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Zerbini Livio - - 2012
Pulmonary oxygen uptake, heart rate (HR), and deoxyhemoglobin (HHb) kinetics were studied in a group of older adults exercising in hypoxic conditions. Fourteen healthy older adults (aged 66 ± 6 years) performed 4 exercise sessions that consisted of (i) an incremental test to exhaustion on a cycloergometer while breathing normoxic room air ...
Wright Rex A - - 2012
Experiments were executed to provide new evidence relevant to the recent suggestion that fatigue should augment or retard cardiovascular response depending on the difficulty of the challenge at hand. Participants walked on a treadmill while wearing a vest fitted with 5 or 25 pounds of weight. Later, they mounted a ...
Sidhu Simranjit K - - 2012
The excitability of the motor cortex increases as fatigue develops during sustained single-joint contractions, but there are no previous reports on how corticospinal excitability is affected by sustained locomotor exercise. Here we addressed this issue by measuring spinal and cortical excitability changes during sustained cycling exercise. Vastus lateralis (VL) and ...
Mikulic Pavle - - 2012
To examine variations in physical, physiological, and performance parameters over an annual training cycle in a world champion rowing crew. Four world-class rowers, all of them members of the men's heavyweight quadruple sculls squad who are current world rowing champions, were assessed 3 times at regular 4-mo intervals during the ...
Burns Jack M - - 2012
Manufacturers of uncoupled cycling cranks claim that their use will increase economy of motion and gross efficiency. Purportedly, this occurs by altering the muscle-recruitment patterns contributing to the resistive forces occurring during the recovery phase of the pedal stroke. Uncoupled cranks use an independent-clutch design by which each leg cycles ...
Kilding Andrew E - - 2012
To determine the effects of ingesting caffeine (CAFF) and sodium bicarbonate (SB), taken individually and simultaneously, on 3-km cycling time-trial (TT) performance. Ten well-trained cyclists, age 24.2 ± 5.4 yr, participated in this acute-treatment, double-blind, crossover study that involved four 3-km cycling TTs performed on separate days. Before each TT, ...
Ridgel Angela L - - 2012
OBJECTIVE: To develop a rapid cadence cycling intervention (active-assisted cycling, AAC) using a motorized bike and to examine physiological perimeters during these sessions in individuals with Parkinson's disease (PD). A secondary goal was to examine if a single session of active-assisted cycling at a high cadence would promote improvements in ...
Laurence George - - 2012
Abstract It is not known if ergogenic effects of caffeine ingestion in athletic groups occur in the sedentary. To investigate this, we used a counterbalanced, double-blind, crossover design to examine the effects of caffeine ingestion (6 mg · kg(-1) body-mass) on exercise performance, substrate utilisation and perceived exertion during 30 minutes of ...
Jacobs Robert - - 2012
ABSTRACT: The purpose of this study was compare three cycling cadences in efficiency/economy, local tissue oxygen saturation, heart rate, blood lactate, and global and local rating of perceived exertion. Subjects were 14 trained cyclists/triathletes (mean age 30.1 ± 5.3 yr; VO2 peak 60.2 ± 5.0 ml/kg/min) who performed three 8 ...
Schilling Brian K - - 2012
ABSTRACT: Metabolic and neurological responses to four bouts of lower or upper body resistance exercise preceded by cycle ergometry or rest were assessed. Nine resistance-trained men (26.7±6.6 years) underwent bouts of 1) cycle ergometry then bench press, 2) bench press only, 3) cycle ergometry then back squat 4) back squat ...
Hartwich Doreen - - 2012
We sought to determine whether menstrual cycle phase influences muscle metaboreflex control of spontaneous cardiac baroreflex sensitivity (cBRS), blood pressure (BP) and heart rate (HR). Twenty three young women not taking oral contraceptives were studied during the early (EF; low oestrogen, low progesterone) and late follicular (LF; high oestrogen, low ...
Disley B X - - 2012
Unexplored in scientific literature, Q Factor describes the horizontal width between bicycle pedals and determines where the foot is laterally positioned throughout the pedal stroke. The aim of the study was to determine whether changing Q Factor has a beneficial effect upon cycling efficiency and muscular activation. A total of ...
Le Meur Y - - 2012
PURPOSE: To evaluate spring-mass (SM) behavior and associated electromyographic (EMG) activity during a run to exhaustion following a cycle exercise in trained triathletes. METHODS: Ten triathletes completed four tests: a cycling test to determine V˙O(2max); a running test to determine the lactate threshold (LT); a 5min control run at LT ...
