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Results 401 - 450 of 1202
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Apostolo Anna - - 2009
INTRODUCTION: Erectile dysfunction (ED) is frequent in males with chronic heart failure (HF) with a severe impact on quality of life for many individuals. The correlation of ED with age and HF severity, comorbidity, and treatment is unclear. AIM: We evaluated the correlation between ED and HF severity, treatment, and ...
Rud B - - 2009
We investigated the interaction between skeletal muscle exercise capacity and central restrictions using exercise modalities, which recruit differing levels of muscle mass in eight patients chronic obstructive lung disease (COPD) (FEV(1)% of predicted; 35 [SE 4%]) and eight healthy controls. Subjects performed conventional bicycling, two-leg knee extensor (2-KE) and single-leg ...
Vercruyssen Fabrice - - 2009
The aim of this study was to test the hypothesis that extreme pedal rates contributed to the slow component of oxygen uptake (VO(2) SC) in association with changes in surface electromyographic (sEMG) during heavy-cycle exercise. Eight male trained cyclists performed two square-wave transitions at 50 and 110 rpm at a ...
Jehn Melissa - - 2009
The aim of the study is to compare the cardiorespiratory response during the 6-min walk test (6MWT) with a symptom-limited cardiopulmonary exercise test (CPET) in patients with varying degrees of heart failure. Thirty-seven patients with heart failure (New York Heart Association I-III) were asked to complete a 6MWT and a ...
Dimopoulos Stavros - - 2009
BACKGROUND: Chronotropic response to exercise (CR) and heart rate recovery (HRR) immediately after exercise are indirect indices of sympathetic and parasympathetic activity, respectively. The aim of this study was to evaluate CR and HRR in patients with pulmonary arterial hypertension (PAH) in relation to disease severity. METHODS AND RESULTS: Ten ...
Dekerle J - - 2010
The aim of the present study was to assess whether the critical speed calculated by the slope of the distance-time relationship (S(d-t)) represents the boundary between the heavy and severe intensity domains in swimming and would be sustainable during intermittent exercise. Nine competitive male swimmers (mean+/-SD: aged 21.2+/-2.6 yrs; peak ...
Myers Jonathan - - 2009
The lowest minute ventilation (VE) and carbon dioxide production (VCO(2)) ratio during exercise has been suggested to be the most stable and reproducible marker of ventilatory efficiency in patients with heart failure (HF). However, the prognostic power of this index is unknown. A total of 847 HF patients underwent cardiopulmonary ...
Kipps Alaina K - - 2009
The objectives of this study were to characterize the exercise function of patients treated with balloon aortic valvuloplasty at <or=6 months of age, and identify factors associated with exercise dysfunction. Balloon aortic valvuloplasty is the primary therapy for neonatal aortic stenosis (AS). Residual and/or acquired abnormalities of left heart structure ...
Zarins Zinta A - - 2009
We examined the effect of endurance training on energy substrate partitioning during rest and exercise in postmenopausal women. Ten healthy sedentary (55 +/- 1 years old) subjects completed 12 weeks of endurance exercise training on a cycle ergometer (5 d/wk, 1 h/d, 65% peak oxygen consumption [Vo(2)peak]). Whole-body energy substrate ...
Arena Ross - - 2009
Large artery stiffness is now recognized as an important marker of cardiovascular health. The purpose of the present investigation was to assess the relationship between large artery stiffness and the oxygen uptake efficiency slope (OUES) and to determine whether the OUES is a viable surrogate for maximal oxygen uptake (VO(2max)) ...
Bryan Shirley N - - 2009
Regular walking is associated with many health benefits and is of particular interest for the promotion of daily physical activity. The purpose of this study is to describe the epidemiology of walking for exercise among Canadian adults aged 18-55 years. Nationally representative cross-sectional data from the National Population Health Survey ...
Stachenfeld Nina S - - 2009
We hypothesized that exercise-associated hyponatremia (EAH) is a function of excess sodium loss combined with high water intake in women at risk for dysnatremias during endurance exercise. We further hypothesized that estradiol and progesterone exposure increases fluid retention and sodium loss during exercise in women at risk for EAH. For ...
Goto Kazushige - - 2009
CONTEXT: The effects of GH on exercise performance remain unclear. OBJECTIVE: The aim of the study was to examine the effects of GH receptor (GHR) antagonist treatment on exercise performance. DESIGN: Subjects were treated with the GHR antagonist pegvisomant or placebo for 16 d. After the treatment period, they exercised ...
