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Results 351 - 400 of 1204
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May Anne M - - 2010
OBJECTIVE: To examine the use of a submaximal exercise test in detecting change in fitness level after a physical training program, and to investigate the correlation of outcomes as measured submaximally or maximally. DESIGN: A prospective study in which exercise testing was performed before and after training intervention. SETTING: Academic ...
No?l Martin - - 2010
We previously observed an attenuation of exercise-induced myocardial ischemia on the ergocycle during a ramp protocol compared to the standard Bruce protocol treadmill test in patients with coronary heart disease. However, it was uncertain whether decreased ischemia on the ergocycle resulted from the warm-up effect of the more gradual ramp ...
Jaussaud Jérémie - - 2010
The minute ventilation/carbon dioxide production (VE/VCO(2)) slope and peak circulatory power, like peak oxygen consumption (VO(2)), possess strong prognostic values in heart failure but have not been studied after ventricular resynchronization. In this retrospective study, we evaluated the evolution of ventilatory response, effort capacity, functional status, peak circulatory power and ...
Guiraud Thibaut - - 2010
High intensity interval training has been shown to be more effective than moderate intensity continuous training for improving maximal oxygen uptake (VO(2max)) in patients with coronary heart disease (CHD). However, no evidence supports the prescription of one specific protocol of high intensity interval exercise (HIIE) in this population. The purpose ...
Gordon D - - 2010
The purpose of this study was to determine the effects of a reduced whole body blood volume on the kinetic response of VO(2) during moderate and heavy intensity exercise. Six males and four females (age, 21+/-2 yrs; height, 175.2+/-5.1 cm; weight, 66.4+/-2.8 kg; VO(2)max, 53.0+/-4.1 ml x kg (-1) x ...
Li Xiu-Ming - - 2010
To examine the effects of exercise training on the metabolic interaction between digestion and locomotion in juvenile darkbarbel catfish (Peltebagrus vachelli) (5.58+/-0.04 g), the postprandial metabolic response, critical swimming speeds (U(crit)) and oxygen consumption rates (VO(2)) during swimming were measured on fish held at a constant temperature (25 degrees C). ...
Al-Rahamneh Harran Q - - 2010
OBJECTIVE: To investigate the strength of the relationship between ratings of perceived exertion (RPE) and oxygen uptake (Vo(2)), heart rate, ventilation (Ve) and power output (PO) during an arm-crank ramped exercise test to volitional exhaustion in men and women who differed in physical status. DESIGN: Each participant completed an arm-crank ...
Fernandes Susan M - - 2010
Patients with previous Fontan surgery have reduced peak oxygen consumption (Vo 2), and data regarding progression of exercise intolerance is limited. The purpose of this study was to assess the evolution of exercise tolerance in patients with previous Fontan surgery. We performed a retrospective cohort study of patients with previous ...
Figueroa A - - 2011
High-intensity resistance exercise may acutely increase arterial stiffness. Vascular occlusion (VO) acutely decreases arterial stiffness. The purpose of this study was to evaluate acute aortic hemodynamic responses to low-intensity resistance exercise (LIRE) with slow eccentric movement with and without VO. Twenty-three young healthy subjects (12 women and 11 men) were ...
Rasmussen P - - 2010
AIM: Cerebral mitochondrial oxygen tension (P(mito)O(2)) is elevated during moderate exercise, while it is reduced when exercise becomes strenuous, reflecting an elevated cerebral metabolic rate for oxygen (CMRO(2)) combined with hyperventilation-induced attenuation of cerebral blood flow (CBF). Heat stress challenges exercise capacity as expressed by increased rating of perceived exertion ...
Marwood Simon - - 2010
The existence of an acetyl group deficit at or above 90% of maximal oxygen uptake (VO(2max)) has proved controversial, with contradictory results likely relating to limitations in previous research. The purpose of the present study was to determine whether the "acetyl group deficit" occurs at the start of exercise at ...
Vilke Gary M - - 2011
Background: Combative individuals often require physical restraint in the prehospital and law enforcement setting. Specialized restraint chairs have been utilized for this purpose in the latter case, but concern has arisen that restrained individuals are at risk for ventilatory compromise and asphyxiation. Objective: We sought to determine if placement in ...
Rubis Pawel - - 2010
To evaluate right-ventricular (RV) function during stress echocardiography (SE) and to assess its relationship with exercise capacity in heart failure (HF) patients. We included 88 patients aged 60.9 +/- 11.2 years with a mean LVEF of 27.2 +/- 9.5%. The following RV parameters were measured at baseline and peak exercise ...
