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Showing 1 to 20 of 20 for “"reactive hyperemia"”.
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Coronary Reactive Hyperemia
Introduction: The mechanism of post ischemic reactive hyperemia is still unknown but now thought to be multifactorial and perhaps involving purinergic signalling. Purines such as ATP and ADP have recently been discovered to play a vital role in the regulation of vascular tone. We postulated that …
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Changes in microvascular hematocrit during post-occlusive reactive hyperemia: descriptions and mechanisms
… spectroscopy (NIRS), during post-occlusive reactive hyperemia (PORH). Mechanisms of reactive hyperemia within skeletal muscle were also explored. The investigation detailed in Chapter 2 of this dissertation found that the differing time courses of the kinetic responses of both oxy- and …
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Assessing Endothelial Dysfunction Estimating the Differences Between 3 Minute and 5 Minute Reactive Hyperemia
… a lower standard cuff occlusion time to induce reactive hyperemia in assessing endothelial dysfunction. In this study, strong evidence was found by a novel technique that used oscillometric methods, which supported that 3 minute reactive hyperemia was sufficient to elicit a significant …
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Influence of Cardiovascular Risk factors on Remote Ischemic Preconditioning
… microvascular endothelial vasodilation during reactive hyperemia before and after 65 min of left arm reperfusion injury (20 min brachial artery ischemia followed by 45 min reperfusion) that was preceded by rIPC (right arm: 3X5 min ischemia/reperfusion). All subjects provided written informed …
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Mechanisms of Blood Flow Restriction Exercise in Skeletal Muscle Adaptations
… exercise as the restriction cuffs are removed, reactive hyperemia occurs, and the increase in nutritive delivery to the muscle is believed to be one of the driving factors that stimulate muscle protein synthesis. Although, mimicking the effect of reactive hyperemia using a pharmacological …
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Resting Microvascular and Autonomic Function in Relation to Age and Sex Hormone Concentrations
… Microvascular function was assessed with reactive hyperemia using the microvascular function index (MFI) technique (5mins baseline, circulatory occlusion and reperfusion) and was calculated using the area under the curve of pulse waveforms before and after occlusion/reperfusion. Autonomic …
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Test Re-Test Reliability of Brachial Artery Flow-Mediated Dilation in Healthy Adults
… (resting condition) and immediately following reactive hyperemia. FMD was calculated as percent change in diameter from baseline. Results: FMD measurements for interday comparisons demonstrated moderate to strong reliability (intraclass correlation coefficient [ICC] = 0.73, P=0.004; CV = …
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The Influence of Obstructive Sleep Apnea Syndrome on Insulin Resistance, Metabolic Syndrome, and Endothelial Dysfunction in Young Men
… vasodilatation being assessed from forearm reactive hyperemia after a 5-minute period of upper arm occlusion. Statistics: One-way ANOVA was used to determine group differences in variables. Two-way ANOVA was used to evaluate group x time interactions during the 2-minute recovery period …
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Design of a thermal diffusion sensor for noninvasive assessment of skin surface perfusion and endothelial dysfunction
… ischemia, a phenomenon known as post-occlusive reactive hyperemia (PORH). In my research, I have reviewed the literature regarding endothelial dysfunction and its association with a wide range of cardiovascular risk factors. I have also described the mechanisms thought to link endothelial …
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Peripheral Vascular Function in Young Adults with Increased Risk of Cardiometabolic Disease
… n=16) matched individuals during post-occlusive reactive hyperemia (RHBF), passive limb movement (PLM) and Functional Sympatholysis (FS) trials. Carotid femoral pulse wave velocity (cfPWV) was also collected at baseline, and all values were compared between the Control (Con; negative …
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The Effects of Lowering Cholesterol on Vasodilation
… by high-resolution ultrasound at rest and during reactive hyperemia pre and postintervention. Fifty-three subjects with cholesterol levels above 240 mg/dl were randomly assigned to three groups: Lifestyle change (n=17), medication (n=17), and placebo (n=19).</p> <p>All individuals were assessed …
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The role of acute phosphate supplementation in endothelium-dependent and -independent vasodilation
… the occlusion of blood flow to the forearm (reactive hyperemia). Blood phosphate concentrations were significantly greater in PHOS vs. PLAC, but did not increase differently between the two groups. Blood phosphate concentrations were significantly greater 60 min vs. 20 min post-supplement in …
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Developing a Technique to Create a Uniform, Targeted, Transient Shear Stress Stimulus to Assess Endothelial Function
… stress created with limb occlusion release [reactive hyperemia (RH)-FMD]. RH-FMD interpretation is complicated because differences in RH-FMD between groups/conditions may reflect stimulus magnitude variability rather than distinct endothelial function. Moreover, smaller diameter arteries tend …
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The role of fibroblast growth factor-2 (FGF2) in vascular remodeling and adaptation
… these experiments led to the observation that reactive hyperemia was impaired in ischemic limb of Fgf2⁻/⁻ mice. These results indicate that vessel responsiveness is altered in the collateral circulation of the ischemic Fgf2⁻/⁻ limb. This possible identification of FGF2 as a "functional" factor …
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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
… 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 induced increases in shear stress (EX-FMD). The purpose of this study was 1) to compare cortisol responses …
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The Impact of Chronic E-Cigarette Use on Flow- Mediated Dilation Elicited by a Sustained Shear Stress Stimulus
… endothelial dependent dilation, this is known as reactive hyperemia flow-mediated dilation (RH-FMD). Three previous studies have assessed the impact of chronic e-cigarette use on human endothelial function all using RH-FMD, with only one finding a significant impairment between users and controls. …
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The relation between sex, age and vascular function in the Framingham Heart Study
… 95%CI-0.061,-0.023, p=0.199 for difference). For reactive hyperemia, we found a greater decline in older participants for both men and women (for young men, β=-0.087 95%CI-0.200,0.027 compared to older men β=-0.776 95%CI-0.883,-0.669 p<0.0001 for difference, for young women β=0.141 95%CI …
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Local Control of Blood Flow in the Bronchial Circulation of Dogs
… To determine if adenosine is responsible for the reactive hyperemia after lung hyperinflation, I repeated lung inflation before and during DMPX. DMPX did not reduce the vasodilation following lung inflation (ACbr = 1.9±0.4 before and 1.2±0.2 ml/min/100mmHg during DMPX). Therefore, bronchial …
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Multispectral Imaging of Skin Oxygenation
… StO2 dynamics was measured using a postocclusive reactive hyperemia (PORH) protocol. The change of StO2 measured by our system was compatible with the oxygen measurements by other oximetry techniques. Finally, in order to test if our StO2 imaging method is affected by additional background …