Calibration of two objective measures of physical activity for children
Calibration of two objective measures of physical activity for children
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DOI：
10.1080/02640410802334196
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发表时间：
2008-01-01
影响因子：
3.4
通讯作者：
McMurray, Robert G.
中科院分区：
文献类型：
--
作者：
Evenson, Kelly R.;Catellier, Diane J.;McMurray, Robert G.
我们进行了一项校准研究，以确定两种常用的加速计的阈值计数，这两种加速计用于根据强度对5-8岁儿童的活动进行分类。33名儿童在15分钟的休息中同时佩戴加速计和COSMED便携式代谢系统，然后在实验室的两个不同的日子里进行最多9种不同的活动，每次7分钟。耗氧量是在呼吸的基础上测量的，加速度计的数据是在15-S时代收集的。利用受试者工作特征曲线(ROC)分析，确定了久坐、中度和剧烈活动的敏感度和特异度最大化的临界点。对于两个加速度计，对久坐行为的辨别几乎是完美的，ROC曲线下的面积等于或超过0.98。对于活动图和运动图，适度活动(分别为0.85和0.86)和剧烈活动(分别为0.83和0.86)的区分是可以接受的，但没有久坐行为那么精确。这项使用间接量热法的校准研究表明，这两个加速计可以用来区分5至8岁儿童的不同水平的体力活动强度和不活动。
A calibration study was conducted to determine the threshold counts for two commonly used accelerometers, the ActiGraph and the Actical, to classify activities by intensity in children 5 to 8 years of age. Thirty-three children wore both accelerometers and a COSMED portable metabolic system during 15min of rest and then performed up to nine different activities for 7min each, on two separate days in the laboratory. Oxygen consumption was measured on a breath-by-breath basis, and accelerometer data were collected in 15-s epochs. Using receiver operating characteristic curve (ROC) analysis, cutpoints that maximised both sensitivity and specificity were determined for sedentary, moderate and vigorous activities. For both accelerometers, discrimination of sedentary behaviour was almost perfect, with the area under the ROC curve at or exceeding 0.98. For both the ActiGraph and Actical, the discrimination of moderate (0.85 and 0.86, respectively) and vigorous activity (0.83 and 0.86, respectively) was acceptable, but not as precise as for sedentary behaviour. This calibration study, using indirect calorimetry, suggests that the two accelerometers can be used to distinguish differing levels of physical activity intensity as well as inactivity among children 5 to 8 years of age.