Hayashi Keiji - - 2012
To examine the effect of menstrual cycle on the ventilatory sensitivity to rising body temperature, ten healthy women exercised for ~60 min on a cycle ergometer at 50% of peak oxygen uptake during the follicular and luteal phases of their cycle. Esophageal temperature, mean skin temperature, mean body temperature, minute ...
Pessoa Filho D M - - 2012
The purpose of this study was to describe the VO2 kinetics above and below respiratory compensation point (RCP) during swimming. After determination of the gas-exchange threshold (GET), RCP and VO2max, 9 well-trained swimmers (21.0±7.1 year, VO2max=57.9±5.1 ml.kg - 1.min - 1), completed a series of "square-wave" swimming transitions to a ...
Bonacci Jason - - 2012
OBJECTIVES: To determine which commonly measured variables of cycling intensity are related to subsequent running economy in triathletes. DESIGN: Cross-sectional laboratory study. METHODS: Running economy was compared between a control run (no preceding cycle) and a run performed after a 45min high-intensity cycle in eighteen triathletes. Power output, heart rate, ...
Roman Michael A - - 2012
Dead space to tidal volume ratio (V (D)/V (T)), a measure of pulmonary gas exchange efficiency, cannot be accurately calculated without arterial blood sampling. We sought to determine, in patients presenting for diagnostic cardiopulmonary exercise tests, whether there are ranges of the ratio of exhaled ventilation to carbon dioxide output ...
Silva R F - - 2012
The aim of the present study was to compare the effects of using different intensities and types of aerobic exercise (i. e., cycle ergometer or running) during concurrent training on neuromuscular adaptations. A total of 44 young women were randomly assigned to 1 of 4 groups: concurrent strength and continuous ...
Gordon Dan - - 2012
The purpose of this study was to determine the effect of exercise modality on the incidence of plateau at V·O2max. Twelve recreationally active men (age, 21·7 ± 2·3 year; mass, 74·8 ± 6·5 kg; height, 177·6 ± 5·6 cm) completed four incremental tests to volitional exhaustion, of which two were completed on a treadmill (TRE) and two were ...
McNarry Melitta A - - 2012
The influence of training status on pulmonary VO2 recovery kinetics, and its interaction with maturity, has not been investigated in young girls. Sixteen prepubertal (Pre: trained (T, 11.4 ± 0.7 years), 8 untrained (UT, 11.5 ± 0.6 years)) and 8 pubertal (Pub: 8T, 14.2 ± 0.7 years; 8 UT, 14.5 ...
Dolbow David R DR Spinal Cord Injury and Disorders Center, McGuire VAMC, Richmond, VA 23249, USA. - - 2012
Sedentarism is common among people with spinal cord injury (SCI). However, new technologies such as functional electrical stimulation cycles with internet connectivity may provide incentive by removing some of the limitations and external barriers. To determine the effectiveness of a long-term home-based functional electrical stimulation lower extremities cycling (FES-LEC) program ...
Zoladz Jerzy A - - 2012
The effect of maximal voluntary isometric strength training of knee extensor muscles on pulmonary V'O(2) on-kinetics, the O(2) cost of cycling and peak oxygen uptake (V'O(2peak)) in humans was studied. Seven healthy males (mean ± SD, age 22.3 ± 2.0 years, body weight 75.0 ± 9.2 kg, V'O(2peak) 49.5 ± 3.8 ml kg(-1) min(-1)) performed maximal isometric strength training lasting 7 weeks (4 sessions ...
Strohacker Kelley - - 2012
High-fat meals promote transient increases in proatherogenic factors, implicating the postprandial state in cardiovascular disease (CVD) progression. Although low-grade inflammation is associated with CVD, little research has assessed postprandial inflammation. Because of its anti-inflammatory properties, premeal exercise may counteract postprandial inflammation. The purpose of this study was to determine postprandial ...
Oosthuyse Tanja - - 2012
Whole body vibration (WBV) training has previously improved muscle power in various athletic groups requiring explosive muscle contractions. To evaluate the benefit of including WBV as a training adjunct for improving aerobic and anaerobic cycling performance, road cyclists (n=9) performed 3 weekly, 10 min sessions of intermittent WBV on synchronous ...
