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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)
INTRODUCTION AND OBJECTIVES To investigate the association between objective measures of sedentary behavior and cardiovascular risk factors (CRFs) in adolescents. A secondary aim was to evaluate the degree of association between overall and abdominal adiposity and CRFs. METHODS This cross-sectional study involved 210 adolescents aged 13-17 years.(More)
BACKGROUND Prior studies addressing the impacts of regular physical activity or sedentary habits on the immune system have been conducted in adults and laboratory settings. Thus, it is practically unknown how a healthy active lifestyle could affect low-grade inflammation processes, infections or allergies in young persons. The AFINOS Study was designed to(More)
OBJECTIVE To examine the associations between lifestyle factors and active commuting to school in Spanish adolescents. DESIGN Cross-sectional study. Lifestyle factors (overall/extracurricular physical activity, television viewing, reading as a hobby, sleep duration, breakfast/fruit intake, smoking and alcohol intake) as well as mode and duration of(More)
BACKGROUND It is necessary to know the levels of physical activity (PA) for a better understanding of the development of chronic diseases in youth. The aim of this study was to assess levels of total PA and time spent in different PAintensities in Spanish adolescents by accelerometer. METHODS A sub-sample of 214 healthy Spanish adolescents (107 females),(More)
BACKGROUND The aim of this article is to examine the association between adolescents' physical activity (PA) levels and their relatives' (father, mother, brothers, sisters and best friend) PA engagement and encouragement. METHODS Adolescents (52.3% girls) aged 12.5-17.5 years were gathered from the HELENA study. Adolescents' PA levels were assessed by the(More)
OBJECTIVE To examine the independent and combined associations of the components of physical fitness with academic performance among youths. STUDY DESIGN This cross-sectional study included a total of 2038 youths (989 girls) aged 6-18 years. Cardiorespiratory capacity was measured using the 20-m shuttle run test. Motor ability was assessed with the 4×10-m(More)
OBJECTIVES The purpose of this study was to determine the sex-specific physical activity (PA) intensity thresholds that best discriminate between unhealthy/healthy cardiorespiratory fitness (CRF). METHODS Participants included 1,808 adolescents (964 girls), aged 12.5-17.5 years, from the HELENA study. We measured PA by accelerometer and calculated the(More)
INTRODUCTION New paradigms based on the multifactorial etiology of chronic diseases and behavioral outcomes suggest that a combination of health behaviors may have more impact on the outcome of interest than any single factor. OBJECTIVE To examine the independent and combined influence of four health behaviors on school performance in Spanish adolescents.(More)