Maurer Mathew M - - 2009
BACKGROUND: Hemodynamic responses to exercise were assessed in patients with varying degrees of chronic heart failure (CHF) to determine the feasibility of using bioreactance during exercise testing in multicenter studies of CHF. METHODS AND RESULTS: A total of 210 symptomatic CHF patients and 22 subjects without heart failure were subjected ...
Oliveira Ricardo B - - 2009
There is scarce information regarding the prognostic utility of peak exercise oxygen pulse (peak O(2) pulse), a surrogate for stroke volume, in patients with heart failure (HF). From May 1994 to November 2007, 998 patients with HF underwent cardiopulmonary exercise testing. The ability of peak oxygen uptake (VO(2)) and peak ...
Arena R - - 2010
Heart rate recovery (HRR) is an important indicator of cardiovascular health. The purpose of the present investigation is to examine the influence of sex on the relationship between HRR and other markers of cardiovascular health. Two hundred and seventy-five apparently healthy subjects participated in this study. Subjects underwent cardiopulmonary exercise ...
Capelli C - - 2009
Beat-by-beat Q(a)O2 and breath-by-breath VO2 were assessed in ten male subjects (24 +/- 3.5 years; 78 +/- 7.7 kg; 182 +/- 5.6 cm) during cycling exercise at 50 W before and after a 14-day period of head-down tilt-bed rest (HDTBR). O2 deficit (DefO2) was calculated as the difference between the ...
Oliveira Ricardo B - - 2009
BACKGROUND: Maximal oxygen pulse (O(2) pulse) mirrors the stroke volume response to exercise, and should therefore be a strong predictor of mortality. Limited and conflicting data are, however, available on this issue. METHODS: Nine hundred forty-eight participants, classified as those with cardiopulmonary disease (CPD) and those without (non-CPD), underwent cardiopulmonary ...
Evans Elizabeth S - - 2009
PURPOSE: This study compared the heart rate (HR), rate of perceived exertion (RPE), and blood lactate (BL) responses to aerobic exercise between posttreated breast cancer patients and apparently healthy, age-matched controls. METHODS: Seven patients and 7 control subjects underwent a submaximal treadmill test for the estimation of Vo(2max). Exercise intensities ...
Tartibian B - - 2009
AIM: The aim of this study was to investigate inflammatory markers and muscle damage indices in response to two different intensity exercises, eighteen young volunteers participated in this study. METHODS: The participants were randomly divided into two groups: moderate exercise (60% VO(2) max) and intensive exercise (75% VO(2) max). Each ...
Zarins Zinta A - - 2009
We examined the effects of endurance training on parameters of glucose flux during rest and exercise in postmenopausal women. Ten sedentary, but healthy women (55 +/- 1 yr) completed 12 wk of endurance exercise training on a cycle ergometer [5 days/wk, 1 h/day, 65% peak oxygen consumption (Vo(2peak))]. Flux rates ...
McKay Bryon R - - 2009
The early time course of adaptation of pulmonary O(2) uptake (Vo(2)(p)) (reflecting muscle O(2) consumption) and muscle deoxygenation kinetics (reflecting the rate of O(2) extraction) were examined during high-intensity interval (HIT) and lower-intensity continuous endurance (END) training. Twelve male volunteers underwent eight sessions of either HIT (8-12 x 1-min intervals ...
Marcuello Ana - - 2009
It has been clearly established that mitochondrial variants, among other potential factors, influence on VO(2max). With this study we sought to determine whether this genetic predisposition could be modified by steady exercise. Mitochondrial genetic variants were determined in 70 healthy controls (CON) and in 77 athletes who trained regularly (50 ...
Duque Ivan Leonardo - - 2009
INTRODUCTION The measurement of the maximal oxygen uptake as a parameter of cardiorespiratory fitness is useful in exercise prescription in functional restoration programs but this measurement requires the subject's maximal exertion which is not always possible in patients with chronic low back pain. The purpose of this study was to ...
Roten L - - 2009
BACKGROUND: Peak oxygen uptake (peak Vo(2)) is an established integrative measurement of maximal exercise capacity in cardiovascular disease. After heart transplantation (HTx) peak Vo(2) remains reduced despite normal systolic left ventricular function, which highlights the relevance of diastolic function. In this study we aim to characterize the predictive significance of ...
