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vasodilation and exercise

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https://www.readbyqxmd.com/read/29784903/exercise-ameliorates-endoplasmic-reticulum-stress-mediated-vascular-dysfunction-in-mesenteric-arteries-in-atherosclerosis
#1
Junyoung Hong, Kwangchan Kim, Eunkyung Park, Jonghae Lee, Melissa M Markofski, Sean P Marrelli, Yoonjung Park
Endoplasmic reticulum (ER) stress is closely associated with atherosclerosis, but the effects of exercise on ER stress-mediated endothelial dysfunction in atherosclerosis is not yet fully understood. We assessed endothelium-dependent vasodilation in isolated mesenteric arteries from wild type (WT), WT with exercise (WT-EX), ApoE knockout (ApoE KO), and ApoE KO mice with exercise (ApoE KO-EX). Vasodilation to acetylcholine (ACh) was elicited in the presence of inhibitors of ER stress, eNOS, caspase-1, and UCP-2 (Tudca, L-NAME, AC-YVARD-cmk, and Genipin, respectively) and the ER stress inducer (Tunicamycin)...
May 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29771821/the-effects-of-exercise-aspirin-and-celecoxib-in-an-atherogenic-environment
#2
Heather Grimm, Jan Kretzschmar, Marc D Cook, Michael D Brown
INTRODUCTION: Optimal vascular function is a hallmark of cardiovascular health. Specifically, the balance of vasoconstricting and vasodilating substances is recognized as a marker of vascular health. One of the greatest challenges to vascular health and vasodilatory balance is tumor necrosis factor alpha (TNFα) mediated inflammation. Uncovering effective strategies that maintain a vascular environment that is more vasodilatory and anti-thrombotic in the face of an inflammatory challenge is favorable...
April 30, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29756296/effect-of-obesity-on-oxygen-uptake-and-cardiovascular-dynamics-during-whole-body-and-leg-exercise-in-adult-males-and-females
#3
Simon Green, Eamon O'Connor, Catherine Kiely, Donal O'Shea, Mikel Egaña
Obesity has been associated with a slowing of V˙O2 dynamics in children and adolescents, but this problem has not been studied in adults. Cardiovascular mechanisms underlying this effect are not clear. In this study, 48 adults (18 males, 30 females) grouped according to body mass index (BMI) (lean < 25 kg·m-2 , overweight = 25-29.9 kg·m-2 , obese ≥30 kg·m-2 ) provided a fasting blood sample, completed a maximal graded exercise test and six bouts of submaximal exercise on a cycle ergometer, and performed two protocols of calf exercise...
May 2018: Physiological Reports
https://www.readbyqxmd.com/read/29748074/-altitude-and-the-right-heart
#4
REVIEW
R Naeije
INTRODUCTION: Altitude is associated with a decrease in partial pressure of oxygen. Hypoxia induces pulmonary vasoconstriction with subsequent fixed increase in pulmonary artery pressure, and eventual right heart failure. CURRENT KNOWLEDGE: High altitude exposure is associated with an increase in pulmonary artery pressure that is proportional to initial vasoconstriction. Echocardiographic evaluations on a large number of subjects show that the altitude-induced increase in pulmonary pressure is generally modest and does not exceed the 25mmHg that are diagnostic of pulmonary hypertension...
May 7, 2018: Revue des Maladies Respiratoires
https://www.readbyqxmd.com/read/29722620/elevated-extracellular-potassium-prior-to-muscle-contraction-reduces-onset-and-steady-state-exercise-hyperemia-in-humans
#5
Janée D Terwoord, Christopher M Hearon, Gary J Luckasen, Jennifer C Richards, Michael J Joyner, Frank A Dinenno
The increase in interstitial potassium (K+ ) during muscle contractions is thought to be a vasodilatory signal that contributes to exercise hyperemia. To determine the role of extracellular K+ in exercise hyperemia, we perfused skeletal muscle with K+ prior to contractions such that the effect of any endogenously-released K+ would be minimized. We tested the hypothesis that local, intra-arterial infusion of potassium chloride (KCl) at rest would impair vasodilation in response to subsequent rhythmic handgrip exercise in humans...
