GT3X ActiGraph 在儿童中的验证及与 GT1M ActiGraph 的比较。
Validation of the GT3X ActiGraph in children and comparison with the GT1M ActiGraph.
机构信息
Swiss Federal Institute of Sport, Magglingen, Switzerland.
出版信息
J Sci Med Sport. 2013 Jan;16(1):40-4. doi: 10.1016/j.jsams.2012.05.012. Epub 2012 Jun 29.
OBJECTIVES
The GT1M ActiGraph has been replaced by the triaxial GT3X which includes an inclinometer to detect postures. The purpose of this study was to investigate comparability of the GT3X to the GT1M and to develop activity intensity cut-points for the vector magnitude of the GT3X (VM(GT3X)) in children. Additionally, the study aimed to assess the validity of the GT3X inclinometer for detecting postures.
DESIGN
Forty-nine children aged 10-15 were tested during semi-structured activities in a laboratory setting (lying, sitting, standing, Nintendo Wii boxing, walking and running).
METHODS
Expired respiratory gases were measured continuously using the Cosmed K4b(2) portable metabolic system. Simultaneously, ActiGraph counts by a GT3X and a GT1M were recorded.
RESULTS
Significantly higher counts were found for GT3X vertical mean counts per second (vcps) and antero-posterior counts per second (apcps) during running, relative to the GT1M. Cut-points for the VM(GT3X), developed using Receiver Operator Characteristics (ROC) curves (development group N=32, validation group N=17), were <3 counts s⁻¹ for sedentary (cross-validation: 87% correctly classified), 3-56 counts s⁻¹ for light (cross-validation: 70% correctly classified) and >56 counts s⁻¹ for moderate to vigorous (mvpa) (cross-validation: 86% correctly classified). The inclinometer correctly classified standing 20%, lying 15%, sitting 94% and the off position 45% of the time.
CONCLUSIONS
The vcps from the two monitors differ for certain activities. Cross-validated cut-points for the classification of VM(GT3X) counts into sedentary, light and mvpa are presented. Posture classification by the GT3X should be interpreted with care, as misclassifications are common.
目的
GT1M ActiGraph 已被三轴 GT3X 取代，后者包含一个测斜仪来检测姿势。本研究的目的是研究 GT3X 与 GT1M 的可比性，并为 GT3X 的矢量幅度（VM（GT3X））制定活动强度切点。此外，该研究旨在评估 GT3X 测斜仪检测姿势的有效性。
设计
49 名 10-15 岁的儿童在实验室环境中进行半结构化活动时接受测试（躺着、坐着、站着、任天堂 Wii 拳击、行走和跑步）。
方法
使用 Cosmed K4b（2）便携式代谢系统连续测量呼出的气体。同时，记录 GT3X 和 GT1M 的 ActiGraph 计数。
结果
在跑步过程中，GT3X 垂直平均每秒计数（vcps）和前后每秒计数（apcps）明显高于 GT1M。使用接收器操作特性（ROC）曲线（开发组 N=32，验证组 N=17）制定的 VM（GT3X）切点为<3 计数 s⁻¹ 为久坐（交叉验证：87%正确分类），3-56 计数 s⁻¹ 为轻度（交叉验证：70%正确分类）和>56 计数 s⁻¹ 为中度至剧烈（mvpa）（交叉验证：86%正确分类）。测斜仪正确分类站立 20%，躺着 15%，坐着 94%，关闭位置 45%。
结论
两种监测器在某些活动中得出的 vcps 不同。提出了用于将 VM（GT3X）计数分类为久坐、轻度和 mvpa 的交叉验证切点。GT3X 的姿势分类应谨慎解释，因为错误分类很常见。
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