Giardini Alessandro - - 2009
OBJECTIVES: The goal of this study was to assess the prognostic value of the cardiopulmonary exercise test (CPET) in patients who received a Mustard and Senning (M/S) operation. BACKGROUND: Patients who received an M/S operation have increased long-term risk of cardiovascular morbidity and mortality. Limited information is available on how ...
García-Pallarés Jesús - - 2009
This study was undertaken to analyze changes in selected cardiovascular and neuromuscular variables in a group of elite kayakers across a 12-week periodized cycle of combined strength and endurance training. Eleven world-class level paddlers underwent a battery of tests and were assessed four times during the training cycle (T0, T1, ...
Midgley A W - - 2009
Traditional (.)VO(2max) criteria are typically based on attainment of a (.)VO2 plateau, and threshold values for the respiratory exchange ratio, heart rate and blood lactate concentration. Despite long-standing criticisms directed at these criteria, their use remains widespread. This article discusses an alternative procedure, termed the verification phase, for confirming the ...
Charloux A - - 2010
The aims of this study were to evaluate the feasibility of successive diffusing capacity of the lung for carbon monoxide (DLCO) measurements during two different exercise tests (upright cycling), and to compare the relationships between DLCO and pulmonary blood flow (Qc). Eight healthy subjects performed an incremental test (1-min step) ...
Swigris J J - - 2009
Measures of oxygenation have not been assessed for prognostic significance in systemic sclerosis-related interstitial lung disease (SSc-ILD). 83 subjects with SSc-ILD performed a maximal cardiopulmonary exercise test with an arterial line. The agreement between peripheral oxygen saturation (SpO2) and arterial oxygen saturation (SaO2) was examined and survival differences between subgroups ...
Bailey Stephen J - - 2009
We hypothesized that a short-term training program involving repeated all-out sprint training (RST) would be more effective than work-matched, low-intensity endurance training (ET) in enhancing the kinetics of oxygen uptake (Vo(2)) and muscle deoxygenation {deoxyhemoglobin concentration ([HHb])} following the onset of exercise. Twenty-four recreationally active subjects (15 men, mean +/- ...
Mattsson C M - - 2010
In this paper we report a reversed drift in heart rate (HR) but increased oxygen uptake (VO(2)) during ultra-endurance exercise. Nine well-trained male athletes performed 24-h exercise in a controlled laboratory setting, with alternating blocks of kayaking, running and cycling. Each block included 110 min of exercise and 10 min ...
Johnson Blair D - - 2009
The ability to modify power output (PO) in response to a changing stimulus during exercise is crucial for optimizing performance involving an integration system involving a performance template and feedback from peripheral receptors. The rapidity with which PO is modified has not been established, but would be of interest relative ...
Cannon, Edward W.
As a result of aerobic training, the rate and magnitude of the recovery VO₂ following submaximal exercise at the same absolute workloads is decreased (Hagberg et al., 1980). To date there has been little research associated with the effects of an increased aerobic power on the recovery VO₂ following supramaximal ...
Bentley David J - - 2009
The purpose of this study was to examine the relationship between skeletal muscle monocarboxylate transporters 1 and 4 (MCT1 and MCT4) expression, skeletal muscle oxidative capacity and endurance performance in trained cyclists. Ten well-trained cyclists (mean +/- SD; age 24.4 +/- 2.8 years, body mass 73.2 +/- 8.3 kg, VO(2max) ...
Van Laethem Christophe - - 2009
PURPOSE: Chronic kidney disease (CKD) is common after heart transplantation (HTx). This study assessed the influence of CKD on exercise capacity and ventilatory efficiency after HTx. METHODS: This cross-sectional study included 79 HTx patients (age 64 +/- 10 years, 66 men) at 8.1 +/- 4.3 years post-HTx who underwent maximal ...
Faisal Azmy - - 2009
Cardiorespiratory interactions at the onset of dynamic cycling exercise are modified by warm-up exercises. We tested the hypotheses that oxygen uptake (Vo(2)) and cardiac output (Q) kinetics would be accelerated at the onset of heavy and moderate cycling exercise by warm-up. Nine male endurance athletes (peak Vo(2): 60.5 +/- 3.2 ...
Scharhag-Rosenberger Friederike - - 2010
Given percentages of VO(2max) are widely used for training and study purposes although they might not result in homogeneous metabolic strain. Therefore, the homogeneity of metabolic responses to prolonged exercise at fixed percentages of VO(2max) should be investigated. Procedures: Twenty-one healthy male subjects (29+/-5 years, 77+/-8 kg, VO(2max): 59.9+/-11.8 ml ...
