Accuracy of the ActiGraph GT9X Inclinometer to Assess Human Body Postures

P. Loprinzi, Brandee Smith
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引用次数: 2

Abstract

Objective: Accelerometer-determined physical activity, sedentary behavior and energy expenditure estimation may be influenced by the accuracy of accelerometer-assessed inclinometer. The purpose of this study was to examine the accuracy of the ActiGraph GT9X (most recent ActiGraph model) inclinometer across participant body habitus, and in particular, differences in central adiposity. Methods: Eighteen participants (Mage = 21.5 years) completed a series of 11 consecutive activities that varied in both movement (i.e., no movement, walking and pedaling) and anatomic position (i.e., lying, sitting and standing). During the trials, participants wore an ActiGraph GT9X accelerometer, with direct observation used to compare body position determination derived from the ActiGraph GT9X inclinometer. Results: The ActiGraph GT9X inclinometer demonstrated moderate accuracy (>68%) in body position determination for sedentary behaviors, high accuracy (>95%) in body position determination for ambulatory-based activities (e.g., walking and jogging), and had varied accuracy (100% vs. 32.1%) in identifying non-wear. Conclusion: The exclusive use of inclinometry for sedentary behavior and non-wear determination is not recommended.
ActiGraph GT9X倾斜仪评估人体姿势的准确性
目的:加速度计测量的身体活动、久坐行为和能量消耗估计可能受到加速度计测量的倾角仪精度的影响。本研究的目的是检验ActiGraph GT9X(最新的ActiGraph模型)倾斜仪在参与者身体习惯中的准确性,特别是中心性肥胖的差异。方法:18名参与者(年龄21.5岁)完成了一系列连续的11项活动,这些活动在运动(即不运动,步行和蹬车)和解剖位置(即躺,坐和站)上都有变化。在试验期间,参与者佩戴了ActiGraph GT9X加速度计,直接观察用于比较由ActiGraph GT9X倾角计得出的身体位置测定。结果:ActiGraph GT9X倾角仪在确定久坐行为的体位方面显示出中等准确度(>68%),在确定基于走动的活动(如散步和慢跑)的体位方面显示出较高的准确度(>95%),并且在确定非磨损方面具有不同的准确度(100%对32.1%)。结论:不建议单独使用倾斜度测定法测定久坐行为和非磨损。
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