Results 101 to 110 of about 1,748,185 (170)

Pressure‐dependent coupling between arterial pressure and intercostal muscle blood‐flow index during acute hypotension in humans

Experimental Physiology, EarlyView.
Abstract Regulation of respiratory muscle blood flow during acute systemic hypotension remains poorly understood in humans because continuous assessment of microvascular perfusion during rapid haemodynamic transients has been technically challenging. Using diffuse correlation spectroscopy, we investigated second‐by‐second coupling between mean arterial
Masashi Ichinose, Mikie Nakabayashi, Yumie Ono   +2 more
wiley   +1 more source

Accurate and Reliable Assessment of Heart Rate in Real-Life Clinical Settings Using an Imaging Photoplethysmography. [PDF]

J Clin Med, 2022
Allado E, Poussel M, Moussu A, Hily O, Temperelli M, Cherifi A, Saunier V, Bernard Y, Albuisson E, Chenuel B.   +9 more
europepmc   +1 more source

Age‐related loss of hysteresis in the spontaneous vascular sympathetic baroreflex is associated with altered neural rather than mechanical control

Experimental Physiology, EarlyView.
Abstract The vascular sympathetic baroreflex is critical for stabilising blood pressure. A notable feature of this reflex is hysteresis, a directional asymmetry in responsiveness during rising versus falling pressure that is evident in young adults but attenuated in older age.
Guto Wyn Hughes, Denis J. Wakeham, Christopher J. A. Pugh, Zoe H. Adams, Rachel N. Lord, Jonathan P. Moore   +5 more
wiley   +1 more source

Intraoperative visualization and quantitative assessment of tissue perfusion by imaging photoplethysmography: comparison with ICG fluorescence angiography. [PDF]

Biomed Opt Express, 2022
Kashchenko VA, Zaytsev VV, Ratnikov VA, Kamshilin AA.   +3 more
europepmc   +1 more source

Pulmonary arterial mechanoreceptors modulate exercise‐induced sympathetic activation in healthy humans during moderate‐intensity hypoxic exercise

The Journal of Physiology, EarlyView.
Abstract figure legend This randomized cross‐over trial (N = 12) addressed the hypothesis that selective reduction of pulmonary arterial pressure (i.e. manipulation of pulmonary arterial mechanoreceptor activation) during hypoxic exercise would reduce sympathetic outflow (muscle sympathetic nerve activity (MSNA)) in healthy humans.
Michiel T. Ewalts, Thomas D. Griffiths, Andrew J. M. Douglas, Elliott J. Jenkins, Guto Wyn Hughes, Craig D. Steinback, Lydia L. Simpson, Samuel J. Oliver, Mike Stembridge, Jonathan P. Moore   +9 more
wiley   +1 more source

Local nature of 0.1 Hz oscillations in microcirculation is confirmed by imaging photoplethysmography

Low-frequency oscillations in the human circulatory system is important for basic physiology and practical applications in clinical medicine. Our objective was to study which mechanism (central or local) is responsible for changes in blood flow ...
Mamontov, Oleg V., Sakovskaia, Anastasiia V., Mizeva, Irina A., Kamshilin, Alexei A., Podolyan, Natalia P.   +4 more
core   +1 more source

Imaging of intranasal drug delivery to the brain

, 2020
Intranasal (IN) delivery is a rapidly developing area for therapies with great potential for the treatment of central nervous system (CNS) diseases. Moreover, in vivo imaging is becoming an important part of therapy assessment, both clinically in humans ...
Alhamami, Mosa, Yun, Yeonhee, Ruiz-Cardozo, Miguel, Miedema, Shelby B., Veronesi, Michael C., Vannier, Michael W.   +5 more
core   +1 more source

Physiological mechanisms underlying enhanced performance with blood flow restriction training: neuromuscular, vascular and metabolic adaptations

The Journal of Physiology, EarlyView.
Abstract figure legend We investigated how 6 weeks of dynamic knee‐extensor interval training with blood flow restriction (BFR‐leg) and without (CTRL‐leg) impacts performance and its mechanisms using non‐invasive methods. Specifically, we used gold‐standard methods to assess neuromuscular function, vascular function using Doppler ultrasound, and near ...
Colin Lavigne, Valentin Mons, Clément Lemineur, Oliver Meste, Georges Lefthériotis, Grégory M. Blain   +5 more
wiley   +1 more source

Assessment of Human Hemodynamics under Hyper- and Microgravity: Results of two Aachen University Parabolic Flight Experiments

Acta Polytechnica, 2007
Astronauts complain about fluid shifts from their lower extremities to their head caused by weightlessness during their flight into space. For a study of this phenomenon, RWTH Aachen University and Charité University Berlin participated in a joint ...
N. Blanik, M. Hülsbusch, M. Herzog, C. R. Blazek   +3 more
doaj  

Bayesian Optimization for Realistic PPGI Video Synthesis

Current Directions in Biomedical Engineering
A key challenge in photoplethysmography imaging (PPGI) is the limited availability of heterogeneous data. Synthetic data offers a potential solution, but accurately reproducing realistic skin color variations in 3D render engine pipelines depends on ...
Reinhardt Tobias, Rohr Maurice, Dill Sebastian, Reinhold Emily, Hoog Antink Christoph   +4 more
doaj   +1 more source