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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 F Institute of Sports and Preventive Medicine, University of Saarland, Saarbrücken, Germany. - - 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. Twenty-one healthy male subjects (29+/-5 years, 77+/-8 kg, VO(2max): 59.9+/-11.8 ml min(-1)kg(-1)) ...
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 ...
Fu Shi-Jian - - 2009
Effects of feeding on pre-exercise VO(2) and excess post-exercise oxygen consumption (EPOC) after exhaustive exercise were investigated in sedentary southern catfish, active herbivorous grass carp, omnivorous crucian carp, and sluggish omnivorous darkbarbel catfish to test whether feeding had different effects on EPOC and to compare EPOC in fishes with different ...
Medbø Jon Ingulf - - 2009
Blood haemoglobin concentration is regularly measured automatically by instruments reporting the value in around 1 min. The OSM2 from Radiometer is an example. Results from this instrument have been compared with those of a reference method using the hemiglobincyanide principle. Four healthy, moderately trained, young men (non-smokers) cycled for 2 ...
Moondra Vaibhav - - 2009
PURPOSE: Neuregulins (NRG) are growth factors that bind to receptors of the erbB family, and are known to mediate a number of processes involved in diverse tissues. Neuregulin-1beta is expressed in skeletal muscle and is activated by exercise. We hypothesized that NRG-1beta might circulate in the bloodstream and increase as ...
Astorino Todd A - - 2009
BACKGROUND: The most accepted criterion for confirming attainment of VO(2)max is a plateau in oxygen consumption (VO(2)) at VO(2)max, but its incidence varies. AIMS: To compare VO(2)max and VO(2) plateau incidence across various sampling intervals, and to examine predictors of the change in VO(2) (DeltaVO(2)) at VO(2)max. METHODS: Sedentary, recreationally-active, ...
Chockalingam Anand - - 2009
Morbid obesity and diabetes cause diastolic dysfunction that can be detected by Doppler echocardiography. Patients with the metabolic syndrome could demonstrate early diastolic dysfunction that may influence effort tolerance. A total of 32 patients (17 men) who fulfilled >/=2 of the 5 metabolic syndrome criteria were studied. The average age ...
McGregor Stephen J - - 2009
The purposes of this study were to determine the validity and reliability of high resolution accelerometers (HRA) relative to VO(2) and speed, and compare putative differences in HRA signal between trained (T) and untrained (UT) runners during treadmill locomotion. Runners performed 2 incremental VO(2max) trials while wearing HRA. RMS of ...
Bouassida Anissa A Laboratoire des adaptations cardio-circulatoires, respiratoires, métaboliques et hormonales à l'exercice musculaire, Faculté de Médecine Ibn El Jazzar , Sousse, Tunisie - - 2009
We examined the leptin response and related hormones during and after two sub-maximal exercise protocols in trained and untrained subjects. During this study, plasma concentrations of leptin [Lep], insulin [I], cortisol [C], growth hormone [GH], glucose [G] and lactate [La] were measured. 7 elite volleyball trained players (TR) and 7 ...
Tsang Tracey W TW Exercise, Health & Performance Faculty Research Group, Faculty of Health Sciences, The University of Sydney, - - 2009
The purpose of the study was to investigate if Chinese martial arts (Kung Fu, KF) might be effective for improving body composition, as well as being an appealing form of physical activity for inexperienced, sedentary, overweight/obese adolescents. Twenty subjects (age: 13.3 ± 1.8 y; BMI percentile: 98.6(86.5 - 99.8); 60% ...
Jenni S S Division of Cardiology, Clinic for Small Animal Internal Medicine, Vetsuisse Faculty, University of Zurich, Zurich, - - 2009
Boxers are predisposed to subaortic and pulmonic stenosis (SAS, PS). Screening of puppies may be useful in estimating the risk of their developing a defect that potentially compromises life expectancy or exercise tolerance. Presence of SAS or PS in adult Boxers can be predicted by auscultation and Doppler echocardiography at ...
Lee Stuart M C - - 2009
We have shown previously that treadmill exercise within lower body negative pressure (LBNPex) maintains upright exercise capacity (peak oxygen consumption, Vo(2peak)) in men after 5, 15, and 30 days of bed rest (BR). We hypothesized that LBNPex protects treadmill Vo(2peak) and sprint speed in women during a 30-day BR. Seven ...
