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Results 301 - 350 of 999
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Driss Tarak - - 2013
The interests and limits of the different methods and protocols of maximal (anaerobic) power (P max) assessment are reviewed: single all-out tests versus force-velocity tests, isokinetic ergometers versus friction-loaded ergometers, measure of P max during the acceleration phase or at peak velocity. The effects of training, athletic practice, diet and ...
Sipavičienė Saulė - - 2013
The aim of this study was to investigate whether variation in estrogen levels during the menstrual cycle influences susceptibility to exercise-induced muscle damage after stretch-shortening cycle exercise. Physically active women (n = 18; age = 20.2 ± 1.7 yr) participated in this research. The subjects performed one session of 100 maximal ...
Billaut François - - 2013
To investigate the interaction between the development of peripheral locomotor muscle fatigue, muscle recruitment and performance during repeated-sprint exercise (RSE). In a single-blind, randomised and cross-over design, ten male team-sport athletes performed two RSE (fifteen 5-s cycling sprints interspersed with 25 s of rest; power self-selected) in normoxia and in ...
Bhandari Bharti - - 2013
Objectives: The present study was planned to assess the effects of gonadal steroids (estrogen and progesterone) on bronchial responsiveness, before and after handgrip exercise, during different phases of menstrual cycle. Materials and Methods:In this study, 30 healthy (25-40 years), non-athletic, adult female volunteers were studied. The various pulmonary function parameters ...
Bachasson Damien - - 2013
Exercise intolerance in COPD seems to combine abnormal ventilatory mechanics, impaired O2 transport and skeletal muscle dysfunction. However their relatie contribution and their influence on symptoms reported by patients remain to be clarified. In order to clarify the complex interaction between ventilatory and neuromuscular exercise limiting factors and symptoms, we ...
Goh Jorming J Interdisciplinary Program in Nutritional Sciences Medicine, University of Washington, Seattle, WA, - - 2013
Exercise training (ET) and physical activity (PA) offer obvious health benefits in regular participants. In pre-clinical animal models, treadmills and running wheels are the models of choice for intervention studies using ET and PA. However, the frequency and duration necessary for positive effects on health are not completely understood. We ...
Jepson Paul D PD Institute of Zoology, Zoological Society of London, Regent's Park, London, United Kingdom. - - 2013
On 9 June 2008, the UK's largest mass stranding event (MSE) of short-beaked common dolphins (Delphinus delphis) occurred in Falmouth Bay, Cornwall. At least 26 dolphins died, and a similar number was refloated/herded back to sea. On necropsy, all dolphins were in good nutritive status with empty stomachs and no ...
Sugita Norihiro N Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, - - 2013
Cycling is known to be an effective rehabilitation exercise for hemiplegic patients who face difficulty during walking because of stroke or other brain disorders. A cycling wheelchair (CWC) is a useful tool to provide exercise for these patients and improve their quality of life. In previous studies, our group developed ...
Chen Tsung-I TI Graduate Institute of Sport Science, National Taiwan Sport University, Taoyuan, Taiwan ; Center for Physical Education, Tzu Chi University, Hualien, - - 2013
To examine whether short-term, ie, five daily sessions, vigorous dynamic cycling exercise and heat exposure could achieve heat acclimation in trained athletes and the effect of heat acclimation on cutaneous blood flow in the active and nonactive limb. Fourteen male badminton and table tennis athletes (age = 19.6 ± 1.2 ...
Matsuse Hiroo H Division of Rehabilitation, Kurume University Hospital, 67 Asahi-machi, Kurume, Fukuoka, Japan. - - 2013
A hybrid training system (HTS) has been developed as the combined application of electrical stimulation (ES) and volitional contractions (VC), using electrically stimulated eccentric antagonist muscle contractions as a resistance to voluntary agonist muscle contractions. The purpose of the present study is to compare the metabolic cost between cycling exercise ...
Larson Rebecca D RD Department of Health and Exercise Science, University of Oklahoma, Norman, OK 73019, USA. - - 2013
Bilateral differences in lower-limb strength in people with multiple sclerosis (MS) have been clinically observed. The objectives of this study were to quantify bilateral differences in lower-limb performance and metabolism during exercise. Eight ambulatory individuals with mild MS with an Expanded Disability Status Scale score of 2.6 +/- 1.6 and ...
