Purpose
Examine the associations and effect of physical activity and sedentary time on cardiometabolic outcomes in 10 year old children.
Project description
The ASK study is a seven month cluster-randomized controlled trial, with random allocation at the school level with a 1:1 ratio. In total, 1129 fifth-grade children from 57 elementary schools in Sogn og Fjordane County, Norway, were cluster-randomized by school either to the intervention group or to the control group. The children in the 28 intervention schools participated in a physical activity intervention between November 2014 and June 2015.
Results
Study I: Our systematic review found no evidence for a prospective association between sedentary time and cardiometabolic risk factors in youth, while the evidence for a prospective association between MVPA and clustering of cardiometabolic risk factors is consistent and inverse, supported by our meta-analysis.
Study II: Physical activity, but not sedentary time, is prospectively associated with cardiometabolic risk in healthy children.
Study III: Fitness significantly moderated the prospective association between PA and the clustered cardiometabolic risk, but not for time spent sedentary. The magnitude of association between MVPA and clustered cardiometabolic risk was stronger in children with low fitness, and no associations appeared present in their high-fit peers.
Study IV: Time spent sedentary does not predict change in BMI, WC or skinfold, but time spent in PA of at least moderate intensity predicts lower skinfolds in boys.