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Guenette Jordan A - - 2012
Dynamic hyperinflation (DH) during exercise occurs in most but not all patients with advanced chronic obstructive pulmonary disease (COPD). It is not known whether the presence or absence of DH has implications for dyspnoea and exercise tolerance. Therefore, we compared detailed ventilatory and sensory responses to exercise in hyperinflators and ...
Fan Jui-Lin - - 2011
We tested the hypothesis that preventing the poikilocapnic response to high intensity exercise would increase the ventilatory response to exercise. We measured ventilatory variables in 10 healthy men during incremental cycling with and without inspired CO(2) (randomised order). Inspired CO(2) elevated resting ventilation (V˙(E)), tidal volume (V(T)), [Formula: see text] ...
Cunha Felipe A - - 2011
The accuracy of the American College of Sports Medicine (ACSM) equations for producing predicted values of heart rate reserve (HRR) and oxygen uptake reserve [Formula: see text] and consequently, target energy expenditure (EE) during exercise are yet to be established. This study investigated whether speeds defined by the ACSM metabolic ...
Nishiyasu Takeshi - - 2012
Our aim was to test the hypothesis that apnea-induced hemodynamic responses during dynamic exercise in humans differ between those who show strong bradycardia and those who show only mild bradycardia. After apnea-induced changes in heart rate (HR) were evaluated during dynamic exercise, 23 healthy subjects were selected and divided into ...
Vernillo Gianluca - - 2011
In this study, we observed the variations on physiological and perceptual variables during a self-paced 10,000-m race walking event with the aim to trace a preliminary performance profile of the distance. On fourteen male athletes, heart rate was monitored continuously throughout the event. The rating of perceived exertion was collected ...
Kemmler Wolfgang - - 2011
Kemmler, W, von Stengel, S, Schwarz, J, and Mayhew, JL. Effect of whole-body electromyostimulation on energy expenditure during exercise. J Strength Cond Res 26(1): 240-245, 2012-The application of whole-body electromyostimulation (WB-EMS) in the area of fat reduction and body shaping has become more popular recently. Indeed, some studies prove positive ...
Peveler Willard W - - 2011
Saddle height is one of the most researched areas of bike fit. The current accepted method for adjusting saddle height involves use of a goniometer to adjust saddle height so that a knee angle between 25° and 35° is obtained. This measurement is taken while the cyclist maintains a static ...
Vega Sandra Rojas - - 2011
Physical activity has an impact on several endocrine functions. During exercise certain endocrine adjustments are required to maintain the homeostasis. It is well known that depending on the intensity and duration, exercise stimulates the release of the hormone prolactin (PRL). After the cessation of acute exercise this effect persist and ...
Gonzalez Javier T - - 2011
The enhancement of fat oxidation during exercise is an aim for both recreational exercising individuals and endurance athletes. Nutritional status may explain a large part of the variation in maximal rates of fat oxidation during exercise. This review reveals novel insights into nutritional manipulation of substrate selection during exercise, explaining ...
Barwood Martin James - - 2011
AimInitial power output declines significantly during exercise in hot conditions on attaining a rapid increase in skin temperature when exercise commences. It is unclear whether this initial reduced power is mediated consciously, through thermal perceptual cues, or is a subconscious process. The authors tested the hypothesis that improved thermal perception ...
Jeppesen Tina D - - 2011
Oxygen (O(2)) extraction is impaired in exercising skeletal muscle of humans with mutations of mitochondrial DNA (mtDNA), but the muscle hemodynamic response to exercise has never been directly investigated. This study sought to examine the extent to which human skeletal muscle perfusion can increase without reductions in blood oxygenation and ...
Lorenzo Santiago - - 2011
INTRODUCTION: Although it has been reported that the work of breathing may be higher in women, inconsistencies among studies leaves this important question unresolved. Also, the association between the oxygen cost of breathing and rating of perceived breathlessness (RPB) during exercise has not been examined between women and men. PURPOSE: ...
Giordano Rose M - - 2011
Metabolites of the cytochrome P450 (CYP) pathway may contribute to vasodilation of the vasculature. However, it is not known whether exercise affects their circulating concentrations. The authors determined effects of exercise intensity and duration on plasma concentrations of epoxy and dihydroxy metabolites of arachidonic acid. Their goal was to delineate ...
