Search Results
Results 351 - 400 of 927
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Markham Larry W - - 2004
Often, the lack of systemic arterial hypertension and the lack of a resting arm-leg blood pressure gradient are used to assess the adequacy of the anatomic result after intervention for coarctation of the aorta (CoA). Some patients with no arm-leg gradient at rest may develop a gradient with exercise, leading ...
Polichnowski Aaron J - - 2005
Uncertainty exists as to whether a period of passive arterial occlusion (PAO) or ischemic exercise (IE) results in peak lower leg vascular conductance (LVC). This uncertainty is due to the different body positions, active muscle mass, and occlusion times used for PAO or IE. The purpose of this study was ...
Keller David Melvin - - 2004
Carotid baroreflex (CBR) function was examined in five men and three women (25 +/- 1 years) using the variable-pressure neck collar technique at rest and during dynamic, one-legged knee extension exercise at 7 W and 25 W. The CBR exhibited control of leg vascular conductance (LVC) at rest and during ...
Keller David Melvin - - 2004
In the present investigation we examined the role of ATP-sensitive potassium (K(ATP)) channel activity in modulating carotid baroreflex (CBR)-induced vasoconstriction in the vasculature of the leg. The CBR control of mean arterial pressure (MAP) and leg vascular conductance (LVC) was determined in seven subjects (25 +/- 1 years, mean +/- ...
Zehr E Paul - - 2004
Walking can be a very automated process, and it is likely that central pattern generators (CPGs) play a role in the coordination of the limbs. Recent evidence suggests that both the arms and legs are regulated by CPGs and that sensory feedback also regulates the CPG activity and assists in ...
Zhang Q - - 2004
We used photoplethysmography (PPG) to measure the relative changes in the anterior tibial muscle blood flow (MBF) in response to exercise when intramuscular pressure (IMP) was elevated (the test leg) or when IMP was normal (the control leg). The elevated IMP was induced by applying venous obstruction of 40 mmHg ...
Willardson Jeffrey M - - 2004
The purpose of this research was to devise prediction equations whereby a 10 repetition maximum (10RM) for the free weight parallel squat could be predicted using the following predictor variables: 10RM for the 45 degrees angled leg press, body mass, and limb length. Sixty men were tested over a 3-week ...
Sugawara Jun - - 2004
We previously reported that even low-intensity, short-duration acute aerobic exercise decreases arterial stiffness. We aimed to test the hypothesis that the exercise-induced decrease in arterial stiffness is caused by the increased production of NO in vascular endothelium with exercise. Nine healthy men (age: approximately 22-28 yr) performed a 5-min single-leg ...
Instebø Arne - - 2004
Coarctation of the aorta represents 5-7% of congenital heart defects. Symptoms and prognosis depend on the degree of stenosis, age at surgery, surgical method and the presence of other heart defects. Postoperative complications are hypertension, restenosis and an abnormal blood pressure response during exercise. This study includes 41 patients, 15-40 ...
Wray D Walter - - 2004
We sought to determine the dynamic relationship between carotid baroreflex (CBR)-mediated control and local control of the skeletal muscle vasculature during dynamic exercise. In 12 subjects (18-35 years old), oscillatory neck pressure (NP, +40 mmHg) was applied at 0.1 Hz (i.e. 5 s on, 5 s off) for 5 min ...
Krustrup Peter - - 2004
The present study tested the hypothesis that intense interval training enhances human skeletal muscle blood flow and oxygen uptake (VO2) at the onset of dynamic exercise. We also investigated whether possible training effects were dependent on exercise intensity. Six habitually active males carried out 7 weeks of intermittent-exercise one-legged knee-extensor ...
Crameri Regina M - - 2004
Increases in procollagen processing within skeletal muscle have previously been reported in small animal models only. While indirect measurements in humans have suggested an increase procollagen processing, no intra-skeletal muscle measurements have confirmed these findings. In this study, eight young healthy male subjects performed a single bout of unaccustomed high ...
Guedes J R P - - 2004
One strand of research on the scientific basis of homeopathy is based on inversion effects of dilutions and the biophysical properties of information transfer. A model developed by Endler, was the basis for the study of the influence of high-diluted solution (1:1026 part by weight) of thyroid glands on the ...
