A contact-force regulated photoplethysmography (PPG) platform
Open accessAbstract
A photoplethysmography (PPG) platform integrated with a miniaturized force-regulator is proposed in this study. Because a thermo-pneumatic type regulator maintains a consistent contact-force between the PPG probe and the measuring site, a consistent and stable PPG signal can be obtained. We designed and fabricated a watch-type PPG platform with an overall size of 35 mm × 19 mm. In the PPG measurement on the radial artery wrist while posture of the wrist is changed to extension, neutral, or flexion, regulation of the contact-force provides consistent PPG measurements for which the variations in the PPG amplitude (PPGA) was 7.2 %. The proposed PPG platform can be applied to biosignal measurements in various fields such as PPG-based ANS monitoring to estimate nociception, sleep apnea syndrome, and psychological stress.
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Without force regulation, the coefficient of variation between five posture stages was 50.9%; the addition of the force regulator dropped the coefficient of variation to 1.8%.
“Without force regulation, the coefficient of variation between five posture stages was calculated at 50.9%. The addition of the force regulator dropped the coefficient of variation to 1.8%.”
From Sources of inaccuracy in photoplethysmography for continuous cardiovascular monitoring (2021) · cites this paper as [212]
Cites
Photoplethysmography and its application in clinical physiological measurement
Allen, J. (2007) · Physiological Measurement · doi:10.1088/0967-3334/28/3/r01 · Cited by 3,967 · see citing works
Wearable photoplethysmographic sensors—past and present
Tamura, T., Maeda, Y., Sekine, M., & Yoshida, M. (2014) · Electronics · doi:10.3390/electronics3020282 · Cited by 912 · see citing works
Wearable Medical Systems for p-Health
Teng, X.-F., Zhang, Y.-T., Poon, C. C. Y., & Bonato, P. (2008) · IEEE Reviews in Biomedical Engineering · doi:10.1109/rbme.2008.2008248 · Cited by 310 · see citing works
Assessing pain objectively: the use of physiological markers
Cowen, R., Stasiowska, M., Laycock, H. C., & Bantel, C. (2015) · Anaesthesia · doi:10.1111/anae.13018 · Cited by 285 · see citing works
Effect of mental stress throughout the day on cardiac autonomic control
Sloan, R. P., Shapiro, P. A., Bagiella, E., Boni, S. M., Paik, M. C., Bigger, J. T., Steinman, R. C., & Gorman, J. M. (1994) · Biological Psychology · doi:10.1016/0301-0511(94)90024-8 · Cited by 240 · see citing works
Nitzan, M., Babchenko, A., Khanokh, B., & Landau, D. (1998) · Physiological Measurement · doi:10.1088/0967-3334/19/1/008 · Cited by 217 · see citing works
The effect of contacting force on photoplethysmographic signals
Teng, X. F., & Zhang, Y. T. (2004) · Physiological Measurement · doi:10.1088/0967-3334/25/5/020 · Cited by 171 · see citing works
Thomas, S. S., Nathan, V., Zong, C., Soundarapandian, K., Shi, X., & Jafari, R. (2015) · IEEE Journal of Biomedical and Health Informatics · doi:10.1109/jbhi.2015.2458779 · Cited by 140 · see citing works
Monitoring the nociception–anti-nociception balance
Gruenewald, M., & Ilies, C. (2013) · Best practice & research. Clinical anaesthesiology · doi:10.1016/j.bpa.2013.06.007 · Cited by 127 · see citing works
Photoplethysmography and nociception
