Ulf Ekelund

TL;DR: The modest agreement between self-reported and objectively measured PA suggests that population levels of PA derived from self-report should be interpreted cautiously and implementation of objective measures in large-scale cohort studies and surveillance systems is recommended.

TL;DR: Pooling raw accelerometer data and accompanying phenotypic data from a number of studies has the potential to create a more heterogeneous and potentially more representative sample, standardize and optimize the analytical methods used in the generation of outcome variables, and provide a means to study the causes of inter-study variability in physical activity.

TL;DR: The findings should encourage policymakers, governments, and local and national stakeholders to take action to facilitate an increase in the physical activity levels of young people across Europe.

TL;DR: ActiGraph equations do not provide accurate estimates of energy expenditure across physical activity intensities in preschoolers.

TL;DR: An overview of what was achieved in terms of furthering measurement and monitoring is given, providing overviews of the state-of-the-art in the field, and building toolboxes for further research and practice is proposed.