Department of Movement and Sport Sciences, University of Ghent, Watersportlaan 2, Ghent, Belgium.
Int J Behav Nutr Phys Act. 2012 Nov 27;9:138. doi: 10.1186/1479-5868-9-138.
Little is known about patterns of sedentary behavior (SB) and physical activity among preschoolers. Therefore, in this observational study patterns of SB and moderate-to-vigorous physical activity (MVPA) were examined in detail throughout the week in preschool-aged boys and girls.
A sample of 703 Melbourne preschool children (387 boys; 4.6 ± 0.7 y) were included in data analysis. SB and MVPA data were collected using accelerometry over an eight-day period. Percentage of time per hour in SB and in MVPA between 08:00 h and 20:00 h was calculated. Multi-level logistic regression models were created to examine the hour-by-hour variability in SB and MVPA for boys and girls across weekdays and weekend days. Odds ratios (OR) were calculated to interpret differences in hour-by-hour SB and MVPA levels between boys and girls, and between weekdays and weekend days.
The highest SB levels co-occurred with the lowest MVPA levels from the morning till the early afternoon on weekdays, and during the morning and around midday on weekends. Besides, participation in SB was the lowest and participation in MVPA was the highest from the mid afternoon till the evening on weekdays and weekend days. The variability across the hours in SB and, especially, in MVPA was rather small throughout weekdays and weekends. These patterns were found in both boys and girls. During some hours, girls were found to be more likely than boys to demonstrate higher SB levels (OR from 1.08 to 1.16; all p < 0.05) and lower MVPA levels (OR from 0.75 to 0.88; all p < 0.05), but differences were small. During weekends, hour-by-hour SB levels were more likely to be lower (OR from 0.74 to 0.98; all p < 0.05) and hour-by-hour MVPA levels were more likely to be higher (OR from 1.15 to 1.50; all p < 0.05), than during weekdays, in boys and girls.
Entire weekdays, especially from the morning till the early afternoon, and entire weekend days are opportunities to reduce SB and to promote MVPA in preschool-aged boys and girls. Particularly weekdays hold the greatest promise for improving SB and MVPA. No particular time of the week was found where one sex should be targeted.
关于学龄前儿童久坐行为（SB）和身体活动的模式知之甚少。因此，在这项观察性研究中，详细检查了学龄前男孩和女孩整个星期内的 SB 和中等到剧烈体力活动（MVPA）模式。
对 703 名墨尔本学龄前儿童（387 名男孩；4.6±0.7 岁）的样本进行数据分析。使用加速度计在八天内收集 SB 和 MVPA 数据。计算 08:00 至 20:00 小时内每小时 SB 和 MVPA 的时间百分比。创建多水平逻辑回归模型，以检查工作日和周末男孩和女孩 SB 和 MVPA 的逐小时变异性。计算比值比（OR）以解释男孩和女孩之间以及工作日和周末之间逐小时 SB 和 MVPA 水平的差异。
在工作日的清晨至午后早些时候以及周末的清晨和中午左右，SB 水平最高，MVPA 水平最低。此外，在工作日和周末的下午到傍晚，SB 参与度最低，MVPA 参与度最高。在整个工作日和周末，SB 和 MVPA 的小时变异性都相当小。这些模式在男孩和女孩中都有发现。在某些时间，女孩比男孩更有可能表现出更高的 SB 水平（比值比从 1.08 到 1.16；所有 p<0.05）和更低的 MVPA 水平（比值比从 0.75 到 0.88；所有 p<0.05），但差异很小。在周末，男孩和女孩的每小时 SB 水平更有可能降低（比值比从 0.74 到 0.98；所有 p<0.05），每小时 MVPA 水平更有可能升高（比值比从 1.15 到 1.50；所有 p<0.05），而不是在工作日。
整个工作日，特别是从清晨到午后早些时候，以及整个周末，都是减少学龄前儿童 SB 和促进 MVPA 的机会。尤其是工作日，最有希望改善 SB 和 MVPA。没有发现一周中的特定时间是针对某个性别的。