Hargens Trent A - - 2009
BACKGROUND: Obstructive sleep apnea (OSA) is a disorder characterized by repetitive obstructions of the upper airway. Individuals with OSA experience intermittent hypoxia, hypercapnia, and arousals during sleep, resulting in increased sympathetic activation. Chemoreflex activation, arising from the resultant oscillatory disturbances in blood gases from OSA, exerts control over ventilation, and ...
Arena Ross - - 2009
Peak oxygen consumption (Vo(2)) is routinely assessed in patients with heart failure undergoing cardiopulmonary exercise testing. The purpose of the present investigation was to determine the prognostic ability of several established peak Vo(2) prediction equations in a large heart failure cohort. One thousand one hundred sixty-five subjects (70% males; age, ...
Parikh Mona N - - 2009
Peak exercise oxygen consumption (Vo(2)) and the Heart Failure (HF) Survival Score (HFSS) were developed in middle-aged patient cohorts referred for heart transplantation with HF. The prognostic value of Vo(2) in patients >65 years has not been well studied. Accordingly, the prognostic value of peak Vo(2) was evaluated in these ...
Vollaard Niels B J - - 2009
It has not been established which physiological processes contribute to endurance training-related changes (Delta) in aerobic performance. For example, the relationship between intramuscular metabolic responses at the intensity used during training and improved human functional capacity has not been examined in a longitudinal study. In the present study we hypothesized ...
Faoro Vitalie - - 2009
Altitude exposure is associated with mild pulmonary hypertension and decreased exercise capacity. We tested the hypothesis that pulmonary vascular resistance (PVR) contributes to decreased exercise capacity in hypoxic healthy subjects. An incremental cycle ergometer cardiopulmonary exercise test and echocardiographic estimation of pulmonary artery pressure (Ppa) and cardiac output to calculate ...
Wideman Laurie - - 2009
PURPOSE: To determine substrate utilization and energy expenditure during maximal and submaximal exercise and recovery in adolescents with cystic fibrosis (CF) and healthy age-matched controls (C). METHODS: Ten clinically stable CF patients (four girls, six boys; age = 10-22 yr) were matched by body mass index, age, gender, and Tanner ...
Kielbassa Andrej M - - 2009
STATEMENT OF PROBLEM: Due to inter- and intraexaminer differences, subjective evaluation of tooth color is deemed problematic. PURPOSE: The purpose of this study was to evaluate the efficacy of home bleaching products, and to compare visual and computer-aided tooth shade determinations when various agents were applied. MATERIAL AND METHODS: Human ...
Kasikcioglu Erdem - - 2009
It is accepted that cardiopulmonary exercise testing is one of the most valuable parameters, especially peak oxygen uptake (VO(2)), for the evaluation of risk assessment in lung cancer surgery. It therefore represents an attractive way of identifying a patient at high risk for postoperative complications. However, many patients do not ...
Preisler N - - 2009
OBJECTIVE: We examined the effect of aerobic exercise in patients with spinal and bulbar muscular atrophy (SBMA). SBMA is caused by a defect androgen receptor. This defect causes motor neuron death, but considering the important function of androgens in muscle, it is possible that muscle damage in SBMA also occurs ...
Robbins Jennifer L - - 2009
Although both capillary density and peak oxygen consumption (Vo(2)) improve with exercise training, it is difficult to find a relationship between these two measures. It has been suggested that peak Vo(2) may be more related to central hemodynamics than to the oxidative potential of skeletal muscle, which may account for ...
Baker Lindsay B - - 2009
This study tested the hypothesis that the change in body mass (DeltaBM) accurately reflects the change in total body water (DeltaTBW) after prolonged exercise. Subjects (4 men, 4 women; 22-36 year; 66 +/- 10 kg) completed 2 h of interval running (70% VO(2max)) in the heat (30 degrees C), followed ...
Ogoh Shigehiko - - 2009
The respiratory and cerebrovascular reactivity to changes in arterial Pco(2) (Pa(CO(2))) is an important mechanism that maintains CO(2) or pH homeostasis in the brain. It remains unclear, however, how cerebrovascular CO(2) reactivity might influence the respiratory chemoreflex. The purpose of the present study was therefore to examine the interaction between ...
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