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 29 for “"sympathetic nerve activity"”.
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A role for insulin in the central control of sympathetic nerve activity in humans
… in healthy humans, result in robust increases in sympathetic nerve activity. In addition to evoking increases in central sympathetic outflow, recent work in rats has reported a modulatory role for insulin in the regulation of arterial baroreflex control of sympathetic nerve activity. The …
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The role of spontaneous bursts of muscle sympathetic nerve activity in mediating peripheral vascular responses and cardiovascular hemodynamics in resting man
… AT AUTHOR'S REQUEST.] The ability for sympathetic nerve activity to dynamically evoke vasoconstriction is paramount for the regulation of blood flow and blood pressure. However, very little information is available to characterize the influence of spontaneously occurring sympathetic …
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The Integrative relationship between insulin and insulin-like growth factor 1 induced cardiovascular responses and sympathetic nervous responses
… muscle. Insulin has also been showed to increase sympathetic nerve activity that may play a role in the regulation of cardiovascular dynamics. This study investigated the effects of insulin and IGF-l on cardiovascular parameters and sympathetic nerve activity and the correlation between them. We …
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Ο ΕΛΕΓΧΟΣ ΤΗΣ ΔΡΑΣΤΙΚΟΤΗΤΑΣ ΤΟΥ ΣΥΜΠΑΘΗΤΙΚΟΥ ΝΕΥΡΙΚΟΥ ΣΥΣΤΗΜΑΤΟΣ ΣΤΑ ΑΚΡΑ ΔΙΑΒΗΤΙΚΩΝ ΚΑΙ ΜΗ ΔΙΑΒΗΤΙΚΩΝ ΑΡΤΗΡΙΟΠΑΘΩΝ ΑΣΘΕΝΩΝ ΜΕ ΤΗ ΧΡΗΣΙΜΟΠΟΙΗΣΗ ΤΩΝ ΧΡΩΜΑΤΟΓΡΑΦΙΚΩΝ ΜΕΘΟΔΩΝ
… CHROMATOGRAPHIC DYING TESTS. IN DETECTION OF THE SYMPATHETIC NERVOUS SYSTEM FUNCTIONS. THE TESTS WHICH WE USED WERE THE NINHYDRIN AND O-OPHTHALALDEYDE TESTS, BASED ON THE REACTION OF THE COMPONENTS OF THE SWEAT. THESE TESTS ARE VALUABLE AND HIGHLY SPECIFIC FOR THE STUDY OF THE SYMPATHETIC NERVE …
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Investigation Of Whether Sedentary And Physically Active Conditions Lead To Altered Gabaergic Signaling In The Rvlm
… disease has been associated with elevated basal sympathetic nerve activity. The rostral ventrolateral medulla is a bilateral brainstem region that is an important for the control of resting and reflex control of sympathetic nerve activity and blood pressure. The activity of these neurons in this …
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Characterization of Sympathetic Ganglion Sensitivity to Substance P in a Genetic and a Non-Genetic Rat Model of Hypertension.
