نبذة مختصرة : Physical activity is believed to affect health, already in childhood. Studies of physical activity in children under the age of three are, however, sparse. The overall aim of this thesis was to explore physical activity and its possible correlates in Swedish and Chinese children, aged one and two, at high and low risk for obesity. Physical activity levels and patterns among parents in Sweden and China were also examined. Study I was a calibration study where children, 15 to 36 months old, were recruited from four preschools in Stockholm, Sweden. Physical activity data, measured with accelerometry, was compared against data from Children´s Activity Rating Scale (CARS). Accelerometer count thresholds for sedentary, low- and high-intensity physical activity was derived (n=26) and cross-validated (n=12). Studies II-IV were explorative cross-sectional studies where physical activity levels, patterns and correlates were examined among one- (Study III) and two-year-old children (Studies II and IV), participating in Early STOPP (Stockholm Obesity Prevention Project) Sweden (Studies II and IV) and China (Studies III and IV). Children and their parents wore an accelerometer for seven days to assess average physical activity (counts per minute) and time spent at different intensities. Differences between weekdays and weekend days were examined as were correlations with sex, Studies II-IV were explorative cross-sectional studies where physical activity levels, patterns and correlates were examined among one- (Study III) and two-year-old children (Studies II and IV), participating in Early STOPP (Stockholm Obesity Prevention Project) Sweden (Studies II and IV) and China (Studies III and IV). Children and their parents wore an accelerometer for seven days to assess average physical activity (counts per minute) and time spent at different intensities. Differences between weekdays and weekend days were examined as were correlations with sex, body mass index (BMI), motor skills and family-related factors. The intensity ...
Relation: I. Calibration and cross-validation of a wrist-worn Actigraph GT3X+ in young preschoolers. E. Johansson, U. Ekelund, H. Nero, C. Marcus, M. Hagströmer. Pediatric Obesity, 2015, 10, 1-6. ::doi::10.1111/j.2047-6310.2013.00213.x ::pmid::24408275 ::isi::000348735000001; II. E. Johansson, M. Hagströmer, V. Svensson, A. Ek, M. Forssén, H. Nero, C. Marcus. Objectively measured physical activity in two-year-old children - levels, patterns and correlates. IJBNPA, 2015, 12, 3. ::doi::10.1186/s12966-015-0161-0 ::pmid::25616495 ::isi::000348934800001; III. Physical activity levels in Chinese one-year-old children and their parents, an Early STOPP China study. H. Mei, E. Johansson, M. Hagströmer, Y. Xiong, L. Zhang, J. Zhang, C. Marcus. [Manuscript]; IV. Physical activity in two-year-old children – An Early STOPP Sweden – China comparison study. E. Johansson, H. Mei, L. Xiu, V. Svensson, J. Zhang, C. Marcus, M. Hagströmer. [Submitted]; http://hdl.handle.net/10616/44803
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