Results 91 to 100 of about 1,748,185 (170)

Non-Contact Neonatal Heart Rate Monitoring Using Blue Filter Technique with Photoplethysmography Imaging under UV Illumination

Journal of Biomedical Photonics & Engineering
Non-contact heart rate (HR) monitoring is essential for neonates, as traditional adhesive sensors can damage their delicate skin. The rise in contagious viral infections further emphasizes the need for contactless neonatal healthcare monitoring systems ...
Huda Ali Hashim
doaj   +1 more source

Identification of the individual cardiac contraction threshold during high‐frame‐rate stress echocardiography

Experimental Physiology, EarlyView.
Abstract The clinical assessment of cardiovascular function during exercise using stress echocardiography is essential for accurate cardiac diagnosis. However, normal limitations of cardiac deformation responses to increasing physical exertion remain poorly understood.
Fabian Spahiu, Max Hagemann, Michelle Ottlik, Moritz Lampkemeyer, Eric J. Stöhr   +4 more
wiley   +1 more source

Spatial averaging method based on adaptive weight for imaging photoplethysmography. [PDF]

J Biomed Opt, 2023
Ryu J, Ryu H, Liang S, Hong S, Lian Y, Zheng Z.   +5 more
europepmc   +1 more source

Is resting muscle sympathetic nerve activity related to peripheral or cerebrovascular haemodynamics at high altitude? A retrospective analysis

Experimental Physiology, EarlyView.
Abstract High‐altitude hypoxia elicits several profound physiological responses, including substantial increases in muscle sympathetic nerve activity (MSNA); however, the association of this heightened MSNA with cardiovascular and cerebrovascular haemodynamics remains unclear in lowlanders and indigenous highlander populations.
Ty J. A. MacDonald, Jenna C. McCrone, Christabel Osei‐Boateng, Connor D. Wideman, Samantha L. Tsioros, Joshua C. Tremblay, Alexander Patrician, Connor A. Howe, Geoff B. Coombs, Benjamin S. Stacey, Lydia L. Simpson, Mike Stembridge, Craig D. Steinback, Jonathan P. Moore, Travis D. Gibbons, Ryan L. Hoiland, Francisco Villafuerte, Gilbert Moralez, Philip N. Ainslie, Michael M. Tymko   +19 more
wiley   +1 more source

Integrated system for ultrasonic, elasticity and photoacoustic imaging [PDF]

, 2008
textBy integrating three complementary imaging techniques - ultrasound, elasticity and photoacoustic imaging, a hybrid imaging system utilizing an array transducer is proposed for various biomedical imaging applications including cancer detection ...
Park, Suhyun, 1977-
core  

Enhancing Fiducial Point Detection in Imaging Photoplethysmography Through Spatial Fusion

Current Directions in Biomedical Engineering
Imaging photoplethysmography (iPPG) enables contactless assessment of blood volume changes but is susceptible to noise, particularly under impaired perfusion.
Tauber Samuel, Wiede Christian, Wichum Felix, Seidl Karsten   +3 more
doaj   +1 more source

Duality in response of intracranial vessels to nitroglycerin revealed in rats by imaging photoplethysmography. [PDF]

Sci Rep, 2023
Sokolov AY, Volynsky MA, Potapenko AV, Iurkova PM, Zaytsev VV, Nippolainen E, Kamshilin AA.   +6 more
europepmc   +1 more source

Cerebral and peripheral haemodynamics at rest and in response to orthostasis during 3 days of simulated heatwave

Experimental Physiology, EarlyView.
Abstract Acute heat stress reduces cerebral haemodynamics and orthostatic tolerance. However, the haemodynamic response to orthostasis during prolonged heat stress typical of heatwaves is unknown. We hypothesised that thermoregulatory‐induced elevations in peripheral haemodynamics during 3 days of simulated heatwave would exacerbate orthostatic‐induced
Alexander T. Friend, Samuel J. Oliver, Lydia L. Simpson, Carmen Possnig, Gabriella M. K. Rossetti, Jason T. Fisher, Lydia Tsoutsoubi, Konstantinos Mantzios, Urša Ciuha, Leonidas G. Ioannou, Igor B. Mekjavic, Justin S. Lawley   +11 more
wiley   +1 more source

Wearable Photoplethysmography Device for Telemetric Monitoring of Pulse Wave Parameters

At present efficient training requires a complex approach incorporating the control of the exercise intensity and observation of athlete physiological variables.
Krieviņš, Ivars, Rubīns, Uldis, Mečņika, Viktorija, Marcinkevičs, Zbignevs, Kviesis, Edgars   +4 more
core  

Pulmonary arterial mechanoreceptors mediate sustained sympathoexcitation during high altitude hypoxia in humans

Experimental Physiology, EarlyView.
Abstract Sympathetic nervous system activation is a hallmark of high‐altitude hypoxia, yet the afferent mechanisms remain incompletely defined. We examined the relative contributions of pulmonary arterial mechanoreceptors and carotid chemoreceptors – two excitatory pathways co‐activated by hypoxia – to sustained sympathoexcitation at altitude.
Michiel T. Ewalts, Lydia L. Simpson, Jack S. Talbot, Elliott J. Jenkins, Travis D. Gibbons, Connor A. Howe, Lauren E. Maier, Emily R. Vanden Berg, Alex M. Williams, Philip N. Ainslie, Samuel J. Oliver, Craig D. Steinback, Mike Stembridge, Jonathan P. Moore   +13 more
wiley   +1 more source