Department of Rehabilitation Sciences, KU Leuven, University of Leuven, ON4 Herestraat 49 - box 1510, 3000, Louvain, Belgium.
Department of Rehabilitation Sciences and Physiotherapy, MOVANT Research Group, University of Antwerp, Antwerp, Belgium.
Support Care Cancer. 2023 Sep 28;31(10):596. doi: 10.1007/s00520-023-08061-2.
Consumer-based activity trackers are used to measure and promote PA. We studied the accuracy of a wrist- and waist-worn activity tracker in cancer survivors and compared these results to a healthy age-matched control group.
Twenty-two cancer survivors and 35 healthy subjects wore an activity tracker at the waist and at the wrist combined with a reference activity monitor at the waist (Dynaport Movemonitor). The devices were worn for 14 consecutive days. The mean daily step count from both activity trackers was compared with the reference activity monitor to investigate accuracy and agreement (paired t-test, intraclass correlation, Bland-Altman plots). To evaluate the accuracy as a coaching tool, day-by-day differences within patients were calculated. The Kendall correlation coefficient was used to test the consistency of ranking daily steps between the activity trackers and the reference activity monitor.
The wrist-worn wearable significantly overestimated the daily step count in the cancer group (mean ± SDΔ: + 1305 (2685) steps per day; p = 0.033) and in the healthy control group (mean ± SDΔ: + 1598 (2927) steps per day; p = 0.003). The waist-worn wearable underestimated the step count in both groups, although this was not statistically significant. As a coaching device, moderate (r = 0.642-0.670) and strong (r = 0.733-0.738) accuracy was found for the wrist- and waist-worn tracker, respectively, for detecting day-by-day variability in both populations.
Our results show that wrist-worn activity trackers significantly overestimate daily step count in both cancer survivors and healthy control subjects. Based on the accuracy, in particular, the waist-worn activity tracker could possibly be used as a coaching tool.
消费者使用基于活动的追踪器来测量和促进身体活动。我们研究了腕部和腰部佩戴的活动追踪器在癌症幸存者中的准确性，并将这些结果与健康的年龄匹配对照组进行了比较。
22 名癌症幸存者和 35 名健康受试者在腰部佩戴活动追踪器，并在腰部佩戴参考活动监测器（Dynaport Movemonitor）。佩戴 14 天。比较两个活动追踪器的平均每日步数与参考活动监测器，以研究准确性和一致性（配对 t 检验、组内相关、Bland-Altman 图）。为了评估作为指导工具的准确性，计算了患者内的每日差异。使用 Kendall 相关系数来测试活动追踪器和参考活动监测器之间每日步数排序的一致性。
腕部佩戴的可穿戴设备在癌症组（平均差异 ± SDΔ：每天多计 1305（2685）步；p = 0.033）和健康对照组（平均差异 ± SDΔ：每天多计 1598（2927）步；p = 0.003）中明显高估了每日步数。腰部佩戴的可穿戴设备在两个组中都低估了步数，尽管这在统计学上不显著。作为指导设备，腕部和腰部佩戴的追踪器分别在两个群体中检测到每日变化的准确性为中度（r = 0.642-0.670）和高度（r = 0.733-0.738）。
我们的结果表明，腕部佩戴的活动追踪器在癌症幸存者和健康对照组中都明显高估了每日步数。基于准确性，特别是腰部佩戴的活动追踪器可以用作指导工具。