May 3, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29683391/grape-seed-extract-supplementation-attenuates-the-blood-pressure-response-to-exercise-in-prehypertensive-men
#6
Jong-Kyung Kim, Kyung-Ae Kim, Hyun-Min Choi, Seung-Kook Park, Charles L Stebbins
We tested the hypothesis that exaggerated pressor responses observed in prehypertensive males (N = 9) during dynamic exercise are attenuated following acute dietary supplementation with grape seed extract (GSE) (i.e., a single dose). Effects of placebo and GSE (300 mg) on systolic blood pressure, diastolic blood pressure, mean arterial pressure (MAP), cardiac output (CO), stroke volume (SV), total vascular conductance (TVC), and rate × pressure product (RPP) in response to two submaximal cycling workloads (40% and 60% VO2peak ) were compared 2 h after ingestion of GSE or placebo on different days, 1 week apart...
April 23, 2018: Journal of Medicinal Food
https://www.readbyqxmd.com/read/29629833/aerobic-exercise-training-differentially-affects-ace-c-and-n-domain-activities-in-humans-interactions-with-ace-i-d-polymorphism-and-association-with-vascular-reactivity
#7
Cléber Rene Alves, Tiago Fernandes, José Ribeiro Lemos, Flávio de Castro Magalhães, Ivani Credidio Trombetta, Guilherme Barreto Alves, Glória de Fátima Alves da Mota, Rodrigo Gonçalves Dias, Alexandre Costa Pereira, José Eduardo Krieger, Carlos Eduardo Negrão, Edilamar Menezes Oliveira
INTRODUCTION: Previous studies have linked angiotensin-converting enzyme ( ACE) insertion (I)/deletion (D) polymorphism (II, ID and DD) to physical performance. Moreover, ACE has two catalytic domains: NH2 (N) and COOH (C) with distinct functions, and their activity has been found to be modulated by ACE polymorphism. The aim of the present study is to investigate the effects of the interaction between aerobic exercise training (AET) and ACE I/D polymorphism on ACE N- and C-domain activities and vascular reactivity in humans...
April 2018: Journal of the Renin-angiotensin-aldosterone System: JRAAS
https://www.readbyqxmd.com/read/29621885/improvement-in-exercise-capacity-and-delayed-anaerobic-metabolism-induced-by-far-infrared-emitting-garments-in-active-healthy-subjects-a-pilot-study
#8
Valentina Mantegazza, Mauro Contini, Maurizia Botti, Ada Ferri, Francesca Dotti, Pierluigi Berardi, Piergiuseppe Agostoni
Background Far-infrared-emitting garments have several biological properties including the capability to increase blood perfusion in irradiated tissues. Design The aim of the study was to evaluate whether far-infrared radiation increases exercise capacity and delays anaerobic metabolism in healthy subjects. Methods With a double-blind, crossover protocol, a maximal cardiopulmonary exercise test was performed in 20 volunteers, wearing far-infrared or common sport clothes, identical in texture and colour. Results Comparing far-infrared with placebo garments, higher oxygen uptake at peak of exercise and longer endurance time were observed (peak oxygen uptake 38...
January 1, 2018: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/29615070/exercise-and-postprandial-lipemia-effects-on-vascular-health-in-inactive-adults
#9
Robinson Ramírez-Vélez, María Correa-Rodríguez, Alejandra Tordecilla-Sanders, Viviana Aya-Aldana, Mikel Izquierdo, Jorge Enrique Correa-Bautista, Cristian Álvarez, Antonio Garcia-Hermoso
BACKGROUND: There is evidence to suggest that postprandial lipemia are is linked to the impairment of endothelial function, which is characterized by an imbalance between the actions of vasodilators and vasoconstrictors. The aim of this study was to determine the effects of a 12-week high-intensity training (HIT) and moderate continuous training (MCT) protocol on postprandial lipemia, vascular function and arterial stiffness in inactive adults after high-fat meal (HFM) ingestion. METHODS: A randomized clinical trial was conducted in 20 healthy, inactive adults (31...
April 3, 2018: Lipids in Health and Disease
https://www.readbyqxmd.com/read/29607269/mycophenolate-mofetil-in-a-lupus-patient-with-pulmonary-hypertension
#10
Kirthi Machireddy, Zin Myint, Eric Dein, Stephen C Mathai, Philip Seo, Uzma Haque, Rebecca Manno, Homa Timlin
Pulmonary hypertension (PH) is a life-threatening complication of several, different connective tissue diseases, including systemic lupus erythematous (SLE), systemic sclerosis, and rheumatoid arthritis. PH can present early in SLE. The severity does not correlate with other organ disease activity or with disease duration. It is still debatable whether immunosuppressive therapy is useful for PH related to SLE or autoimmune connective tissue disease, as there are no large clinical trials. However, several case reports have shown improvement with cyclophosphamide and prednisone with or without vasodilator therapy...