… injection of substance P (SP) stimulates sympathetic ganglia to evoke a greater increase in renal sympathetic nerve activity, heart rate (HR) and blood pressure (BP) in hypertensive than normotensive rats due to upregulation of the NK<sub>1</sub> receptor. These experiments were designed …
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The Measurement and Interpretation of Intracranial Pressure
… the rest of the body. Furthermore, the increased sympathetic tone is associated with many cardiovascular diseases, but its origins are not clearly understood. Therefore, finding a causative link between ICP dynamics and arterial pressure (AP, i.e. AP-ICP=CPP) may depend upon understanding how …
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Sympathetic nervous system in the development of mild DOCA-salt hypertension
… of arterial pressure, primarily by modulating sympathetic nerve activity. Sympathetic nervous system activation contributes to the pathogenesis of human hypertension. Recent evidence points to mineralocorticoids as a cause of sympathetic overactivity in hypertension. In the studies for this …
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The role of the ventrolateral medulla in the pressor reflex to static muscular contraction
… correlated temporally with a 2 to 6 Hz rhythm of sympathetic nerve activity. Sympathetic related rhythms of discharge were found in 45 of 117 VLM neurons examined in baroreceptor intact and barodenervated cats. Furthermore, 29 of the 45 sympathetic VLM neurons were excited by hindlimb muscular …
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Circadian Rhythm in Intrinsic Heart Rate
… eliminate the potential confounding effects of activity on daily HR variation. We found that unconscious mice still showed diurnal HR fluctuation with peaks of HR in the dark period (ZT 18) and HR troughs in the light period (ZT 6). The amplitude of circadian HR fluctuations was reduced by ~2/3 …
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Integrated modulation of sympathetic tone in the microcirculation by oxygen, adenosine, and nitric oxide
… constriction during periods of increased sympathetic nerve activity in the rat small intestine. In this project, we sought to test the hypothesis that adenosine, formed in response to a flow-dependent fall in local PO2, serves as the stimulus to preserve endothelial NO release under these …
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The effects of prostaglandin inhibition on the sympathetic and pressor responses to muscular contraction and postcontraction muscle ischemia
… effect of prostaglandin (PG) inhibition on the sympathetic and pressor responses to isometric handgrip (HG) at 40% of maximal voluntary contraction (MVC) to exhaustion and postcontraction muscle ischemia (PC). To accomplish this heart rate (HR), arterial pressure (n=10) and plasma norepinephrine …
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Tolerance to Lower Body Negative Pressure: Effects of Sex and Sufentanil
… blood pressure (finometer), and muscle sympathetic nerve activity (microneurography: radial nerve). Each underwent a double-blinded, randomized crossover study where they received either a placebo or drug on two different trial days. Data for the first study were obtained solely from the …
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Muscle Metaboreflex Control Of Cardiovascular Function In Hypertension
… the muscle leading to a reflex increase in sympathetic outflow generating substantial increases in mean arterial pressure (MAP), cardiac output (CO) and heart rate (HR) - termed the muscle metaboreflex. When the reflex is activated during submaximal dynamic exercise, the pressor response …
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Cardiovascular Risk Indicators and Health-Related Quality of Life in Women Veterans with PTSD
… (resting heart rate, blood pressure, and muscle sympathetic nerve activity) and physical and mental health-related quality of life (SF-36) in a sample of women veterans with PTSD to a sample of nonveteran women without PTSD. In addition, hierarchical multiple regression analyses were used to …
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Role of the renal nerves in hypertension
… trials showing that ablation of the renal nerves (renal denervation; RDNX) has a significant antihypertensive effect in drug resistant patients. However, failure of the most recent sham-controlled trial has raised many questions regarding this treatment. Chief among them is whether the …
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Modelling of Long and Short Term Blood Pressure Control Systems
… components. The renal vasculature response to sympathetic nerve activity is also modelled by a nonlinear grey-box model. The model represents the renal blood ow response to electrical renal nerve stimulation, under the condition of renal denervation, which can aid in the development of an …
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Arterial Baroreflex Regulation of Sympathetic Discharge During Maximal Voluntary End-Inspiratory Apnea
The sympathetic nervous system (SNS) increases sympathetic outflow during physiological stress to maintain blood pressure (BP) homeostasis. The arterial baroreflex represents a critical mechanism regulating sympathetic outflow during rest and physiological stress. Volitional apnea, seen in …
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Hypothalamic and medullary modulation of cardiorespiratory responses to hypoxia and hypercapnia
… kynurenic acid resulted in increased respiratory activity and enhanced respiratory responses to hypoxic and hypercapnic stimuli. Microinjections just caudal, however, typically resulted in apnea. The results suggest that excitatory amino acid transmission in the rostral VLM exerts a tonic …
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Interaction between Adrenergic and Nitric Oxide-releasing Nerves in Cerebral Arteries
… of which adrenergic and nitric oxide-releasing nerves are components. My research examined the interaction between these two nerve-types with emphasis on the mechanisms involved as well as on changes in their functions as the animal adapts to stress such as chronic hypoxia.</p> <p>An overview of …
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