UNLABELLED Wearable technology is readily available for continuous assessment due to a growing number of commercial devices with increased data capture capabilities. However, many commercial devices fail to support suitable parameters (cut points) derived from the literature to help quantify physical activity (PA) due to differences in manufacturing. A simple metric to estimate cut points for new wearables is needed to aid data analysis. OBJECTIVE The purpose of this pilot study was to investigate a simple methodology to determine cut points based on ratios between sedentary behaviour (SB) and PA intensities for a new wrist worn device (PRO-Diary™) by comparing its output to a validated and well characterised 'gold standard' (ActiGraph™). STUDY DESIGN Twelve participants completed a semi-structured (four-phase) treadmill protocol encompassing SB and three PA intensity levels (light, moderate, vigorous). The outputs of the devices were compared accounting for relative intensity. RESULTS Count ratios (6.31, 7.68, 4.63, 3.96) were calculated to successfully determine cut-points for the new wrist worn wearable technology during SB (0-426) as well as light (427-803), moderate (804-2085) and vigorous (≥ 2086) activities, respectively. CONCLUSION Our findings should be utilised as a primary reference for investigations seeking to use new (wrist worn) wearable technology similar to that used here (i.e., PRO-Diary™) for the purposes of quantifying SB and PA intensities. The utility of count ratios may be useful in comparing devices or SB/PA values estimated across different studies. However, a more robust examination is required for different devices, attachment locations and on larger/diverse cohorts.

中文翻译：

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估计切割点：新可穿戴设备的简单方法

由于越来越多的商业设备具有增强的数据捕获能力，因此无标签可穿戴技术很容易用于持续评估。然而，由于制造方面的差异，许多商业设备无法支持从文献中得出的合适参数（切点）来帮助量化身体活动 (PA)。需要一个简单的指标来估计新可穿戴设备的切割点，以帮助数据分析。目标 本试点研究的目的是研究一种简单的方法，通过将其输出与经过验证且良好的新型腕戴设备 (PRO-Diary™) 的久坐行为 (SB) 和 PA 强度之间的比率确定切割点。表征“黄金标准”（ActiGraph™）。研究设计 12 名参与者完成了包含 SB 和三个 PA 强度级别（轻度、中度、剧烈）的半结构化（四阶段）跑步机方案。比较设备的输出以考虑相对强度。结果 计算计数比 (6.31, 7.68, 4.63, 3.96) 以成功确定新腕戴式可穿戴技术在 SB (0-426) 以及轻度 (427-803)、中度 (804-2085) 期间的切点和剧烈（≥2086）的活动，分别。结论 我们的研究结果应作为主要参考，用于寻求使用类似于此处使用的新（手腕佩戴）可穿戴技术（即 PRO-Diary™）来量化 SB 和 PA 强度的目的。计数比的效用可能有助于比较不同研究中估计的设备或 SB/PA 值。