Siegler Jason C JC School of Science & Health, University of Western Sydney, Locked Bag 1797, Sydney, NSW 2751, - - 2013
The purpose of this study was to examine the efficacy of introducing a fish protein hydrolysate (PEP) concurrently with carbohydrate (CHO) and whey protein (PRO) on endurance exercise metabolism and performance. In a randomised, double blind crossover design, 12 male volunteers completed an initial familiarisation followed by three experimental trials. ...
Aoi Wataru W Laboratory of Health Science, Kyoto Prefectural University Kyoto, - - 2013
MicroRNAs (miRNAs) are small non-coding RNAs involved in post-transcriptional gene regulation. miRNAs are taken in by intracellular exosomes, secreted into circulation, and taken up by other cells, where they regulate cellular functions. We hypothesized that muscle-enriched miRNAs existing in circulation mediate beneficial metabolic responses induced by exercise. To test this ...
Rizk Amanda K AK Individualized Program, Concordia - - 2013
Pulmonary rehabilitation (PR) is an important component in the management of respiratory diseases. The effectiveness of PR is dependent upon adherence to exercise training recommendations. The study of exercise adherence is thus a key step towards the optimization of PR programs. To date, mostly indirect measures, such as rates of ...
Hasnan Nazirah - - 2012
PURPOSE: This study compared acute exercise responses during arm cranking, functional electrical stimulation (FES)-assisted leg cycling and combined arm and leg ("hybrid") cycling in individuals with spinal cord injury (SCI) during maximal and submaximal exercise. METHODS: Nine male subjects with long-standing neurological lesions from C7-T12 were recruited. All subjects performed ...
Laroche Davy - - 2012
OBJECTIVE: To assess the safety and acute effects of a procedure using perceived exertion during a prior submaximal concentric (CON) test to individualize eccentric (ECC) cycling exercise intensity. DESIGN: Prospective monocentric open study. SETTING: Technological Investigation Platform at the Physical Medicine and Rehabilitation Department, Dijon University Hospital. PARTICIPANTS: Eighteen healthy ...
Klopp Dawn Marie - - 2013
The study involved application of different applied loads to measure altered test durations, time to peak power, peak power, and peak cadence during intense cycle ergometry exercise. Healthy, physically active male (n = 11) and female (n = 11) subjects (18-45 years) performed the following 3 bouts of intense cycle ...
Kato Jo - - 2012
Background: Oscillatory breathing, alternating between hyperpnea and hypopnea, has been recognized in cardiac patients, especially in those with heart failure. We evaluated whether the cycle length and amplitude of oscillatory breathing correlate with impaired cardiopulmonary function during exercise. Methods and Results: We analyzed respiratory gas data during cardiopulmonary exercise testing (CPX) in ...
Turner Louise A - - 2012
The aim of this study was to determine the effect of inspiratory loading on limb locomotor (LM) and respiratory muscle (RM) deoxygenation ([deoxy (Hb+Mb)]) using NIRS during constant-power cycling exercise. Sixteen, male cyclists completed three, 6-min trials. The intensity of the first 3-min of each trial was equivalent to ∼80% ...
Leites Gabriela Tomedi GT Graduate Program in Human Movement Science, School of Physical Education, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil. - - 2013
To compare thermoregulatory and perceptual responses between lean and obese girls during and after exercise under heat (HC) and thermoneutral (TC) conditions. In a randomized order, 27 girls (14 lean [16.6 ± 6.7% fat and 9.1 ± 1.3 years] and 13 obese [41.3 ± 6.7% fat and 9.4 ± 1.1 ...
Olsen Olav - - 2012
The aim of the present study was to investigate the effect of warm-up and cool-down exercise on delayed onset of muscle soreness at the distal and central parts of rectus femoris following leg resistance exercise. Thirty-six volunteers (21 women, 15 men) were randomly assigned to the warm-up (20 min ergometer ...
Hansen Ernst A - - 2012
The authors tested whether heavy strength training, including hip-flexion exercise, would reduce the extent of the phase in the crank revolution where negative or retarding crank torque occurs. Negative torque normally occurs in the upstroke phase when the leg is lifted by flexing the hip. Eighteen well-trained cyclists either performed ...
Emanuele Umberto - - 2012
The main aim of this study was to compare the freely chosen cadence (FCC) and the cadence at which the blood lactate concentration at constant power output is minimized (optimal cadence [Copt]). The second aim was to examine the effect of a concomitant change of road incline and body position ...
Márk Váczi - - 2012
ABSTRACT: To determine the acute task- and stretch load-dependency of neuromuscular impairments after muscle-damaging exercise, we examined the magnitude of strength deficits in isometric and stretch-shortening cycle (SSC) contractions following a single bout of exercise. Ten trained males performed 90 unilateral isokinetic eccentric-concentric knee extensions on a dynamometer. Plasma creatine ...
