GALENO research group, Department of Physical Education, Faculty of Education Sciences, University of Cadiz, Puerto Real, Spain.
Biomedical Research and Innovation Institute of Cadiz (INIBICA), Spain.
J Sports Sci. 2020 Apr;38(7):780-786. doi: 10.1080/02640414.2020.1734310. Epub 2020 Mar 4.
The aims of this study were (i) to examine the sedentary time (ST) during different time periods [i.e., weekend, out-of-school weekdays hours, school hours, recess, physical education classes (PEC)] in children and adolescents; (ii) to identify 2-year longitudinal changes in the ST for these periods; and (iii) to examine if ST at baseline is associated with ST 2 years later. This was a 2-year follow-up study with 826 (51.9% boys) children and 678 (50.7% boys) adolescents. Accelerometers were used to assess ST. Students spent more than 60% of their weekend, out-of-school hours and school hours in ST. During these periods, girls and adolescents were more sedentary than boys and children, respectively (p < 0.05). Over 2-year follow-up, ST increased during the weekend, out-of-school hours, school hours and recess in all subgroups studied (p < 0.001). ST during PEC declined 2% per year in children (p < 0.001) but it increased in adolescents (p < 0.05). ST during the periods analysed at baseline was lowly associated with ST during these periods 2 years later (intraclass correlations from <0.001 to 0.364). Interventions in these settings may be adequate if the intention is to avoid ST increase in students.
(i) 检测儿童和青少年在不同时间段（即周末、校外课余时间、在校时间、课间休息和体育课）的久坐时间（ST）；(ii) 确定这些时间段 ST 的 2 年纵向变化；(iii) 探讨基线 ST 是否与 2 年后的 ST 相关。这是一项为期 2 年的随访研究，共纳入 826 名（51.9%为男生）儿童和 678 名（50.7%为男生）青少年。使用加速度计评估 ST。学生在周末、校外课余时间和在校时间的 60%以上时间都处于久坐状态。在这些时间段，女孩和青少年的 ST 均高于男孩和儿童（p<0.05）。在 2 年的随访期间，所有研究亚组的周末、校外课余时间、在校时间和课间休息的 ST 均有所增加（p<0.001）。儿童的体育课 ST 每年减少 2%（p<0.001），而青少年的体育课 ST 则增加（p<0.05）。基线期各时间段的 ST 与 2 年后这些时间段的 ST 低度相关（组内相关系数为 0.001 至 0.364）。如果目的是避免学生的 ST 增加，那么在这些环境中进行干预可能是有效的。
