Mingzi Chu, Chun Hu, Lin Zhu, Jiajia Lyu, Feng Wang, Xingjuan Tao
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Data were processed with ActiLife v6.13.3 and analysed using intraclass correlation coefficients (ICC), limits of agreement, and pairwise 90% equivalence test within a ± 10% threshold.</p><p><strong>Results: </strong>The sedentary time measurements from both wrist- and waist-worn GT3X accelerometers were deemed equivalent, with high ICC values (0.98, 95% confidence intervals (CI) 0.97-0.99) and a ratio of 1.0 within the 90% CI of 0.9 to 1.0. Although agreement between accelerometers was good for classification of light-intensity activity (ICC = 0.76), the waist-worn device's estimates exceeded the equivalence criteria compared to the wrist-worn device (ratio 1.4; 90% CI 1.2-1.6). Conversely, the waist-worn device reported a significantly lower duration of moderate-to-vigorous physical activity (MVPA) than the wrist-worn device (Ln transformed ratio 0.3; 90% CI 0.1-0.4).</p><p><strong>Conclusions: </strong>The use of placement-specific cut-points did not ensure equivalence in physical activity parameter estimates between wrist- and waist-worn ActiGraph GT3X devices. 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引用次数: 0
摘要
背景：越来越多地采用加速度计来评估透析患者的久坐行为和身体活动，需要对这些监测设备进行强有力的验证。本研究旨在确定腕部和腰部佩戴的ActiGraph GT3X加速度计的可比性，使用腹膜透析患者的特定位置切割点，以完善研究和临床实践。方法：采用横断面研究。31名参与者佩戴了两个ActiGraph GT3X加速度计，分别放在右腰和非惯用手腕上，并在自然环境下进行了为期7天的监测。使用ActiLife v6.13.3软件处理数据，并使用类内相关系数（ICC）、一致性限和在±10%阈值内的两两90%等效检验进行分析。结果：腕部和腰部佩戴的GT3X加速度计测量的久坐时间被认为是相同的，具有高ICC值（0.98,95%置信区间（CI） 0.97-0.99），在0.9至1.0的90% CI范围内，比值为1.0。虽然加速度计之间的一致性对光强度活动的分类是有益的（ICC = 0.76），但与腕带设备相比，腰戴设备的估计超过了等效标准(比值为1.4；90% ci 1.2-1.6)。相反，腰戴式设备报告的中高强度体力活动（MVPA）持续时间明显低于腕戴式设备(Ln转换比0.3；90% ci 0.1-0.4)。结论：使用特定位置切割点并不能保证腕部和腰部佩戴的ActiGraph GT3X设备在体力活动参数估计上的等效。研究结果强调了对腹膜透析患者的身体活动进行可靠监测的一致性加速度计放置的必要性。临床试验号：不适用。
Physical activity and sedentary behavior in peritoneal dialysis patients: a comparative analysis of ActiGraph GT3X data collected via wrist and waist with placement-specific cut-points.
Background: The increasing adoption of accelerometers for the assessment of sedentary behaviour and physical activity among dialysis patients demands robust validation of these monitoring devices. This study aims to determine the comparability of wrist- versus waist-worn ActiGraph GT3X accelerometers, using placement-specific cut-points for peritoneal dialysis patients, to refine research and clinical practices.
Methods: This was a cross-sectional study. Thirty-one participants wore two ActiGraph GT3X accelerometers, positioned on the right waist and nondominant wrist, and monitored over a seven-day period in a naturalistic setting. Data were processed with ActiLife v6.13.3 and analysed using intraclass correlation coefficients (ICC), limits of agreement, and pairwise 90% equivalence test within a ± 10% threshold.
Results: The sedentary time measurements from both wrist- and waist-worn GT3X accelerometers were deemed equivalent, with high ICC values (0.98, 95% confidence intervals (CI) 0.97-0.99) and a ratio of 1.0 within the 90% CI of 0.9 to 1.0. Although agreement between accelerometers was good for classification of light-intensity activity (ICC = 0.76), the waist-worn device's estimates exceeded the equivalence criteria compared to the wrist-worn device (ratio 1.4; 90% CI 1.2-1.6). Conversely, the waist-worn device reported a significantly lower duration of moderate-to-vigorous physical activity (MVPA) than the wrist-worn device (Ln transformed ratio 0.3; 90% CI 0.1-0.4).
Conclusions: The use of placement-specific cut-points did not ensure equivalence in physical activity parameter estimates between wrist- and waist-worn ActiGraph GT3X devices. The findings underscore the necessity for consistent accelerometer placement for reliable monitoring of physical activity in peritoneal dialysis patients.
期刊介绍：
BMC Nephrology is an open access journal publishing original peer-reviewed research articles in all aspects of the prevention, diagnosis and management of kidney and associated disorders, as well as related molecular genetics, pathophysiology, and epidemiology.
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