Search Results
Results 301 - 350 of 978
< 2 3 4 5 6 7 8 9 10 11 12 >
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 A - - 2012
Variability in severity and progression of Parkinsons 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, ...
Goldfield Gary S - - 2012
OBJECTIVES: To evaluate effects of stationary cycling to music versus interactive video game cycling on psychosocial functioning in obese adolescents. METHODS: 30 obese adolescents aged 12-17 years were randomized to twice weekly laboratory-based sessions of stationary cycling to music or interactive video game cycling for a 10-week trial. Participant's self-reported ...
Boushel Robert - - 2012
Muscle mitochondrial respiratory capacity measured ex-vivo provides a physiological reference to assess cellular oxidative capacity as a component in the oxygen cascade in-vivo. In this review, the magnitude of muscle blood flow and oxygen uptake during exercise involving a small-to-large fraction of the body mass will be discussed in relation ...
Gonzales Joaquin U - - 2012
Previous studies have demonstrated that carbonic anhydrase inhibition with acetazolamide reduces exercise capacity. The mechanism responsible for this early fatigue is unclear, but may be partly mediated by impaired respiratory muscle function. Inspiratory muscle strength and endurance were assessed in seven healthy men (age 28±5 yrs,±SD) by measuring maximal inspiratory ...
Peñailillo Luis - - 2012
To better understand characteristics of neuromuscular fatigue in supramaximal cycling exercise, this study examined changes in surface electromyography (sEMG) frequency during maximal voluntary isometric contractions (MVC) following a 30-s Wingate anaerobic test (WAnT) using discrete wavelet transform (DWT). The changes in sEMG were also compared between DWT and mean frequency ...
Haile Luke - - 2012
The purpose of this investigation was to describe the just noticeable difference (JND) in perceived exertion during cycle exercise. Males (n = 20) and females (n = 26) (21.4 ± 3.1 year) performed load-incremented cycle exercise to peak intensity. At the end of each minute, subjects rated their overall-body perceived exertion using the OMNI (0-10) rating of ...
McLean Blake D - - 2012
The purpose of this study was to investigate how maximal power output (PMAX), as measured via the inertial load cycling technique, changes throughout a collegiate soccer season in relation to training load completed. The current investigation took place throughout the 2010 Big XII soccer season. Nineteen Division I female collegiate ...
Joyce Sarah - - 2012
ABSTRACT: We examined the effect of long-term oral contraceptive (OC) use on endurance performance in recreationally-active women. Eight women using OC (OC group) and eight women who were non-users (CON group) performed a test to determine peak oxygen uptake for cycling (V[Combining Dot Above]O2peak) and estimate the anaerobic threshold (AT). ...
Driller Matthew W - - 2012
PURPOSE: Compression garments have been commonly used in a medical setting as a method to promote blood flow. Increases in blood flow during exercise may aid in the delivery of oxygen to the exercising muscles and subsequently, enhance performance. The aim of the current study was to investigate the effect ...
Higgins Linda W LW Schools of Medicine and Nursing, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA. - - 2013
Prescribing exercise at intensities that improve fitness is difficult in children with cystic fibrosis (CF) due to ventilatory limitations and fluctuating health status. Our aim was to determine if children with CF could regulate the intensity of cycle ergometer and treadmill exercise using target ratings of perceived exertion (RPE) derived ...
Stemplewski Rafal - - 2012
The aim of the study was to compare the effect of exercise on postural control (PC) among the elderly with lower or higher level of habitual physical activity (HPA). The study involved 17 elderly men (mean age 72.9 ± 4.79 years). Mean velocity of the center of pressure (COP) displacements ...
Beaven Christopher Martyn - - 2012
Repeated cycles of vascular occlusion followed by reperfusion initiate a protective mechanism that acts to mitigate future cell injury. Such ischemic episodes are known to improve vasodilation, oxygen utilization, muscle function, and have been demonstrated to enhance exercise performance. Thus, the use of occlusion cuffs represents a novel intervention that ...
Hirschhorn Andrew D AD Westmead Private Physiotherapy Services, NSW, Australia. - - 2012
The purpose of this study was to compare the effectiveness of moderate-intensity stationary cycling and walking exercise programmes in the early postoperative period after first-time coronary artery bypass graft surgery. In this prospective trial, 64 patients (57 men, 7 women, mean age = 66 ± 9 years) performed twice daily, ...
Bachasson Damien - - 2012
OBJECTIVE: To assess quadriceps strength and fatigability by using femoral nerve magnetic stimulation (FNMS) and its relationship with exercise capacity in patients with fibromyalgia syndrome (FMS) and healthy controls. METHODS: 22 women (11 FMS, 11 controls) performed a maximal incremental cycling test and a quadriceps fatigue test on two separated ...
Demachi Koichi - - 2012
To clarify the influence of internal and skin temperature on the active cutaneous vasodilation during exercise, the body temperature thresholds for the onset of active vasodilation during light or moderate exercise under different ambient temperature conditions were compared. Seven male subjects performed 30 min of a cycling exercise at 20 % or ...
Kurayama Taichi - - 2012
BACKGROUND: Trainings of the kneeling position, such as standing exercise on the knees and kneeling gait, have been anecdotally used in physical therapy to improve postural control of patients with various pathological conditions. However, clinical evidence is lacking and the movement characteristics of these kneeling trainings have not been well ...
Aziz Abdul Rashid - - 2012
This study examines the effects of Ramadan fasting on performance during an intense exercise session performed at three different times of the day, i.e., 08:00, 18:00, and 21:00 h. The purpose was to determine the optimal time of the day to perform an acute high-intensity interval exercise during the Ramadan fasting ...
Faulkner Steve H - - 2012
PURPOSE: This study aimed to determine the effect of passive insulation versus external heating during recovery following a sprint specific warm up on thigh muscle temperature and subsequent maximal sprint performance. METHODS: On three separate occasions, 11 male cyclists (age 24.7 ± 4.2 years, height 1.82 ± 0.72m, body mass ...
Elmer Steven J - - 2012
Eccentric cycling serves a useful exercise modality in clinical, research, and sport training settings. However, several constraints can make it difficult to utilize commercially available eccentric cycle ergometers. In this technical note, we describe the process by which we built an isokinetic eccentric cycle ergometer using exercise equipment modified with ...
Baig Dur-E-Zehra - - 2012
The aim of this paper is to develop estimator that can predict oxygen consumption (V(O2)) during cycling and rowing exercises, by using non-invasive and easily measurable quantities such as heart rate (HR), respiratory rate (RespR) and frequency of exercising activity. The frequency of exercise is quantified as a universal measure ...
Sugita Norihiro - - 2012
A cycling wheel chair (CWC) is a useful tool to provide physical exercise for patients who face difficulty walking, caused by stroke or other brain disorders. A system has been developed for rehabilitation, which allows patients to practice driving a CWC in a virtual environment. In this study, hardware improvements ...
Nagata T - - 2012
The goal of this study is to maintain a continuous level of exercise intensity around the aerobic threshold (AT) during riding on an electric motor assisted bicycle using a new control system of electrical motor assistance which uses the efficient pedaling rate of popular bicycles. Five male subjects participated in ...
< 2 3 4 5 6 7 8 9 10 11 12 >