January 29, 2018: Curēus
https://www.readbyqxmd.com/read/29605837/pathophysiology-of-noncardiac-syncope-in-athletes
#11
REVIEW
Georgios A Christou, Konstantinos A Christou, Dimitrios N Kiortsis
The most frequent cause of syncope in young athletes is noncardiac etiology. The mechanism of noncardiac syncope (NCS) in young athletes is neurally-mediated (reflex). NCS in athletes usually occurs either as orthostasis-induced, due to a gravity-mediated reduced venous return to the heart, or in the context of exercise. Exercise-related NCS typically occurs after the cessation of an exercise bout, while syncope occurring during exercise is highly indicative of the existence of a cardiac disorder. Postexercise NCS appears to result from hypotension due to impaired postexercise vasoconstriction, as well as from hypocapnia...
March 31, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29603743/inhibition-of-na-k-atpase-and-k-ir-channels-abolishes-hypoxic-hyperaemia-in-resting-but-not-contracting-skeletal-muscle-of-humans
#12
Matthew L Racine, Anne R Crecelius, Gary J Luckasen, Dennis G Larson, Frank A Dinenno
Exercise hyperaemia in hypoxia is augmented relative to the same exercise intensity in normoxia. During moderate-intensity handgrip exercise, endothelium-derived nitric oxide (NO) and vasodilating prostaglandins (PGs) contribute to ∼50% of the augmented forearm blood flow (FBF) response to hypoxic exercise (HypEx), but the mechanism(s) underlying the remaining response are unclear. We hypothesized that combined inhibition of NO, PGs, Na+ /K+ -ATPase, and inwardly rectifying potassium (KIR ) channels would abolish the augmented hyperaemic response in HypEx...
March 31, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29547935/effects-of-riot-control-training-on-systemic-microvascular-reactivity-and-capillary-density
#13
Flavio Pereira, Roger de Moraes, Diogo Van Bavel, Andrea De Lorenzo, Eduardo Tibirica
Introduction: The main aim of the present study is to evaluate the effects of strenuous exercise, related to special military training for riot control, on systemic microvascular endothelial function and skin capillary density. Materials and Methods: Endothelium-dependent microvascular reactivity was evaluated in the forearm skin of healthy military trainees (age 23.4 ± 2.3 yr; n = 15) using laser speckle contrast imaging coupled with cutaneous acetylcholine (ACh) iontophoresis and post-occlusive reactive hyperemia (PORH)...
March 14, 2018: Military Medicine
https://www.readbyqxmd.com/read/29540357/pulmonary-arterial-hypertension-pathogenesis-and-clinical-management
#14
REVIEW
Thenappan Thenappan, Mark L Ormiston, John J Ryan, Stephen L Archer
Pulmonary hypertension is defined as a resting mean pulmonary artery pressure of 25 mm Hg or above. This review deals with pulmonary arterial hypertension (PAH), a type of pulmonary hypertension that primarily affects the pulmonary vasculature. In PAH, the pulmonary vasculature is dynamically obstructed by vasoconstriction, structurally obstructed by adverse vascular remodeling, and pathologically non-compliant as a result of vascular fibrosis and stiffening. Many cell types are abnormal in PAH, including vascular cells (endothelial cells, smooth muscle cells, and fibroblasts) and inflammatory cells...
March 14, 2018: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/29519339/trials-and-tribulations-of-assessing-new-imaging-protocols-combining-vasodilator-stress-with-exercise
#15
REVIEW
Carlos D Davila, James E Udelson
Among all patients referred for stress myocardial perfusion imaging (MPI), a substantial proportion in contemporary practice cannot exercise. Another group of patients are those who are thought to be able to achieve an adequate workload with treadmill (or bicycle) exercise but do not achieve at least 85% of maximum predicted heart rate without developing symptoms. There has been substantial interest and literature on the adjunctive use of vasodilator stress during the same visit to generate best-quality results for patients who do not exercise adequately...
