AGEIS, Université Grenoble Alpes, 38000 Grenoble, France.
Department of Neuroscience, Mental Health and Sensory Organs (NESMOS), Sapienza University of Rome, 00189 Rome, Italy.
Sensors (Basel). 2024 Jan 26;24(3):825. doi: 10.3390/s24030825.
Over recent decades, wearable inertial sensors have become popular means to quantify physical activity and mobility. However, research assessing measurement accuracy and precision is required, especially before using device-based measures as outcomes in trials. The GT9X Link is a recent activity monitor available from ActiGraph, recognized as a "gold standard" and previously used as a criterion measure to assess the validity of various consumer-based activity monitors. However, the validity of the ActiGraph GT9X Link is not fully elucidated. A systematic review was undertaken to synthesize the current evidence for the criterion validity of the ActiGraph GT9X Link in measuring steps and energy expenditure. This review followed the PRISMA guidelines and eight studies were included with a combined sample size of 558 participants. We found that (1) the ActiGraph GT9X Link generally underestimates steps; (2) the validity and accuracy of the device in measuring steps seem to be influenced by gait speed, device placement, filtering process, and monitoring conditions; and (3) there is a lack of evidence regarding the accuracy of step counting in free-living conditions and regarding energy expenditure estimation. Given the limited number of included studies and their heterogeneity, the present review emphasizes the need for further validation studies of the ActiGraph GT9X Link in various populations and in both controlled and free-living settings.
近几十年来，可穿戴惯性传感器已成为量化身体活动和移动性的流行手段。然而，需要评估测量的准确性和精密度，尤其是在将基于设备的测量结果用作试验的结果之前。GT9X Link 是 ActiGraph 推出的一款新型活动监测器，被认为是一种“金标准”，之前曾被用作评估各种消费者活动监测器有效性的标准测量工具。然而，ActiGraph GT9X Link 的有效性尚未完全阐明。我们进行了系统综述，以综合当前关于 ActiGraph GT9X Link 在测量步数和能量消耗方面的标准有效性的证据。本综述遵循 PRISMA 指南，纳入了八项研究，共有 558 名参与者。我们发现：（1）ActiGraph GT9X Link 通常低估步数；（2）设备测量步数的有效性和准确性似乎受到步速、设备放置、滤波过程和监测条件的影响；（3）关于自由生活条件下的计步准确性和能量消耗估算准确性的证据不足。考虑到纳入研究的数量有限且存在异质性，本综述强调需要进一步在不同人群以及在受控和自由生活环境中对 ActiGraph GT9X Link 进行验证研究。
