Search Results
Results 551 - 600 of 926
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Smye S W - - 1998
A two-compartment model of urea kinetics during hemodialysis is used to predict the effect of exercise on hemodialysis dose. It is assumed that the two compartments represent tissues that are perfused by low and high blood flows (initially 1.1 L/min and 3.8 L/min). The effect of changing the distribution of ...
Aminoff T - - 1998
Nine healthy men (aged 54-59 years) performed arm crank and leg cycle exercises for 30 min at relative work loads of 50 and 75% of peak oxygen uptake (VO2) for the corresponding muscle group, and for 60 min at a relative work load of 30% of peak VO2 for the ...
Shinohara M - - 1998
To investigate the efficacy of ischemia in strength training with low mechanical stress, tourniquet ischemia was utilized in low-resistance training. Five untrained subjects conducted one-legged isometric knee extension training with one leg ischemic (I-leg) and the other non-ischemic (NI-leg). Repeated isometric contractions for 2 s with 3 s relaxation in ...
Lang C C - - 1997
Endothelial release of prostaglandins may contribute to exercise-induced skeletal muscle arteriolar vasodilation in patients with heart failure. To test this hypothesis, we examined the effect of indomethacin on leg circulation and metabolism in eight chronic heart failure patients, aged 55 +/- 4 yr. Central hemodynamics and leg blood flow, determined ...
Alison J A - - 1997
Physiological responses to upper limb exercise have not been well documented in patients with cystic fibrosis (CF). This is the first study to quantify ventilatory responses to supported incremental upper limb exercise in this patient group. Twenty-four subjects with CF, with a wide range of pulmonary impairment, and ten normal ...
Kingwell B A - - 1997
Exercise training elevates arterial compliance at rest, but the effects of acute exercise in this regard are unknown. This study investigated the effects of a single, 30-min bout of cycling exercise at 65% of maximal oxygen consumption on indexes of arterial compliance. Whole body arterial compliance determined noninvasively from simultaneous ...
Brambrink J K - - 1997
The 18 h post-exercise glucose and insulin responses of six male and six female subjects were measured following one- or two-leg cycling to determine the influence of muscle mass involvement and work. Each subject performed three exercise trials on a Cybex Met 100 cycle ergometer: (1) two-leg exercise for 30 ...
Raymond J - - 1997
The purpose of this study was to compare the oxygen uptake and heart rate responses during submaximal arm cranking to combined arm cranking + electrical stimulation (ES)-induced leg cycling in individuals with spinal cord injury (SCI). Seven subjects with paraplegia (T4-T12) performed combined arm and leg cycling exercise for 5 ...
Arnaud S - - 1997
In untrained subjects exercising on a cycle at constant work loads presented at a sub- or suprathreshold level, reduced M wave amplitude with lengthening of duration was measured in vastus lateralis muscle during and after suprathreshold exercise. M wave changes were correlated with increased blood lactate concentration. At the two ...
Wada O - - 1997
BACKGROUND AND HYPOTHESIS: Decreased blood flow to working muscles makes an important contribution to exercise intolerance in patients with chronic heart failure. This study was undertaken to examine whether maldistribution of skeletal muscle blood flow is closely related to exercise intolerance in patients with cardiac dysfunction. METHODS: Whole-body thallium scintigraphy ...
Styf J - - 1997
We diagnosed entrapment of the superficial peroneal nerve in 17 patients (19 legs) with a mean age of 41 years. In all cases, plain radiographs of the leg, nerve-conduction studies of the superficial peroneal nerve and measurement of the intramuscular pressure at rest after exercise were normal. Diagnostic tests for ...
Williamson J W - - 1997
1. The insular cortex has been implicated as a region of cortical cardiovascular control, yet its role during exercise remains undefined. The purpose of the present investigation was to determine whether the insular cortex was activated during volitional dynamic exercise and to evaluate further its role as a site for ...
Shields R K - - 1997
STUDY DESIGN: This prospective study evaluated the abdominal muscle activity during the Isometric bent knee curl and double straight leg lowering exercise. OBJECTIVES: To compare the magnitude of the electromyographic activity across the curl and double straight leg lowering exercise and determine if the muscle synergies were specific to a ...
