J Med Syst - The advantages of wearable green reflected photoplethysmography.


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This report evaluates the efficacy of reflected-type green light photoplethysmography (green light PPG). Transmitted infrared light was used for PPG and the arterial pulse was monitored transcutaneously. The reflected PPG signal contains AC components based on the heartbeat-related signal from the arterial blood flow and DC components, which include reflectance and scattering from tissue. Generally, changes in AC components are monitored, but the DC components play an important role during heat stress. In this study, we compared the signal of green light PPG to infrared PPG and ECG during heat stress. The wavelengths of the green and infrared light were 525 nm and 880 nm, respectively. Experiments were performed on young healthy subjects in cold (10?C), hot (45?C), and normal environments. The pulse rates were compared among three measurement devices and the AC and DC components of the PPG signal were evaluated during heat stress. The pulse rates obtained from green light PPG were strongly correlated with the R-R interval of an electrocardiogram in all environments, but those obtained from infrared light PPG displayed a weaker correlation with cold exposure. The AC components were of similar signal output for both wavelengths during heat stress. Also, the DC components for green light PPG were similar during heat stress, but showed less signal output for infrared light PPG during hot exposure. The main reason for the reduced DC components was speculated to be the increased blood flow at the vascular bed. Therefore, reflected green light PPG can be useful for pulse rate monitoring because it is less influenced by the tissue and vein region.

Resumo Limpo

report evalu efficaci reflectedtyp green light photoplethysmographi green light ppg transmit infrar light use ppg arteri puls monitor transcutan reflect ppg signal contain ac compon base heartbeatrel signal arteri blood flow dc compon includ reflect scatter tissu general chang ac compon monitor dc compon play import role heat stress studi compar signal green light ppg infrar ppg ecg heat stress wavelength green infrar light nm nm respect experi perform young healthi subject cold c hot c normal environ puls rate compar among three measur devic ac dc compon ppg signal evalu heat stress puls rate obtain green light ppg strong correl rr interv electrocardiogram environ obtain infrar light ppg display weaker correl cold exposur ac compon similar signal output wavelength heat stress also dc compon green light ppg similar heat stress show less signal output infrar light ppg hot exposur main reason reduc dc compon specul increas blood flow vascular bed therefor reflect green light ppg can use puls rate monitor less influenc tissu vein region

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