Dalsgaard Mads K - - 2004
When continuation of exercise calls for a "will," the cerebral metabolic ratio of O2 to (glucose + lactate) decreases, with the largest reduction (30-50%) at exhaustion. Because a larger effort is required to exercise with the arms than with the legs, we tested the hypothesis that the reduction in the ...
Qi Bao Quan - - 2004
Lumbosacral vertebral abnormalities are a common association of anorectal malformations (ARMs) and are one of the determinants of the eventual level of fecal continence that can be achieved. This study used a fetal rat model to investigate the spectrum of axial skeletal maldevelopment that may occur with ARMs. Time-mated pregnant ...
Durham William J - - 2004
The present study investigated the responses of leg glucose and protein metabolism during an acute bout of resistance exercise. Seven subjects (5 men, 2 women) were studied at rest and during a strenuous lower body resistance exercise regimen consisting of approximately 8 sets of 10 repetitions of leg press at ...
Walsh L D - - 2004
After a period of eccentric exercise of elbow flexor muscles of one arm in young, adult human subjects, muscles became fatigued and damaged. Damage indicators were a fall in force, change in resting elbow angle and delayed onset of soreness. After the exercise, subjects were asked to match the forearm ...
Huang Helen J - - 2004
During gait rehabilitation, therapists or robotic devices often supply physical assistance to a patient's lower limbs to aid stepping. The expensive equipment and intensive manual labor required for these therapies limit their availability to patients. One alternative solution is to design devices where patients could use their upper limbs to ...
Calbet J A L - - 2004
That muscular blood flow may reach 2.5 l kg(-1) min(-1) in the quadriceps muscle has led to the suggestion that muscular vascular conductance must be restrained during whole body exercise to avoid hypotension. The main aim of this study was to determine the maximal arm and leg muscle vascular conductances ...
Cetinus E - - 2004
Recurrent pain in the lower leg caused by exercise is a common problem in athletes. The main causes are exercise induced compartment syndrome, periostitis of the tibia, stress fracture, venous diseases, obliterative arterial diseases, and shin splints. Exercise induced compartment syndrome is the least common. A recurrent tightening or tense ...
Chesler Roseann M - - 2004
BACKGROUND: Two-dimensional exercise echocardiography is commonly performed in the supine (SUP) left lateral posture (SLL) to optimize imaging quality. OBJECTIVES: To assess the clinical use of SLL cycle ergometry, we determined the metabolic, cardiovascular, and hemodynamic responses during graded leg cycle ergometry in women, performed in SLL, commonly used during ...
Sato Kohei - - 2004
The purpose of this study was to clarify the characteristics of ventilatory and circulatory responses at the onset of voluntary exercise and passive movement in sprinters. Eleven male university sprinters and 11 male untrained subjects participated in the present study. Voluntary exercise consisted of leg extension-flexion movement for 20 s ...
Ray Chester A - - 2004
Measurement of skin sympathetic nerve activity (SSNA) during isometric exercise has been previously limited to handgrip. We hypothesized that isometric leg exercise due to the greater muscle mass of the leg would elicit greater SSNA responses than arm exercise because of presumably greater central command and muscle mechanoreceptor activation. To ...
Yanagisawa Osamu - - 2004
This study assessed the effects of cooling on blood flow and intramuscular water content in human skeletal muscles after exercise using magnetic resonance imaging. In six male subjects, their legs were randomly assigned to be control or to be cooled. All subjects performed ankle dorsiflexion exercise inside an imaging magnet ...
Drysdale Cheri L. - - 2004
OBJECTIVE: To investigate surface electromyographic (EMG) activity of the rectus abdominus and external oblique abdominus muscles during pelvic-tilt and abdominal-hollowing exercises performed in different positions. DESIGN AND SETTING: 2 x 3 (exercise by position) within-subjects design with repeated measures on both factors. All testing was performed in a university laboratory. ...
