McCrorie Paul, Mitchell Rich, Ellaway Anne
MRC/CSO Social & Public Health Sciences Unit, University of Glasgow, Glasgow, UK.
BMJ Open. 2018 Jan 24;8(1):e018369. doi: 10.1136/bmjopen-2017-018369.
To describe the objectively measured levels of physical activity (PA) and sedentary time in a nationally representative sample of 10-11-year-old children, and compare adherence estimates to the UK PA guidelines using two approaches to assessing prevalence.
Nationally representative longitudinal cohort study.
Scotland wide in partnership with the Growing up in Scotland (GUS) study. Data collection took place between May 2015 and May 2016.
The parents of 2402 GUS children were approached and 2162 consented to contact. Consenting children (n=1096) wore accelerometers for 8 consecutive days and 774 participants (427 girls, 357 boys) met inclusion criteria.
Total PA (counts per minute, cpm); time spent sedentary and in moderate-to-vigorous PA (MVPA); proportion of children with ≥60 min MVPA on each day of wear (daily approach); proportion of children with ≥60 min of MVPA on average across days of wear (average approach)-presented across boys and girls, index of multiple deprivation and season.
Mean PA level was 648 cpm (95% CI, 627 to 670). Children spent 7.5 hours (7.4-7.6) sedentary/day and 72.6 min (70.0-75.3) in MVPA/day. 11% (daily) and 68% (average) of children achieved the recommended levels of PA (P<0.05 for difference); a greater proportion of boys met the guidelines (12.5% vs 9.8%, NS; 75.9% vs 59.5%, P<0.001); guideline prevalence exhibited seasonal variation. No significant socioeconomic patterning existed across any outcome measure.
PA estimates are significantly influenced by the analytical method used to assess prevalence. This could have a substantial impact on the evaluation of interventions, policy objectives and public health investment. Existing guidelines, which focus on daily PA only may not further our understandings about the underlying construct itself. Gender differences exist within this age-group, suggesting greater investment, with particular consideration of seasonality, is needed for targeted intervention work in younger children.
描述在一个具有全国代表性的10至11岁儿童样本中客观测量的身体活动（PA）水平和久坐时间，并使用两种评估患病率的方法将依从性估计值与英国PA指南进行比较。
具有全国代表性的纵向队列研究。
在苏格兰全境与“苏格兰成长”（GUS）研究合作开展。数据收集于2015年5月至2016年5月进行。
联系了2402名GUS儿童的家长，2162名同意保持联系。同意参与的儿童（n = 1096）连续8天佩戴加速度计，774名参与者（427名女孩，357名男孩）符合纳入标准。
总PA（每分钟计数，cpm）；久坐时间以及中度至剧烈身体活动（MVPA）时间；佩戴期间每天有≥60分钟MVPA的儿童比例（每日法）；佩戴期间平均每天有≥60分钟MVPA的儿童比例（平均法）——按男孩和女孩、多重贫困指数和季节呈现。
平均PA水平为648 cpm（95%CI，627至670）。儿童每天久坐7.5小时（7.4 - 7.6），每天进行MVPA的时间为72.6分钟（70.0 - 75.3）。11%（每日法）和68%（平均法）的儿童达到了推荐的PA水平（差异P<0.05）；达到指南标准的男孩比例更高（12.5%对9.8%，无显著差异；75.9%对59.5%，P<0.001）；指南患病率呈现季节性变化。在任何结局指标中均未发现显著的社会经济模式。
PA估计值受用于评估患病率的分析方法的显著影响。这可能对干预措施、政策目标和公共卫生投资的评估产生重大影响。现有的仅关注每日PA的指南可能无法增进我们对潜在结构本身的理解。该年龄组内存在性别差异，这表明针对年幼儿童的有针对性干预工作需要更多投资，并特别考虑季节性因素。
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