Calibration of the RT3 accelerometer for ambulation and nonambulation in children
Calibration of the RT3 accelerometer for ambulation and nonambulation in children
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DOI：
10.1249/mss.0b013e318148436c
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发表时间：
2007-11-01
期刊：
影响因子：
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通讯作者：
Yu, Clare C. W.
中科院分区：
文献类型：
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作者：
Chu, Eva Y. W.;McManus, Alison M.;Yu, Clare C. W.
CHU，E. Y. W.，A. M. McMANUS和C. C. W YU。RT 3加速度计在儿童中的安培和非安培校准。医学科学体育锻炼，第39卷，第11期，第39页。2085-2091年，2007年。目的：本研究的目的是提供RT 3加速度计阈值，以区分中国儿童的非安培和安培，以及区分低，中等和剧烈强度安培。方法：35名8至12岁的儿童完成了一项基于实验室的实验，以在一系列强度范围内校准RT 3设备。在久坐任务和锻炼期间的氧摄取与相应的RT 3输出相一致，与四个强度类别之一（久坐，< 2 MET;低，>= 2但< 3 MET;中等，>= 3但< 6;和剧烈，>= 6）。使用接收器操作曲线来区分久坐与低强度、低强度与中等强度以及中等强度与剧烈强度的阈值。这些都是在46名年龄相仿的儿童的独立样本中得到证实的。结果：RT 3运动计数以线性方式增加，从静止到剧烈运动的比例摄氧量（r（2）= 0.83）。ROC衍生的阈值显示出良好的区分卧床和非卧床任务的能力，以及区分低，中度和剧烈的Ambassador（敏感性值为87-100%，特异性值为97-100%）。独立样本中的ROC分析显示灵敏度和特异性值范围为72%至98%，表明阈值提供了四种强度类别之间的准确区分。科恩的kappa = 0.92证实，较低的阈值与独立样本接近完美的协议，而中等强度和剧烈强度的阈值显示出良好的协议与独立样本（kappa = 0.63和0.65，分别）。结论：RT 3加速度计为中国儿童提供了一个可接受的久坐和步行行为的标记。
CHU, E. Y. W., A. M. McMANUS, and C. C. W YU. Calibration of the RT3 Accelerometer for Ambulation and Nonambulation in Children. Med. Sci. Sports Exerc., Vol. 39, No. 11, pp. 2085-2091, 2007. Purpose: The purpose of this study was to provide RT3 accelerometer thresholds to distinguish nonambulation from ambulation, as well as distinguish between low, moderate, and vigorous intensity ambulation in Chinese children. Methods: Thirty-five 8- to 12-yr-olds completed a laboratory-based experiment to calibrate the RT3 device across a range of intensities. Oxygen uptake during sedentary tasks and ambulation was aligned, with corresponding RT3 output, to one of four intensity categories (sedentary, < 2 METs; low, >= 2 but < 3 METs; moderate, >= 3 but < 6; and vigorous, >= 6). Threshold values were derived using receiver operator curves to distinguish the sedentary from low intensity, low from moderate intensity and moderate from vigorous intensity. These were confirmed in an independent sample of 46 similarly aged children. Results: RT3 movement counts increased in a linear manner with scaled oxygen uptake from stationary to vigorous movement (r(2) = 0.83). The ROC-derived thresholds showed a good ability to discriminate between nonambulatory and ambulatory tasks, as well as distinguish between low, moderate, and vigorous ambulation (sensitivity values of 87-100% and specificity values of 97-100%). ROC analyses in the independent sample showed sensitivity and specificity values ranging from 72 to 98%, indicating that the thresholds provided an accurate distinction between the four intensity categories. A Cohen's kappa of kappa = 0.92 confirmed that the lower threshold had nearperfect agreement with the independent sample, whereas the moderate-intensity and vigorous-intensity thresholds showed good agreement with the independent sample (kappa = 0.63 and 0.65, respectively). Conclusion: The RT3 accelerometer provides an acceptable marker of both sedentary and ambulatory behavior in Chinese children.