Korhonen, I., & Yli‐Hankala, A. (2009) · Acta Anaesthesiologica Scandinavica · doi:10.1111/j.1399-6576.2009.02026.x · Cited by 105 · see citing works
Wearable Sweat Rate Sensors for Human Thermal Comfort Monitoring
Sim, J. K., Yoon, S., & Cho, Y.-H. (2018) · Scientific Reports · doi:10.1038/s41598-018-19239-8 · Cited by 97 · see citing works
Theoretical study on the effect of sensor contact force on pulse transit time
Teng, X.-F., & Zhang, Y.-T. (2007) · IEEE Transactions on Biomedical Engineering · doi:10.1109/tbme.2007.900815 · Cited by 94 · see citing works
Gil, E., Vergara, J. M., & Laguna, P. (2008) · Biomedical Signal Processing and Control · doi:10.1016/j.bspc.2007.12.002 · Cited by 88 · see citing works
Hamunen, K., Kontinen, V., Hakala, E., Talke, P. O., Paloheimo, M., & Kalso, E. A. (2012) · British Journal of Anaesthesia · doi:10.1093/bja/aes001 · Cited by 88 · see citing works
Braille dot display module with a PDMS membrane driven by a thermopneumatic actuator
Kwon, H., Lee, S. W., & Lee, S. S. (2008) · Sensors and Actuators A Physical · doi:10.1016/j.sna.2008.10.002 · Cited by 68 · see citing works
Photoplethysmographic signal waveform index for detection of increased arterial stiffness
Pilt, K., Meigas, K., Ferenets, R., Temitski, K., & Viigimaa, M. (2014) · Physiological Measurement · doi:10.1088/0967-3334/35/10/2027 · Cited by 62 · see citing works
Effect of probe contact pressure on the photoplethysmographic assessment of conduit artery stiffness
Grabovskis, A., Marcinkevics, Z., Rubins, U., & Kviesis-Kipge, E. (2013) · Journal of Biomedical Optics · doi:10.1117/1.jbo.18.2.027004 · Cited by 47 · see citing works
Hsiu, H., Hsu, C.-L., & Wu, T.-L. (2011) · Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine · doi:10.1177/0954411910396288 · Cited by 46 · see citing works
Reflectance Forehead Pulse Oximetry: Effects of Contact Pressure During Walking
Dresher, R. P., & Mendelson, Y. (2006) · Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) · doi:10.1109/iembs.2006.260136 · Cited by 31 · see citing works
McCombie, D. B., Reisner, A. T., & Asada, H. H. (2008) · Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) · doi:10.1109/iembs.2008.4649321 · Cited by 30 · see citing works
Rhee, S., Yang, B., & Asada, H. H. (2002) · doi:10.1109/iembs.2000.901443 · Cited by 20 · see citing works
Portable sweat rate sensors integrated with air ventilation actuators
Sim, J. K., & Cho, Y.-H. (2016) · Sensors and Actuators B Chemical · doi:10.1016/j.snb.2016.04.137 · Cited by 20 · see citing works
Developing a monitoring psychological stress index system via photoplethysmography
Abbod, M., Chiou, Y.-R., Yang, S.-H., Fan, S., & Shieh, J.-S. (2011) · Artificial Life and Robotics · doi:10.1007/s10015-011-0976-y · Cited by 12 · see citing works
A thermal peripheral blood flowmeter with contact force compensation
Sim, J. K., Youn, S., & Cho, Y.-H. (2012) · Journal of Micromechanics and Microengineering · doi:10.1088/0960-1317/22/12/125014 · Cited by 10 · see citing works
Lee, D.-H., Hong, Y.-S., & Lee, S. (2013) · Journal of the Korean Magnetics Society · doi:10.4283/jkms.2013.23.4.135 · Cited by 8 · see citing works
Sensor factors influencing photoplethysmography
Timimi, A. Y. K., & Ali, M. A. M. (2014) · IEEE Asia Pacific Conference on Circuits and Systems (APCCAS) · doi:10.1109/apccas.2014.7032808 · Cited by 8 · see citing works
