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Results 351 - 400 of 1209
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Wang Yong-Chun - - 2011
We have shown previously that combined short-arm centrifuge and aerobic exercise training preserved several physiologically important cardiovascular functions in humans. We hypothesized that artificial gravity (AG) and exercise is effective to prevent changes of physical problems during head-down bed rest (HDBR). To test this hypothesis, 12 healthy male subjects had ...
Matsumoto Aya - - 2011
BACKGROUND: The molecular mechanisms of exercise training induced cardiovascular protection are poorly understood. There is growing evidence that reactive oxygen species may be involved in a number of these adaptations and that antioxidants may be used to investigate this effect. OBJECTIVE: To determine the effects of exercise training and/or antioxidant ...
Mielke Michelle - - 2011
Mielke, M, Housh, TJ, Hendrix, CR, Zuniga, J, Camic, CL, Schmidt, RJ, and Johnson, GO. A test for determining critical heart rate using the critical power model. J Strength Cond Res 25(2): 504-510, 2011-The purposes of this study were to (a) determine if the mathematical model that has previously been ...
Sardinha Aline - - 2011
Psychological factors such as stress and depression have already been established as primary and secondary cardiovascular risk factors. More recently, the role of anxiety in increasing cardiac risk has also been studied. The underlying mechanisms of increased cardiac risk in panic disorder patients seem to reflect the direct and indirect ...
Bunker Derek J - - 2011
Bunker, DJ, Rhea, MR, Simons, T, and Marin, PJ. The use of whole-body vibration as a golf warm-up. J Strength Cond Res 25(2): 293-297, 2011-The purpose of this case series was to test the effectiveness of an active warm-up for recreational golfers using a whole-body vibration (WBV) platform. The variables ...
Borjesson Mats - - 2011
Regular aerobic exercise at moderate intensities and an increased physical fitness are associated with a reduced risk of fatal and nonfatal coronary events in middle-aged individuals. In contrast, moderate and vigorous physical exertion is associated with an increased risk for cardiac events, including sudden cardiac death in individuals harbouring cardiovascular ...
Meziri Fayçal - - 2011
Chronic administration of recombinant human erythropoietin (rHuEPO) can generate serious cardiovascular side effects such as arterial hypertension (HTA) in clinical and sport fields. It is hypothesized that nitric oxide (NO) can protect from noxious cardiovascular effects induced by chronic administration of rHuEPO. On this base, we studied the cardiovascular effects ...
Miller Lindsay A - - 2011
Exercise has been shown to have positive effects on the brain and cognition in healthy older adults, though no study has directly examined possible cognitive benefits of formal exercise programs in persons with mild cognitive impairment (MCI) living in structured facilities. Thirty-one participants completed neuropsychological testing and measures of cardiovascular ...
Alves F H F - - 2011
Dynamic exercise evokes sustained blood pressure and heart rate (HR) increases. Although it is well accepted that there is a CNS mediation of cardiovascular adjustments during dynamic exercise, information on the role of specific CNS structures is still limited. The bed nucleus of the stria terminalis (BST) is involved in ...
Kuys Suzanne S - - 2011
Does exercise using a gaming console result in similar cardiovascular demand and energy expenditure as formally prescribed exercise in adults with cystic fibrosis? How do these patients perceive gaming console exercise? Randomised cross-over trial with concealed allocation and intention-to-treat analysis. 19 adults with cystic fibrosis admitted to hospital for treatment ...
Jouris Kelly B KB Doisy College of Health Sciences, Department of Nutrition and Dietetics, Saint Louis University , St. Louis, MO, - - 2011
Omega-3 fatty acids (omega-3) have anti-inflammatory properties. However, it is not known if omega-3 supplementation attenuates exercise-induced inflammation. We tested the hypothesis that omega-3 supplementation reduces inflammation that is induced by eccentric arm curl exercise. Healthy adult men and women (n=11; 35 ± 10 y) performed eccentric biceps curls on ...
Gear William S WS Department of Health, Physical Education and Recreation, University of Minnesota Duluth , Duluth, MN, - - 2011
There is little information available regarding how proprioceptive abilities decline as the amount of exertion increases during exercise. The purpose of this study was to determine the role of different levels of fatigue on knee joint position sense. A repeated measures design was used to examine changes in active joint ...
