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PubMed Journals Articles About "Regulation Choroidal Blood Flow During Isometric Exercise Different" RSS

11:42 EDT 23rd March 2019 | BioPortfolio

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Showing "Regulation Choroidal Blood Flow During Isometric Exercise Different" PubMed Articles 1–25 of 19,000+

Regulation of Choroidal Blood Flow During Isometric Exercise at Different Levels of Intraocular Pressure.

There is evidence that choroidal blood flow (ChBF) is regulated in a complex way during changes in ocular perfusion pressure (OPP). We hypothesized that ChBF regulates better in response to changes in mean arterial pressure (MAP) than in intraocular pressure (IOP).


Defective Choroidal Blood Flow Baroregulation and Retinal Dysfunction and Pathology Following Sympathetic Denervation of Choroid.

We sought to determine if sympathetic denervation of choroid impairs choroidal blood flow (ChBF) regulation and harms retina.

Optic nerve head blood flow regulation during changes in arterial blood pressure in patients with primary open-angle glaucoma.

Abnormal autoregulation of optic nerve head blood flow (ONHBF) has been postulated to play an important role in primary open-angle glaucoma (POAG). We used laser Doppler flowmetry (LDF) to estimate quantitatively the ONHBF and compared ONHBF autoregulation between glaucoma patients and healthy controls during isometric exercise.


A brief submaximal isometric exercise test 'unmasks' systolic and diastolic masked hypertension.

An exaggerated blood pressure (BP) response during dynamic exercise testing has been proposed as an additional screening tool to identify systolic masked hypertension (masked-HYP). However, masked-HYP in young people is often characterized by an elevated DBP. Static/isometric exercise elicits augmented sympathetic stimulation causing greater increases in both SBP and DBP than dynamic exercise.

A brief submaximal isometric exercise test 'unmasks' systolic and diastolic masked hypertension.

An exaggerated blood pressure (BP) response during dynamic exercise testing has been proposed as an additional screening tool to identify systolic masked hypertension (masked-HYP). However, masked-HYP in young people is often characterized by an elevated DBP. Static/isometric exercise elicits augmented sympathetic stimulation causing greater increases in both SBP and DBP than dynamic exercise.

Acute reduction in posterior cerebral blood flow following isometric handgrip exercise is augmented by lower body negative pressure.

The mechanism(s) for the increased occurrence of a grayout or blackout, syncope, immediately after heavy resistance exercise are unclear. It is well-known that orthostatic stress increases the occurrence of postexercise syncope. In addition, previous findings have suggested that hypo-perfusion, especially in the posterior cerebral circulation rather than anterior cerebral circulation, may be associated with the occurrence of syncope. Herein, we hypothesized that the postexercise decrease in posterior, but n...

Muscle metaboreflex activation via postexercise ischemia as a tool for teaching cardiovascular physiology for undergraduate students.

The cardiovascular responses to exercise are mediated by several interactive neural mechanisms, including central command, arterial baroreflex, and skeletal muscle mechano- and metaboreflex. In humans, muscle metaboreflex activation can be isolated via postexercise ischemia (PEI), which increases sympathetic nerve activity and partially maintains the exercise-induced increase in arterial blood pressure. Here, we describe a practical laboratory class using PEI as a simple and useful technique to teach cardio...

Effect of increased inspiratory muscle work on blood flow to inactive and active limbs during submaximal dynamic exercise.

What is the central question of this study? Increased respiratory muscle activation is associated with neural and cardiovascular consequences via the respiratory muscle metaboreflex. Does increased sympathetic vasoconstriction originating from the respiratory musculature elicit a reduction in blood flow to an inactive limb in order to maintain blood flow to an active limb? What is the main finding and its importance? Arm blood flow was reduced while leg blood flow was preserved during mild leg exercise with...

Blood Flow Restriction Only Increases Myofibrillar Protein Synthesis with Exercise.

Combining blood flow restriction (BFR) with exercise can stimulate skeletal muscle hypertrophy. Recent observations in an animal model suggest that BFR performed without exercise can also induce anabolic effects. We assessed the impact of BFR performed both with and without low-load resistance-type exercise (LLRE) on in vivo myofibrillar protein synthesis rates in young men.

Cerebral blood flow is not modulated following acute aerobic exercise in preadolescent children.

Cognitive enhancements following a single bout of exercise are frequently attributed to increases in cerebral blood flow, however to date we have little understanding of the extent to which such bouts of exercise actually even influence cerebral blood flow following the cessation of exercise. To gain such insight, both regional and global changes in cerebral blood flow were assessed using 3D pseudo-continuous arterial spin-labeled magnetic resonance imaging in a sample of 41 preadolescent children. Using a ...

Cerebral Blood Flow during Interval and Continuous Exercise in Young and Old Men.

Ageing is associated with impaired cerebral blood flow (CBF) and increased risk of cerebrovascular disease. Acute increases in CBF during exercise may initiate improvements in cerebrovascular health, but the CBF response is diminished during continuous exercise in older adults. The effect of interval exercise for promoting increases in CBF in young and old adults is unknown.

Dietary nitrate improves muscle microvascular reactivity and lowers blood pressure at rest and during isometric exercise in untreated hypertensives.

This double-blind, cross-over study examined in drug-naïve hypertensives the effects of a single-dose of dietary nitrate (beetroot juice, BRJ) on (i) office/ambulatory blood pressure (BP) and arterial stiffness, (ii) muscle microvascular function, and (iii) hemodynamic responses and cardiovagal baroreceptor sensitivity (cBRS) at rest and during isometric exercise.

Acute blood pressure responses after different isometric handgrip protocols in hypertensive patients.

The present study analyzed blood pressure responses after a single session of isometric handgrip exercise performed with different volumes and intensities by patients with hypertension.