Rosic Mirko - - 2011
This paper describes a new mathematical approach for the analysis of HR (heart rate) and BL (blood lactate) curves during incremental exercise testing using a HR/BL curve and its derivatives, taking into account the native shape of all curves, without any linear approximation. Using this approach the results indicate the ...
Sampson J A - - 2011
Heavy-load resistance exercise is not normally associated with stretch shortening muscle activation. Rapid lengthening, and a decreased period of time between lengthening and shortening phases of contraction (amortisation phase) has been associated with increased energy transfer from passive muscle structures (series elastic component, SEC), and gains in muscle efficiency during ...
Sun Feng-Hua - - 2011
The purpose of the present study was to investigate the effect of glycemic index (GI) and fructose content in lunch on substrate utilization during subsequent brisk walking. Ten healthy young males completed 3 main trials in a counterbalanced crossover design. They completed 60 min of brisk walking at approximately 50% maximal ...
Holmqvist L - - 2011
The aim of this prospective cohort study was to identify which blood pressure measurement during exercise is the best predictor of future hypertension. Further we aimed to create a risk chart to facilitate the evaluation of blood pressure reaction during exercise testing. A number (n=1047) of exercise tests by bicycle ...
Herrick Jeffrey E - - 2011
This study compared the metabolic and performance effects of riding front-only suspension (FS) and front-and-rear suspension (FRS) mountain bicycles on an off-road course that simulated competitive cross-country race conditions (>105 min in duration, with ∼70% of time spent riding uphill). Seven competitive mountain bikers (73.8 ± 7.6 kg; 61.0 ± ...
Barwood M J - - 2011
Fatigue occurs prematurely during exercise in hot conditions. The role of thermal perception in driving pacing has yet to be determined. We tested the hypothesis that improved thermal perception (feeling cooler and more comfortable) in the absence of changed thermal state, would alter pacing and improve time trial (TT) performance. ...
Patras K - - 2011
It has been demonstrated that the local neuromuscular response during high intensity exercise has a strong relationship with endurance markers. However, a diminished neuromuscular response has been reported for the operated leg in athletes having undergone anterior cruciate ligament reconstruction (ACLR). The purpose of the present study was to examine ...
Massidda Myosotis - - 2011
The aims of this study were to estimate the energy expenditure (EE) and the intensity of physical activity (PA) during a competitive simulation of Latin American dancing and to evaluate the differences in PA and EE values between the sexes, between different dance types, and between the various phases of ...
Galoza Pedro - - 2011
To compare the effect of inter-set cooling and no cooling during resistance exercise (RE) on the total repetitions and select muscle damage biomarker responses. Sixteen healthy men volunteered to participate in this study and were randomly assigned to Cooling (n = 8) or Control (n = 8) groups. They performed ...
Lehance C - - 2011
During long-distance exercise, it can become difficult to continue to provide good nutrition support. The aim was to evaluate the potential of sausage "Saucisport" (water: 71%, proteins: 17%, carbohydrates: 3%, fat: 6%, other: 3%) to maintain metabolic balance and performance during long-distance exercise. 10 male long-distance runners (mean ± SD: ...
Ranchordas M K - - 2011
Increasing literature has studied the effects of dietary nitrates and moreover, L-arginine supplementation on tolerance to exercise and O(2) consumption during exercise. However, few studies have investigated the effects of L-arginine on performance measures such as a time trial. It was hypothesised that an acute 3-day L-arginine supplementation would elicit ...
Di Mascio M - - 2011
The aim of this study was to examine the most intense periods of high-intensity running during elite soccer matches. Elite players (n=100) were analysed using a multi-camera computerised tracking system. Total high-intensity running distance (speed ≥19.8 km·h(-1)) and that covered in the most intense 5-min period were quantified during games. ...
Bagley James R - - 2011
Exposure to cold environments affects human performance and physiological function. Major medical organizations recommend rectal temperature (TREC) to evaluate core body temperature (TcORE) during exercise in the cold; however, other field expedient devices claim to measure TCORE. The purpose of this study was to determine if field expedient devices provide ...