Haskell A - - 1997
To test the hypotheses that plasma volume (PV) expansion 24 h after intense exercise is associated with reduced transcapillary escape rate of albumin (TERalb) and that local changes in transcapillary forces in the previously active tissues favor retention of protein in the vascular space, we measured PV, TERalb, plasma colloid ...
Swaine I L - - 1997
There are few studies on the relative cardiopulmonary demands of the arm-stroke and the leg-kicking action in swimmers, mainly because of the absence of a suitable dry-land ergometer. Therefore, the purpose of this study was to compare the cardiopulmonary responses to exercise using a swim bench and a leg-kicking ergometer. ...
Shoemaker J K - - 1997
OBJECTIVE: Whether the dimensions of conduit arteries contribute to the time course of change in blood flow during voluntary rhythmic exercise, and the mechanisms governing such a response in humans, are not known. METHODS: The time course of change in the vascular and blood flow dynamics in the brachial artery ...
Karlsson A K - - 1997
Most neurophysiological studies have shown similar sympathetic outflow to arm and leg. However, some direct microneurographic recordings indicate differentiated sympathetic outflow to limbs both at rest and during mental stress. Hence, differentiated levels of norepinephrine (NE) spillover could prevail. By steady-state infusion of [3H]NE and body composition determination by dual-energy ...
Lang C C - - 1997
BACKGROUND: In patients with heart failure, excessive sympathetic activation during exercise could interfere with exercise performance by impairing arteriolar dilation in working muscle and by adversely altering skeletal muscle metabolic behavior. To test this hypothesis, we examined the effect of sympathoinhibition with clonidine, a central sympatholytic agent, on skeletal muscle ...
Jankowski L W - - 1997
To determine the effects of moderate, intermittent exercise during decompression on the Doppler detectable amount of venous gas emboli (VGE), 29 healthy male volunteers performed 44 wet (8 degrees +/- 2 degrees C) dives to 45 msw (450 kPa) for 30 min with standard air decompression. During compression and the ...
Mohler L R - - 1997
Currently, the definitive diagnosis of chronic compartment syndrome is based on invasive measurements of intracompartmental pressure. We measured the intramuscular pressure and the relative oxygenation in the anterior compartment of the leg in eighteen patients who were suspected of having chronic compartment syndrome as well as in ten control subjects ...
Louisy F - - 1997
Leg venous hemodynamics [venous distensibility index (VDI), arterial flow index (AFI), half-emptying time (T1/2)], and leg volumes (LV) were assessed by mercury strain-gauge plethysmography with venous occlusion and volometry, respectively, in seven men before, during, and after 42 days of 6 degrees head-down bed rest. Results showed a high increase ...
Ploutz-Snyder L L - - 1997
The hypothesis that increased muscle T2 after exercise is caused by increased extracellular fluid volume was tested by comparing the effects of exercise versus external leg negative pressure on muscle T2 relaxation in normal human subjects. T2 in lower leg muscles was measured by echo-planar imaging at 63 echo times ...
Harms C A - - 1997
We hypothesized that during exercise at maximal O2 consumption (VO2max), high demand for respiratory muscle blood flow (Q) would elicit locomotor muscle vasoconstriction and compromise limb Q. Seven male cyclists (VO2max 64 +/- 6 ml.kg-1.min-1) each completed 14 exercise bouts of 2.5-min duration at VO2max on a cycle ergometer during ...
Maeda S - - 1997
Endothelin-1 (ET-1) is an endothelium-derived potent vasoconstrictor peptide that potentiates contractions to norepinephrine in human vessels. We previously reported that the circulating plasma concentration of ET-1 is significantly increased after exercise (S. Maeda, T. Miyauchi, K. Goto, and M. Matsuda. J. Appl. Physiol. 77: 1399-1402, 1994). To study the roles ...
Jondeau G - - 1997
Angiotensin-converting enzyme inhibitors have been shown to increase maximal muscle blood flow in parallel to peak VO2 in patients with congestive heart failure (CHF). Whether this increase shifts factors limiting peak aerobic capacity from periphery (skeletal muscle or vessels) to central factors (cardiac or respiratory) is unknown. Comparison of peak ...
