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Results 201 - 250 of 1439
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Cahalin Lawrence P - - 2013
BACKGROUND: Heart rate recovery (HRR) has been observed to be a significant prognostic measure in patients with heart failure (HF). However, the prognostic value of HRR has not been examined in regard to the level of patient effort during exercise testing. Using the peak respiratory exchange ratio (RER) and a ...
Neves Barbara C das - - 2013
We have studied the cardiac chronotropic responses to the Valsalva maneuver and to dynamic exercise of twenty chronic chagasic patients with normal left ventricular function and no segmental wall abnormalities by two-dimensional echocardiogram. The absolute increase in heart rate of the patients (Δ = 21.5 ± 10 bpm, M±SD) during ...
Myers Jonathan - - 2013
An impaired cardiac output response to exercise is a hallmark of chronic heart failure (HF). We determined the extent to which noninvasive estimates of cardiac hemodynamics during exercise in combination with cardiopulmonary exercise test (CPX) responses improved the estimation of risk for adverse events in patients with HF. CPX and ...
Piepoli M F - - 2013
Decreased exercise capacity negatively affects the individuals' ability to adequately perform activities required for normal daily life and, therefore, the independence and quality of life. Regular exercise training is associated with improved quality of life and survival in healthy individuals and in cardiovascular disease patients. Also in patients with stable ...
Dupuy Olivier - - 2013
The purpose of this study was to evaluate the effect of a 2-week overload period immediately followed by a 1-week taper period on the autonomic control of heart rate during the night or after exercise cessation. Eleven male endurance athletes increased their usual training volume by 100% for 2 weeks ...
Freeman Michelle L ML Department of Pulmonary Medicine, Mayo Clinic, Jacksonville, Florida, USA. - - 2013
Noninvasive assessment of right heart function and hemodynamics in patients with pulmonary arterial hypertension (PAH) is most often performed at rest, whereas the symptoms, in general, present with exertion. Assessment during exertion is limited to symptom assessment and the 6-minute walk distance. We investigated the feasibility of obtaining echocardiographic data ...
Carneiro-Júnior Miguel Araujo - - 2013
The aim of the present study was to verify the effects of low-intensity endurance training and detraining on the mechanical and molecular properties of cardiomyocytes from spontaneously hypertensive rats (SHRs). Male SHRs and normotensive control Wistar rats at 16-weeks of age were randomly divided into eight groups of eight animals: ...
Wilhelm Matthias - - 2013
There is a growing population of veteran endurance athletes, regularly participating in training and competition. Although the graded benefit of exercise on cardiovascular health and mortality is well established, recent studies have raised concern that prolonged and strenuous endurance exercise may predispose to atrial and ventricular arrhythmias. Atrial fibrillation (AF) ...
Yilmaz Ahmet - - 2013
BACKGROUND: Heart rate decrease after exercise, that is associated with reactivation of parasympathetic system, is important, as it is also associated with mortality. Previous studies have shown that this is an independent mortality predictor in patients having no coronary artery disease and having normal left ventricular function. In our study, ...
Naeije Robert R Department of Pathophysiology, Erasme Campus of the Univerrsité Libre de Bruxelles, 808 Lennik Road, Brussels, Belgium. - - 2013
Exercise stresses the pulmonary circulation through increases in cardiac output (.Q) and left atrial pressure. Invasive as well as noninvasive studies in healthy volunteers show that the slope of mean pulmonary artery pressure (mPAP)-flow relationships ranges from 0.5 to 3 mm Hg.min.L(-1). The upper limit of normal mPAP at exercise ...
Okita Koichi - - 2013
Chronic heart failure (CHF) is characterized as a clinical disorder displaying exercise intolerance; patients typically complain of early muscular fatigue. Previously, it was thought to be simply a failure of perfusion to the exercising musculature and consequent early onset of intramuscular acidosis in CHF. However, improved hemodynamics by cardiotonic agents ...
Cahalin Lawrence P - - 2013
BackgroundHeart rate recovery (HRR) is becoming an important prognostic maker in heart failure (HF), but very little is known about the underlying mechanisms responsible for its clinical efficacy. Therefore, we examined echocardiographic and exercise (submaximal and maximal) characteristics to gain a better appreciation of HRR and factors responsible for the ...
McIntosh Robert A - - 2013
BACKGROUND: Resting echocardiographic measures of cardiac function such as left ventricular ejection fraction correlate poorly with exercise capacity. Assessment during exercise using measures less dependent on hemodynamic loading conditions, such as tissue Doppler imaging (TDI), may more accurately characterize the relationship between cardiac function and exercise capacity. METHODS AND RESULTS: ...
