Search Results
Results 301 - 350 of 830
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Dujić Zeljko - - 2006
PURPOSE: A similar postexercise hypotension (PEH) has been reported in sedentary and mildly endurance-trained individuals of both sexes after a single dynamic submaximal exercise. In endurance-trained men, the hypotension was associated with a reduction of cardiac output, whereas the peripheral vasodilatation was the main mechanism of this fall in other ...
Haga, Shukoh
HAGA, S., ESAKI, K., TOSHINAI, K., KINUGASA, T., TAKEMASA, T., UEYA, E., HAMAOKA, T., KATSUMURA, T., KIZAKI, t. and OHNO, H., Cardiac Output and Stroke Volume at Anaerobic Threshold During Walking Exercise in Healthy Aged Subjects. Abv. Exerc. Sports Physiol., Vol.9, No.1 pp.37-43, 2003. There have been few previous studies ...
Middleton Natalie - - 2006
The present study employed novel echocardiographic tools and cardiac markers to obtain a greater understanding of the aetiology and time course of altered cardiac function and cardiac damage following prolonged exercise and, in particular, the possible role of transient ischaemia within these phenomena. Fourteen runners in the 2004 London Marathon ...
Hydock D S - - 2006
PURPOSE: This study examined the effects of an 8-week androgen deprivation therapy treatment using Zoladex and an endurance training regimen on cardiac function. METHODS: Male Sprague-Dawley rats received either Zoladex or placebo. Animals remained sedentary or endurance trained during the drug treatment period. On day 57, ex vivo cardiac function ...
Atkinson Greg - - 2006
Although regular physical activity is beneficial for many clinical conditions, an acute bout of exercise might increase the risk of an adverse clinical event, such as sudden cardiac death or myocardial infarction, particularly in vulnerable individuals. Since it is also known that the incidence of these events peaks in the ...
Baum M M - - 2006
The mass spectrometer (MS) traditionally has been the instrument of choice for measuring cardiac output (Q (T)) non-invasively using the foreign gas uptake method. However, the size and cost of the MS has hampered widespread adoption of this technique outside of the laboratory. Here, we present results, from six normal ...
Vella C A - - 2005
AIM: The purpose of this study was to examine the relationships between the central cardiovascular variables (cardiac output, stroke volume and heart rate) and oxygen uptake (VO2) during continuous, incremental cycle exercise to maximal aerobic capacity (VO2max). METHODS: Twenty-one moderately to highly trained males (n=19) and females (n=2) participated in ...
Alonso-Fernández Alberto - - 2006
AIMS: To evaluate cardiac response to exercise in middle-aged normotensive obstructive sleep apnoea-hypoapnoea syndrome (OSAHS) adults with normal resting left ventricular systolic function and to test the hypothesis that nasal continuous positive airway pressure (CPAP) therapy might improve cardiac performance during exercise. METHODS AND RESULTS: We performed a prospective, randomized, ...
Rowland Thomas - - 2005
OBJECTIVE: To determine the magnitude of the effects of pectus excavatum deformity on endurance fitness and cardiorespiratory functional reserve in adolescent boys. DESIGN: Cross-sectional comparison of cardiac and ventilatory variables at rest and during a maximal cycle exercise test. SETTING: Pediatric exercise-testing laboratory. PARTICIPANTS: Twelve boys (mean +/- SD age, ...
Williams Simon G - - 2005
Cardiac power output (CPO), the product of cardiac output (CO) and mean arterial pressure (MAP), is a direct measure of cardiac pumping capability and is strongly indicative of prognosis and exercise ability in patients with chronic heart failure (CHF). However, it is not as easily measured as indirect indicators of ...
Castillo-Moreno Juan A JA Servicio de Cardiología, Hospital Santa María del Rosell, Cartagena, Murcia, - - 2005
The ability of stress echocardiography to provide prognostic information that supplements that obtainable from clinical data and exercise electrocardiography is still controversial. Our aim was to determine whether dobutamine stress echocardiography provides additional information on long-term prognosis after conventional exercise testing has indicated that a patient with chronic stable angina ...
Snyder Eric M - - 2005
To avoid limitations associated with the use of single-breath and rebreathe methods for assessing the lung diffusing capacity for carbon monoxide (D(L)CO) during exercise, we developed an open-circuit technique. This method does not require rebreathing or alterations in breathing pattern and can be performed with little cognition on the part ...
