Carson Valerie, Stone Michelle, Faulkner Guy
Faculty of Physical Education and Recreation, University of Alberta, Alberta, Canada.
Pediatr Exerc Sci. 2014 Feb;26(1):95-102. doi: 10.1123/pes.2013-0061. Epub 2013 Oct 2.
To make robust conclusions regarding the association between accelerometer-measured sedentary time and overweight and obesity among children, several gaps in the literature must be addressed. The purpose of this study was to examine associations between sedentary time, weekday sedentary time, weekend sedentary time, sedentary bouts, sedentary breaks, and BMI z-score among children and by low (bottom 50%) and high (top 50%) moderate- to vigorous-intensity physical activity (MVPA) participation. Results are based on 787 children aged 11 years living in Toronto, Canada. Children's physical activity and sedentary time were objectively assessed using ActiGraph accelerometers in 2010/11. Height and weight were measured and BMI z-scores were calculated based on the World Health Organization growth standards. When participants were stratified into low and high MVPA groups, sedentary bouts of 5-9 (β = 0.22 [95% CI: 0.01, 0.43]) and 10-19 (0.30 [-0.05, 0.55]) minutes for total days were associated with BMI z-score in the low MVPA group only. Similar trends were observed with the weekday but not the weekend variables. Therefore, in addition to increasing MVPA, reducing time spent in 5- to 19-min sedentary bouts may have important implications for weight status particularly for children with lower MVPA participation during the week.
为了就加速度计测量的儿童久坐时间与超重和肥胖之间的关联得出有力结论，必须解决文献中的几个空白。本研究的目的是探讨儿童的久坐时间、工作日久坐时间、周末久坐时间、久坐时段、久坐间隙与BMI z评分之间的关联，并按低（底部50%）和高（顶部50%）中度至剧烈身体活动（MVPA）参与度进行分析。结果基于居住在加拿大多伦多的787名11岁儿童。2010/11年使用ActiGraph加速度计客观评估了儿童的身体活动和久坐时间。测量了身高和体重，并根据世界卫生组织生长标准计算了BMI z评分。当参与者被分为低MVPA组和高MVPA组时，仅在低MVPA组中，全天5至9分钟（β = 0.22 [95% CI：0.01, 0.43]）和10至19分钟（0.30 [-0.05, 0.55]）的久坐时段与BMI z评分相关。在工作日变量中观察到类似趋势，但周末变量未观察到。因此，除了增加MVPA外，减少5至19分钟久坐时段的时间可能对体重状况有重要影响，特别是对于一周中MVPA参与度较低的儿童。
