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Results 451 - 500 of 908
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Theisen D - - 2001
The purpose of this study was to analyse lower leg skin blood flow (laser Doppler flowmetry) in five individuals with high-level paraplegia (T5-T9), six participants with low-level paraplegia (T10-T12) and six able-bodied controls during 3-minute light and heavy arm-cranking exercises (approximately 15% and 80% peak power output, respectively). Throughout light ...
Mudie M H - - 2001
OBJECTIVE: Recovery of movement in the densely hemiplegic upper extremity remains a problem after stroke. This study aimed to determine whether movement recovery could be improved in the hemiplegic arm with bilateral isokinematic training. METHODS: Within and between groups, planned comparisons investigated the effects of bilateral training on attempts at ...
Giannattasio C - - 2001
BACKGROUND: Exercise training induces cardiovascular changes that are both generalized and restricted to the microcirculation of the tissues more actively involved in the exercise itself. Whether the local effect of exercise extends to larger arteries is unknown, however. METHODS: In the right and left upper limb of 17 right-handed subjects ...
Mani R - - 2001
Intermittent pneumatic compression (IPC) is a mechanical method of delivering compression to swollen limbs. This technique has been used to treat venous leg ulcers and limb swelling due to lymphoedema. The effectiveness of IPC, and the appropriate duration and frequency of IPC therapy are unknown as are the differences between ...
Theisen D - - 2000
difference, P<0.05). The paraplegics developed a higher esophageal and leg skin temperature, which was attributed to the lack of active vasodilation and evaporative cooling over the legs. The results indicate that individuals with paraplegia suffer from impaired cutaneous vasoconstriction at the onset of arm exercise, and possess only a limited ...
Michikami D - - 2000
The purpose of the present study was to evaluate the effect of hypoperfusion to the static-exercised-muscle induced by arm elevation on muscle sympathetic nerve activity (MSNA) recorded from the right tibial nerve (n= 10) by microneurography. Subjects performed static handgrip exercises (SHG) at 30% of maximal voluntary contraction (MVC) for ...
Fu Q - - 2000
To test the hypothesis that increased leg venous compliance (LVC) is one of the contributory factors to orthostatic intolerance (OI) after simulated microgravity, 28 healthy young males were exposed to a 14-day head-down bed rest, and LVC was measured by venous occlusion plethysmography. Orthostatic tolerance was evaluated by a 60 ...
Kamiya A - - 2000
Muscle sympathetic nerve activity (MSNA) is activated during mild-intensity isometric handgrip exercise, but not during isometric leg exercise at a similarly relative intensity. It is unclear whether MSNA is increased by leg exercise at heavy intensity in humans. We aimed to examine how MSNA responds to high-intensity, isometric leg exercise ...
Steensberg A - - 2000
1. Plasma interleukin (IL)-6 concentration is increased with exercise and it has been demonstrated that contracting muscles can produce IL-The question addressed in the present study was whether the IL-6 production by contracting skeletal muscle is of such a magnitude that it can account for the IL-6 accumulating in the ...
Cai Y - - 2000
During 50 degrees head-up tilt (HUT), the number of erythrocytes within the thorax has been shown to be reduced by approximately 25% and this level is retained during a maintained tilt, whilst that in the thigh increases by approximately 70%. To evaluate whether the electrical admittance of intracellular water (ICW) ...
Malkova D - - 2000
Prior exercise decreases postprandial plasma triacylglycerol (TG) concentrations, possibly through changes to skeletal muscle TG extraction. We measured postprandial substrate extraction across the leg in eight normolipidemic men aged 21-46 yr. On the afternoon preceding one trial, subjects ran for 2 h at 64 +/- 1% of maximal oxygen uptake ...
Ogita F - - 2000
PURPOSE: The purpose of this study was to determine the primary factors causing the differential oxygen uptake (VO2) response at submaximal intensities between one-legged and two-legged exercise, and whether peak oxygen uptake (VO2peak) increases in proportion to the increase in active muscle mass. METHODS: Two different types of exercise were ...
Franke W D - - 2000
To determine if the central command signal associated with isometric exercise is mass-dependent, 20 subjects (nine male, 11 female; 23 +/- 1 years) performed four 5-min bouts of supine isometric exercise with a large (quadriceps; LEG) and small (forearm; ARM) muscle mass. For each extremity, one bout entailed maintaining a ...
