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We developed a chair-attached, nonintrusive photoplethysmogram (PPG) measuring system for everyday life, unconstrained monitoring using nonskin-contacting sensor-amplifier circuits capable of emitting suitable light intensity adaptable to clothing characteristics. Comparison between proposed and conventional systems showed reasonable correlation and root-mean-squared error levels, indicating its feasibility...
Diastolic blood pressure estimation using only pulse arrival time was not sufficient. To overcome it, arterial stiffness was considered. Several parameters related to information, time, slop information in photoplethysmography signal were chosen and investigated. Five subjects executed Valsalva Maneuver which caused the blood pressure variation. Time from maximum point of first derivative wave to...
Coronary artery disease (CAD) is one of the major causes of death. Therefore recurrent monitoring of arterial condition is important. The photoplethysmography (PPG) is simple and cost effective technique to measure blood volume change. As an application of PPG technique, the second derivative of photoplethysmography(SDPTG) was introduced for monitoring arterial condition. SDPTG consists of an a, b,...
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