Photoplethysmographic logger with contact force and hydrostatic pressure monitoring
SANTOS, P. H. C. C. D., Almeida, V., Cardoso, J. M. R., & Correia, C. M. B. A. (2013) · IEEE Portuguese Meeting on Bioengineering · doi:10.1109/enbeng.2013.6518437 · Cited by 7 · see citing works
Je, C. H., Kang, T. G., & Cho, Y.-H. (2009) · Journal of Microelectromechanical Systems · doi:10.1109/jmems.2009.2020464 · Cited by 5 · see citing works
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Cited by
Sorted by citations
Photoplethysmogram Analysis and Applications: An Integrative Review
Park, J., Seok, H. S., Kim, S.-S., & Shin, H. (2022) · Frontiers in Physiology · doi:10.3389/fphys.2021.808451 · Cited by 450 · see citing works
Sources of inaccuracy in photoplethysmography for continuous cardiovascular monitoring
Fine, J., Branan, K. L., Rodriguez, A. J., Boonya-ananta, T., Ajmal, Ramella-Roman, J. C., McShane, M. J., & Coté, G. L. (2021) · Biosensors · doi:10.3390/bios11040126 · Cited by 348 · see citing works
Current progress of photoplethysmography and SPO2 for health monitoring
TAMURA, T. (2019) · Biomedical Engineering Letters · doi:10.1007/s13534-019-00097-w · Cited by 260 · see citing works
Biomarkers and Detection Platforms for Human Health and Performance Monitoring: A Review
Sim, J. K., Brothers, M. C., Slocik, J. M., Islam, A. E., Maruyama, B., Grigsby, C. C., Naik, R. R., & Kim, S. S. (2022) · Advanced Science · doi:10.1002/advs.202104426 · Cited by 191 · see citing works
Scardulla, F., Cosoli, G., Spinsante, S., Poli, A., Iadarola, G., Pernice, R., Busacca, A., Pasta, S., Scalise, L., & D’Acquisto, L. (2023) · Measurement · doi:10.1016/j.measurement.2023.113150 · Cited by 120 · see citing works
Flexible Wearable Sensors in Medical Monitoring
Yuan, Y., Лю, Б., Li, H., Li, M., Song, Y., Wang, R., Wang, T., & Zhang, H. (2022) · Biosensors · doi:10.3390/bios12121069 · Cited by 109 · see citing works
Scardulla, F., D’Acquisto, L., Colombarini, R., Hu, S., Pasta, S., & Bellavia, D. (2020) · Sensors · doi:10.3390/s20185052 · Cited by 72 · see citing works
A Flexible Patch-Type Strain Sensor Based on Polyaniline for Continuous Monitoring of Pulse Waves
Kang, S., Rachim, V. P., Baek, J., Lee, S. Y., & Park, S. (2020) · IEEE Access · doi:10.1109/access.2020.3017218 · Cited by 49 · see citing works
Investigating the impact of contact pressure on photoplethysmograms
Sirkiä, J., Panula, T., & Kaisti, M. (2024) · Biomedical Engineering Advances · doi:10.1016/j.bea.2024.100123 · Cited by 22 · see citing works
The Impact of Contact Force on Signal Quality Indices in Photoplethysmography Measurements
Cause, J. L., Morillo, Á. S., Naranjo, J. C. G., Stiens, J. H., & da Silva, B. (2024) · Applied Sciences · doi:10.3390/app14135704 · Cited by 14 · see citing works
Cause, J. L., Morillo, Á. S., da Silva, B., Naranjo, J. C. G., & Stiens, J. H. (2023) · Sensors · doi:10.3390/s23146628 · Cited by 9 · see citing works
Intra-beat biomarker for accurate continuous non-invasive blood pressure monitoring
Abiri, A., Chou, E., Qian, C., Rinehart, J. B., & Khine, M. (2022) · Scientific Reports · doi:10.1038/s41598-022-19096-6 · Cited by 10 · see citing works
Chung, C., Mun, H., Atashzar, S. F., & Kyung, K. (2025) · Advanced Intelligent Systems · doi:10.1002/aisy.202500537 · Cited by 8 · see citing works
Wearable Sensors for Health Monitoring
