期刊
PLOS ONE
卷 16, 期 1, 页码 -出版社
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0245501
关键词
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资金
- National Health and Medical Research Council (NHMRC) [1162166]
- National Heart Foundation of Australia [102084, 100660]
- NHMRC [1160906, 1175744, 1176858]
- NHMRC of Australia [1041352, 1109355]
- Royal Children's Hospital Foundation [2014-241]
- Murdoch Children's Research Institute (MCRI), The University of Melbourne
- Financial Markets Foundation for Children [2014-055, 2016-310]
- Victorian Government's Operational Infrastructure Support Program
The daily combination of activities has a significant impact on fitness and adiposity in children, with differing optimal time durations for each outcome. Balancing both fitness and adiposity, the overall optimal time-use composition includes approximately 10.2 hours of sleep, 9.9 hours of sedentary time, 2.4 hours of light physical activity, and 1.5 hours of moderate-to-vigorous physical activity.
Purpose Daily time spent on one activity cannot change without compensatory changes in others, which themselves may impact on health outcomes. Optimal daily activity combinations may differ across outcomes. We estimated optimal daily activity durations for the highest fitness and lowest adiposity. Methods Cross-sectional Child Health CheckPoint data (1182 11-12-year-olds; 51% boys) from the population-based Longitudinal Study of Australian Children were used. Daily activity composition (sleep, sedentary time, light physical activity [LPA], moderate-to-vigorous physical activity [MVPA]) was from 8-day, 24-hour accelerometry. We created composite outcomes for fitness (VO2max; standing long jump) and adiposity (waist-to-height ratio; body mass index; fat-to-fat-free log-ratio). Adjusted compositional models regressed activity log-ratios against each outcome. Best activity compositions (optimal time-use zones) were plotted in quaternary tetrahedrons; the overall optimal time-use composition was the center of the overlapping area. Results Time-use composition was associated with fitness and adiposity (all measures p<0.001). Optimal time use differed for fitness and adiposity. While both maximized MVPA and minimized sedentary time, optimal fitness days had higher LPA (3.4 h) and shorter sleep (8.25 h), but optimal adiposity days had lower LPA (1.0 h) and longer sleep (10.9 h). Balancing both outcomes, the overall optimal time-use composition was (mean [range]): 10.2 [9.5; 10.5] h sleep, 9.9 [8.8; 11.2] h sedentary time, 2.4 [1.8; 3.2] h LPA and 1.5 [1.5; 1.5] h MVPA. Conclusion Optimal time use for children's fitness and adiposity involves trade-offs. To best balance both outcomes, estimated activity durations for sleep and LPA align with, but for MVPA exceed, 24-h guidelines.
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