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  • 标题:Replacing school and out-of-school sedentary behaviors with physical activity and its associations with adiposity in children and adolescents: a compositional isotemporal substitution analysis
  • 本地全文:下载
  • 作者:Aleš Gába ; Jan Dygrýn ; Nikola Štefelová
  • 期刊名称:Environmental Health and Preventive Medicine
  • 印刷版ISSN:1342-078X
  • 电子版ISSN:1347-4715
  • 出版年度:2021
  • 卷号:26
  • 期号:1
  • 页码:1-9
  • DOI:10.1186/s12199-021-00932-6
  • 出版社:Springer Japan
  • 摘要:Little is known on how context-specific sedentary behaviors (SB) affect adiposity. This study aimed to investigate compositional associations between context-specific SB and adiposity and estimate the differences in adiposity associated with replacing school and out-of-school SB with physical activity (PA). This study included 336 children and adolescents. Time spent in SB and PA was estimated using multi-day 24-hour raw accelerometer data. SB and PA were specified for school and out-of-school times. Fat mass percentage (FM%) and fat mass index (FMI) were used as adiposity indicators. A compositional isotemporal substitution model was used to estimate differences in adiposity associated with one-to-one reallocations of time from context-specific SB to PA. Participants spent approximately two thirds of their school and out-of-school time being sedentary. Relative to the remaining 24-h movement behaviors, significant associations between out-of-school SB and adiposity were found in both boys (βilr1 = 0.63, 95% confidence interval [CI] = 0.03–1.22 for FM%; βilr1 = 0.76, 95% CI = 0.03–1.49 for FMI) and girls (βilr1 = 0.62, 95% CI = 0.25–0.98 for FM%; βilr1 = 0.80, 95% CI = 0.28–1.32 for FMI). Replacing 30 min/day of out-of-school SB with out-of-school light PA decreased FM% by 10.1% (95% CI = 3.3–17.9) and FMI by 14% (95% CI = 2.7–24) in girls. No significant associations were found for school SB. A reduction of out-of-school SB in favor of light PA should be advocated as an appropriate target for interventions and strategies to prevent childhood obesity.
  • 关键词:Accelerometry;Compositional data analysis;Schools;Time-use epidemiology
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