Gayda Mathieu - - 2010
The aim of this study was to determine the level of agreement between the new Aquatrainer system and the facemask in the assessment of submaximal and maximal cardiopulmonary responses during exercise performed on ergocycle. Twenty-six physically active healthy subjects (mean age: 41 +/- 14 years) performed a submaximal constant work ...
McCullough Peter A - - 2010
Decreased renal function has been consistently associated with increased mortality among patients with systolic heart failure. The relationship between estimated glomerular filtration rate (eGFR) and other high-risk features including reduced cardiorespiratory fitness has not been previously reported in this patient population. The HF-ACTION trial was a prospective, randomized trial of ...
Leung Terence S - - 2010
A new approach to measure muscle oxygen saturation (SmO(2)) using near infrared spectroscopy (NIRS) has been proposed in this paper. This approach exploits the cyclic NIRS signals seen during exercise which are often regarded as "movement artefacts". This new measure, which we term the "cyclic SmO(2)", has the potential to ...
Ward Susan A - - 2010
As the time constant of the phase 2 (?2) ventilatory response (tauV'(E)) to moderate exercise (< lactate threshold, thetaL) is reduced by exogenous procedures that augment peripheral (carotid) chemosensitivity (hypoxia; chronic metabolic acidaemia), we examined whether an acute endogenous metabolic acidaemia had a similar effect. Six subjects completed two tests ...
Elsais A - - 2010
Myasthenia gravis (MG) is an autoimmune disease of neuromuscular synapses, characterized by muscular weakness and reduced endurance. Remission can be obtained in many patients. However, some of these patients complain of fatigue. The aim of this study was to assess exercise capacity and lung function in well-regulated MG patients. Ten ...
Erdogan Ali A Süleyman Demirel University, Medical School, Department of Sports Medicine , Isparta, - - 2010
Accurately assessing the energy expenditure (EE) of different types of physical activity is important for exercise prescription in obese individuals. The aim of this study was to examine the accuracy of the Polar S810i Heart Rate Monitor and SenseWear Pro Armband (SWA) for estimating energy expenditure (EE) during indoor rowing ...
Helgerud Jan - - 2010
The present study investigated whether there are differences in running economy at different velocities for well-trained distance runners, and to what extent a commonly used incremental protocol for measuring oxygen uptake (VO(2)) at different velocities affects the reliability of these measurements. Fifteen well-trained distance runners (9 male and 6 female) ...
Marek E - - 2009
Exhaled breath condensate (EBC) contains among a large number of mediators hydrogen peroxide (H2O2) as a marker of airway inflammation and oxidative stress. Similarly EBC pH also changes in respiratory diseases. It was the aim of our investigation to prove if hydrogen peroxide release and changes in pH of EBC ...
Rebelo Ana Cristina S - - 2010
BACKGROUND: The purpose of this study was to evaluate the effect of long-term use of oral contraceptives (OC) containing 0.20 mg of ethinylestradiol (EE) combined with 0.15 mg of gestodene (GEST) on the peak aerobic capacity and at the anaerobic threshold (AT) level in active and sedentary young women. STUDY ...
Jones Andrew M - - 2009
The rate at which VO(2) adjusts to the new energy demand following the onset of exercise strongly influences the magnitude of the "O(2) deficit" incurred and thus the extent to which muscle and systemic homeostasis is perturbed. Moreover, during continuous high-intensity exercise, there is a progressive loss of muscle contractile ...
Moholdt Trine T - - 2009
BACKGROUND: Peak oxygen uptake (Vo(2peak)) strongly predicts mortality in cardiac patients. We compared the effects of aerobic interval training (AIT) versus moderate continuous training (MCT) on Vo(2peak) and quality of life after coronary artery bypass grafting (CABG). METHODS: Fifty-nine CABG patients were randomized to either AIT at 90% of maximum ...
Dobson John L - - 2009
The Virtual Physiology of Exercise Laboratory (VPEL) program was created to simulate the test design, data collection, and analysis phases of selected exercise physiology laboratories. The VPEL program consists of four modules: 1) cardiovascular, 2) maximal O(2) consumption (Vo(2max)), 3) lactate and ventilatory thresholds, and 4) respiratory exchange ratio. The ...