Sidhu Simranjit K - - 2012
PURPOSE: In the current study, we measured EMG suppression induced by subthreshold transcranial magnetic stimulation (TMS) in order to investigate the effects of sustained cycling exercise on intracortical inhibition. METHODS: Sixteen subjects cycled at 75% of their maximum workload (Wmax) for 30 min, during which subthreshold TMS was applied at ...
Hayes Mark - - 2012
Abstract The aims of this study were to determine the reliability of an intermittent-sprint cycling protocol and to determine the efficacy of one practice session on main trials. Eleven men, moderately trained team-sport athletes, completed three visits to the laboratory involving a graded-exercise test and practice session and two trials ...
Wright Katherine E - - 2012
The authors of this study examined the effects of muscle fatigue on balance indices and recovery time in recreationally trained individuals after incremental tests on a treadmill and a cycle ergometer. Sixteen participants (male N = 11, female N = 5) (mean age = 21.2 ± 2 years) completed this study. Balance measures were performed on a Biodex Balance ...
Itoh Haruki - - 2012
BACKGROUND: The responses of heart rate (HR) and blood pressure to the ramp exercise test are not known and the current understanding of peak oxygen uptake and anaerobic threshold (AT) values in the normal Japanese population is insufficient. METHODS AND RESULTS: A total of 749 healthy Japanese subjects aged 20-78 ...
Singh Tarkeshwar T Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA. - - 2012
We investigated the effect of fatigue produced by timed maximal voluntary contraction (MVC) of the index finger of one of the hands on performance in MVC and accurate cyclic force production tasks in right-handed subjects. Based on earlier studies, we hypothesized that fatigue would produce an increase in the indices ...
Oliver Jonathan M - - 2012
PURPOSE: The purpose of this study was to determine the effects of creatine supplementation on blood lactate during incremental cycling exercise. METHODS: Thirteen male subjects (mean ± SD: 23 ± 2 years; 178.0 ± 8.1 cm; 86.3 ± 16.0 kg; 24 ± 9 % body fat) performed a maximal, incremental ...
Rupp Thomas - - 2013
Performing exercise during the first hours of hypoxic exposure is thought to exacerbate acute mountain sickness (AMS), but whether this is due to increased hypoxemia or other mechanisms associated with exercise remains unclear. In 12 healthy men, AMS symptoms were assessed during three 11-h experimental sessions: 1) in Hypoxia-exercise, inspiratory ...
Carter Howard H - - 2012
The impact of manipulating shear stress on conduit artery vasodilation has not been comprehensively described in vivo. We hypothesized that manipulation of SR through the brachial and radial arteries would be associated with corresponding changes in diameter. We performed a series of studies involving the following: (1) leg cycle exercise ...
Louis J - - 2012
The aim of this study was to investigate the physiological demands of Supercross BMX in elite athletes. Firstly athletes underwent an incremental cycling test to determine maximal oxygen uptake (VO2max) and power at ventilatory thresholds. In a second phase, athletes performed alone a simulated competition, consisting of 6 cycling races ...
Egaña Mikel - - 2012
PURPOSE: To examine the effect of the degree of inclination from upright to supine postures on cycling performance, fatigue and oxygen uptake (V˙O2) kinetics. METHODS: In experiment 1 ten subjects performed graded and fatigue (exhaustive constant-load heavy exercise with 10s all-out efforts interspersed every min) tests at four cycling postures: ...
van der Ende-Kastelijn Karin - - 2012
Background.- Primary exertional headache (PEH) is a long-known phenomenon. Divergent prevalences of between 0.2 and 12.3% are reported among the general population. The aim of this study was to establish the prevalence among an athletic population. Method.- A link to an online questionnaire was sent to all participants of a ...
Dolbow David R - - 2012
The typically sedentary spinal cord injured population has limited physical activity options because of muscle paralysis, difficulties in transportation, and barriers to access rehabilitation/wellness facilities. It is important to investigate physical activity alternatives to increase physical activity levels and decrease the risk of inactivity-derived diseases. The goal of this study ...
Logan-Sprenger Heather M - - 2012
This study investigated the effects of progressive mild dehydration during cycling on whole body substrate oxidation and skeletal muscle metabolism in recreationally active men. Subjects (n=9) cycled for 120 min at ~65% VO2peak (22.7°C, 32% RH) with water to replace sweat losses (HYD) or without fluid (DEH). Blood samples were ...