Lee Phong T PT Centre for Cardiovascular Science, University of Edinburgh, Edinburgh, United - - 2013
To use cardiovascular magnetic resonance to investigate left ventricular wall thickness and the presence of asymmetrical hypertrophy in young army recruits before and after a period of intense exercise training. Using cardiovascular magnetic resonance, the left ventricular wall thickness was measured in all 17 segments and a normal range was ...
Vitarelli Antonio - - 2013
AIMS: Previous studies have shown distinct models of cardiac adaptations to the training in master athletes and different effects of endurance and strength-training on cardiovascular function. We attempted to assess left-ventricular (LV) function, aortic (Ao) function, and right-ventricular (RV) function in athletes with different forms of training by using three-dimensional ...
Kim Jisu - - 2013
Silk peptides (SP) have been reported to decrease body weight and accumulate fat. We investigated the effects of SP administration by using an open circuit calorimetry system on resting energy expenditure and substrate utilization in resting mice for the duration of 24 h. Seven-week-old male ICR-mice were orally administered SP ...
Dor-Haim Horesh - - 2013
The mechanisms whereby aerobic training reduces the occurrence of sudden cardiac death in humans are not clear. We test the hypothesis that exercise-induced increased resistance to ventricular tachycardia and fibrillation (VT/VF) involve an intrinsic remodeling in healthy hearts. Thirty rats were divided into a sedentary (CTRL, nā€Š=ā€Š16) and two exercise ...
Risom Signe Stelling - - 2013
Atrial fibrillation affects almost 2% of the population in the Western world. To preserve sinus rhythm, ablation is undertaken in symptomatic patients. Observational studies show that patients with atrial fibrillation often report a low quality of life and are less prone to be physically active due to fear of triggering ...
Scharhag Jürgen J Department of Internal Medicine III: Cardiology, Angiology and Pneumology, Heidelberg University Hospital, Heidelberg, Germany. - - 2013
Controversy surrounds the cardiac effects of competitive sports and the athlete's heart. In this review, we present and discuss the main cardiological findings in competitive athletes. Selective review of pertinent literature retrieved by a search with the keywords "athlete's heart," "ECG," "echocardiography," "endurance exercise," "longevity," and others. Regular exercise leads ...
Snoek Johan A JA Sports Medicine Department, Isala, Zwolle, The - - 2013
Although a delayed decrease in heart rate during the first minute after graded exercise has been identified as a powerful predictor of overall mortality in cardiac patients, the potential to influence this risk factor by aerobic training remains to be proven. The aim was to study the relationship between aerobic ...
Kwak Hyo-Bum HB Department of Kinesiology, Inha University, Incheon, - - 2013
Aging is characterized by a progressive impairment of (a) cardiac structure including fibrosis and cardiomyocyte density, and (b) cardiac function including stroke volume, ejection fraction, and cardiac output. The cardiac remodeling involves loss of cardiac myocytes, reactive hypertrophy of the remaining cells, and increased extracellular matrix (ECM) and fibrosis in ...
Sadeghi Masoumeh M Cardiac Rehabilitation Research Center, Isfahan Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan 81465-1148, - - 2013
Introduction. The accurate impact of exercise on coronary artery disease (CAD) patients with left ventricular dysfunction is still debatable. We studied the effects of cardiac rehabilitation (CR) on echocardiography parameters in CAD patients with ventricular dysfunction. Methods. Patients with CAD who had ventricular dysfunction were included into an exercise-based rehabilitation ...
Banga Sandeep S Frederik Meijer Heart & Vascular Institute, Michigan, - - 2013
Ventricular arrhythmias in young people most commonly occur due to the presence of hypertrophic cardiomyopathy, long QT syndrome or Wolff-Parkinson-White syndrome. We present a case in which the patient had exercise induced syncopal spells and was found to have ventricular tachycardia (VT) during both exercise stress testing and an electrophysiology ...
Singh Anvesha A Department of Cardiovascular Sciences, University of Leicester, Glenfield Hospital, Leicester, UK and NIHR Leicester Cardiovascular Biomedical Research Unit, Glenfield Hospital, Leicester, - - 2013
Aortic stenosis (AS) is the commonest valve disorder in the developed world requiring surgery. Surgery in patients with severe asymptomatic AS remains controversial. Exercise testing can identify asymptomatic patients at increased risk of death and symptom development, but with limited specificity, especially in older adults. Cardiac MRI (CMR), including myocardial ...
Brønstad Eivind - - 2012
Abstract Objective: The aim of this study was to investigate the effects of moderate continuous training (MCT) and high intensity aerobic interval training (AIT) on systolic ventricular function and aerobic capacity in COPD patients. Methods: Seventeen patients with COPD (64 ± 8 years, 12 men) with FEV(1) of 52.8 ± 11% ...