Chin Lisa M K - - 2010
The effect of hyperventilation-induced hypocapnic alkalosis (HYPO) and prior heavy-intensity exercise (HVY) on pulmonary O(2) uptake (VO(2p)) kinetics were examined in young adults (n = 7) during moderate-intensity exercise (MOD). Subjects completed leg cycling exercise during (1) normal breathing (CON, P(ET)CO(2) approximately 40 mmHg) and (2) controlled hyperventilation (HYPO, P(ET)CO(2) ...
Larsen Filip J - - 2010
The anion nitrate-abundant in our diet-has recently emerged as a major pool of nitric oxide (NO) synthase-independent NO production. Nitrate is reduced stepwise in vivo to nitrite and then NO and possibly other bioactive nitrogen oxides. This reductive pathway is enhanced during low oxygen tension and acidosis. A recent study ...
Mart?nez-Redondo Diana - - 2010
Mitochondrial background has been demonstrated to influence maximal oxygen uptake (VO(2max), in mLkg(-1)min(-1)), but this genetic influence can be compensated for by regular exercise. A positive correlation among electron transport chain (ETC) coupling, ATP and reactive oxygen species (ROS) production has been established, and mitochondrial variants have been reported to ...
Guazzi Marco - - 2009
This study tested the hypothesis that increasing levels of maximal dyspnea on exertion (DOE) during cardiopulmonary exercise testing (CPX) is associated with heart failure (HF) disease severity and worsening prognosis. Three hundred seventy-six HF patients underwent CPX where ventilatory efficiency (minute ventilation/carbon dioxide production; VE/VCO(2) slope), peak oxygen consumption (VO(2)), ...
Sekiguchi Makoto - - 2009
Cardiac function during exercise is assumed to be important in determining exercise tolerance. The aims of this study were to evaluate changes in left ventricular diastolic function (LVDF) during exercise and its effect on exercise tolerance assessed by a noninvasive method, exercise-stress tissue Doppler echocardiography. Twenty-six men with sinus rhythm ...
duManoir Gregory R - - 2010
The kinetics of pulmonary O(2) uptake (VO(2p)), limb blood flow (LBF) and deoxygenation (DeltaHHb) of the vastus lateralis (VL) and vastus medialis (VM) muscles during the transition to moderate-intensity knee-extension exercise (MOD) was examined. Seven males (27 +/- 5 years; mean +/- SD) performed repeated step transitions (n = 4) ...
Donath Lars - - 2010
Aerobic exercise training is considered an adequate complementary treatment strategy for major depressive disorder (MDD). However, there is a need for comparative methodological investigations to determine the appropriate exercise intensity for these patients. The study compared submaximal exercise intensity determination with those derived from maximal parameters such as percentages of ...
Goda Ayumi - - 2009
Peak oxygen consumption (Vo(2)) is a powerful prognostic predictor of survival in patients with chronic heart failure (CHF) because it provides an indirect assessment of a patient's ability to increase cardiac output (CO). However, many patients with CHF who undergo cardiopulmonary exercise testing are unable to perform maximal exercise. New ...
Vallejo L - - 2010
Thirteen patients with haemophilia A took part in this study voluntarily. They underwent an aquatic training programme over a 9-week period (27 sessions; three sessions per week; 1 h per session). Their motor performance was assessed by the following cardio-respiratory and mechanical variables before and after the training programme: oxygen ...
Rizzi Camila F - - 2010
BACKGROUND: Conflicting data regarding exercise capacity and obstructive sleep apnea (OSA) have been published, which may be partially explained by the difficulty of controlling all of the confounding factors. The aim of this study is to evaluate the exercise, anthropometric, and blood parameters in lean, sedentary patients with OSA compared ...
Winkelmann Eliane R - - 2009
BACKGROUND: This small clinical trial tested the hypothesis that the addition of inspiratory muscle training (IMT) to aerobic exercise training (AE) results in further improvement in cardiorespiratory responses to exercise than those obtained with AE in patients with chronic heart failure (CHF) and inspiratory muscle weakness (IMW). METHODS: Twenty-four patients ...
Deogenov Victor A - - 2009
OBJECTIVE: To determine whether during hypokinesia (diminished movement) periodic physical exercise affects calcium (Ca(2+)) balance and Ca(2+) loss. METHODS: Studies were conducted on 30 physically healthy male volunteers during the preexperimental period of 30 days and the experimental period of 364 days. They were equally divided into three groups: active ...
