J Clin Monit Comput - Influence of skin type and wavelength on light wave reflectance.


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RPOSE: A new application of photoplethysmography (PPG) has emerged recently to provide the possibility of heart rate monitoring without a telemetric chest strap. The aim of this study was to determine if a new device could detect pulsation over a broad range of skin types, and what light wavelength would be most suitable for detecting the signals. A light emitting diode-based PPG system was used to detect changes in pulsatile blood flow on 23 apparently healthy individuals (11 male and 12 female, 20-59 years old) of varying skin types classified according to a questionnaire in combination with digital photographs with a skin type chart. Four different light wavelengths (470, 520, 630, and 880 nm) were tested. Normalized modulation level is calculated as the AC/DC component ratio and represents the change in flow over the underlying constant state of flow or perfusion.RESULTS: In the resting condition, green light wavelength (520 nm) displayed greater modulation (p < 0.001) than all the other wavelengths analyzed regardless of skin types. Type V (dark brown) skin type was significantly lower in modulation than all other skin types. In the exercise condition, both blue (470 nm) and green (520 nm) light wavelengths displayed greater signal-to-noise ratios than red (630 nm) or infrared (880 nm) light wavelengths (p < 0.001).CONCLUSIONS: We concluded that a PPG-based device can detect pulsation across all skin types and that a greater resolution was obtained using a green light wavelength at rest and a green or blue light wavelength during exercise.

Resumo Limpo

rpose new applic photoplethysmographi ppg emerg recent provid possibl heart rate monitor without telemetr chest strap aim studi determin new devic detect pulsat broad rang skin type light wavelength suitabl detect signal light emit diodebas ppg system use detect chang pulsatil blood flow appar healthi individu male femal year old vari skin type classifi accord questionnair combin digit photograph skin type chart four differ light wavelength nm test normal modul level calcul acdc compon ratio repres chang flow under constant state flow perfusionresult rest condit green light wavelength nm display greater modul p wavelength analyz regardless skin type type v dark brown skin type signific lower modul skin type exercis condit blue nm green nm light wavelength display greater signaltonois ratio red nm infrar nm light wavelength p conclus conclud ppgbase devic can detect pulsat across skin type greater resolut obtain use green light wavelength rest green blue light wavelength exercis

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