Hamzaid Nur Azah - - 2012
BACKGROUND: The cardiorespiratory responses and mechanical efficiencies of two modalities of functional electrical stimulation augmented leg exercises - isokinetic cycling and isokinetic elliptical stepping - were compared amongst individuals with spinal cord injury. METHODS: Five subjects performed seated isokinetic evoked cycling and elliptical stepping leg exercise at 10, 20 and ...
Fowler Robin M - - 2012
Background: Exercise-induced pulmonary arterial hypertension (EIPAH) is associated with reduced exercise capacity and abnormal central haemodynamic responses to maximal aerobic exercise. Aerobic and resistance exercise training are commonly employed to treat reduced exercise capacity; however, the haemodynamic response to aerobic and resistance exercise, at training intensities, in subjects with EIPAH ...
Ishii Kei - - 2012
Whether neurogenic vasodilatation contributes to exercise hyperemia is still controversial. Blood flow to noncontracting muscle, however, is chiefly regulated by a neural mechanism. Although vasodilatation in the nonexercising limb was shown at the onset of exercise, it was unclear whether central command or muscle mechanoreflex is responsible for the vasodilatation. ...
Mainguy Vincent - - 2012
Cardioselective β blockers are considered to have little impact on lung function at rest in patients with chronic obstructive pulmonary disease (COPD). However, their effects on dynamic hyperinflation, an important mechanism contributing to symptoms and exercise tolerance in patients with COPD, have not been evaluated. Twenty-seven patients with moderate to ...
Wadden Katie P - - 2012
The purpose of this study was to investigate underlying mechanisms and neuromuscular recovery patterns following rapid and slow stretch-shortening cycle (SSC) movements performed to fatigue. Fourteen (10 moderately trained (MT) and four highly trained (HT)) subjects completed rapid and slow SSC movements to fatigue. The rapid SSC movement consisted of ...
Sperlich Billy - - 2012
Abstract We test the hypothesis that breathing oxygen-enriched air (F(I)O(2) = 100%) maintains exercise performance and reduces fatigue during intervals of maximal-intensity cycling. Ten well-trained male cyclists (age 25 ± 3 years; peak oxygen uptake 64.8 ± 6.2 ml · kg(-1) · min(-1); mean ± s) were exposed to either hyperoxic or normoxic air during the 6-min intervals between ...
Rowlands David S - - 2012
When ingested at high rates (1.8-2.4 g·min(-1)) in concentrated solutions, carbohydrates absorbed by multiple (e.g., fructose and glucose) vs. single intestinal transporters can increase exogenous carbohydrate oxidation and endurance performance, but their effect when ingested at lower, more realistic, rates during intermittent high-intensity endurance competition and trials is unknown. Trained cyclists ...
Dalleck Lance C - - 2012
The aim of the present study was to test the utility of the verification testing procedure in confirming "true" VO(2)max in older adults completing maximal cycle ergometry. Eighteen physically active men and women (age = 59.7 ± 6.3 yr, ht = 173.0 ± 8.8 cm, body mass = 83.2 ± ...
Baker Julien S - - 2012
The aim of this study was to investigate differences in blood lactate accumulation following 10 and 20 sec of maximal cycle ergometer exercise. Body mass, stature, and age of the group was determined prior to testing (82.57 ± 5.94 kg 177 ± 5.94 cm and 21.42 ± 1.61 yrs, respectively). ...
Prieur F - - 2012
The aim of this study was to determine whether an increase in O2 availability induces an alteration of the balance between O2 consumption (ׁVO2) and O2 delivery (ׁQO2) at the muscle level. For that, we examined the effect of moderate hyperoxia on muscle deoxygenation kinetics at the onset of heavy-intensity ...
Vasilopoulou K M - - 2012
Exercise-induced dynamic hyperinflation and large intrathoracic pressure swings may compromise the normal increase in cardiac output (Q) in Chronic Obstructive Pulmonary Disease (COPD). Therefore, it is anticipated that the greater the disease severity, the greater would be the impairment in cardiac output during exercise. Eighty COPD patients (20 at each ...
Reger M - - 2012
Exercise efficiency at low power outputs, energetically comparable to daily living activities, can be influenced by homeostatic perturbations (e.g., weight gain/loss). However, an appropriate efficiency calculation for low power outputs used in these studies has not been determined. Fifteen active subjects (seven females, eight males) performed 14, 5-min cycling trials: ...
Lin Pei-Yi - - 2012
Stroke survivors suffering from deficits in motor control typically have limited functional abilities, which could result in poor quality of life. Cycling exercise is a common training paradigm for restoring locomotion rhythm in patients. The provision of speed feedback has been used to facilitate the learning of controlled cycling performance ...
