AI Article Synopsis
- Photoplethysmography (PPG) is a noninvasive optical technology used for monitoring vital signs, with most clinical applications using glabrous skin (like fingerpads) compared to nonglabrous skin (majority of body).
- A study using a smartphone-based PPG system collected data from the hands of five healthy volunteers and found that glabrous skin had a lead time of 52 ms and an amplitude increase of 31% compared to nonglabrous skin.
- These findings highlight significant differences in PPG signals based on skin type, and they can help guide future development of PPG devices, despite the small sample size of the study.
Article Abstract
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.
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| http://dx.doi.org/10.1002/jbio.202200187 | DOI Listing |
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