加速度计测定的学龄儿童身体活动和久坐行为的可靠性：一项12国研究。
Reliability of accelerometer-determined physical activity and sedentary behavior in school-aged children: a 12-country study.
作者信息
Barreira T V, Schuna J M, Tudor-Locke C, Chaput J-P, Church T S, Fogelholm M, Hu G, Kuriyan R, Kurpad A, Lambert E V, Maher C, Maia J, Matsudo V, Olds T, Onywera V, Sarmiento O L, Standage M, Tremblay M S, Zhao P, Katzmarzyk P T
机构信息
Department of Exercise Science, School of Education, University of Syracuse, Syracuse, NY, USA; Pennington Biomedical Research Center, Baton Rouge, LA, USA.
Pennington Biomedical Research Center, Baton Rouge, LA, USA; School of Biological and Population Health Sciences Oregon State University, Corvallis, OR, USA.
出版信息
Int J Obes Suppl. 2015 Dec;5(Suppl 2):S29-35. doi: 10.1038/ijosup.2015.16. Epub 2015 Dec 8.
OBJECTIVES
Focused on the accelerometer-determined physical activity and sedentary time metrics in 9-11-year-old children, we sought to determine the following: (i) number of days that are necessary to achieve reliable estimates (G⩾0.8); (ii) proportion of variance attributed to different facets (participants and days) of reliability estimates; and (iii) actual reliability of data as collected in The International Study of Childhood Obesity, Lifestyle and Environment (ISCOLE).
METHODS
The analytical sample consisted of 6025 children (55% girls) from sites in 12 countries. Physical activity and sedentary time metrics measures were assessed for up to 7 consecutive days for 24 h per day with a waist-worn ActiGraph GT3X+. Generalizability theory using R software was used to investigate the objectives i and ii. Intra-class correlation coefficients (ICC) were computed using SAS PROC GLM to inform objective iii.
RESULTS
The estimated minimum number of days required to achieve a reliability estimate of G⩾0.8 ranged from 5 to 9 for boys and 3 to 11 for girls for light physical activity (LPA); 5 to 9 and 3 to 10, for moderate-to-vigorous physical activity (MVPA); 5 to 10 and 4 to 10 for total activity counts; and 7 to 11 and 6 to 11 for sedentary time, respectively. For all variables investigated, the 'participant' facet accounted for 30-50% of the variability, whereas the 'days' facet accounted for ⩽5%, and the interaction (P × D) accounted for 50-70% of the variability. The actual reliability for boys in ISCOLE ranged from ICCs of 0.78 to 0.86, 0.73 to 0.85 and 0.72 to 0.86 for LPA, MVPA and total activity counts, respectively, and 0.67 to 0.79 for sedentary time. The corresponding values for girls were 0.80-0.88, 0.70-0.89, 0.74-0.86 and 0.64-0.80.
CONCLUSIONS
It was rare that only 4 days from all participants would be enough to achieve desirable reliability estimates. However, asking participants to wear the device for 7 days and requiring ⩾4 days of data to include the participant in the analysis might be an appropriate approach to achieve reliable estimates for most accelerometer-derived metrics.
目的
针对9至11岁儿童通过加速度计测定的身体活动和久坐时间指标，我们试图确定以下内容：（i）获得可靠估计值（G⩾0.8）所需的天数；（ii）可靠性估计值不同方面（参与者和天数）所导致的方差比例；以及（iii）在“儿童肥胖、生活方式和环境国际研究”（ISCOLE）中收集的数据的实际可靠性。
方法
分析样本包括来自12个国家研究点的6025名儿童（55%为女孩）。使用佩戴在腰部的ActiGraph GT3X+，每天24小时连续评估身体活动和久坐时间指标，最长评估7天。使用R软件的概化理论来研究目标（i）和（ii）。使用SAS PROC GLM计算组内相关系数（ICC）以了解目标（iii）。
结果
对于轻度身体活动（LPA），男孩达到G⩾0.8可靠性估计所需的估计最少天数为5至9天，女孩为3至11天；对于中度至剧烈身体活动（MVPA），分别为5至9天和3至10天；对于总活动计数，分别为5至10天和4至10天；对于久坐时间，分别为7至11天和6至11天。对于所有研究变量，“参与者”方面占变异性的30 - 50%，而“天数”方面占⩽5%，交互作用（P×D）占变异性的50 - 70%。在ISCOLE中，男孩LPA、MVPA和总活动计数的实际可靠性的ICC范围分别为0.78至0.86、0.73至0.85和0.72至0.86，久坐时间为0.67至0.79。女孩的相应值分别为0.80 - 0.88、0.70 - 0.89、0.74 - 0.86和0.64 - 0.80。
结论
所有参与者仅用4天就足以获得理想可靠性估计的情况很少见。然而，要求参与者佩戴设备7天，并要求至少4天的数据以将参与者纳入分析，可能是一种为大多数加速度计得出的指标获得可靠估计的合适方法。
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