Minshull Claire - - 2011
Abstract The effects of serial episodes of fatigue and recovery on volitional and magnetically evoked neuromuscular performance of the knee flexors were assessed in 20 female soccer players during: (i) an intervention comprising 4 × 35 s maximal static exercise, and (ii) a control condition. Volitional peak force was impaired progressively (∼16% vs. ...
Heinonen Ilkka - - 2012
Glucose metabolism increases in hypoxia and can be influenced by endogenous adenosine, but the role of adenosine for regulating glucose metabolism at rest or during exercise in hypoxia has not been elucidated in humans. We studied the effects of exogenous adenosine on human skeletal muscle glucose uptake and other blood ...
Krans Elizabeth E - - 2011
The objective of the authors in this study was to identify pregnant, low-income African American women's barriers and facilitators to exercise during pregnancy. A series of six focus groups with pregnant African American women were audio-recorded and transcribed verbatim. Focus group transcripts were qualitatively analyzed for major themes and independently ...
de Sousa N M F - - 2011
The aims were both to determine lactate and ventilatory threshold during incremental resistance training and to analyze the acute cardiorespiratory and metabolic responses during constant-load resistance exercise at lactate threshold (LT) intensity. Ten healthy men performed 2 protocols on leg press machine. The incremental test was performed to determine the ...
Rojas Vega S - - 2011
The influence of acidosis on brain-derived neurotrophic factor (BDNF) was examined by buffering pH changes during 10 min of continuous low intensity (LIE) and following high intensity cycling exercise to exhaustion (HIE). 11 athletes participated in 2 trials separated by 1 week. Individuals received either a placebo infusion (isotonic saline) or ...
Secher Niels H NH The Copenhagen Muscle Research Centre, Department of Anaesthesia, Rigshospitalet, University of Copenhagen, Denmark. - - 2012
During exercise, neural input from skeletal muscles reflexly maintains or elevates blood pressure (BP) despite a maybe fivefold increase in vascular conductance. This exercise pressor reflex is illustrated by similar heart rate (HR) and BP responses to electrically induced and voluntary exercise. The importance of the exercise pressor reflex for ...
Hilty Lea - - 2011
In the present study, intracortical communication between mid/anterior insular and motor cortex was investigated during a fatiguing cycling exercise. From 16 healthy male subjects performing a constant-load test at 60% peak oxygen consumption (VO(2peak) ) until volitional exhaustion, electroencephalography data were analysed during repetitive, artefact-free periods of 1-min duration. To ...
Armstrong Lawrence E - - 2011
Despite the rapid growth of mass-participation road cycling, little is known about the dietary, metabolic and behavioral responses of ultra-endurance cyclists. This investigation describes physiological responses, perceptual ratings, energy balance, and macronutrient intake of 42 men (mean ± SD; age, 38±6 y; height, 179.7±7.1 cm; body mass, 85.85±14.79 kg) and ...
Binder Konrad - - 2012
The relative influence of muscle metabo- and baroreflex activity on heat loss responses during post-isometric handgrip (IHG) exercise ischemia remains unknown, particularly under heat stress. Therefore, we examined the separate and integrated influences of metabo- and baroreceptor-mediated reflex activity on sweat rate and cutaneous vascular conductance (CVC) under increasing levels ...
Nagelkirk Paul R - - 2011
INTRODUCTION: During exercise, ischemic risk increases, possibly due to changes in coagulation and fibrinolytic activity. Previous research suggests ambient temperature affects resting thrombotic potential, but the effect of heat and cold on hemostasis during exercise is unknown. The purpose of this study was to assess changes in coagulation and fibrinolysis ...
Piira Olli-Pekka - - 2011
Abstract Objectives: Emotional excitement may trigger serious cardiovascular (CV) events. Our objective was to compare the changes in potential surrogate markers of CV events in patients with coronary artery disease (CAD) during emotional excitement and exercise. Design: 53 enthusiastic ice hockey spectators with stable CAD attended the Finnish national ice ...
van Beek Johannes H G M - - 2011
The human physiological system is stressed to its limits during endurance sports competition events. We describe a whole body computational model for energy conversion during bicycle racing. About 23 per cent of the metabolic energy is used for muscle work, the rest is converted to heat. We calculated heat transfer ...
