J Phys Act Health. 2019 Dec 1;16(12):1123-1128. doi: 10.1123/jpah.2019-0128. Epub 2019 Oct 7.
The objective was to examine changes of children's time spent in sedentary, light physical activity, moderate to vigorous physical activity (MVPA), and estimated energy expenditure (EE) rates during weekdays and weekends across 3 years.
An initial sample of 261 children's (mean age = 7.81 y) 5-day physical activity and EE were assessed annually via accelerometry across 3 years using repeated-measures multivariate analysis of variance. The outcome variables were time spent in sedentary, light physical activity, MVPA, and kilocalories per day for weekdays and weekends.
A significant decrease in MVPA and EE occurred during weekdays across the 3 years (P = .01). Only the second-year data demonstrated an increase (+2.49 min) in weekend MVPA (P = .04). Children's sedentary time during weekdays increased significantly in years 1 and 2 (P = .01), yet significantly decreased in the third year (-44.31 min). Children's sedentary time during weekends significantly decreased in the first year (-27.31 min), but increased in the following 2 years (P = .01). Children's light physical activity demonstrated a statistically significant increase in year 2 (+3.75 min) during weekdays (P = .05).
Children's MVPA and EE generally declined during weekdays but were maintained during weekends across a 3-year time span. Children may benefit most from weekday intervention strategies.
本研究旨在考察儿童在工作日和周末期间，久坐、轻度体力活动、中等到剧烈体力活动（MVPA）和估计能量消耗（EE）率随时间的变化。
初始样本为 261 名儿童（平均年龄=7.81 岁），在 3 年内每年通过加速度计进行 5 天的体力活动和 EE 评估，使用重复测量多元方差分析进行分析。结果变量为工作日和周末的久坐时间、轻度体力活动、MVPA 和每天消耗的千卡数。
在 3 年内，工作日的 MVPA 和 EE 呈显著下降趋势（P=0.01）。只有第二年的数据显示周末 MVPA 增加（+2.49 分钟）（P=0.04）。儿童在工作日的久坐时间在第 1 年和第 2 年显著增加（P=0.01），但在第 3 年显著减少（-44.31 分钟）。儿童在周末的久坐时间在第 1 年显著减少（-27.31 分钟），但在随后的 2 年增加（P=0.01）。儿童的轻度体力活动在第 2 年（+3.75 分钟）工作日呈现统计学显著增加（P=0.05）。
儿童在工作日的 MVPA 和 EE 普遍下降，但在 3 年的时间跨度内，周末保持不变。儿童可能最受益于工作日的干预策略。
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