Schneider Stefan - - 2012
Despite modern imaging techniques, assessing and localizing changes in brain activity during whole-body exercise is still challenging. Using an active electroencephalography (EEG) system in combination with source localization algorithms, this study aimed to localize brain cortical oscillations patterns in the motor cortex and to correlate these with surface electromyography (EMG)-detected ...
Ridgel Angela L AL Department of Exercise Science, Kent State University, Kent, OH 44242, - - 2013
Variability in severity and progression of Parkinson's disease symptoms makes it challenging to design therapy interventions that provide maximal benefit. Previous studies showed that forced cycling, at greater pedaling rates, results in greater improvements in motor function than voluntary cycling. The precise mechanism for differences in function following exercise is ...
Peart Daniel J - - 2012
The aim of this study was to observe the intracellular heat shock protein 72 (HSP72) and heme oxygenase-1 (HSP32) response to prolonged interval cycling following the ingestion of carbohydrates (CHO) and sodium bicarbonate (NaHCO(3)). Six recreationally active males (mean ± SD; age 23.2 ± 2.9 years, height 179.5 ± 5.5 cm, body mass 76.5 ± 6.8 kg, and peak power output ...
Paradiso M - - 2012
The heart rate can be effectively used as a measure of the exercise intensity during long duration cycle-ergometer exercises: precisely controlling the heart rate becomes crucial especially for athletes or patients with cardiovascular/obesity problems. The aim of this letter is to experimentally show how the non-local and non-switching nonlinear control ...
Noordhof Dionne A - - 2012
PURPOSE: The purpose of this study was to test the assumption that gross efficiency (GE) at sea level (SL) is representative of GE at altitude (AL). It was hypothesized that an increased cost of ventilation and heart rate, combined with a higher respiratory exchange ratio (RER) at AL might result ...
Stöggl T - - 2012
To determine the relationship of muscle activation, force production, and cycle characteristics to O(2) extraction during high- and lower-intensity double poling (DP), nine well-trained male cross-country skiers performed DP on a treadmill for 3 min at 90% VO(2peak) followed by 6 min at 70%. During the final minute at each workload, arterial, ...
Baldari C - - 2012
The Cosmed AquaTrainer® snorkel, in connection with the K4b2 analyzer, is the most recent instrument used for real time gas analysis during swimming. This study aimed to test if a new AquaTrainer® snorkel with 2 (SV2) or 4 (SV4) valves is comparable to a standard face mask (Mask) being valid ...
McNamara John M - - 2012
ABSTRACT: Although there is considerable research on concurrent training, none has integrated flexible nonlinear periodization and maximal effort cycling in the same design. The purpose of this investigation was to test outcome measures of strength and power using a pretest-posttest randomized-groups design. A strength and endurance group (SE) was compared ...
Levels Koen - - 2012
PURPOSE: The best way to apply precooling for endurance exercise in the heat is still unclear. Therefore, we analyzed the effect of different preparation regimes on pacing during a 15-km cycling time trial in the heat. METHODS: Ten male subjects completed four 15-km time trials (30°C), preceded by different preparation ...
Zebrowska Aleksandra - - 2012
The physiological adaptation to training is specific to the muscle activity, dominant energy system involved, muscle groups trained, as well as intensity and volume of training. Despite increasing popularity of snowboarding only little scientific data is available on the physiological characteristics of female and male competitive snowboarders. Therefore, the purpose ...
Giles Luisa V - - 2012
Purpose: To determine the effect of pre-exercise exposure to diesel exhaust (DE) on 20-km cycling performance, pulmonary function, and cardio-respiratory variables during exercise. Methods: Eight endurance-trained males participated in the study. Test days consisted of a 60-min exposure to either filtered air (FA) or DE, followed by a 20 km ...
Mekjavic Igor B - - 2012
It has been speculated that short (-1-h) exposures to intermittent normobaric hypoxia at rest can enhance subsequent exercise performance. Thus, the present study investigated the effect of daily resting intermittent hypoxic exposures (IHE) on peak aerobic capacity and performance under both normoxic and hypoxic conditions. Eighteen subjects were equally assigned ...
Turmel Julie - - 2012
The importance of exercise-induced exaggerated blood pressure (BP) response in endurance athletes is not known. To assess the hemodynamic parameters and metabolic profile in athletes with an exaggerated BP response to exercise. Forty-four endurance athletes underwent a maximal exercise test, a 24-h ambulatory blood pressure monitoring, a 24-h Holter assessment, ...
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