Department of Biomedical Engineering, Toronto Metropolitan University, Toronto, Canada.
Department of Physics, Toronto Metropolitan University, Toronto, Canada.
J Biophotonics. 2023 Jan;16(1):e202200187. doi: 10.1002/jbio.202200187. Epub 2022 Sep 13.
Photoplethysmography (PPG) is a noninvasive optical technology, with applications including vital sign extraction and patient monitoring. The PPG acquisition skin type may be of importance. Skin is either nonglabrous (90%) or glabrous (10%). Clinical PPG collection is typically from glabrous (fingerpad), while proliferating wearables collecting PPG, which may perform critical functions like arrythmia detection, often acquire from atypical sites. Glabrous skin has significant differences from nonglabrous, including microcirculation, yet comparisons between their PPG signals have not been well reported. Using a smartphone-based remote/contactless PPG, a pilot dataset was collected from the hands (palmar/dorsal) of five healthy volunteers. The data shows statistically significant lead time (52 ± 36 ms) of glabrous over nonglabrous. Further, a trend of glabrous amplitude increase over nonglabrous (31%) was found. Although our study has a small number of participants, these results further the characterization of PPG skin differences, and can be used to inform development of PPG-based devices.
光电容积脉搏波描记法（PPG）是一种非侵入式光学技术，应用包括生命体征提取和患者监测。PPG 的采集皮肤类型可能很重要。皮肤要么是无毛发的（90%），要么是有毛发的（10%）。临床 PPG 采集通常来自有毛发的（指腹），而正在发展的可穿戴设备采集 PPG，可能执行关键功能，如心律失常检测，通常从非典型部位采集。有毛发的皮肤与无毛发的皮肤有很大的不同，包括微循环，但它们的 PPG 信号之间的比较尚未得到很好的报道。使用基于智能手机的远程/非接触式 PPG，从五名健康志愿者的手部（掌侧/背侧）采集了一个试点数据集。数据显示，有毛发的皮肤相对于无毛发的皮肤有显著的领先时间（52±36 毫秒）。此外，还发现有毛发的皮肤的振幅相对于无毛发的皮肤增加（31%）的趋势。尽管我们的研究参与者人数较少，但这些结果进一步说明了 PPG 皮肤差异的特征，并可用于为基于 PPG 的设备的开发提供信息。