March 2018: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29461891/pathophysiology-of-chronic-systolic-heart-failure-a-view-from-the-periphery
#16
Stuart D Katz
Heart failure is a common form of heart disease associated with progressive exercise intolerance and high risk of adverse clinical outcome events. The pathophysiology of chronic systolic heart failure is fundamentally determined by the failure of the circulatory system to deliver oxygen sufficient for metabolic needs, and it is best explained by a complex interplay between intrinsic abnormalities of ventricular pump function and extracardiac factors that limit oxygen use in metabolically active tissues. This brief review highlights the role of extracardiac factors (peripheral factors) that may impact exercise capacity in patients with chronic systolic heart failure...
February 2018: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/29444520/remodeling-of-wall-mechanics-and-the-myogenic-mechanism-of-rat-intramural-coronary-arterioles-in-response-to-a-short-term-daily-exercise-program-role-of-endothelial-factors
#17
Mária Szekeres, György L Nádasy, Gabriella Dörnyei, Annamária Szénási, Akos Koller
PURPOSE: Exercise elicits early adaptation of coronary vessels enabling the coronary circulation to respond adequately to higher flow demands. We hypothesized that short-term daily exercise induces biomechanical and functional remodeling of the coronary resistance arteries related to pressure. METHODS: Male rats were subjected to a progressively increasing 4-week treadmill exercise program (over 60 min/day, 1 mph in the final step). In vitro pressure-diameter measurements were performed on coronary segments (119 ± 5 μm in diameter at 50 mm Hg) with microarteriography...
February 14, 2018: Journal of Vascular Research
https://www.readbyqxmd.com/read/29389247/greater-fluid-loss-does-not-fully-explain-the-divergent-hemodynamic-balance-mediating-post-exercise-hypotension-in-endurance-trained-men
#18
Robert D Meade, Craig G Crandall, Daniel Gagnon, Glen P Kenny
Following exercise, mean arterial pressure (MAP) is reduced ~5-10 mmHg from pre-exercise baseline. In non-endurance-trained males, post-exercise hypotension results from peripheral vasodilation not offset by increased cardiac output (CO). By contrast, post-exercise hypotension occurs through a reduction in CO from pre-exercise baseline in endurance-trained males. The reason(s) explaining these divergent responses remain unknown. Exercise at fixed percentage of peak oxygen consumption (VO2peak ) is associated with a greater rate of metabolic heat production in trained individuals and therefore elevated sweat rates, both when compared to untrained individuals...
February 1, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29388467/emerging-therapeutics-in-pulmonary-hypertension
#19
Matthew K Hensley, Andrea Levine, Mark T Gladwin, Yen-Chun Lai
Pulmonary hypertension (PH) is a progressive and often fatal illness presenting with nonspecific symptoms of dyspnea, lower extremity edema, and exercise intolerance. Pathologically, endothelial dysfunction leads to abnormal intimal and smooth muscle proliferation along with reduced apoptosis, resulting in increased pulmonary vascular resistance (PVR) and elevated pulmonary pressures. PH is subdivided into five WHO groups based on the disease pathology and specific cause. While there are FDA-approved medications for the treatment of pulmonary arterial hypertension (PAH, Group 1 PH), as well as for chronic thromboembolic pulmonary hypertension (CTEPH, Group 4 PH), the morbidity and mortality remain high...
February 1, 2018: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29380952/acute-ingestion-of-dietary-nitrate-increases-muscle-blood-flow-via-local-vasodilation-during-handgrip-exercise-in-young-adults
#20
Jennifer C Richards, Matthew L Racine, Christopher M Hearon, Megan Kunkel, Gary J Luckasen, Dennis G Larson, Jason D Allen, Frank A Dinenno
Dietary nitrate (NO3-) is converted to nitrite (NO2-) and can be further reduced to the vasodilator nitric oxide (NO) amid a low O2 environment. Accordingly, dietary NO3- increases hind limb blood flow in rats during treadmill exercise; however, the evidence of such an effect in humans is unclear. We tested the hypothesis that acute dietary NO3- (via beetroot [BR] juice) increases forearm blood flow (FBF) via local vasodilation during handgrip exercise in young adults (n = 11; 25 ± 2 years). FBF (Doppler ultrasound) and blood pressure (Finapres) were measured at rest and during graded handgrip exercise at 5%, 15%, and 25% maximal voluntary contraction (MVC) lasting 4 min each...
January 2018: Physiological Reports
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