Lindenfeld JoAnn - - 2005
Previous studies have concluded that polycythemia decreases oxygen delivery primarily because of a large fall in cardiac output associated with a rise in systemic vascular resistance that has been attributed to increased blood viscosity. However, because other studies have shown that polycythemia may not reduce oxygen delivery, an alternative hypothesis ...
Cooke Steven J - - 2005
In this study, the cardiovascular response to exhaustive exercise among differentiated stocks of largemouth bass Micropterus salmoides was compared at 10 degrees C and 20 degrees C to assess the level of their local adaptation. In addition, the impact that interstock hybridization had on adaptive differences was assessed using F1 ...
Dibski D W - - 2005
Comparison and reliability of two non-invasive acetylene uptake techniques for the measurement of cardiac output. Thirteen trained male cyclists performed CO2 rebreathing (CO2RB) at intensities from rest to 200 W, and open-circuit acetylene uptake (OpCirc) and single-breath acetylene uptake (SB) at intensities from rest to 300 W, with all procedures ...
Sláma Karel - - 2005
Pulsations of the dorsal vessel were recorded in vivo during the whole postembryonic development of D. melanogaster, by means of a newly invented, pulse-light opto-cardiographic method. The young larvae of the 1st and 2nd instars submerged in the feeding medium exhibited extremely high rates of heartbeat, 7Hz at room temperature. ...
Mayosi B M - - 2006
To verify whether a deficiency in the cardiac sarcoplasmic reticulum pump SERCA2a causes cardiac dysfunction in humans. Cardiac performance was measured in a serendipitous human model of primary SERCA2a deficiency, Darier's disease, an autosomal dominant skin disorder caused by mutations inactivating one copy of the ATP2A2 gene, which encodes SERCA2a. ...
Measday Megan A - - 2005
Accurate anticoagulation monitoring, critical during cardiac surgery (CS), is especially important for novel therapeutics such as hirudins, for which there are no known antidotes. The activated clotting time (ACT), which is standard for heparin monitoring, has been reported to be insufficiently sensitive to high levels of hirudins. A simple, accurate, ...
Scherhag A - - 2005
BACKGROUND: Non-invasive evaluation of haemodynamic variables remains a preferable and attractive option in both pharmacologic research and clinical cardiology. OBJECTIVES: The objective of this study was to evaluate the correlation, feasibility and diagnostic value of haemodynamic measurements by ICG with the thermodilution (TD) method at rest and during exercise testing. ...
Krediet C T Paul - - 2005
A 27-year old female had one episode of transient loss of consciousness and several of near-unconsciousness during strenuous exercise and sexual activity. Episodes started with abdominal discomfort or nausea and light headedness. Unconsciousness never exceeded one minute. When trying to stand up, she felt she would lose consciousness again. We ...
Wolff Chris B - - 2005
Circulation time (Ct) between lung and periphery may be a surrogate for cardiac output, estimated here, for the most part, as the time between taking a breath of nitrogen and peripheral detection of a desaturation pulse. Use of pulse oximetry involves an internal, instrument delay; however, using the ear, we ...
Bassez G - - 2004
Cardiac tachyarrhythmias have rarely been studied in young patients with myotonic dystrophy type 1 (DM1). The authors observed major cardiac rhythm disturbances in 11 patients aged 10 to 18 years. Tachyarrhythmic events were more frequent than impulse conduction disorders. Wide variations in CTG expansion were observed among the population. Since ...
Spaak Jonas - - 2005
Long-term head-down-tilt bed rest (HDT) causes cardiovascular deconditioning, attributed to reflex dysfunctions, plasma volume reduction, or cardiac impairments. Our objective with the present study was to evaluate the functional importance and relative contribution of these during rest and exercise in supine and upright postures. We studied six subjects before (baseline), ...
Cava Joseph R - - 2004
This article reviews the risk factors that are associated with exercise that can lead to sudden cardiac death and what can be done to identify those who are at risk. Additionally, exercise recommendations to reduce the chance of sudden cardiac death and comments about restrictions and quality of life issues ...
Krep Henning - - 2004
OBJECTIVE: To evaluate the effects of hypertonic, isooncotic, and isotonic infusion therapy on cerebral blood flow (CBF) during and after cardiopulmonary resuscitation (CPR) from experimental cardiac arrest (CA). METHODS: In 32 domestic swine (13-23 kg) open chest CPR was initiated after 8 min of ventricular fibrillation. With the onset of ...