Shoemaker J K - - 2000
We examined the hypothesis that the increase in inactive leg vascular resistance during forearm metaboreflex activation is dissociated from muscle sympathetic nerve activity (MSNA). MSNA (microneurography), femoral artery mean blood velocity (FAMBV, Doppler), mean arterial pressure (MAP), and heart rate (HR) were assessed during fatiguing static handgrip exercise (SHG, 2 ...
Bouët V - - 2000
To determine how position sense depends on the functional state of the receptors involved, we assessed the accuracy of knee position sense before and after a moderate exercise on a cycle ergometer. Measurements were done on 32 healthy subjects with four protocols combining two tasks (intramodal: using the contralateral leg, ...
Billat V L - - 2000
This study examined the influence of light additional arm cranking exercise on the VO2 slow component observed during severe cycling exercise. During incremental tests, eleven triathletes exercised to exhaustion cycling with leg, cranking with arm and combined arm and leg cranking and cycling (arm work-rates being set at the third ...
Swaine I L - - 2000
PURPOSE: Previously, it has not been possible to compare power output of the arms and legs during simulated swimming using dry-land ergometry. The purpose of this study was to determine arm-pulling and leg-kicking power using isokinetic dry-land ergometry. METHODS: Twenty-two highly trained male swimmers of mean (+/- SD) age, 23 ...
Evetovich T K - - 2000
The purpose of the present investigation was to examine the effect of concentric isokinetic leg extension training on the mean power frequency (MPF) of the mechanomyographic (MMG) signal. Twenty-one men were assigned into a training (TRN; n = 12) or control (CTL; n = 9) group. The TRN group performed ...
Barstow T J - - 2000
A paired comparison of the peak and submaximal responses of oxygen uptake and heart rate in patients with spinal cord injury (SCI) performing voluntary arm cycle exercise and functional electrical stimulation (FES) leg cycling exercise. To test if the blunted heart rate response and slower rate of adjustment of oxygen ...
Anvar M D - - 2000
Oedema formation in lower limbs of patients with chronic critical limb ischaemia (CLI) is a common clinical feature. The rate of fluid filtration through the capillary wall depends on the capillary permeability, i.e. capillary filtration coefficient (CFC). In order to elucidate the pathogenesis of this ischaemic oedema, CFC was measured ...
MacDonald J R - - 2000
Nine recreationally active, borderline hypertensive subjects completed 30 min of arm ergometry (ARM) at 65% VO2 peak and 30 min of leg ergometry (LEG) at 70% VO2 Peak (randomised order). Blood pressure was monitored before and for 1 h after exercise using the Finapres method. Systolic, diastolic and mean blood ...
Calbet J A - - 2000
During submaximal exercise, muscle blood flow increases when arterial oxygen content (CaO2) is reduced. The increase in blood flow is brought about by elevating cardiac output (CO) and enhancing leg vascular conductance. Conversely, increased CaO2 elicits lower limb blood flow (LBF) and CO. During maximal exercise, the influence of CaO2 ...
Misiaszek J E JE Department of Physiology, University of Alberta, Edmonton, Canada. - - 2000
The contribution of afferent feedback to the regulation of locomotion in humans is not well understood. Animal experiments have suggested that loading of the leg during the stance phase may enhance the magnitude of extensor burst activity and delay the onset of swing phase. The aim of the present study ...
Schneider D A - - 2000
PURPOSE AND METHODS: The present study was conducted to examine the pattern of plasma catecholamine and blood lactate responses to incremental arm and leg exercise. Seven untrained male subjects performed two incremental exercise tests on separate days in random order. One test consisted of 1-arm cranking (5W x 2 min(-1)), ...
Howard R A RA - - 2000
We report five cases of vasovagal and vasodepressor syncope or near-syncope that occurred during arm cycle ergometry. In each case, arm exercise in the seated position had been performed immediately after dynamic leg exercise. A likely mechanism involves a decrease in preload from venous pooling of blood in the lower ...
Stranden E - - 2000
It is well established that prolonged sitting may lead to swelling of the lower extremities. However, activation of the vein pump system by repeated walking breaks or dynamic tiltable foot-rests have been shown to reduce foot and leg oedema. Some office chairs incorporate tilt mechanisms facilitating movements of the body ...
Juel C - - 2000
Interstitial K(+) concentrations were measured during one-legged knee-extensor exercise by use of microdialysis with probes inserted in the vastus lateralis muscle of the subjects. K(+) in the dialysate was measured either by flame photometry or a K(+)-sensitive electrode placed in the perfusion outlet. The correction for fractional K(+) recovery was ...
