiliation: Research Centre in Physical Activity Leisure and Health, Faculty of Sports, Porto University, Porto, Portugal.
authors.forename: Jorge
authors.initials: J
authors.lastname: Mota
authors.forename: José Carlos
authors.initials: JC
authors.lastname: Ribeiro
authors.forename: Joana
authors.initials: J
authors.lastname: Carvalho
authors.forename: Maria Paula
authors.initials: MP
authors.lastname: Santos
authors.forename: Júlio
authors.initials: J
authors.lastname: Martins
mesh_terms: D015992:Body Mass Index; D002320:Cardiovascular Physiological Phenomena; D002648:Child; D005080:Exercise Test; D005260:Female; D006801:Humans; D016015:Logistic Models; D008137:Longitudinal Studies; D008297:Male; D010809:Physical Fitness; D011446:Prospective Studies; D012143:Respiratory Physiological Phenomena; D057185:Sedentary Behavior; D013690:Television; D013997:Time Factors