Buckner Kern - - 2013
Cardiac dyspnea, especially if present only with exercise, is often confused with asthma and exercise-induced bronchospasm. Cardiac dyspnea or asthma is the consequence of pulmonary edema due to pulmonary venous hypertension and not due to asthmatic bronchoconstriction. In overt, acute congestive heart failure, the diagnosis may be readily made by ...
Passaglia Daniela Guinther - - 2012
BACKGROUND: The consequences and risks of prolonged physical exercise are not well established. OBJECTIVE: To evaluate the effects of prolonged physical exercise on the participants of a 24-hour ultramarathon race. METHODS: Twenty male runners were selected for evaluation a day before and immediately after the race, where the athletes had ...
Oliveira-Carvalho Vagner - - 2012
MicroRNAs (miRNAs) are a class of non-coding small RNAs representing one of the most exciting areas of modern medical science. miRNAs modulate a large and complex regulatory network of gene expression of the majority of the protein-coding genes. Currently, evidences suggest that miRNAs play a crucial role in the pathogenesis ...
Klasnja Aleksandar V - - 2013
Cardiac power output (CPO) is an integrative measure of overall cardiac function as it accounts for both, flow- and pressure-generating capacities of the heart. The purpose of the present study was twofold: (i) to assess cardiac power output and its response to exercise in athletes and non-athletes and (ii) to ...
Tan Yu Ting - - 2012
BACKGROUND: Left ventricular (LV) systole and diastole are intimately dependent on myocardial torsion, which involves coupling between myocardial rotation (twisting in systole and untwisting in diastole) and longitudinal motion. Heart failure with normal ejection fraction (HFNEF) is known to involve exercise-induced wall motion abnormalities, but torsion on exercise has not ...
Steriotis Alexandros Klavdios AK Department of Cardiac, Thoracic and Vascular Sciences, University of Padua, Padua, Italy. - - 2013
The aim of this study was to analyze using noninvasive cardiac examinations a series of young athletes discovered to have ventricular arrhythmias (VAs) during the preparticipation screening program for competitive sports. One hundred forty-five athletes (mean age 17 ± 5 years) were evaluated. The study protocol included electrocardiography (ECG), exercise ...
Kemi Ole Johan - - 2012
ABSTRACT Objectives: To investigate the mechanisms of losartan- and exercise training-induced improvements on endothelial dysfunction in heart failure. Design: Sprague-Dawley rats subjected to left coronary artery ligation inducing myocardial infarction and heart failure were randomized to losartan treatment, high-intensity exercise training, or both. Results: Losartan, but not exercise training, reduced ...
Norman Joseph F - - 2012
The purpose of this study was to compare an Exercise Training Group (EX) with an Attention-Control Group (AT-C) to more specifically assess the impact of exercise training on individuals with heart failure (HF). Forty-two individuals with HF were randomized to AT-C or EX that met with the same frequency and ...
Giacomantonio Nicholas B - - 2012
BACKGROUND: This systematic review sought to evaluate critically the health benefits of physical activity among persons with atrial fibrillation (AF). AF is increasing in Western society. While health benefits of physical activity are well established, benefits of physical activity among individuals with AF are not clearly identified. METHODS: Literature was ...
Rustad Lene A - - 2012
Background: Heart transplant recipients have lower exercise capacity and impaired cardiac function compared with the normal population. High-intensity interval training (HIIT) improves exercise capacity and cardiac function in patients with heart failure and hypertension, but the effect on cardiac function in stable heart transplant recipients is not known. Thus, we ...
Henein Michael - - 2012
OBJECTIVES: Heart failure (HF) patients with preserved left ventricular (LV) ejection fraction (EF) (HFpEF) due to systemic hypertension (SHT) are known to have limited exercise tolerance. Despite having normal EF at rest, we hypothesize that these patients have abnormal systolic function reserve limiting their exercise capacity. METHODS: Seventeen patients with ...
Pagourelias Efstathios D - - 2012
Left ventricular hypertrophy (LVH) with intraventricular septum thickness (IVST) between 1.2 and 1.5 cm in athletes represents a "gray zone" between physiologic adaptation and mild hypertrophic cardiomyopathy (HCM). Various echo and laboratory parameters have been reported till now in the literature to discriminate the "gray zone" entities. Aim of this study ...
Takaya Yoichi - - 2012
Background: Although it has been demonstrated that cardiac remodeling and exercise capacity improve after transcatheter closure of atrial septal defect (ASD), little is known about long-term benefits in middle-aged and elderly patients with a reduction in cardiopulmonary function. Objectives: To evaluate long-term extent and time course of improvements in cardiac ...
