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Phase Coupling Between Baroreflex Oscillations of Blood Pressure and Heart Rate Changes in 21-Day Dry Immersion.
Front Physiol
May 2020
State Research Center of the Russian Federation, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia.
Introduction: Dry immersion (DI) is a ground-based experimental model which reproduces the effects of microgravity on the cardiovascular system and, therefore, can be used to study the mechanisms of post-flight orthostatic intolerance in cosmonauts. However, the effects of long-duration DI on cardiovascular system have not been studied yet. The aim of this work was to study the effects of 21-day DI on systemic hemodynamics and its baroreflex control at rest and during head-up tilt test (HUTT).
View Article and Find Full Text PDFArginine vasopressin attenuates dysfunction of hippocampal theta and gamma oscillations in chronic cerebral hypoperfusion via V1a receptor.
Brain Res Bull
November 2019
College of Life Sciences and Key Laboratory of Bioactive Materials Ministry of Education, Nankai University, 300071 Tianjin, PR China. Electronic address:
Chronic cerebral hypoperfusion (CCH) is associated with cognitive decline in aging, Alzheimer's disease and vascular dementia. Neural oscillations and their interactions support brain communication and involve in cognitive function. Although arginine vasopressin (AVP) has been linked to spatial learning and memory, the effects of AVP on CCH in terms of the hippocampal neural network is unknown.
View Article and Find Full Text PDFSynchronization of intrinsic 0.1-Hz blood-oxygen-level-dependent oscillations in amygdala and prefrontal cortex in subjects with increased state anxiety.
Eur J Neurosci
March 2018
Institute of Biophysics and Biomedical Engineering, Faculty of Sciences, University of Lisbon, Lisbon, Portugal.
Low-frequency oscillations with a dominant frequency at 0.1 Hz are one of the most influential intrinsic blood-oxygen-level-dependent (BOLD) signals. This raises the question if vascular BOLD oscillations (originating from blood flow in the brain) and intrinsic slow neural activity fluctuations (neural BOLD oscillations) can be differentiated.
View Article and Find Full Text PDFCSF in the ventricles of the brain behaves as a relay medium for arteriovenous pulse wave phase coupling.
PLoS One
December 2017
Duke University Medical Center, Department of Neurosurgery, Durham, North Carolina 27710, United States of America.
The ventricles of the brain remain perhaps the largest anatomic structure in the human body without established primary purpose, even though their existence has been known at least since described by Aristotle. We hypothesize that the ventricles help match a stroke volume of arterial blood that arrives into the rigid cranium with an equivalent volume of ejected venous blood by spatially configuring cerebrospinal fluid (CSF) to act as a low viscosity relay medium for arteriovenous pulse wave (PW) phase coupling. We probe the hypothesis by comparing the spatiotemporal behavior of vascular PW about the ventricular surfaces in piglets to internal observations of ventricle wall motions and adjacent CSF pressure variations in humans.
View Article and Find Full Text PDFObjective: Our objective is to identify localized interactions between the renal autoregulation mechanisms over time.
Methods: A time-varying phase-randomized wavelet bicoherence detector for quadratic phase coupling between tubuloglomerular feedback and the myogenic response is presented. Through simulations we show its ability to interrogate quadratic phase coupling.
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