Abreu, C., Bédard, C., Lourme, J.-C., & Piro, B. (2026) · Biosensors · doi:10.3390/bios16020093 · Cited by 9 · see citing works
Regalia, G., Resnati, D., & Tognetti, S. (2022) · Elsevier eBooks · doi:10.1016/b978-0-12-822548-6.00130-8 · Cited by 5 · see citing works
Contact and Non-contact Heart Beat Rate Measurement Techniques: Challenges and Issues
Khong, W. L., Mariappan, M., & Chong, C.-S. (2021) · Pertanika journal of science & technology · doi:10.47836/pjst.29.3.03 · Cited by 3 · see citing works
Liu, Z.-J., Xiang, T., Zhou, R.-S., Ji, N., & Zhang, Y. (2024) · Connected Health And Telemedicine · doi:10.20517/chatmed.2023.11 · Cited by 4 · see citing works
Wearable PPG optical sensor enabling contact pressure and skin temperature measurement
Přibil, J., Přibilová, A., & Dermek, T. (2025) · Journal of Electrical Engineering · doi:10.2478/jee-2025-0014 · Cited by 3 · see citing works
Moghaddam, M., Collins, J. P., Gardner, C. E., & Rabel, M. C. (2025) · Sensors · doi:10.3390/s26010176 · Cited by 3 · see citing works
Smart Wristband Based on a Magnetic Soft Sensor for Pulse Wave Measurement
Romano, C., Silvestri, S., Schena, E., & Massaroni, C. (2025) · IEEE Sensors Journal · doi:10.1109/jsen.2025.3594238 · Cited by 2 · see citing works
Królak, A., & Biskupiak, J. (2019) · Advances in intelligent systems and computing · doi:10.1007/978-3-030-29885-2_1 · Cited by 1 · see citing works
Research on application of dual-wavelength LED in pulse oxygen saturation
Zhao, Y., Shao, Q., & Niu, D.-J. (2021) · Modern Physics Letters B · doi:10.1142/s0217984921400194
Wearable Reflectance PPG Optical Sensor Enabling Contact Pressure and Skin Temperature Measurement
Přibil, J., Přibilová, A., & Frollo, I. (2024) · doi:10.3390/ecsa-11-20500
Přibil, J., Přibilová, A., & Dermek, T. (2025) · Bioengineering · doi:10.3390/bioengineering12121361
Mechanical Contact Conditions in Wearable Reflectance Photoplethysmography: Scoping Review
Yang, C., Xie, J., He, Z., Li, J., & Liu, C. (2026) · JMIR mhealth and uhealth · doi:10.2196/99333
Dang, N.-K., Nguyen, X.-D., Dang, C. D., & Tran-Quang, V. (2026) · International Conference on Communications and Electronics (ICCE) · doi:10.1109/icce70609.2026.11658417
Wolling, F., Filipp, A., & Michahelles, F. (2026) · ACM International Symposium on Wearable Computers (ISWC) · doi:10.1145/3830727.3834825
- Authors
- Sim, J. K., Ahn, B., & Doh, I.
- Affiliations
- Korea Research Institute of Standards and Science (KR)
- Venue
- AIP Advances
- Publisher
- AIP Publishing
- Published
- 2018-04-01
- Volume
- 8
- Issue
- 4
- ISSN
- 2158-3226 (ISSN-L)
- OpenAlex
- W2795906808
- Cited by
- 27
- References
- 28
- Citations by year
- 2026: 4 · 2025: 5 · 2024: 4 · 2023: 2 · 2022: 5 · 2021: 3 · 2020: 2 · 2019: 2
- FWCI
- 0.70
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- AIP Advances (publishedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Korea Research Institute of Standards and Science (18011083)
- National Research Foundation of Korea (17442002)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Non-Invasive Vital Sign Monitoring
- Physical Sciences › Engineering › Biomedical Engineering › Advanced Sensor and Energy Harvesting Materials
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
- Keywords
- photoplethysmography, contact force control, wrist posture, nociception, sleep apnea, psychological stress
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