Cordina Rachael L - - 2012
BACKGROUND: Subjects with Fontan-type circulation have no sub-pulmonary ventricle and thus depend exquisitely on the respiratory bellows and peripheral muscle pump for cardiac filling. We hypothesised that resistance training to augment the peripheral muscle pump might improve cardiac filling, reduce inspiratory-dependence of IVC return to the heart and thus improve ...
Osbak Philip Samuel PS Department of Cardiology, Hvidovre Hospital, Faculty of Health Sciences, University of Copenhagen, Hvidovre, Denmark. - - 2012
Atrial fibrillation diminishes cardiac function, exercise tolerance and quality of life. The objective of this study was to determine whether exercise training in atrial fibrillation affects muscle strength, body composition, maximal exercise capacity and walking capacity positively, thus improving quality of life. Randomized clinical trial. Twelve weeks of physical exercise ...
Nishio Ryo - - 2012
: Although pulmonary arterial hypertension (PAH) and chronic heart failure (CHF) lead to exercise limitation, their pathophysiology is different. Our objective was to evaluate, using right heart catheterization and cardiopulmonary exercise testing, the difference in hemodynamic parameters and exercise capacity between PAH and CHF, which have the same subjective symptoms. ...
Heidbuchel Hein - - 2012
Athletic performance tests the limits of the human body and mind. Awe-inspiring achievements is what makes sports so fascinating. It is well appreciated however that top-level sports may sometimes overtax the body, and can lead to injuries, most notably of musculo-skeletal nature. This paper defends the thesis that the heart ...
Lockie Timothy P E - - 2012
BACKGROUND: The mechanisms of reduced angina on second exertion in patients with coronary arterial disease, also known as the warm-up angina phenomenon, are poorly understood. Adaptations within the coronary and systemic circulations have been suggested but never demonstrated in vivo. In this study we measured central and coronary hemodynamics during ...
O'Byrne Michael L - - 2012
Cardiopulmonary exercise testing (CPET), particularly maximal oxygen consumption (VO(2)max), has been used to assess the outcome for patients with palliated congenital heart disease (CHD). Small studies correlating VO(2)max with noninvasive imaging measures of ventricular function have led to the hypothesis that VO(2)max reflects cardiac performance. In other settings, physical training ...
Pan Lei - - 2012
AimWhether Tai Chi (TC) is effective in the cardiac rehabilitation of patients with chronic heart failure (CHF) remains controversial. We performed a meta-analysis to examine the effects of TC on exercise capacity and quality of life (QoL) in CHF patients. METHODS AND RESULTS: PubMed and EMBASE databases were searched (up ...
Marshall Kurt D KD Department of Biomedical Science, University of Missouri-Columbia, Columbia, Missouri 65211, - - 2013
We have previously reported chronic low-intensity interval exercise training attenuates fibrosis, impaired cardiac mitochondrial function, and coronary vascular dysfunction in miniature swine with left ventricular (LV) hypertrophy (Emter CA, Baines CP. Am J Physiol Heart Circ Physiol 299: H1348-H1356, 2010; Emter CA, et al. Am J Physiol Heart Circ Physiol ...
Corotto Paul S - - 2013
The American Heart Association has identified adherence as an integral component of heart failure self-care. Unfortunately, adherence to medication, diet, and exercise regimens historically has been poor. This review discusses relevant literature related to poor adherence in several therapeutic domains, including factors contributing to poor adherence, interventions designed to improve ...
Gayda Mathieu - - 2012
The aim of this study was to compare the acute hemodynamic responses during high-intensity intermittent exercise (HIIE) session compared with moderate-intensity continuous exercise (MICE) session in patients with heart failure and reduced ejection fraction (HFREF). Thirteen patients with HFREF (age, 59 ± 6 years; left ventricular ejection fraction, 27% ± ...
Alves A J - - 2012
β1-adrenergic receptors (ADRB1) and Gαs proteins (GNAS) play important roles in the regulation of cardiac function. The present study sought to investigate whether ADRB1 Arg389Gly (rs1801253), GNAS -1211 G/A (rs6123837) and GNAS 2291 C/T (rs6026584) variants are associated with left ventricular function and exercise tolerance in heart failure patients. 61 ...
Zizola Cynthia - - 2012
Physiologic endurance exercise performance is primarily limited by cardiac function. In patients with heart failure, there is dissociation between cardiac performance and exercise capacity, suggesting a distinct role of abnormal peripheral organ function, including skeletal muscle function. The impact of heart failure upon skeletal muscle and exercise performance will be ...
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