Magnusson G - - 1997
OBJECTIVES: The issue to be resolved was whether peripheral leg blood flow in patients with chronic heart failure (CHF) is reduced by low local flow capacity or as a function of the amount of muscle mass activated during exercise. METHODS AND RESULTS: In ten CHF patients (ejection fraction 26 (9)%), ...
Davies G J - - 1997
Due to increasing emphasis on closed kinetic chain exercises in rehabilitation, there is a need to objectively quantify their effectiveness. The purpose of this study was to determine the test-retest reliability of the peak force and total work scores during a concentric isokinetic leg press pattern using the Lido Linea ...
Gregorio P - - 1997
To study the design, control and energetics of autonomous dynamically stable legged machines we have built a planar one-legged robot, the ARL Monopod. Its top running speed of 4.3 km/h (1.2 m/s) makes it the fastest electrically actuated legged robot to date. We adapted Raibert's control laws for the low ...
De Lorenzo A - - 1997
Total and segmental body compositions (left arm and left leg) were measured by bioelectrical impedance analysis at 5 and 100 kHz and by dual-energy X-ray absorptiometry (DXA) in 14 healthy young males (body mass index, mean +/- SD, 23.5 +/- 2.7 kg/m2) every 20 min for a period of 100 ...
Suzuki Y - - 1997
Delta efficiency(DE) at mild-moderate (31%-56% of maximum oxygen uptake) bicycle exercise in the upright sitting and in the supine position was measured in 10 young males and 5 females before and after 20 days bed rest (BR). Total muscle mass in the both legs(TMML) were measured by dual-energy x-ray absorptiometry. ...
Eijsbouts X H - - 1997
The purpose of this study was to investigate the hypothesis that changes in physiological responses during arm-cranking exercise using electrical stimulation of the leg muscles (ACE-ES) compared to arm-cranking exercise alone (ACE) in able-bodied subjects (ABS) are based on an increase in active muscle mass rather than the enhancing effect ...
McCarthy J P - - 1997
Resistance exercise has been suggested to increase blood volume, increase the sensitivity of the carotid baroreceptor cardiac reflex response (BARO), and decrease leg compliance, all factors that are expected to improve orthostatic tolerance. To further test these hypotheses, cardiovascular responses to standing and to pre-syncopal limited lower body negative pressure ...
Louisy F - - 1997
Leg volume changes were assessed in healthy volunteers by mercury strain gauge postural plethysmography in order to study the effects of different types of physical training on lower limb venous distensibility and emptying. Seven endurance trained subjects (E), seven muscle strength trained subjects (M) and seven sedentary subjects (S) were ...
Henning R A - - 1997
Computer operators at two work sites (n = 73, n = 19) were prompted to take three 30-s and one 3-min break from computer work each hour in addition to conventional rest breaks. Some operators were asked to perform stretching exercises during the short breaks. Mood state and musculoskeletal discomfort ...
Uda S - - 1997
This study investigated the effectiveness of several possible exercises for performance during standing work in order to prevent lower leg swelling and relieve subjective complaints. Volume changes in the lower leg were measured using bioelectrical impedance plethysmography in 13 healthy male subjects aged 23-36 years. Subjective complaints of leg pain, ...
Hollman J E - - 1997
BACKGROUND AND PURPOSE: A proposed mechanism for the pain-relieving properties of transcutaneous electrical nerve stimulation (TENS) is gating of impulses carried by group III and IV afferent nerve fibers. The purpose of this study was to determine the effects of TENS on the pressor response to static exercise, a response ...
Aminoff T - - 1997
Ten young (aged 23-30 years) and nine older (aged 54-59 years) healthy men with a similar size of limb muscle mass performed arm crank and leg cycle exercise for 30 min at relative exercise intensities of 50% and 75% of maximal oxygen uptake for the corresponding muscle group. In the ...
Ramonatxo M - - 1996
The aim of the study was to compare breathing pattern, mouth occlusion pressure, mean inspiratory flow and the ratio of mouth occlusion pressure to mean inspiratory flow at the same power output and carbon dioxide output during arm and leg incremental exercise. Mouth occlusion pressure was used as an index ...