Sun Feng-Hua - - 2011
The purpose of the present study was to investigate whether both glycemic index (GI) and fructose content of a pre-exercise meal would affect substrate utilization during subsequent brisk walking. Ten healthy young males completed 60 min of 46% [Formula: see text] brisk walking 2 h after they consumed one of three breakfasts: ...
Ramiro Felicio Lílian - - 2011
The purpose of this study was to correlate the trochlear shape and patellar tilt angle and lateral patellar displacement at rest and maximal voluntary isometric contraction (MVIC) exercises during Open (OKC) and Closed Kinetic Chain (CKC) in subjects with and without anterior knee pain (AKP). Subjects were all women, 20 ...
Ogura Emiko - - 2011
Oral exercises, including tongue, lip, and jaw movements, are commonly used in clinical practice as training to improve oral and pharyngeal swallowing in dysphagia patients. These rehabilitation exercises are believed to affect the peripheral and central nervous system at various levels. However, few studies have examined healthy subjects' brain activity ...
Lalande Sophie - - 2012
This study investigated the effect of changes in inspiratory intrathoracic pressure on stroke volume at rest and during moderate exercise in patients with heart failure and reduced ejection fraction (HFREF) as well as healthy individuals. Stroke volume was obtained by echocardiography during 2 min of spontaneous breathing (S), two progressive ...
Edvardsen Elisabeth - - 2011
Edvardsen, E, Ingjer, F, and Bø, K. Fit women are not able to use the whole aerobic capacity during aerobic dance. J Strength Cond Res 25(X): 000-000, 2011-This study compared the aerobic capacity during maximal aerobic dance and treadmill running in fit women. Thirteen well-trained female aerobic dance instructors aged ...
Kannas Theodoros M - - 2011
Kannas, TM, Kellis, E, and Amiridis, IG. Biomechanical differences between incline and plane hopping. J Strength Cond Res 25(X): 000-000, 2011-The need for the generation of higher joint power output during performance of dynamic activities led us to investigate the force-length relationship of the plantar flexors during consecutive stretch-shortening cycles ...
Avelar Núbia Cp - - 2011
Avelar, NCP, Simão, AP, Tossige-Gomes, R, Neves, CDC, Mezencio, B, Szmuchrowski, L, Coimbra, CC, and Lacerda, ACR. Oxygen consumption and heart rate during repeated squatting exercises with or without whole-body vibration in the elderly. J Strength Cond Res 25(X): 000-000, 2011-The aim of this study was to investigate whether vibration ...
Matsui Takashi - - 2012
Brain glycogen localized in astrocytes, a critical energy source for neurons, decreases during prolonged exhaustive exercise with hypoglycaemia. However, it is uncertain whether exhaustive exercise induces glycogen supercompensation in the brain as in skeletal muscle. To explore this question, we exercised adult male rats to exhaustion at moderate intensity (20 ...
Eliakim Michal - - 2011
Eliakim, M, Bodner, E, Eliakim, A, Nemet, D, and Meckel, Y. Effect of motivational music on lactate levels during recovery from intense exercise. J Strength Cond Res 25(X): 000-000, 2011-The effects of music played during an exercise task on athletic performance have been previously studied. Yet, these results are not ...
Wahl Patrick - - 2011
The goal of the study was to evaluate and to quantify the effects of local electromyostimulation (EMS) during cycling on the cardio-respiratory system, muscle metabolism and perceived exertion compared to cycling with no EMS.Ten healthy men (age: 24.6 ± 3.2 years, VO2max: 54.1 ± 6.0 ml/min/kg) performed three incremental cycle ...
Bruce Richard M - - 2011
Respiratory and cardiovascular responses to muscle mechanoreflex, (passive calf stretch) and metaboreflex (local circulatory occlusion) activation, were examined during inhalation of an hypercapnic gas mixture in 4 trials. These controlled for the effects of metabolite sensitisation of muscle afferents, hypercapnia induced elevation of central respiratory drive and also central command.In ...
M Russell - - 2011
This study evaluated changes in markers of acid-base balance that occurred during simulated soccer match-play. Sixteen academy soccer players participated in a soccer match simulation (SMS) that consisted of 90 min of soccer-specific exercise with skills throughout. Blood samples were obtained before exercise (pre-exercise), and every 15-min during the simulation ...
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