Results 111 to 120 of about 7,588 (215)

An image-processing toolkit for remote photoplethysmography

Multimedia Tools and Applications
Abstract Objective. Image-processing-based remote photoplethysmography algorithms are usually composed of steps where different methods are used, and often, researchers perform these steps using methods that are not necessarily the best for their application.
Javier Montalvo, Álvaro García-Martín, José M. Martínez   +2 more
openaire   +1 more source

Role of reactive oxygen species in mediating peripheral hypoxic vasodilation and sympathoexcitation at high altitude

The Journal of Physiology, EarlyView.
Abstract figure legend High‐altitude acclimatisation increases muscle sympathetic nerve activity (MSNA) via activation of the arterial chemoreflex, pulmonary arterial baroreceptors and resetting of the sympathetic vascular baroreflex. However attempting to silence these mechanisms only partially normalises MSNA, implicating other contributory ...
Liam D. Corr, Andrew J. M. Douglas, Elliott J. Jenkins, Lauren E. Maier, Jodie L. Koep, Travis D. Gibbons, Adam Field, James D. Anholm, Katharine Foster, Zoe H. Adams, Lydia L. Simpson, Jonathan P. Moore, Tinna Traustadottir, Christoph Siebenmann, Joshua C. Tremblay, Mike Stembridge   +15 more
wiley   +1 more source

Imaging Photoplethysmography: a Real-time Signal Quality Index

Computing in Cardiology Conference (CinC), 2017
Imaging photoplethysmography (iPPG) is a promising technology for contactless heart rate (HR) monitoring. However iPPG signals are easily deteriorated by subject movements and illumination changes. The purpose of this study was to develop a signal quality index (SQI) for realtime HR monitoring applications and to assess its performance on a challenging
Sibylle Fallet, Yann Schoenenberger, Lionel Martin, Fabian Braun, Virginie Moser, Jean-Marc Vesin   +5 more
openaire   +1 more source

A cascade model of dynamic cerebral autoregulation

The Journal of Physiology, EarlyView.
Abstract figure legend This study examined a two‐component cascade model linking upstream dynamic cerebral autoregulation (dCA) with downstream microvascular function (MF) to explain how blood pressure oscillations influence cortical oxygenation. Transfer function analysis in the frequency domain was applied to quantify H1(f) (MAP→CBFV; dCA), H2(f ...
Takuya Kurazumi, Kartavya Sharma, Ricardo R. J. Wennekers, Tsubasa Tomoto, Danilo Cardim, Junyeon Won, John Ashley, Jurgen A. H. R. Claassen, Rong Zhang   +8 more
wiley   +1 more source

Camera-based spatial assessment of perfusion upon stimuli

Current Directions in Biomedical Engineering, 2019
Imaging photoplethysmography allows to capture spatio-temporal patterns related to the perfusion. One such approach is based on the analysis of the time delay between pulse waves at different locations by so-called phase maps. There are different ways to
Fleischhauer Vincent, Ruprecht Nora, Zaunseder Sebastian   +2 more
doaj   +1 more source

Monitoring of Cardiorespiratory Signal: Principles of Remote Measurements and Review of Methods

IEEE Access, 2017
Physiological signs can be remotely observed from the physiological and physical effects caused by a cardiorespiratory activity. A wide range of research on remote cardiorespiratory monitoring systems has been done using different methods, including ...
Ali Al-Naji, Kim Gibson, Sang-Heon Lee, Javaan Chahl   +3 more
doaj   +1 more source

The Role of Ionic Liquids at the Biological Interfaces in Bioelectronics

Advanced Science, Volume 13, Issue 26, 8 May 2026.
Ionic liquids (ILs) are highlighted as key artificial ionic materials that bridge biological ion‐based signaling and electronic devices. By understanding their composition, structure, function relationships, and mechanisms, ILs can advance from high performance electrolyte to core materials enabling integrated, multifunctional bioelectronics for ...
Yeong‐sinn Ye, Young Jin Jo, Ji Yeon Oh, Ju Yeon Jeong, Lili Guo, Tae‐il Kim   +5 more
wiley   +1 more source

Conduit Artery Photoplethysmography and its Applications in the Assessment of Hemodynamic Condition [PDF]

, 2015
Elektroniskā versija nesatur pielikumusPromocijas darbā ir izstrādāta maģistrālo artēriju fotopletizmogrāfijas (APPG) metode hemodinamisko parametru novērtējumam.
Grabovskis, Andris
core  

Your blush gives you away: detecting hidden mental states with remote photoplethysmography and thermal imaging [PDF]

PeerJ Computer Science
Multimodal emotion recognition techniques are increasingly essential for assessing mental states. Image-based methods, however, tend to focus predominantly on overt visual cues and often overlook subtler mental state changes. Psychophysiological research
Ivan Liu, Fangyuan Liu, Qi Zhong, Fei Ma, Shiguang Ni   +4 more
doaj   +2 more sources

Fair non-contact blood pressure estimation using imaging photoplethysmography

Biomedical Optics Express
Hypertension is typically manifested as a latent symptom that requires detection through specialized equipment. This poses an inconvenience for individuals who need to undergo long-term blood pressure monitoring in their daily lives. Therefore, there is a need for a portable, non-contact method for estimating blood pressure.
Fang, Hongli, Xiong, Jiping, He, Linying
openaire   +2 more sources