Validation of Uniaxial and Triaxial Accelerometers for the Assessment of Physical Activity in Preschool Children
Validation of Uniaxial and Triaxial Accelerometers for the Assessment of Physical Activity in Preschool Children
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DOI：
10.1123/jpah.9.7.944
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发表时间：
2012-09-01
影响因子：
3.1
通讯作者：
Butte, Nancy F.
中科院分区：
文献类型：
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作者：
Adolph, Anne L.;Puyau, Maurice R.;Butte, Nancy F.
目的：鉴于学龄前儿童独特的身体活动（PA）模式，用于定量评估身体活动的可穿戴电子设备需要在这一人群中进行验证。研究目的是验证学龄前儿童的单轴和三轴加速度计。研究方法：在64名学龄前儿童中进行了超过3小时的室内热量测定，在玩耍、缓慢、中度和快速移位期间佩戴Actial、Actiheart和RT 3加速度计。基于活动能量消耗（AEE）和加速度计计数，通过分段线性回归和判别边界分析确定PA水平的最佳阈值。结果如下：使用学龄前儿童久坐/轻度、轻度/中度和中度/剧烈水平的既定HR截止值来定义AEE（0.015、0.054、0.076 kcal.kg（-1）.min（-1））和PA比率（PAR; 1.6、2.9、3.6）阈值以及加速度计阈值。久坐的真实阳性预测率分别为77%、75%和76%;轻度为63%、61%和65%;中度为34%、52%和49%;剧烈水平为46%、46%和49%。由于阳性预测率较低，我们将中度和重度PA结合起来。分类准确性在总体上得到了提高，并且对于Actical、Actiheart和RT 3的合并中度至重度PA水平（69%、82%、79%）分别得到了提高。结论：单轴和三轴加速度计是可接受的设备，具有相似的分类精度，用于学龄前儿童久坐、轻度和中度至剧烈的PA水平。
Purpose: Given the unique physical activity (PA) patterns of preschoolers, wearable electronic devices for quantitative assessment of physical activity require validation in this population. Study objective was to validate uniaxial and triaxial accelerometers in preschoolers. Methods: Room calorimetry was performed over 3 hours in 64 preschoolers, wearing Actical, Actiheart, and RT3 accelerometers during play, slow, moderate, and fast translocation. Based on activity energy expenditure (AEE) and accelerometer counts, optimal thresholds for PA levels were determined by piecewise linear regression and discrimination boundary analysis. Results: Established HR cutoffs in preschoolers for sedentary/light, light/moderate and moderate/vigorous levels were used to define AEE (0.015, 0.054, 0.076 kcal.kg(-1).min(-1)) and PA ratio (PAR; 1.6, 2.9, 3.6) thresholds, and accelerometer thresholds. True positive predictive rates were 77%, 75%, and 76% for sedentary; 63%, 61%, and 65% for light; 34%, 52%, and 49% for moderate; 46%, 46%, and 49% for vigorous levels. Due to low positive predictive rates, we combined moderate and vigorous PA. Classification accuracy was improved overall and for the combined moderate-to-vigorous PA level (69%, 82%, 79%) for Actical, Actiheart, and RT3, respectively. Conclusion: Uniaxial and triaxial accelerometers are acceptable devices with similar classification accuracy for sedentary, light, and moderate-to-vigorous levels of PA in preschoolers.