Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Hemodynamic Responses"”.
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Acute hemodynamic responses to yoga exercise
… of the present study was to determine the acute hemodynamic responses to twenty-three select yoga postures in advanced and novice yoga practitioners. Additionally, we sought to determine if trunk flexibility is related to arterial stiffness. Using a cross-sectional study design, 37 apparently …
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Investigating Hemodynamic Responses to Electrical Neurostimulation
… resistance. The mechanisms by which these hemodynamic changes occur is still under investigation. The primary aim of this thesis is to elucidate these mechanisms through a thorough synthesis of the existing literature on this subject. Neurostimulation, specifically TENS, is thought to …
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Design and statistical analysis of fMRI experiments to assess human brain hemodynamic responses
… to assess the steady-state linearity of the hemodynamic system in prinwy visual cortex (Vl) for an event-related visual stimuli. In agreement with previous studies, we found that the system was approximately linear. Given this result, we used linear estimation techniques to estimate the …
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Photoplethysmography for non-invasive measurement of bone hemodynamic responses to changes in external pressure
… a decrease in bone mineral density (BMD). Bone hemodynamics remains poorly understood and loss of BMD is still one of the limiting factors to long duration human spaceflight. Developments in photoplethysmography (PPG) hardware have made it a promising tool for non-invasive bone hemodynamic …
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Effects of α1-receptor blockade on the hemodynamic responses to exercise in young normotensives and hypertensives
… if α1- adrenergic receptor blockade alters the hemodynamic response to exercise in young (<25 yr) male adult borderline hypertensives differently than in young normotensives. Five hypertensive (HTN, MAP>105 mmHg) and 7 normotensive (NTN, MAP<95 mmHg) college-age males underwent two 30 min bouts …
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Hemodynamic Responses to Isometric Contractions of the Finger Flexor and Leg Extensor Muscle Groups in Men 18-30 and 50-70 Years of Age
The central circulatory responses of individuals 18-30 and 50-70 years of age were assessed while performing isometric hand-grip and isometric leg extension tests. The object was to ascertain which cardiovascular variables(s), heart rate, stroke volume, cardiac output, total peripheral resistance, …
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Investigating the neuroendocrine and hemodynamic responses to physical and psychological stress tasks and their effects on endothelial-dependent flow mediated vasodilation using a sustained stimulus
Few studies have compared cortisol responses to psychological and physical stress tasks with or without social evaluation. Flow-mediated dilation (FMD) with reactive hyperemia is impaired following acute stress though less is known regarding the impact of stress and cortisol on FMD with exercise …
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Simultaneous Integrated Functional Magnetic Resonance Imaging and Optical Tomography in the Near Infrared Spectrum (Sinfonis) for Studying Hemodynamic and Neuronal Responses in the Human Brain
The hemodynamic responses reconstructed from DOT have shown reasonably good consistency with that of the BOLD fMRI result. It has been discovered from the correspondence between the two results that the change in oxyhemoglobin concentration may also play a secondary role in the BOLD signal. …
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High-density intraoperative brain monitoring during cardiac surgery.
… of functional brain activity by measuring hemodynamic responses. Most existing functional brain imaging methods are only capable of examining cere-bral oxygenation at the frontal lobes during cardiac surgery; thus, the majority of brain regions remain unmonitored. In an attempt to …
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PREFRONTAL CORTEX ACTIVITY DURING ATTENTIONAL BIAS CONDITIONING WITH FEARFUL FACES: A NEAR-INFRARED SPECTROSCOPY ANALYSIS
… examined using the dot-probe task. In addition, hemodynamic responses in the prefrontal cortex (PFC) were measured using near-infrared spectroscopy (NIRS). It was hypothesized that after pairing a neutral stimulus (a colored square) with a fearful face, attentional bias toward the fearful face …
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A MATLAB-Based Subject-Specific Framework for Vessel Quantification and Localization in Longitudinal Photoacoustic Neuroimaging
… of cerebral blood vessels and the measurement of hemodynamic responses, at single vessel resolution, to neural stimulation. However, existing approaches do not provide a unified and systematic framework for consistently localizing vessels and quantifying vessel related functional responses across …
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Hemodynamic Changes after Endotracheal Iintubation with a Lightwand or a Laryngoscope in Patients with Cerebral Aneurysm
… intubation with lightwand results in less hemodynamic stimulation compared with direct laryngoscopy. We therefore conducted this study to assess that the lightwand technique could result less hemodynamic changes during intubation. Twenty six patients undergoing cerebral aneurysm clipping …
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Genetically encodable calcium sensors for Magnetic Resonance Imaging
… To achieve higher amplification we leverage the hemodynamic response, which is coupled to neuronal activity through a calcium-activated enzyme, neuronal nitric oxide synthase (nNOS). We show that chemical stimulation of ectopically expressed neuronal nitric oxide synthase (nNOS) elicits an …
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The Acute And Chronic Effects Of Resveratrol On Renal Function And Blood Pressure
… bolus of resveratrol influenced changes in renal hemodynamics by increasing renal blood flow and decreasing renal vascular resistance. The mechanism of renal vasodilation was nitric oxide dependent and through a reduction of endogenous reactive oxygen species. Resveratrol-induced renal …
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Cerebral hemodynamic response to faces and emotions in infants at high risk for autism
… described herein aims to: 1) characterize the hemodynamic response to faces in normal infants at six months of age as measured by the Hitachi ETG-4000 functional Near-Infrared Spectroscopy (fNIRS) system; 2) Simultaneously measure orbitofrontal hemodynamic responses to social/emotional …
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The relationship between markers of disease severity in obstructive sleep apnea patients and hemodynamic and respiratory function during graded exercise testing
… (1): In order to establish reliability of hemodynamic measures to be used during exercise testing, a study was conducted on the acetylene single-breath cardiac output (Qc) technique in 15 healthy subjects. This was completed in order to establish reliability of exercise Qc and total …
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Dynamic state-space estimation of the hemodynamic response with Near-Infrared Spectroscopy
… Spectroscopy (NIRS) allows the recovery of the hemodynamic response associated with evoked brain activity. The signal is contaminated with systemic physiological interference which occurs in the superficial layers of the head as well as in the brain tissue. The back-reflection geometry of the …
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Neural And Humoral Control Of Regional Vascular Beds Via A1 Adenosine Receptors Located In The Nucleus Of The Solitary Tract
… adenosine</p> <p>receptors yields variable hemodynamic responses with prevailing pressor and iliac</p> <p>vasoconstrictor responses. These responses are accompanied with differential</p> <p>activation of regional sympathetic activity (adrenal>>renal≥lumbar) and inhibition of</p> …
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The acute metabolic and hemodynamic effects of body inversion during rest and exercise
… was to examine the acute metabolic and hemodynamic responses of men at rest and during exercise in the inverted posture (90° head-down tilt) versus the supine and standing postures. The parameters investigated were oxygen consumption(V̇O₂), heart rate(HR), systolic blood pressure (SBP), …
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