Isnard R - - 1996
Blood flow to working skeletal muscle is usually reduced during exercise in patients with congestive heart failure. An intrinsic impairment of skeletal muscle vasodilatory capacity has been suspected as a mechanism of this muscle underperfusion during maximal exercise, but its role during submaximal exercise remains unclear. Therefore, we studied by ...
Keteyian S J - - 1996
PURPOSE: This study compares the responses of 20 male patients (mean age 51 +/- 11 years) with stable heart failure during peak and submaximal arm and leg exercise. METHODS: On day 1, subjects completed two symptom-limited graded exercise tests, one with their arms and one with their legs. On day ...
Hamilton A L - - 1996
The aim of the study was to compare (1) the intensity of leg effort and dyspnea during exercise and (2) subjective limitations to performance in normal subjects, patients receiving medication for cardiac disorders, patients with pulmonary impairment, patients with pulmonary impairment who were also receiving cardiac medications, patients experiencing chest ...
Günthard J - - 1996
Ten years after coarctation repair, 36 adolescents and young adults were studied in order to evaluate the relationship of anatomy at the resection site to blood pressure and arm-leg and Doppler gradients. The patients underwent magnetic resonance imaging (MRI), exercise testing, and continuous wave (CW) Doppler echocardiography. On MRI, residual ...
Guenthard J - - 1996
Seventeen years after coarctation repair, 36 patients were studied by magnetic resonance imaging and exercise testing to measure residual anatomical stenosis and hormonal response to exercise, and to evaluate their effect on arm-leg gradients and on exercise hypertension. The systolic arm pressure, leg pressure and arm-leg gradient were measured at ...
Pizza F X - - 1996
The primary purpose of the study was to compare maximal accumulated oxygen deficit (MAOD) in resistance-trained (RT), endurance-trained (ET), and untrained men (UT). A secondary purpose was to determine the influence of leg muscle mass (MM) on MAOD by examining the relationship between MM and MAOD and by comparing MAOD ...
Kosmas E N - - 1996
Since leg muscles receive the majority of cardiac output and consume a large proportion of total oxygen consumption (VO2) during cycle exercise, maximum leg blood flow may be an important determinant of peak VO2 (VO2peak). We investigated the relationships between parameters of active hyperemia after thigh tourniquet occlusion (alone or ...
O'Connor P J - - 1996
This study examined psychometric correlates of rated perceived exertion (RPE) and perceived dyspnea (RPD) during progressive arm ergometry. Thirty female and 30 male subjects completed the State-Trait Anxiety Inventory (STAI), the Profile of Mood States Questionnaire (POMS) and the Body Awareness Scale (BAS) followed by progressive arm ergometry to exhaustion. ...
Vernazza S - - 1996
The aim of the present study was to determine (i) whether the centre of gravity (CG) shift resulting from the mechanical effect of arm raising in the frontal plane is minimized in standing subjects and (ii) whether this putative minimization is affected by the support conditions (unipedal vs bipedal) and/or ...
Stevenson T J - - 1996
OBJECTIVE: To examine the concurrent validity of the Berg Balance Scale (BBS) in subjects with hemiparesis after stroke by correlating functional balance performance on the BBS with laboratory measures of balance (center of pressure [CP] and electromyographic [EMG] activity of leg musculature during rapid arm flexion and during quiet stance). ...
Hallén J - - 1996
Infusion of the beta 2-adrenoceptor agonist terbutaline will cause an activation of the Na(+)-K+ pump that leads to lowering of plasma K+ concentration and intracellular Na+ concentration. The present study examines whether these changes will affect the K+ homeostasis during subsequent exercise. Two-legged knee-extension exercise was carried out at low ...
Kagaya A - - 1996
The present study aimed to determine whether vasoconstriction in active calf occurring during combined exercise diminished or persisted when added low- and high-intensity elbow flexion exercise ceased and single leg exercise continued. Six active women (mean age, 21.2 years) participated in this study. During 10-min plantar flexion exercise at 10% ...
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