Abstract 12949: Moderate and Vigorous Physical Activity Related to Clustering of Risk Factors for CVD in Children
Introduction: Lack of physical activity is generally thought to be associated with risk factors for CVD in children. Previous studies have, however, produced conflicting results.
Hypothesis: We assessed the hypothesis if objectively measured physical activity is related to clustering of risk factors for CVD in children aged 8 to 11 years.
Methods: Cross-sectional study of 156 (81 boys and 75 girls) children aged 8–11 years, recruited from an urban population-based cohort. Physical activity was measured by accelerometers worn for four days and minutes of moderate and vigorous physical activity (MVPA) per day was calculated. Total body fat mass (TBF) and abdominal fat mass (AFM) were measured by Dual-energy x-ray absorptiometry. Body fatness was expressed as TBFs percentage of body mass (BF%;) and body fat distribution as AFM/TBF. Maximal oxygen uptake (VO2PEAK) was measured during a maximal exercise test. Blood was sampled and blood pressure (BP), and resting heart rate (HR) were measured. Z-scores (Value for the individual-mean value for group)/SD) were calculated. Sum of z-scores for triglycerides (TG) and lipoprotein concentrations, BF%;, AFM, AFM/TBF, systolic and diastolic BP, HR, and -VO2PEAK, calculated in boys and girls, separately, were used as an indices of clustered risk.
Results: Boys performed significantly more minutes of MVPA per day compared to girls (46±21 vs. 35±13, P<0.001). Person correlation indicated a significant association between MVPA versus indices of clustered risk in girls (−0.40, P<0.05), but not in boys (−0.16, NS). One-way ANOVA analysis indicated significant association between girls in the different tertiles of MVPA and in sum of z-scores (P=0.001), whereas no similar association was found in boys (P=0.56, NS).
Conclusion: In this population-based cohort of children aged 8 to 11 years minutes of moderate and vigorous physical activity per day predicted clustering of risk factors for CVD in girls. No such pattern could be observed in boys, which could be attributed to a higher physical activity level.
- © 2010 by American Heart Association, Inc.