Fatness predicts decreased physical activity and increased sedentary time, but not vice versa: support from a longitudinal study in 8-11 year old children
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Objective:To examine independent and combined cross-sectional associations between movement behaviors (physical activity [PA], sedentary time, sleep duration, screen time and sleep disturbance) and fat mass index (FMI) as well as to examine longitudinal associations between movement behaviors and FMI.Methods:Cross-sectional and longitudinal analyses were done using data from the OPUS school meal study on 785 children (52% boys, 13.4% overweight, ages 8-11). Total PA, moderate-to-vigorous physical activity (MVPA), sedentary time and sleep duration (seven days and eight nights) were assessed by accelerometer and FMI was determined by dual-energy X-ray absorptiometry (DXA) on three occasions over 200 days. Demographic characteristics, screen time and sleep disturbance (Children's Sleep Habits Questionnaire [CSHQ]) were also obtained.Results:Total PA, MVPA and sleep duration were negatively associated with FMI, while sedentary time and sleep disturbances were positively associated with FMI (P0.01). However, only total PA, MVPA and sleep duration were independently associated with FMI after adjustment for multiple covariates (P0.05), but higher FMI at baseline predicted a decrease in total PA and MVPA, and an increase in sedentary time (P0.001), even in normal-weight children (P0.03).Conclusion:Total PA, MVPA and sleep duration were independently associated with FMI, and combined associations of movement behaviors showed a synergistic effect with FMI. In the longitudinal study design, a high FMI at baseline was associated with lower PA and higher sedentary time after 200 days but not vice versa, even in normal-weight children. Our results suggest that adiposity is a better predictor of PA and sedentary behavior changes than the other way around.International Journal of Obesity accepted article preview online, 5 December 2013. doi:10.1038/ijo.2013.229.
|Journal||International Journal of Obesity|
|Number of pages||7|
|Publication status||Published - 2014|