Age Group Comparability of Raw Accelerometer Output from Wrist- and Hip-Worn Monitors
Age Group Comparability of Raw Accelerometer Output from Wrist- and Hip-Worn Monitors
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DOI：
10.1249/mss.0000000000000289
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发表时间：
2014-09-01
影响因子：
4.1
通讯作者：
Ekelund, Ulf
中科院分区：
文献类型：
--
作者：
Hildebrand, Maria;Van Hees, Vincent T.;Ekelund, Ulf
目的：研究目的是比较放置在臀部和手腕上的ActiGraph GT3X+ (AG)和GENEActiv （GA）的原始三轴加速度计输出，并建立估计能量消耗的回归方程。方法：30名儿童（7-11岁）和30名成人（18-65岁）在髋部和腕部分别佩戴一个AG和一个GA，完成8项活动（从躺到跑步）。用间接量热法测定耗氧量(V) / dotO(2)。分析包括使用方差分析来检查活动、品牌和位置对加速度值的影响，使用类内相关系数来评估两个品牌和位置之间的一致性，以及使用线性回归来建立强度阈值。结果：髋部和手腕位置的加速度值有显著差异（P < 0.001）。一般来说，手腕位置的输出比臀部位置的输出高。成人（P < 0.12）和儿童（P < 0.73）均不存在监测品牌的主效应，班级内相关系数（0.96 ~ 0.99）具有较强的一致性。然而，在儿童中发现了品牌之间的三向相互作用和系统误差。来自品牌和位置的加速度与(V) / dotO(2)有很强的相关性。总体而言，成人对品牌和位置所开发的阈值的强度分类准确率高于儿童，而久坐/轻度活动（93%-97%）和剧烈活动（68%-92%）的强度分类准确率高于中度活动（33%-59%）。结论：AG和GA的加速度计输出在连接到成人的相同身体位置时似乎具有可比性，而两种品牌和儿童的位置之间存在明显的不一致差异，因此限制了该年龄组品牌之间的可比性。
Purpose: The study aims were to compare raw triaxial accelerometer output from ActiGraph GT3X+ (AG) and GENEActiv (GA) placed on the hip and the wrist and to develop regression equations for estimating energy expenditure. Methods: Thirty children (7-11 yr) and 30 adults (18-65 yr) completed eight activities (ranging from lying to running) while wearing one AG and one GA on the hip and the wrist. Oxygen consumption ((V)over dotO(2)) was measured with indirect calorimetry. Analysis involved the use of ANOVA to examine the effect of activity, brand, and placement on the acceleration values, intraclass correlation coefficient to evaluate the agreement between the two brands and placements, and linear regression to establish intensity thresholds. Results: A significant difference in acceleration values between the hip and the wrist placement was found (P < 0.001). The output from the wrist placement was, in general, higher compared with that from the hip. There was no main effect of monitor brand in adults (P < 0.12) and children (P < 0.73), and the intraclass correlation coefficient showed a strong agreement (0.96-0.99). However, a three-way interaction and systematic error between the brands was found in children. Acceleration from both brands and placements showed a strong correlation with (V)over dotO(2). The intensity classification accuracy of the developed thresholds for both brands and placements was, in general, higher for adults compared with that for children and was greater for sedentary/light (93%-97%), and vigorous activities (68%-92%) than that for moderate activities (33%-59%). Conclusions: Accelerometer outputs from AG and GA seem comparable when attached to the same body location in adults, whereas inconsistent differences are apparent between the two brands and placements in children, hence limiting the comparability between brands in this age group.