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BACKGROUND Validation studies of height- and weight-based indexes of body fatness in children and adolescents have examined only small samples of school-age children. OBJECTIVE The objective was to validate the performance of age- and sex-specific body mass index (BMI) compared with the Rohrer index (RI) and weight-for-height in screening for both underweight and overweight in children aged 2...

BACKGROUND With the increasing focus on obesity, growth patterns in infancy and early childhood have gained much attention. Although the adiposity rebound has been in focus because of a shown association with adult obesity, not much has been published about the infant peak in body mass index (BMI). OBJECTIVE This study links age and BMI at infant peak to duration of breastfeeding and body com...

BACKGROUND Although extensive descriptive research shows that childhood obesity predisposes a person to adult obesity, little is understood about the dynamics of weight during childhood and the predictors of weight tracking. OBJECTIVE Our objective was to examine tracking patterns of body mass index (BMI) as well as their predictors between childhood and adolescence. DESIGN A cohort of 975 ...

The purpose of this study was to conduct a systematic review of prospective studies that examined the association between sugar-sweetened beverage intake before 6y of age and later weight or BMI status among older children. An electronic literature search was conducted in the MEDLINE/PubMed, SciELO, and EBSCO databases of prospective studies published from 2001 to 2011. Seven studies were analy...

BACKGROUND In low-birth-weight girls, obesity increases the risk of premature adrenarche and metabolic complications. However, the consistency of this association in normal-birth-weight children and its potential mediators remain unknown. OBJECTIVES The objectives were to assess the associations between obesity indicators and dehydroepiandrosterone sulfate (DHEAS) at 7 y of age and to evaluat...

Background: In low-birth-weight girls, obesity increases the risk of premature adrenarche and metabolic complications. However, the consistency of this association in normal-birth-weight children and its potential mediators remain unknown. Objectives: The objectives were to assess the associations between obesity indicators and dehydroepiandrosterone sulfate (DHEAS) at 7 y of age and to evaluat...

BACKGROUND Studies have reported inconsistent findings on the association between dairy product intake and weight change and obesity. Only a few prospective studies have investigated the role of dairy consumption in both weight change and risk of becoming overweight or obese and whether these associations depend on the initial body weight. OBJECTIVE We prospectively investigated how dairy pro...

(L1) ∣∣∣∣ ẏ = by, y(0) = x0, ẋ = ax, x(0) = y(t), (L2) ∣∣∣∣ ẏ = ay, y(0) = x0, ẋ = bx, x(0) = y(t). Pour le système (L1), on a clairement x(t) = exp(at)x(0) = exp(at)y(t) = exp(at) exp(bt)y(0) = exp(at) exp(bt)x. Le calcul pour (L2) se fait de la même manière et donne le même résultat. On appelle splitting de Lie les deux méthodes (L1) et (L2). Pour une équation scalaire, ces deux méthodes sont...