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 11 of 11 for “"Orthostatic stress"”.
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Computational models of cardiovascular response to orthostatic stress
… experimental effort, the mechanisms underlying orthostatic intolerance (OI) following spaceflight remain elusive. The number of hypotheses still under consideration and the lack of a single unifying theory of the pathophysiology of spaceflight-induced OI testify to the difficulty of the problem. …
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Cardiovascular Consequences of Estrogen Deficiency: Studies in Premenopausal Women
… cardiovascular responses to exercise and orthostatic stress in ExFHA women with responses in physically active (ExOv) and sedentary (SedOv) eumenorrheic ovulatory women. Measures included calf blood flow (BF), brachial artery (BA) endothelial dependent and independent function, shear rate …
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Cardiovascular and Inflammatory Consequences of Adverse Childhood Experiences
… lower LVM, independent of recent life stress, smoking, physical activity, and inflammation while childhood maltreatment demonstrated a negative effect on EF independent of covariates. Whether this persists into older age is unknown. Notably, Studies 1 and 2 identified the MMP …
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Model Based Analysis of QT Variability Independent of Heart Rate and Respiration
… increase in sympathetic activation elicited by orthostatic stress. Measurements of QTV independent of heart rate and respiration from single leads (II and V5) are compared to that of multi-lead approaches in a group of coronary artery disease patients to investigate the suitability of singlelead …
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Development of fMRI compatible lower body negative pressure system
… (LBNP) system provides a controlled, measured orthostatic stress to the cardiovascular system, which can be used with a magnetic resonance imaging (MRI) machine to study cardiovascular and cerebrovascular responses to graded LBNP. In the past, even though functional MRI (fMRI) was considered as …
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The effects of magnesium administration on cardiac ventricular function, heart rate variability, and myocardial morphological changes in a chronic diabetes disease model in rats
… function using tail pulse plethysmography. Orthostatic stress was induced by tilting the animals from flat position to 70° head-up position. Ex-vivo hemodynamic and electrocardiograph (ECG) measurements were performed on a Langendorff perfusion system. Histological studies of ventricular …
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System identification of dynamic closed-loop cardiovascular control of total peripheral resistance by arterial and cardiopulmonary baroreceptors
… (CO) and arterial blood pressure (Pa) against orthostatic stress during re-entry and in the post-flight period. To date, available countermeasures have not been able to eliminate the observed orthostatic hypotension. The mechanisms responsible for the observed orthostatic intolerance are not …
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Innovative spinal cord injury rehabilitation in the context of a middle-income country: a pilot randomised control study investigating physiological and psychological effects
… than ABT in improving cardiac responses to orthostatic stress, with standing heart rate at 24-weeks being significantly lower in the RLT group (75.1 ± 15.0 beats/min) compared to the ABT group (95.6 ± 12.6 beats/min). Standing and RLT had similar effects on the parasympathetic nervous …
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The effects of magnesium treatment on short-term changes in heart rate variability, ventricular function and lipid profile in streptozotocin-induced diabetic rats
… < 0.05, n = 9/group). In addition, Mg²⁺ restored orthostatic stress induced changes in heart rate, and LF/HF ratio in diabetic rats (p < 0.05, n = 9/group). In isolated hearts, Mg²⁺ reversed the diabetes-induced decrease in LV end-diastolic elastance (p < 0.05, n = 6/group) and the right shift of …