Pandey Vinod K VK Department of Electrical Engineering, Indian Institute of Technology Bombay, Powai Mumbai, 400 076, Maharashtra, India. - - 2011
Impedance cardiography is a noninvasive technique, based on sensing the variation in the electrical impedance of the thorax caused by variation in the blood volume during the cardiac cycle, for monitoring the stroke volume and some other cardiovascular indices. Respiratory and motion artifacts cause baseline drift in the sensed impedance ...
Farinatti Paulo T V - - 2011
The respiratory pattern is often modified or even blocked during flexibility exercises, but little is known about the cardiovascular response to concomitant stretching and the Valsalva maneuver (VM) in healthy subjects. This study evaluated the heart rate (HR), systolic blood pressure (SBP), and rate-pressure product (RPP) during and after large ...
May Linda - - 2011
Current studies intimate the fetal cardiovascular and respiratory systems benefit from exercise throughout pregnancy. These changes persist after birth suggesting that exercise exposure has long-term health benefits lasting into adulthood. Individuals exposed to exercise in utero show no signs of cardiovascular disease (CVD) as adults. Considering the pandemic of CVD ...
Witkowski Sarah - - 2010
The discovery of circulating angiogenic cells (CACs) with cardiovascular regenerative potential has transformed our understanding of the health and maintenance of cardiovascular tissues. We will describe the influence of acute exercise and exercise training on CAC characteristics and evidence for mechanisms that may be important in the optimization of CAC ...
Liang Nan - - 2011
To examine whether central command contributes differently to the cardiovascular responses during voluntary static exercise engaged by different muscle groups, we encouraged healthy subjects to perform voluntary and electrically evoked involuntary static exercise of ankle dorsal and plantar flexion. Each exercise was conducted with 25% of the maximum voluntary force ...
Mastelari Rosiane Batista - - 2010
It is well known that regular physical exercise alter cardiac function and autonomic modulation of heart rate variability (HRV). The paraventricular nucleus of hypothalamus (PVN) is an important site of integration for autonomic and cardiovascular responses, where nitric oxide (NO) plays an important role. The aim of our study was ...
Cochrane D J - - 2011
The aim of this review was to examine the physiological effects of vibration exercise (VbX), including the cardiovascular indices and to elucidate its potential use for those with compromised health. VbX has long been acknowledged as a potential modality in sport, exercise, and health sectors. Muscle force and power have ...
Bonitch-Domínguez Juan - - 2010
Eleven male judoka, who compete at national level, were recruited with the aim of investigating changes in peak leg power as a result of successive judo bouts and their relationship with lactate production. The participants executed a force-velocity curve to determine peak power in a 908 squat exercise in concentric ...
Fagundes Jaqueline Eilert - - 2010
Resting heart rate (which ranges from 60 to 80 bpm) is one of the simplest cardiovascular parameters, and has been considered as a predictor of cardiovascular and all-cause mortality. To determine the predictive value of resting heart rate (RHR) before exercise stress testing (ET) for cardiovascular (CV) and all-cause mortality. ...
Sacchetti Massimo - - 2010
We investigated the difference in the cadence-efficiency relationship between young and older competitive cyclists. Eight young (24.3 ± 5.3 yr) and eight older (65.6 ± 2.8 yr) competitive cyclists participated in two laboratory sessions. The first consisted of an incremental maximal cycling test to determine the freely chosen pedal cadence ...
Swaine I L - - 2010
The purpose of this study was to determine the reproducibility of limb power outputs and cardiopulmonary responses, to incremental whole-body exercise using a novel swimming training machine. 8 swimmers with a mean age of 23.7 ± 4.6 (yrs), stature 1.77 ± 0.13 (m) and body mass of 74.7 ± 2.8 ...
Lamont Linda S - - 2011
Purpose.?Wheelchair users are by necessity, limited to upper body exercise and have fewer exercise options. An ergometer found in many homes and fitness facilities can be simply adapted for use by those with lower extremity disabilities. This article outlines a novel modification using polyvinyl chloride(PVC) tubing to an existing exercise ...
Jones Andrew M - - 2010
For high-intensity muscular exercise, the time-to-exhaustion (t) increases as a predictable and hyperbolic function of decreasing power (P) or velocity (V ). This relationship is highly conserved across diverse species and different modes of exercise and is well described by two parameters: the "critical power" (CP or CV), which is ...