Neurohumoral and ambulatory haemodynamic adaptations following isometric exercise training in unmedicated hypertensive patients.

Hypertension remains the leading modifiable risk factor for cardiovascular disease. Isometric exercise training (IET) has been shown to be a useful nonpharmacological intervention for reducing resting blood pressure (BP). This study aimed to measure alterations in office BP, ambulatory BP, cardiac autonomic modulation and inflammatory and vascular biomarkers following a programme of IET in unmedicated hypertensive patients.

A comparison of blood pressure reductions following 12-weeks of isometric exercise training either in the laboratory or at home.

Isometric exercise training (IET)-induced reductions in resting blood pressure (RBP) have been achieved in laboratory environments, but data in support of IET outside the laboratory are scarce. The aim of this study was to compare 12 weeks of home-based (HOM) IET with laboratory-based, face-to-face (LAB) IET in hypertensive adults. Twenty-two hypertensive participants (24-60 years) were randomized to three conditions: HOM, LAB, or control (CON). IET involved isometric handgrip training (4 × 2 minutes at 3...

Cerebral Blood Flow during Exercise in Heart Failure: Impact of Ventricular Assist Devices.

In healthy individuals cerebral blood flow (CBF) increases during exercise, but few studies have compared changes in CBF during exercise in patients with heart failure (HF) to healthy controls (CTRL), or assessed the effects of left ventricular assist devices (LVADs). We hypothesised that subjects implanted with LVADs would exhibit impaired cerebrovascular responses to cycle exercise when compared to age- and sex-matched healthy CTRL subjects, but enhanced responses relative to subjects with HF.

Effects of Pulmonary Flow Heterogeneity on Oxygen Transport Parameters in Exercise.

Under resting normoxic conditions, the healthy lung has ample oxygen uptake capacity relative to oxygen demand, but during exercise, increased oxygen demand and utilization become increasingly dependent on ventilation-perfusion matching. A mathematical model is used to investigate the effect of pulmonary flow heterogeneity, as characterized by the coefficient of variation (CV) of capillary blood flow, on pulmonary oxygen uptake in exercise. The model reveals that any level of heterogeneity up to a CV of 3 i...

Exercise-Induced Hyperemia is Associated with Knee Extensor Fatigability in Adults with Type 2 Diabetes.

The aim of this study was to compare fatigability, contractile function, and blood flow to the knee extensor muscles after dynamic exercise in patients with type 2 diabetes mellitus (T2DM) and controls. The hypotheses were that patients with T2DM would demonstrate greater fatigability than controls, and greater fatigability would be associated with lower exercise-induced increase in blood flow and greater impairments in contractile function. Fifteen patients with T2DM (8 men; 62.4±9.0 years; 30.4±7.7 kg·...

Intercostal Blood Flow is Elevated in Old Rats during Submaximal Exercise.

Respiratory muscle blood flows (BF) increase substantially during exercise in younger adult rats. As aging is associated with altered pulmonary function, we hypothesized that old rats will have greater intercostal BF and vascular conductances (VC) than young rats during submaximal exercise.

Circulatory responses at the onset of handgrip exercise in patients with parkinson disease.

What is the central question of this study? The initial circulatory response to isometric exercise in young healthy subjects is thought to be cholinergic-mediated. Do patients with Parkinson Disease (PD), a specific population known to present cholinergic dysfunction, present impairment in these initial circulatory responses? What is the main finding and its importance? The initial fall in total peripheral resistance was absent in patients with PD, as well as in older subjects, which augmented the pressor r...

4D-Flow MRI: Technique and Applications.

 Blood flow through the cavities of the heart and great vessels is pulsatile and is subject to time and multidirectional variations. To date, the recording of blood flow in multiple directions and phases has been limited. 4D-flow MRI offers advantages for the recording, visualization and analysis of blood flow.

Left ventricular blood flow patterns at rest and under dobutamine stress in healthy pigs.

Intracardiac blood flow patterns are affected by the morphology of cardiac structures and are set up to support the heart's pump function. Exercise affects contractility and chamber size as well as pre- and afterload. The aim of this study was to test the feasibility of four-dimensional phase contrast cardiovascular MRI under pharmacological stress and to study left ventricular blood flow under stress. 4D flow data were successfully acquired and analysed in 12 animals. During dobutamine infusion, heart rate...

Pulse wave reflection responses to bench press with and without practical blood flow restriction.

Resistance exercise is recommended to increase muscular strength, but may also increase pulse wave reflection. Resistance exercise combined with practical blood flow restriction (pBFR) on pulse wave reflection is unknown.

Maternal cardioautonomic responses during and following exercise throughout pregnancy.

Blood pressure regulation during pregnancy is poorly understood. Cardiovagal baroreflex gain (BRG) is an important contributor to blood pressure regulation via its influence on heart-rate. Heart-rate fluctuations occur in response to various physiological stimuli and can be measured using heart-rate variability (HRV). It is unclear how these mechanisms operate during pregnancy, particularly related to exercise. We examined BRG and HRV prior to, during, and following prenatal exercise. Forty-three pregnant (...

Role of Noradrenergic Brain Nuclei in the Regulation of Carotid Artery Blood Flow: Pharmacological Evidence from Anesthetized Pigs with Alpha-2 Adrenergic Receptor Modulator Drugs.

Cerebral hypoperfusion and degeneration of the noradrenergic locus coeruleus (LC) occur early in Alzheimer's disease (AD). Cerebral blood vessels are densely innervated by noradrenergic projections from the LC suggesting a functional role for the regulation of cerebral blood flow (CBF). Experimental LC stimulation, however, has provided no clarity as decreases or increases in CBF were reported from different experimental settings and investigators.


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