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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) ...
Dolan Lianne B - - 2012
PURPOSE: To determine which mode of exercise is preferred by breast cancer survivors and to evaluate this response between graded exercise testing on a treadmill and on a cycle ergometer. METHODS: Twelve breast cancer survivors completed 2 maximal aerobic stress tests on separate days. The women completed a ramp protocol ...
Buscemi S - - 2012
A well known problem in conventional cycling crank systems is the pedalling dead spot when the crank arms are in vertical position. The pedalling dead spot mitigates the power output during the propulsion phase of pedalling. The aim of this study was to verify the effects of a new design ...
Avelar Núbia C P - - 2012
The purpose of this study was to compare the effects of passive warm-up (PW), whole-body vibration (WBV), and control (C) on high-intensity performance during sprint cycle exercise. Six recreationally trained men performed a 30-seconds sprint cycle test after the three aforementioned conditions; each test was carried out on a different ...
Zainuldin Rahizan - - 2012
OBJECTIVE: This study determined the intensity of walking exercise prescribed from 70% of peak speed achieved during the incremental shuttle walk test (ISWT) in people with chronic obstructive pulmonary disease and whether a steady-state response was achieved when exercising at this intensity. DESIGN: Each participant performed lung function tests, an ...
Kennedy Jill M - - 2012
The purpose of this study was to determine if healthy young women of various aerobic fitness levels are vulnerable to intrapulmonary arteriovenous shunts (IPAVS) at sub maximal work rates. Female volunteers (n=24) performed semi-recumbent cycling exercise to exhaustion and agitated saline contrast echocardiography was used to determine the presence of ...
Roberts Justin D - - 2012
The purpose of this study was to undertake an independent investigation into the effects of ingesting a carbohydrate-protein-electrolyte (CPE) beverage on repeated submaximal and time-trial cycling performance. Sixteen recreationally trained males (height: 1.76 ± 0.07 m; weight: 70.05 ± 7.90 kg; VO2max: 49.69 ± 4.19 ml.kg-1.min-1) performed two exercise trials ...
Yung Marcus - - 2012
Trends in industry are leaning towards jobs that are more stereotyped at lower workloads. Physical variation is a potential ergonomic intervention. However, little is known of physiological response to different kinds of variation. To investigate this issue, three kinds of isometric contraction patterns with the same mean amplitude, cycle time, ...
Liang Michael T C - - 2012
The purpose of this study is to determine whether Panax Notoginseng (PNG) taken for 3 days and one 30-min cycling exercise can reduce postprandial hyperglycemia after ingesting a 75-mg oral glucose solution (OGTT) in untrained non-diabetic men, age 20-45 years. We randomly assigned 52 men to: 1) ginseng (G) + ...
Harrington Ann Tokay - - 2012
Introduction. Adolescents with cerebral palsy (CP) often have difficulty participating in exercise at intensities necessary to improve cardiovascular fitness. Functional electrical stimulation- (FES-) assisted cycling is proposed as a form of exercise for adolescents with CP. The aims of this paper were to adapt methods and assess the feasibility of ...
Nieman David C - - 2012
This study compared the acute effect of ingesting bananas (BAN) versus a 6% carbohydrate drink (CHO) on 75-km cycling performance and post-exercise inflammation, oxidative stress, and innate immune function using traditional and metabolomics-based profiling. Trained cyclists (N = 14) completed two 75-km cycling time trials (randomized, crossover) while ingesting BAN or CHO ...
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