Stock Matt S - - 2010
The purpose of this study was to examine the relationships among mechanomyographic (MMG) amplitude, power output, and bar velocity during the free-weight bench press exercise. Twenty-one resistance-trained men [one-repetition maximum (1-RM) bench press = 125.4+18.4 kg] performed bench press muscle actions as explosively as possible from 10% to 90% of ...
Ryan Alice S - - 2010
The prevalence of overweight and obesity has increased dramatically over the last several decades. Obesity and physical inactivity increase the risk for cardiovascular disease, Type 2 diabetes mellitus, hypertension, dyslipidemia and certain cancers. Obesity and low levels of physical fitness are also associated with increased risk of all-cause and cardiovascular ...
Lim Allen C - - 2010
PURPOSE:: To compare the demands of a six-day stage race using field measures of power output and heart rate in male (n=8) and female (n=10) competitive cyclists. METHODS:: Heart rate and power output were monitored in males and females competing in separate races on identical courses including a prologue (4 ...
Koch Beate - - 2011
Testosterone exerts a widespread pattern of effects on metabolism and body composition, and interest is gaining in its correlation with physical fitness. The main focus of our study was to investigate the association of total serum testosterone and sex hormone-binding globulin (SHBG) levels on exercise capacity and maximal power output ...
Holsgaard-Larsen A - - 2010
A rowing ergometer can be placed on a slide to imitate 'on-water' rowing. The present study examines I) possible differences in biomechanical and physiological variables of ergometer rowing with and without slides and II) potential consequences on training load during exercise. 7 elite oars-women rowed in a randomized order in ...
Wasuntarawat Chanchira - - 2010
Thai ginseng, Kaempferia parviflora, is widely believed among the Mong hill tribe to reduce perceived effort and improve physical work capacity. Kaempferia parviflora is consumed before their daily work. Therefore, we conducted an acute study on the effects of K. parviflora on repeated bouts of sprint exercise and on endurance ...
Elmer Steven J - - 2010
Previous investigators have reported changes in maximal power after eccentric exercise. The influence of eccentric joint-specific power absorption on subsequent concentric joint-specific power production during multijoint actions has not been reported. Our purposes were to determine the extent to which ankle, knee, and hip joint actions absorbed power during eccentric ...
Kaya Defne - - 2010
McConnell recommended that patellar tape be kept on all day, until patients learn how to activate their vastus medialis obliquus (VMO) during an exercise program. This application may pose problems because prolonged taping may be inadvisable for some patients or even contraindicated owing to skin discomfort, irritation, or allergic reaction. ...
Francis James T JT Jr Robert Kertzer Exercise Physiology Laboratory, University of New Hampshire, Durham, NH, - - 2010
The purpose of this study was to develop a modified version of a 3-min all-out cycling test (3MT) using equipment readily available to cyclists and to identify exercise intensity domains using the average power output over the last 30 s of the 3MT (end-test power (EP)). Sixteen competitive cyclists (V(O2peak) ...
Elmer Steven J - - 2010
Previous investigators have reported velocity-dependent strength loss for single-joint actions following acute eccentric exercise. The extent to which velocity influences recovery of multi-joint function is not well documented. Our main purpose was to compare alterations in maximal cycling power produced across a range of pedaling rates following eccentric exercise. An ...
Rae Dale E - - 2010
We compared the cardiorespiratory response and muscle recruitment [as determined by electromyography (EMG)] of 37 McArdle patients [19 males, 37.4 ± 2.8 years, body mass index (BMI): 25.1 ± 4.7 kg m(-2)] and 33 healthy controls (18 males, 36.4 ± 10.0 years, BMI: 25.7 ± 3.8 kg m(-2)) during cycle-ergometer exercise (an incremental test to exhaustion and a 12-min submaximal constant workload test). ...
Smilios Ilias - - 2010
The purpose of this study was to examine (a) the mechanical power and the electromyographic (EMG) activity during a moderate load muscular endurance session and (b) the maximal mechanical power output and EMG activity using a light load and a heavy load afterward. Sixteen men (age: 20.7 +/- 1.1 years) ...