Cybulski Gerard - - 2004
Impedance cardiography (ICG) enables the non-invasive, reproducible, beat-to-beat estimation of stroke volume (SV) changes, and the measurement of the absolute values of the ejection time (ET) and pre-ejection period (PEP), which allows the indirect evaluation of cardiac contractility. The miniaturised, Holter-type impedance cardiography device with built-in one channel of ECG ...
Plachky Jens - - 2004
Neurological complications contribute significantly to morbidity and mortality of patients after orthotopic liver transplantation (OLT). One possible cause of postoperative neurological complications is cerebral ischemia during the surgical procedure. In this study, we investigated the relationship between intraoperative changes in regional cerebral oxygen saturation (rSo(2)) and postoperative values of neuron-specific ...
Hitosugi Masahito - - 2004
To clarify the relationship of the intensity of acute exercise to sudden cardiac death, we examined the effects of short-term heavy and light exercise on whole blood viscosity. Nine healthy sedentary male volunteers performed ten minutes of heavy (more than 95% of maximum oxygen consumption) or light (60% to 65% ...
Joaquim Natércia - - 2004
Using Transonic flow probes and a uniquely designed swimming flume, we directly measured cardiac parameters (Q, cardiac output; SV, stroke volume; and fH, heart rate) in winter flounder (Pleuronectes americanus) before and during critical swim speed (Ucrit) tests at 4 and 10 degrees C. Resting Q, SV and fH averaged ...
Lietava Jan - - 2004
BACKGROUND: Owing to excessive worries regarding adverse cardiac events, hyperthermal balneotherapy for patients with coronary artery disease is underprescribed. However, very few cardiac events occur in similar heat stress during Finnish sauna bathing. Exercise testing has proven to be a safe diagnostic procedure even in survivors of myocardial infarction. METHODS: ...
Diffee Gary M - - 2004
Recent work suggests that chronic exercise induces alterations in the contractile properties of cardiac myocytes. These alterations include increased sensitivity to activation by Ca, changes in the force-length relationship, and increased power output. A recently observed shift in expression of myosin light chain 1 subunit isoforms induced by training may ...
Pianosi Paul T - - 2004
The purpose of this study was to track changes in stroke volume during exercise by impedance cardiography in order to validate the method, and to obtain such data in a large number of healthy children for reference purposes. One hundred and fifteen healthy children (aged 7-19 years) performed progressive exercise ...
Michaud Katarzyna - - 2004
A case of sudden death following exercise testing in a 33-year-old man is reported. The forensic autopsy showed atherosclerotic stenosis of the left coronary artery, as well as some changes in the cardiac conduction system, including anomalies of the atrioventricular node and moderate fibrosis and fatty infiltration of the branching ...
Riedlbauchova Lucie - - 2004
Acute hemodynamic studies suggest that resynchronization therapy using single-site left ventricular pacing (LVP) is equivalent to biventricular pacing (BIVP). The aim of this study was to assess the performance of LVP versus BIVP during exercise by means of stress echocardiography. A total of 28 patients (25 men and 3 women, ...
Deligiannis A - - 2004
Patients with chronic renal failure (CRF) on hemodialysis (HD) are at increased risk of cardiovascular disease. This is due, mainly, to a higher prevalence of established arteriosclerotic risk factors, including diabetes mellitus, hypertension, dyslipidemia, physical inactivity, as well as to unique CRF-related risk factors. Accordingly, cardiorespiratory insufficiency, left ventricle dysfunction, ...
Tam Enrico - - 2004
The beat-by-beat non-invasive assessment of cardiac output (Q litre x min(-1)) based on the arterial pulse pressure analysis called Modelflow can be a very useful tool for quantifying the cardiovascular adjustments occurring in exercising humans. Q was measured in nine young subjects at rest and during steady-state cycling exercise performed ...
Pitt Marjorie S - - 2004
Portapres derives continuous estimates of cardiac output from the peripheral pulse and has the potential to be an extremely valuable physiological and clinical tool. We assessed Portapres estimates of cardiac output in healthy subjects at rest, during maximal treadmill exercise ( n = 8) and during decreases caused by orthostatic ...