Davoodi Rahman - - 2004
An indoor personal rowing machine (Concept 2 Inc., Morrisville, VT) has been modified for functional electrical stimulation assisted rowing exercise in paraplegia. To successfully perform the rowing maneuver, the voluntarily controlled upper body movements must be coordinated with the movements of the electrically stimulated paralyzed legs. To achieve such coordination, ...
Watenpaugh Donald E - - 2004
We hypothesized that gravitational stimuli elicit cardiovascular responses in the following order with gravitational stress equalized at the level of the feet, from lowest to highest response: short-(SAC) and long-arm centrifugation (LAC), tilt, and lower body negative pressure (LBNP). Up to 15 healthy subjects underwent graded application of the four ...
Green James M - - 2004
Elliptical exercise has recently increased in popularity. However, little is known regarding heart rate and perceptual responses during this exercise mode even though such information is important with respect to prescribing and regulating exercise intensity. In the current study, heart rate and perceived exertion were compared between treadmill and elliptical ...
Fenech Marianne - - 2004
Extracellular (ECW) and intracellular (ICW) volumes were measured using both segmental and wrist-ankle (W-A) bioimpedance spectroscopy (5-1000 kHz) in 15 healthy subjects (7 men, 8 women). In the 1st protocol, the subject, after sitting for 30 min, laid supine for at least 30 min. In the second protocol, the subject, ...
Melin Amanda D - - 2004
We present a two-part undergraduate laboratory exercise. In the first part, electron transport in bovine heart submitochondrial particles causing reduction of cytochrome c is monitored at 550 nm. Redox-active dyes have historically been used in most previous undergraduate laboratory exercises of this sort but do not demonstrate respiratory inhibition by ...
Bartok Cynthia - - 2004
Given that some wrestlers arrive for minimum weight (MW) testing in a dehydrated condition, it is important to understand the effects of dehydration on MW assessment methods. PURPOSE: To determine the effect of dehydration on the assessment of MW by three-site skinfolds with the Lohman formula (SF), leg-to-leg bioelectrical impedance ...
Takagi Hideki - - 2004
The purpose of this study was to analyse stroke phases, arm-leg coordination and trunk motion fluctuation during breaststroke in elite male and female 50, 100 and 200 m events at the 9th FINA World Swimming Championships, Fukuoka 2001. Four phases of the arm stroke and three phases of the leg ...
Kamiya Atsunori - - 2004
Although spaceflight and bed rest are known to cause muscular atrophy in the antigravity muscles of the legs, the changes in sympathetic and cardiovascular responses to exercises using the atrophied muscles remain unknown. We hypothesized that bed rest would augment sympathetic responses to isometric exercise using antigravity leg muscles in ...
Tachi Masanobu - - 2004
This study aimed to examine the influences of circulatory difference on the utilization of O(2) and the progression of fatigue in the tibialis anterior (TA) muscle during dorsiflexion exercise, with reference to different body postures. The subjects performed intermittent static dorsiflexion at 50% of maximal voluntary contraction (MVC) up to ...
Volianitis S - - 2004
We investigated arm perfusion and metabolism during upper body exercise. Eight average, fit subjects and seven rowers, mean +/- SE maximal oxygen uptake (VO2 max) 157 +/- 7 and 223 +/- 14 ml O2. kg(-0.73).min(-1), respectively, performed incremental arm cranking to exhaustion. Arm blood flow (ABF) was measured with thermodilution ...
Vilpoux Kathia - - 2003
Aspects of pantopod ontogeny have been known for a long time, but specific information is available for only a few species. Our account of the postembryonic development of Pycnogonum litorale is based on laboratory-reared individuals and SEM studies. We documented particularly all early developmental stages, with emphasis on morphogenetic changes ...
Houdijk Han - - 2003
PURPOSE: The introduction of the klapskate in speed skating confronts skaters with the question of how to adjust the position of the hinge in order to maximize performance. The purpose of this study was to reveal the constraint that klapskate hinge position imposes on push-off performance in speed skating. METHOD: ...
Schalow G - - 2003
Coordination dynamics were measured in Parkinson's disease patients to quantify central nervous system (CNS) dysfunction. The low-load coordination dynamics in the patients were impaired by 56% for forward and 44% for backward moving in comparison to a control group of similar age. Exercising at higher load was only partly possible. ...