Ring-Dimitriou Susanne - - 2009
The effect of exercise modalities on determinants of sarcopenia, specifically, lean tissue mass, maximal voluntary isometric contraction (MVIC), muscle quality (MQ), and cardiorespiratory fitness (VO(2)peak) over 12 weeks were studied in 42 (45-55 years, 60 days of amenorrhea, with </=1 h/week physical activity) perimenopausal females. Subjects were assigned to strength ...
Stege Gerben - - 2009
BACKGROUND: Measurements of transcutaneous carbon dioxide tension (PtcCO(2)) with current devices are proven to provide clinically acceptable agreement with measurements of partial arterial carbon dioxide tension (PaCO(2)) in several settings but not during cardiopulmonary exercise testing (CPET). OBJECTIVES: The primary objective of this study was to investigate the agreement between ...
Eastwood Annette - - 2009
This study assessed the relationship between haemoglobin mass (Hb(mass)) and maximum oxygen consumption (VO(2max)) in adolescents over 1 year. Twenty-three subjects (11-15 years) participated; 12 undertook ~12 months of cycle training (cyclists) and 11 were sedentary (controls). Hb(mass) and VO(2max) were measured approximately every 3 months. At baseline there was ...
Scott Jessica M - - 2009
The cardiovascular response to exercise in heart transplant recipients (HTR) has been compared with that of healthy individuals matched to the recipient age (RM controls). However, no study has compared HTR with donor age-matched (DM) controls. Moreover, the cardiovascular response to sustained submaximal exercise in HTR requires further evaluation. We ...
DiMenna Fred J - - 2009
We investigated the pedal rate dependency of the effect of priming exercise on pulmonary oxygen uptake (Vo(2)) kinetics. Seven healthy men completed two, 6-min bouts of high-intensity cycle exercise (separated by 6 min of rest) using different combinations of extreme pedal rates for the priming and criterion exercise bouts (i.e., ...
Rud Bjarne - - 2009
We attempted to test whether the balance between muscular metabolic capacity and oxygen supply capacity in endurance-trained athletes (ET) differs from that in a control group of normal physically active subjects by using exercises with different muscle masses. We compared maximal exercise in nine ET subjects [Maximal oxygen uptake (VO(2)max) ...
Bian Lin - - 2008
Odd- and even-order distortion products (DPs), evoked by two primary tones (f(1),f(2),f(1)<f(2)), represent different aspects of cochlear nonlinearity. The cubic and quadratic difference tones (CDT 2f(1)-f(2) and QDT f(2)-f(1)) are prominent representatives of the odd and even DPs. Distortion product otoacoustic emissions (DPOAEs) were measured within a primary level (L(1),L(2)) ...
Monteiro A G - - 2008
AIM: The purpose of present study was to compare the acute physiological responses to a circuit weight training with the responses to a combined circuit training (weight training and treadmill run). METHODS: The sample consisted of 25 individuals at an average state of training, 10 men and 15 female, between ...
Hoshimoto-Iwamoto Masayo - - 2009
We compared the prognostic power of end-tidal CO(2) pressure (PETCO(2)) during exercise, an index of arterial CO(2) pressure, with those of established respiratory gas indexes during exercise testing in patients with left ventricular dysfunction. Seventy-eight consecutive patients with a left ventricular ejection fraction (LVEF) <or=40% were enrolled in the study. ...
Hawkins Megan N - - 2009
The purpose of this investigation was to determine whether cardiovascular adaptations characteristic of long-term endurance exercise compensate more effectively during cardioselective beta(1)-adrenergic receptor blockade-induced reductions in sympathoadrenergic-stimulated contractility. Endurance-trained (ET) athletes (n = 8) and average-trained (AT; n = 8) subjects performed submaximal cycling exercise at moderate [45% maximum oxygen ...
Chieh Janet J - - 2008
PURPOSE: To evaluate the separate contribution of the retina versus retinal pigment epithelium (RPE)-choriocapillaris to visual function after treatment of neovascular age-related macular degeneration by measuring retinal sensitivity across three areas after macular translocation surgery. METHODS: Using the Nidek microperimeter-1, we tested retinal sensitivity across three areas in 35 patients ...