Matsukawa K - - 2004
To investigate whether the Model-flow method, by simulating the aortic input impedance model from a noninvasive monitoring of arterial blood pressure, reflected a reliable measure of cardiac output (CO) during postural change and whole-body exercise occurring in daily life, we compared the Modelflow-estimated CO with a simultaneous reference determined by ...
Silber Jeffrey H - - 2004
PURPOSE: To determine whether an angiotensin-converting enzyme (ACE) inhibitor, enalapril, prevents cardiac function deterioration (defined using maximal cardiac index [MCI] on exercise testing or increase in left ventricular end-systolic wall stress [LVESWS]) in long-term survivors of pediatric cancer. PATIENTS AND METHODS: This was a randomized, double-blind, controlled clinical trial comparing ...
Ono Takashi - - 2004
The purpose of this study was to assess the validity of an adaptive filter, the scaled Fourier linear combiner (SFLC), in the impedance cardiography (ICG). Eight healthy males underwent constant-load bicycle exercise at different intensities from unloaded to near maximal intensity. The stroke volume (SV) and cardiac output (Q) measured ...
Tordi N - - 2004
We compared cardiac output (CO) determined simultaneously by electrical impedance cardiography method (CO (ICG)) and by the CO (2) rebreathing technique (CO (2REB)) during three different steady-state exercises (target heart rate of 120, 140, and 160 min (-1)) in 8 healthy fit young men. The mean difference correlation coefficient obtained ...
Shave R E - - 2004
BACKGROUND: Exercise induced cardiac fatigue has recently been observed after prolonged exercise. A moderate to high altitude has been suggested as a possible stimulus in the genesis of such cardiac fatigue. OBJECTIVE: To investigate if exercise induced cardiac fatigue and or cardiac damage occurs after prolonged exercise in a hypoxic ...
Sarzi Braga Simona - - 2004
Few data are available about the prognostic role of T wave alternans in patients with congestive heart failure. To assess the ability of T wave alternans, used alone or in combination with other risk markers, to predict cardiac death in decompensated patients, we enrolled 46 patients, mean age 59+/-9, males ...
Bunt Christopher M - - 2004
Rock bass (Ambloplites rupestris) are a widespread centrarchid species with both riverine and lacustrine populations. After precipitation events, rivers often carry elevated silt loads, where as lakes generally remain free from suspended silt and sediment. To examine the physiological effects of silt on rock bass, we conducted a series of ...
Koike Akira - - 2004
BACKGROUND: Until recently, compensatory mechanisms have been believed to regulate adequately cerebral blood flow in humans. However, this has been called into question by a series of new investigations suggesting that patients with left ventricular dysfunction suffer from cerebral hypoperfusion. We compared cerebral oxygenation during incremental exercise between patients with ...
Rhodes Melissa C - - 2003
BACKGROUND: Beta(2)-Adrenoceptor (betaAR) agonists, such as terbutaline, are widely used to arrest preterm labor. They also cross the placenta where they stimulate receptors in fetal tissues, which in turn use betaAR input for trophic control of cell replication and differentiation. METHODS: As rats are altricial, we administered terbutaline in two ...
Konttinen Niilo - - 2003
This study investigated the timing of the trigger pull in relation to the cardiac cycle during air rifle shooting. Electrocardiogram) was recorded from 20 male nonelite rifle shooters in two separate testing sessions. The testing was conducted at an indoor shooting range using an optoelectronic shooting system. Each participant fired ...
Sugawara J - - 2003
AIMS: The Modelflow method can estimate cardiac output from arterial blood pressure waveforms using a three-element model of aortic input impedance (aortic characteristic impedance, arterial compliance, and systemic vascular resistance). We tested the reliability of a non-invasive cardiac output estimation during submaximal exercise using the Modelflow method from finger arterial ...
Weinberg Laurence - - 2003
Mortality rates of exercise testing are low and cardiac rupture and sudden death are rare. Three cases of fatal cardiac rupture that occurred during exercise stress testing are reported. Once thought to be a fatal complication, there are increasing reports of ante-mortem diagnosis and survival. Cardiac rupture is a stuttering ...
Marconi Claudio - - 2003
Exercise intolerance in heart transplant recipients (HTR) has a multifactorial origin, involving complex interactions among cardiac, neurohormonal, vascular, skeletal muscle and pulmonary abnormalities. However, the role of these abnormalities may differ as a function of time after transplantation and of many other variables. The present review is aimed at evaluating ...
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