Mendelson M - - 2012
AIM: To verify whether exercise intensities at the crossover point (COP) and maximal lipid oxidation (Lipox(max)) can be used interchangeably regardless of exercise mode, this study compared COP, Lipox(max) and maximal fat oxidation rate (MFO) obtained during two modes of submaximal metabolic exercise tests: stationary cycling under laboratory conditions and ...
Sperlich Billy - - 2012
The aims of the present study were to characterize the effects of cycling in varying terrain with the assistance of an electric motor with respect to (1) power output, velocity, and electromyography (EMG) signals; (2) cardiorespiratory parameters; (3) energy expenditure (EE); (4) rate of perceived exertion (RPE) and enjoyment and ...
Guenette Jordan A - - 2012
We describe the case of an 86-year-old woman with advanced obstructive lung disease (forced expiratory volume in 1s/forced vital capacity ratio (FEV(1)/FVC)=34%) who remains capable of superior athletic performance. Detailed pulmonary function testing was performed to characterize this patient's baseline respiratory impairment. An incremental symptom limited cycle exercise test was ...
Racinais Sébastien - - 2012
Baseline, postexercise (20 min cycling) and postexhaustion (incremental test) neuromuscular function was assessed in control (24°C) and hot (40°C) conditions. Heat affects the plantar flexors and knee extensors differently, but most of the effects of heat (e.g., M-wave decrement) and fatigue (e.g., voluntary activation and H-reflex decrement) were independent of each ...
Sih B - - 2012
To address the limitations of regression-based performance models, the literature describes a fatigue model that reduces the complexities of motor unit activation into a set of first-order differential equations requiring only a few parameters to capture the global effects of activation physiology (M 0: maximal force-generating capacity, F: fatigue rate, ...
Birk Gurpreet K - - 2012
Lower limb exercise increases upper limb conduit artery blood flow and shear stress, and leg exercise training can enhance upper limb vascular function. We therefore examined the contribution of shear stress to changes in vascular function in the nonexercising upper limbs in response to lower limb cycling exercise training. Initially, ...
Mendham Amy E - - 2012
This study investigated the acute effects of two exercise modes, including cycle ergometry and modified rugby on inflammation and glucose regulation within an Indigenous Australian population. Ten sedentary, untrained Indigenous male participants volunteered to participate and were not clinically diagnosed with cardiovascular or metabolic disorders. Following baseline testing and in ...
Sliwicka Ewa - - 2012
The purpose of the study was to examine the effects of sport training on carbohydrate metabolic indices and adipokines concentrations in young male triathletes (n=10). Athletes performed the incremental running test in two periods of the training cycle: in the transitory and preparatory phases. In both analyzed terms, physical exercise ...
Jin Hong - - 2012
Purpose: To evaluate the effect of aerobic cycling training with lower limb weights on cardiovascular fitness (peak VO(2)) and walking ability in chronic stroke survivors, and to investigate the relationship between changes in these parameters. Methods: 133 Chinese patients with chronic hemiparetic stroke (mean age 58 years) were randomized to ...
Driss Tarak - - 2012
The importance of maximal voluntary torque (T (MVC)), maximal rate of torque development (MRTD) and musculo-tendinous stiffness of the triceps surae for maximal power output on a cycle ergometre (P (max)) was studied in 21 healthy subjects by studying the relationships between maximal cycling power related to body mass (P ...
Gołębiowski Tomasz - - 2012
Aim: The aim of the present study was to evaluate the influence of cycle exercise during hemodialysis (HD) on patients' physical proficiency, muscle strength, quality of life and selected laboratory parameters. Patients and Methods: In a group of 29 (15 female, 14 male) HD patients (age 64.2 ± 13.1 years), ...
Seo Dong-Il - - 2012
Human ultra-weak photon emission (UPE) is related to the activity of respiratory chain and oxygen consumption. Investigations on UPE and its response to exercise are almost non existent. Since human UPE is an indicator of reactive oxygen species (ROS) levels, we used exercises as a model to study UPE. To ...
Brughelli Matt - - 2012
The purpose of this study was to determine the reliability of power outputs during maximal-intensity eccentric cycling over short durations (i.e. eccentric sprint cycling) on a "motor-driven" isokinetic ergometer. Fourteen physically active male subjects performed isokinetic eccentric cycling sprints at 40, 60, 80, 100 and 120 revolutions per minute (rpm) ...
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