Rubis Pawel - - 2009
AIM: To assess changes of systolic function using tissue Doppler imaging (TDI) during stress echocardiography and its impact on exercise capacity in heart failure (HF) patients (pts). MATERIAL AND METHODS: 80 pts (65 male), mean age of 59.3 +/- 10.9 years, NYHA class 1.95 +/- 0.8, left ventricle ejection fraction ...
Giardini Alessandro - - 2009
Patients who undergo the arterial switch operation for transposition of the great arteries (TGA) are at risk of reduced exercise capacity, with most reports focusing on chronotropic incompetence as the cause. Residual right ventricular outflow tract (RVOT) obstruction is relatively common after the arterial switch operation, but its effect on ...
Lepretre P-M - - 2009
BACKGROUND: Ageing is known to be associated with a decrease in peak oxygen consumption (VO2peak) and maximal tolerated power (MTP). Regular physical exercise is the most appropriate to improve aerobic capacity, but its effect still remained discussed in old people. DESIGN: The aim of this study was to determine whether ...
Gardin Julius M - - 2009
Patients with systolic heart failure often have concomitant left ventricular (LV) diastolic dysfunction. Although in animal models diastolic dysfunction is associated with worsening exercise capacity and prognosis, information regarding these relationships in patients with established systolic heart failure (HF) is sparse. HF-ACTION was a large, multicenter National Institutes of Health-funded ...
Felker G Michael - - 2009
To examine the relationship between N-terminal pro-brain natriuretic peptide (NT-proBNP) and exercise capacity in a large contemporary cohort of patients with chronic heart failure. Natriuretic peptides such as NT-proBNP are important biomarkers in heart failure. The relationship between NT-proBNP and exercise capacity has not been well studied. We analyzed the ...
Webb Heather E - - 2010
Firefighters are subjected to a combination of physical and mental challenges in the course of their occupational responsibilities. However, due to the ecological factors involved with firefighting, it makes it extremely difficult to examine physiological and psychological changes that occur as a result of these combined challenges. The purpose of ...
Guazzi Marco - - 2009
BACKGROUND: The six-minute walk test (6MWT) and cardiopulmonary exercise testing (CPET) are the 2 testing modalities most broadly used for assessing functional limitation in patients with heart failure (HF). A comprehensive comparison on clinical and prognostic validity of the 2 techniques has not been performed and is the aim of ...
Senchina David S - - 2009
The purpose of this multidisciplinary investigation was to characterize cytokine production by human blood mononuclear cells after 2 contrasting exercise bouts (a maximal graded oxygen consumption [VO(2)max] test and 90 min of cycling at 85% of ventilatory threshold [VT]) when stimulated in vitro with extracts from bloodroot (Sanguinaria canadensis), coneflower ...
Muster Alexander J - - 2010
As the human lifespan becomes progressively extended, potential health-related effects of intense aerobic exercise after age 65 need evaluation. This study evaluates the cardiovascular (CV), pulmonary, and metabolic effects of competitive distance running on age-related deterioration in men between 69 (+/-3) and 77 (+/-2) years (mean +/- SD). Twelve elderly ...
Sperandio Priscila Abreu - - 2009
Impaired muscle blood flow at the onset of heavy-intensity exercise may transiently reduce microvascular O(2) pressure and decrease the rate of O(2) transfer from capillary to mitochondria in chronic heart failure (CHF). However, advances in the pharmacological treatment of CHF (e.g., angiotensin-converting enzyme inhibitors and third-generation beta-blockers) may have improved ...
Cross Troy J - - 2010
The contribution of respiratory muscle O2 uptake ((.)V(O2RM)) to the development of the slow component of O2 uptake kinetics ((.)V(O2SC)) is unclear. The aim of the present study was to examine the impact of respiratory muscle unloading (via breathing, a He-O2 mixture) on the amplitude of (.)V(O2SC) during exercise performed ...
Carvalho Vitor Oliveira - - 2010
In healthy subjects, the percentage of heart rate reserve (%HRR) versus the percentage of oxygen consumption reserve (%VO(2)R) is the closest relationship between heart rate and VO(2) and it seems also to be true to heart failure patients only if they are under optimized beta-blocker therapy. To evaluate the closest ...
Hayashi Keiji - - 2009
To test the hypothesis that the hyperthermia-induced ventilatory response relates to aerobic power and/or the cutaneous vasodilatory response during exercise, we asked 18 subjects to perform 3 kinds of exercise: an incremental exercise to determine peak oxygen consumption (V(O)(2peak)), a steady state exercise at 50% of V(O)(2peak) to determine the ...
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