Robbins Daniel W - - 2010
The objective of this study was to investigate the acute effects of performing traditional set (TS) vs. complex set (CS) agonist-antagonist training over 3 consecutive sets, on bench press throw (BPT) throw height (TH), peak velocity (PV), peak power (PP), bench pull volume load (VL), and electromyographic (EMG) activity. Eighteen ...
Molis Marc A - - 2010
Exercise-induced bronchospasm (EIB) is a phenomenon of airway narrowing that occurs during or after exercise or physical exertion. This condition has been reported in a range of sporting activities but is most common in participants of cold-weather sports (eg, Nordic skiing) and indoor sports (eg, ice-skating and swimming). Traditionally, the ...
Fry A C - - 2010
This study examined the acute hormonal responses to a single high power resistance exercise training session. Four weight trained men (X +/- SD; age [yrs] = 24.5 +/- 2.9; hgt [m] = 1.82 + 0.05; BM [kg] = 96.9 +/- 10.6; I RM barbell squat [kg] = 129.3 +/- 17.4) ...
Mello Roger Gomes Tavares - - 2010
This work aims at testing the influence of peripheral and central fatigue, after maximal oxygen uptake test (Test1) and prolonged (Test2) cycle ergometer exercises, respectively, on sway density curve (SDC) parameters of postural control. Sixteen healthy male subjects were submitted to stabilometric tests, before and after the exercises. The Test1 ...
Samogin Lopes Felipe A - - 2010
This study analyzed the effect of an acute static stretching bout on the time to exhaustion (Tlim) at power output corresponding to VO2max. Eleven physically active male subjects (age 22.3+/-2.8 years, VO2max 2.7+/-0.5 L.min) completed an incremental cycle ergometer test, 2 muscle strength tests, and 2 maximal tests to exhaustion ...
Racinais Sebastien - - 2010
The present study was designed to investigate if the suggested greater fatigability during repeated exercise in the afternoon, compared to the morning, represents a true time-of-day effect on fatigability or a consequence of a higher initial power. In a counterbalanced order, eight subjects performed a repeated-sprint test [10 x (6 ...
Sperlich Billy - - 2010
Previous studies have indicated that aerobic pathways contribute to 13-27% of the energy consumed during short-term (10-20 s) sprinting exercise. Accordingly, the present investigation was designed to test the hypothesis that prior breathing of oxygen-enriched air (F(in)O(2) = 60%) would enhance power output and reduce fatigue during subsequent sprint cycling. ...
Mays Ryan J - - 2010
This investigation compared estimated and predicted peak oxygen consumption (VO2 peak) and maximal heart rate (HRmax) among the treadmill, cycle ergometer, and elliptical ergometer. Seventeen women (mean +/- SE: 21.9 +/- 0.3 y) exercised to exhaustion on all modalities. American College of Sports Medicine metabolic equations were used to estimate ...
Nuzzo James L - - 2010
The maximal dynamic output (MDO) hypothesis is a newly proposed concept, which suggests that the muscular system of the lower limbs is designed to produce maximal power output when performing countermovement vertical jumping (CMJ) at body mass as opposed to other loading conditions. However, it is unclear if the MDO ...
Bentley Jason R - - 2010
The purpose of this investigation was to determine the effect of different lifting cadences on the ground reaction force (GRF) during the squat exercise. Squats performed with greater acceleration will produce greater inertial forces; however, it is not well understood how different squat cadences affect GRF. The hypotheses were that ...
El Helou Nour - - 2010
Road cycling ranks among the most intense endurance exercises. Previous studies and mathematical models describing road cycling have not analysed performances per se. We describe the evolution of road cycling performance over the past 116 years. We studied the top ten cyclists' mean speeds in eight famous classic races and ...
Javierre C - - 2010
Physical exercise is often terminated not due to muscle fatigue but because of inadequate neural drive in the serotonergic system. Modifications in activity levels of the serotonergic system, induced by variations in the availability of L-tryptophan (a serotonin precursor) may alter neural drive. We examined the effect of L-tryptophan supplementation ...
Hirai D M - - 2010
This study investigated the effects of pedal frequency on the slow component of pulmonary oxygen uptake ( V O(2)) kinetics during heavy exercise at the same relative intensity. We hypothesized that higher pedal frequency (expected to enhance fast-twitch muscle fiber recruitment) would be associated with greater slow component amplitude (A' ...
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