Comparison of three generations of ActiGraph activity monitors under free-living conditions: do they provide comparable assessments of overall physical activity in 9-year old children?
Comparison of three generations of ActiGraph activity monitors under free-living conditions: do they provide comparable assessments of overall physical activity in 9-year old children?
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DOI：
10.1186/2052-1847-6-26
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Anderssen SA
中科院分区：
文献类型：
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作者：
Grydeland M;Hansen BH;Ried-Larsen M;Kolle E;Anderssen SA
最近的一项综述得出结论，儿童和青少年ActiGraph加速计模型之间的数据一致性仍然不确定。本研究的目的是评价三代ActiGraph加速度计在自由生活条件下儿童中的一致性。16名9岁儿童连续三天同时佩戴ActiGraph AM 7164、GT 1 M和GT 3X+。我们比较了三代监测器在不同强度下的平均每分钟计数（mcpm）和时间，并通过类内相关系数（ICC）和Bland-Altman图评估输出的一致性。mcpm的ICC为0.985（95% CI = 0.898，0.996）。我们发现AM 7164与GT 1 M和AM 7164与GT 3X+之间的相对差异分别为11.6%和9.8%。GT 1 M和GT 3X+评估的mcpm之间的相对差异为1.7%。代际差异在强度水平上的大小和方向各不相同，最大的差异出现在最高强度。我们发现，在自由生活条件下，ActiGraph模型AM 7164产生的平均体力活动强度（mcpm）输出高于模型GT 1 M和GT 3X+。GT 1 M和GT 3X+提供了相当的输出。当调查在不同强度下花费的时间时，旧的和新的监测器之间的差异更加复杂。AM 7164评估的数据与新一代ActiGraphs评估的数据的比较应谨慎进行。
A recent review concludes that the agreement of data across ActiGraph accelerometer models for children and youth still is uncertain. The aim of this study was to evaluate the agreement of three generations of ActiGraph accelerometers in children in a free-living condition. Sixteen 9-year-olds wore the ActiGraph AM7164, GT1M and GT3X+ simultaneously for three consecutive days. We compared mean counts per minute (mcpm) and time spent at different intensities from the three generations of monitors, and the agreement of outputs were evaluated by intra-class correlation coefficients (ICC) and Bland-Altman plots. The ICC for mcpm was 0.985 (95% CI = 0.898, 0.996). We found a relative difference of 11.6% and 9.8% between the AM7164 and the GT1M and AM7164 and the GT3X+, respectively. The relative difference between mcpm assessed by the GT1M and GT3X+ was 1.7%. The inter-generation differences varied in magnitude and direction across intensity levels, with the largest difference found in the highest intensities. We found that the ActiGraph model AM7164 yields higher outputs of mean physical activity intensity (mcpm) than the models GT1M and GT3X+ in children in free-living conditions. The generations GT1M and GT3X+ provided comparable outputs. The differences between the old and the newer monitors were more complex when investigating time spent at different intensities. Comparisons of data assessed by the AM7164 with data assessed by newer generations ActiGraphs should be done with caution.