PDF(Pubmed)
Abstract：
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.
摘要：
近几十年来,可穿戴惯性传感器已经成为量化身体活动和移动性的流行手段。然而,需要评估测量精度和精度的研究，尤其是在使用基于设备的措施作为试验结果之前.GT9X链接是ActiGraph提供的最新活动监视器，被公认为“黄金标准”，以前用作评估各种基于消费者的活动监控器有效性的标准措施。然而,ActiGraphGT9X链接的有效性尚未完全阐明。进行了系统的审查，以综合当前证据，证明ActiGraphGT9XLink在测量步骤和能量消耗方面的标准有效性。这篇综述遵循了PRISMA指南，纳入了8项研究，合并样本量为558名参与者。我们发现（1）ActiGraphGT9XLink通常会低估步数；（2）测量步数的设备的有效性和准确性似乎受到步态速度的影响，设备放置,过滤过程，和监测条件；(3)缺乏关于自由生活条件下计步的准确性和关于能源支出估计的证据。鉴于纳入研究的数量有限及其异质性，本综述强调有必要在不同人群中以及在受控和自由生活环境中对ActiGraphGT9XLink进行进一步的验证研究.
