Baek, Hyun Jae Chung, Gih Sung Kim, Ko Keun Park, Kwang Suk 2024-01-20T15:33:39Z 2024-01-20T15:33:39Z 2022-01-25 2012-01 1089-7771 https://pubs.kist.re.kr/handle/201004/129657 We developed nonintrusive methods for simultaneous electrocardiogram, photoplethysmogram, and ballistocardiogram measurements that do not require direct contact between instruments and bare skin. These methods were applied to the design of a diagnostic chair for unconstrained heart rate and blood pressure monitoring purposes. Our methods were operationalized through capacitively coupled electrodes installed in the chair back that include high-input impedance amplifiers, and conductive textiles installed in the seat for capacitive driven-right-leg circuit configuration that is capable of recording electrocardiogram information through clothing. Photoplethysmograms were measured through clothing using seat mounted sensors with specially designed amplifier circuits that vary in light intensity according to clothing type. Ballistocardiograms were recorded using a film type transducer material, polyvinylidenefluoride (PVDF), which was installed beneath the seat cover. By simultaneously measuring signals, beat-to-beat heart rates could be monitored even when electrocardiograms were not recorded due to movement artifacts. Beat-to-beat blood pressure was also monitored using unconstrained measurements of pulse arrival time and other physiological parameters, and our experimental results indicated that the estimated blood pressure tended to coincide with actual blood pressure measurements. This study demonstrates the feasibility of our method and device for biological signal monitoring through clothing for unconstrained long-term daily health monitoring that does not require user awareness and is not limited by physical activity. English IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC A Smart Health Monitoring Chair for Nonintrusive Measurement of Biological Signals Article 10.1109/TITB.2011.2175742 1 IEEE TRANSACTIONS ON INFORMATION TECHNOLOGY IN BIOMEDICINE, v.16, no.1, pp.150 - 158 IEEE TRANSACTIONS ON INFORMATION TECHNOLOGY IN BIOMEDICINE 16 1 150 158 N scie scopus 000300260000019 2-s2.0-84856897378 Computer Science, Information Systems Computer Science, Interdisciplinary Applications Mathematical & Computational Biology Medical Informatics Computer Science Mathematical & Computational Biology Medical Informatics Article BLOOD-PRESSURE ECG MEASUREMENT SYSTEM SENSOR PVDF TIME Ballistocardiogram (BCG) blood pressure chair ECG healthcare system heart rate (HR) nonintrusive photoplethysmogram (PPG) through clothing unconstrained