Bi-directional associations among sedentary time, physical activity, and sleep duration in children: A longitudinal study from the PREVIENE project
ISPAH ePoster Library. Ávila-García M. Oct 15, 2018; 225291; 229
Manuel Ávila-García
Manuel Ávila-García
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Abstract Introduction:<\b>
Research to date shows contradictory results on the relationship between physical activity (PA) and sleep parameters in children. In this study, we examined the bi-directional temporal associations among objectively measured sedentary time, PA, and sleep duration in school-aged children.Method:We conducted a longitudinal study of 311 school-aged children (54.3% boys, 8.5±0.5 years of age) from Granada (Spain) who wore a tri-axial accelerometer (Actigraph wGT3X-BT, Pensacola, FL, USA) for seven consecutive days (24 hours/day). We measured sedentary time, time spent in light, moderate and vigorous PA, and sleep duration (in minutes). We used 3-level (day, child, school) mixed models (adjusted by gender) to determine whether sedentary time and PA intensities during the day were associated with sleep duration on the same night, and whether sleep duration was associated with sedentary time and PA intensities the next day. Results:<\b>
Sedentary time and vigorous PA significantly predicted same-night sleep duration, β= –0.11, 95%-CI=(–0.15, –0.06), p<0.001; and β=0.09, 95%-CI=(0.04, 0.13), p<0.001, respectively. Sleep duration predicted next-day light PA (β=0.05; 95%-CI=(0.001, 0.10); p=0.043). Conclusion:<\b>
We found that the reduction of the sedentary time and the increase of vigorous PA would increase sleep duration on the same night, whereas longer sleep duration would increase light PA the next day. Therefore, a synergistic effect from school-based interventions that promote both PA and sleep health should be taken into account and could be beneficial for children.Funding:The PREVIENE Project was funded by the Spanish Ministry of Economy and Competitiveness (DEP2015-63988-R).
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