Ilse De Bourdeaudhuij

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The reliability and validity of a physical activity computer questionnaire of a usual week were studied in 33 adolescents between 12 and 18 years of age. Intraclass correlation coefficients and Kappa values were calculated to verify test-retest reliability. Validity was investigated by calculating Pearson correlation coefficients between the questionnaire(More)
The authors' aim in this cross-sectional study was to characterize levels of objectively measured physical activity and sedentary time in adolescents from 9 European countries. The study comprised 2,200 European adolescents (1,184 girls) participating in the HELENA cross-sectional study (2006-2008). Physical activity was measured by accelerometry and was(More)
OBJECTIVE To investigate whether neighborhood walkability (higher residential density, land use mix, street connectivity) is positively associated with physical activity in Belgian adults and whether this association is moderated by neighborhood SES. METHODS The Belgian Environmental Physical Activity Study (BEPAS) was conducted in Ghent, Belgium. Data(More)
PURPOSE This study investigated the variance in sitting, walking, and moderate and vigorous physical activity explained by neighborhood design and recreational environmental variables above and beyond the variance accounted for by individual demographic variables. DESIGN Cross-sectional analyses of self-reported survey data. SETTING A random sample of(More)
OBJECTIVES We aimed to investigate the effects of providing play equipment and markings at the pre-school playground on physical activity engagement levels. METHODS We performed a cluster randomised control trial. In November and December 2007, a convenience sample of 40 public pre-schools in Flanders, Belgium, was randomly assigned to one of the(More)
BACKGROUND Current data on the prevalence of overweight and energy-balance behaviors among European children is necessary to inform overweight prevention interventions. METHODOLOGY/PRINCIPAL FINDINGS A school-based survey among 10-12 year old children was conducted in seven European countries using a standardized protocol. Weight, height, and waist(More)
OBJECTIVE The present study aimed to develop accelerometer cut points to classify physical activities (PA) by intensity in preschoolers and to investigate discrepancies in PA levels when applying various accelerometer cut points. METHODS To calibrate the accelerometer, 18 preschoolers (5.8 ± 0.4 years) performed eleven structured activities and one free(More)
INTRODUCTION The International Physical Activity Questionnaire (IPAQ) was developed to measure health-enhancing physical activity in adult populations. This study explores the concurrent validity of a modified version of the long IPAQ (the IPAQ-A) for the assessment of physical activity among adolescents. PARTICIPANTS AND METHODS In total, 248 healthy(More)
OBJECTIVE To examine a possible problem of overreporting and to describe the degree of error with the International Physical Activity Questionnaire (IPAQ) short telephone protocol. DESIGN Cross-sectional study, using two different physical activity (PA) self-report protocols. SETTING Telephone interviews about PA in Belgium. SUBJECTS Fifty adults who(More)
BACKGROUND Understanding environmental correlates of physical activity can inform policy changes. Surveys were conducted in 11 countries using the same self-report environmental variables and the International Physical Activity Questionnaire, allowing analyses with pooled data. METHODS The participating countries were Belgium, Brazil, Canada, Colombia,(More)