Maeder Micha Tobias - - 2009
Heart rate recovery 1 min after exercise termination (HRR-1) is a prognostic predictor. However, the influence of the exercise mode on HRR-1 is incompletely characterised. Twenty-nine young and healthy subjects and 16 elderly patients with chronic heart failure underwent cardiopulmonary exercise testing using cycle ergometer and treadmill ramp protocols in ...
Salemi Vera M C - - 2009
AIMS: Endomyocardial fibrosis (EMF) is a restrictive cardiomyopathy manifested mainly by diastolic heart failure. It is recognized that diastole is an important determinant of exercise capacity. The purpose of this study was to determine whether resting echocardiographic parameters might predict oxygen consumption (VO(2p)) by ergoespirometry and the prognostic role of ...
Mendonça Gonçalo V - - 2009
The purpose of this study was to investigate walking economy in response to steady-state locomotion in adult males with Down syndrome (DS) and in healthy controls. Twelve participants with DS (34.5 +/- 7.0 years) and 11 non-disabled controls (34.3 +/- 8.7 years) performed submaximal (0% grade, 2.5 km h(-1) for ...
Nickol Annabel H - - 2009
BACKGROUND: Hypercapnic ventilatory response (HCVR) techniques have not previously been adequately validated in patients with chronic obstructive pulmonary disease (COPD). We have tested the hypothesis that end-tidal PCO(2) may be used to test the HCVR in COPD during non-steady-state rebreathing, despite the fact that large (arterial-end-tidal) PCO(2) differences (P(a-et)CO(2)) exist ...
Myers Jonathan - - 2008
OBJECTIVE: The aim of this study is to evaluate the predictive accuracy of a cardiopulmonary exercise test (CPX) score. BACKGROUND: Cardiopulmonary exercise test responses, including peak VO(2), markers of ventilatory inefficiency (eg, the VE/VCO(2) slope and oxygen uptake efficiency slope [OUES]), and hemodynamic responses, such as heart rate recovery (HRR) ...
Varkey Emma - - 2009
OBJECTIVES: The aim of this study was to develop and evaluate an exercise program to improve maximum oxygen uptake (VO(2 max)) in untrained patients with migraine without making their migraines worse. PATIENTS AND METHODS: Twenty-six patients were studied at a headache clinic in Sweden. The exercise program, based on indoor ...
Bye Anja - - 2008
The relationship between inborn maximal oxygen uptake (VO(2max)) and skeletal muscle gene expression is unknown. Since low VO(2max) is a strong predictor of cardiovascular mortality, genes related to low VO(2max) might also be involved in cardiovascular disease. To establish the relationship between inborn VO(2max) and gene expression, we performed microarray ...
Billinger Sandra A - - 2008
BACKGROUND: Assessment of peak oxygen consumption (Vo(2)peak) using traditional modes of testing such as treadmill or cycle ergometer can be difficult in individuals with stroke due to balance deficits, gait impairments, or decreased coordination. OBJECTIVE: The purpose of this study was to quantitatively assess the validity and feasibility of a ...
Zavorsky Gerald S - - 2008
Morbidly obese individuals may have altered pulmonary diffusion during exercise. The purpose of this study was to examine pulmonary diffusing capacity for nitric oxide (DLNO) and carbon monoxide (DLCO) during exercise in these subjects. Ten morbidly obese subjects (age = 38 +/- 9 years, BMI = 47 +/- 7 kg/m(2), ...
Winsley Richard J - - 2009
Prepubertal boys' greater aerobic fitness (peak V O(2)) has been attributed to their larger lean body mass (LBM); this bestowing a greater heart size and consequent larger maximum cardiac output. No difference in peak arterio-venous (A-VO(2)) difference is thought to exist. However other work indicates that boys' aerobic fitness remains ...
Majerczak J - - 2008
We have examined the effect of 5 week cycling endurance training program on the sarco(endo)plasmic reticulum Ca2+ ATPase isoforms (SERCA1 and 2) and myosin heavy chain (MyHC) in the vastus lateralis muscle as well as on the oxygen uptake to power output ratio (VO2/PO) during incremental cycling. Fifteen untrained men ...
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