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What is already known about this subject There is an association between adiposity levels and physical activity guidelines for adolescents., Achieving physical activity recommendations helps adolescents to prevent obesity status., What this study adds This paper presents an association between physical activity levels and obesity status., This paper supports physical activity recommendations to avoid children's obesity levels., This paper emphasizes vigorous physical activity for this matter., Background There is no information about physical activity (PA) recommendations to avoid children's obesity levels and how much of vigorous PA (VPA) is included into the '60 minutes of MVPA 5 days a week' recommendation for children. Objective The aim of this study was to examine the association between PA and adiposity in children and to examine whether the current PA guidelines are associated with a low risk of having excess of body fat in children, with special focus on sex differences, and PA intensity. Methods A sample of 439 Spanish children aged 8-10 years from the European Youth Heart Study participated in the study. The variables measured were anthropometric characteristics (height, weight, body mass index [ BMI], skin-folds and waist circumference) and PA was measured during 6 consecutive days using the GT1M accelerometer. Results Receiver operating characteristic analysis showed significant cut-off points associated with non-overweight: 45 min d−1 of VPA and 67 min d−1 of moderate-to-vigorous physical activity ( MVPA) (using BMI categories); and non-fat: 41 min d−1 of VPA and 67 min d−1 of MVPA (using percentage of body fat) and 38 min d−1 of VPA and 47 min d−1 of MVPA (using waist circumference categories) for boys. For girls, the optimal cut-offs of moderate-to-vigorous activity and MVPA associated with non-overweight were 24 and 57 min d−1, respectively ( BMI). Boys who did not meet 67 min in MVPA had an increased risk of being overweight + obese and overfat + obese (odds ratio [ OR] = 2.48, 95% confidence interval [ CI] = 1.36, 4.53, and OR = 2.56, 95% CI = 1.12, 5.82). Conclusions The findings support current PA recommendations (60 min d−1 of MVPA) to avoid excess of body fat in Spanish children. However, VPA appears to be an important component for the prevention of obesity, and our findings suggest that PA recommendations should specify the dose of VPA required for optimal health. Therefore, public health PA recommendations should incorporate specifically a greater dose of VPA into the total amount of MVPA in 8- to 10-year-old boys. [ABSTRACT FROM AUTHOR]

Prenatal methyl donor deficiency leads to homocysteine accumulation in the brain and impaired neurodevelopment in rats. We investigated the effect of moderately elevated preconception fasting total plasma homocysteine (tHcy) on child neurodevelopment in a prospective study of 67 and 76 mother-child pairs at 4 months and 6 years of age, respectively. Fasting blood samples at 2-10 weeks preconception, from the cord (nonfasting) and the mother and child 6 years after birth, were collected. Psychomotor and mental development were assessed at 4 months using the Bayley Scale of Infant Development (BSID) and cognitive development at 6 years using the Wechsler Preschool and Primary Scale of Intelligence (WPPSI). Highest tertile preconception tHcy (≥9.04 µmol/L) was categorized as moderately elevated and low-mid tertile tHcy as normal. Children, born to mothers with moderately elevated compared to normal preconception tHcy, scored lower [mean (95% CI)] in the BSID psychomotor [115 (105, 124) vs. 126 (121, 130), p = 0.03] and mental [101 (93, 109) vs. 113 (107, 119), p = 0.03] development tests. Multiple logistic regression analysis showed that moderately elevated compared to normal preconception tHcy was associated with greater probability, OR (95%CI), of scoring in the lowest tertile for BSID psychomotor development (≤120): 4.0 (1.1, 14.3) and lowest tertiles for WPPSI full (≤111), verbal (≤104) and performance (≤111), intellectual quotient: 6.0 (1.5, 23.7), 3.5 (1.1, 11.2) and 4.1 (1.1, 15.7), respectively. We conclude that moderately elevated preconception tHcy is inversely associated with psychomotor and cognitive development scores in infants and children. [ABSTRACT FROM AUTHOR]

Aim. To explore the mechanisms by which some children select disruptive behaviours to cope with stressful dental events. In particular, the relationships between dental fear, expected effectiveness of destructive coping, and intentions of displaying uncooperative behaviours were analysed. Design. Participants were 170 children who filled out a questionnaire survey. Descriptive statistics by gender and group age as well as comparisons of means were calculated. Spearman's rho correlation coefficients and binary logistic regression analysis were used to test hypotheses of the relationships among variables. Results. Both dental fear and the expected effectiveness of destructive coping strategies were significantly associated with children's uncooperative intentions at the dentist. In addition, children who strongly endorsed the effectiveness of destructive coping strategies had a higher probability of uncooperative intentions as dental fear increased. In contrast, this relationship was not statistically significant among children who did not expect negative behaviours to be effective. Conclusions. Children's expectations about the effectiveness of destructive coping behaviours can help explain variations in the use of these strategies in stressful dental situations. Dental fear as well as children's inadequate expectancies about coping alternatives should be explored and targeted to prevent and modify uncooperative behaviour intentions at the dentist. [ABSTRACT FROM AUTHOR]