Nielsen Jens Jung - - 2004
A rise in extracellular potassium concentration in human skeletal muscle may play an important role in development of fatigue during intense exercise. The aim of the present study was to examine the effect of intense intermittent training on muscle interstitial potassium kinetics and its relationship to the density of Na(+),K(+)-ATPase ...
Trappe Todd - - 2004
We combined the interstitial sampling method of microdialysis with the natural tracer qualities (i.e. non-recyclability) of the amino acid 3-methylhistidine (3MH) to uniquely study in vivo degradation of the two most abundant skeletal muscle proteins, myosin and actin. Interstitial 3MH concentration was measured before and for 24 h following a ...
Motl Robert W - - 2003
The amplitude of the Hoffman reflex (H-reflex) in the soleus muscle is attenuated after acute bouts of leg-cycling exercise. The attenuation has been interpreted as a "tranquilizing" effect of exercise controlled by the central nervous system and generalized beyond a single spinal segmental level. If so, the postexercise depression of ...
Saboisky Julian - - 2003
In this study we measured the central activation ratio (CAR) of the leg extensors and the elbow flexor muscles before and after exhaustive exercise in the heat to determine whether exercise-induced hyperthermia affects the CNS drive to exercised (leg extensors) and/or non-exercised (forearm flexors) muscle groups. Thirteen subjects exercised at ...
Chromiak Joseph A - - 2003
Our purpose was to examine the effect of the chest press and leg press exercises on intraocular pressure (IOP) in physically active, college-aged students. Fifteen healthy males and 15 females performed 3 sets of 10 repetitions of the chest press or leg press with 70% 1 repetition maximum (1RM). IOP ...
Muraki Satoshi - - 2004
The present study investigated the difference in oxygen kinetics in the exercising muscle between arm cranking and leg cycling in women. Twenty-seven females completed incremental arm cranking and leg cycling tests on separate days. During each exercise, spatially resolved near-infrared spectroscopy was used to measure changes in the tissue oxygen ...
Sumners D Paul - - 2003
The aim of the present investigation was to test the hypothesis that long-term modulation (LTM) of the exercise ventilatory response, evidenced as an augmentation in minute ventilation (V(I)) and tidal volume (VT) during the early phase of exercise, is only evident when the muscle groups recruited are the same during ...
Juel Carsten - - 2004
The study investigated the effect of training on lactate and H+ release from human skeletal muscle during one-legged knee-extensor exercise. Six subjects were tested after 7-8 wk of training (fifteen 1-min bouts at approximately 150% of thigh maximal O2 uptake per day). Blood samples, blood flow, and muscle biopsies were ...
Watt Matthew J - - 2004
To examine the effect of attenuated epinephrine and elevated insulin on intramuscular hormone sensitivity lipase activity (HSLa) during exercise, seven men performed 120 min of semirecumbent cycling (60% peak pulmonary oxygen uptake) on two occasions while ingesting either 250 ml of a 6.4% carbohydrate (GLU) or sweet placebo (CON) beverage ...
Motl Robert W - - 2003
This study compared the immediate and prolonged effects of acute bouts of active and passive leg cycling on the soleus H-reflex among 12 young healthy men. The soleus H-reflex was measured immediately before and then 10 and 30 min after 20 min of active, unloaded leg cycling, passively induced leg ...
Scott Adam C - - 2003
A causative role for symptom generation in heart failure has been attributed to overactive muscle afferents, metaboreflex and mechanoreflex. We examined the reproducibility of the methods commonly used to assess these reflexes. Twelve stable heart failure patients (62.8+/-2.4 years) and 18 normals were studied. The metaboreflex was evaluated on both ...
Clark Kathryn M - - 2003
The objective of this pilot study was to determine the effect of 6 different abdominal exercises on the electrical activity of the upper rectus abdominis (URA) and lower rectus abdominis (LRA). Eight healthy, adult volunteers completed 6 random abdominal exercises: curl up, Sissel ball curl up, Ab Trainer curl up, ...
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