Nygren A T - - 2000
This research was performed to study how the cross-sectional area (CSA) changes in the skeletal muscles of exercising (E-leg) and contralateral non-exercising (N-leg) legs and to evaluate to what extent changes in CSA mirror changes in blood flow or extravascular water displacement. Seven healthy volunteers performed plantar flexion exercise at ...
Nygren A T - - 2000
The study was performed to evaluate if skeletal muscle perfusion can be determined during exercise using an IV bolus injection of Gd-DTPA. A fast spoiled gradient echo sequence (T1 weighted) was used with intermittent imaging during one-legged plantar flexion at different workloads. Between repetitive flexions, a 2-sec rest allowed magnetic ...
Burguera B - - 2000
We previously reported that epinephrine stimulates leg free fatty acid (FFA) release in men but not in women. The present studies were conducted to determine whether the same is true during exercise. Six men and six women bicycled for 90 min at 45% of peak O(2) consumption, during which time ...
Ben-Dov I - - 2000
BACKGROUND: Thoracic T(2-4) sympathectomy (TS) relieves palmar hyperhidrosis. These same roots innervate the heart and the lung. Thoracoscopic TS minimizes damage to the chest wall so that the effect of sympathectomy itself on these organs can be studied. We attempted to determine whether attenuated sympathetic output affects arm or leg ...
Chollet D - - 2000
This study analyzes stroke phases and arm and leg coordination during front crawl swimming as a function of swim velocity and performance level. Forty-three swimmers constituted three groups based on performance level. All swam at three different swim velocities, corresponding to the paces appropriate for the 800 m, 100 m, ...
Rådegran G - - 2000
It is not known whether the diameter of peripheral conduit arteries may impose a limitation on muscle blood flow and oxygen uptake at peak effort in humans, and it is not clear whether these arteries are dimensioned in relation to the tissue volume they supply or, rather, to the type ...
Harms C A - - 2000
Cardiac output is directed primarily to skeletal muscle during exercise. Recent investigations have examined how different groups of skeletal muscle compete for the cardiac output during exercise. To date, there is a lack of consistent findings on a blood flow steal effect of arm versus leg exercise, although the majority ...
Jacob G - - 2000
Sympathetic activation produced by various stimuli, eg, mental stress or handgrip, evokes regional vascular responses that are often nonhomogeneous. This phenomenon is believed to be the consequence of the recruitment of differential central neural pathways or of a sympathetically mediated vasodilation. The purpose of this study was to determine whether ...
Leyk D - - 1999
When studying the adjustment of muscle perfusion during exercise, the influence of central factors (e.g. blood volume, central blood pressure and venous return) can be reduced by choosing small muscle groups. In the present study parallel determinations of cardiac output (CO), leg blood flow (LBF) and pulmonary oxygen (VO2) uptake ...
Nguyen H T - - 1999
OBJECTIVE: To investigate the interexaminer reliability of the prone extended relative leg-length check as described by Activator Methods, Inc. SUBJECTS: Thirty-four subjects were selected from a pool of 52 consecutive patients visiting a private chiropractic office. METHODS: Exclusion criteria included congenital or acquired conditions known to affect lower extremity length ...
Green J M - - 1999
BACKGROUND: This study examined the use of Borg's category Ratings of Perceived Exertion (RPE) scale for prescribing and self-regulating swimming intensity. Subjects were males and females (n = 19) ages nineteen to fifty-eight who regularly swam for fitness. EXPERIMENTAL DESIGNS: Subjects completed six trials. Each trial was separated by a ...
Mittendorfer B - - 1999
BACKGROUND: Muscle glutamine is severely depleted in critically ill patients (by approximately 50% to 80% of normal). Because muscle protein breakdown, and thus the release of glutamine from muscle protein, is enhanced in response to metabolic stress, the depletion of intramuscular glutamine could be due to its impaired synthesis or ...
Gordon A - - 1999
BACKGROUND: Exercise capacity of patients with chronic heart failure (CHF) correlates poorly with estimates of cardiac function. Yet, it has been suggested that only patients without severely impaired cardiac output (CO) benefit from exercise training. Comparisons of different training models have not been made in the same study. AIMS: To ...
Mossberg K - - 1999
A direct comparison of synchronous versus asynchronous arm crank ergometry has not been carried out previously. Therefore, a comparative research design was employed. To assess the physiological responses of arm cranking when performed asynchronously (arms moving opposite to each other) versus synchronously (both arms moving in the same direction simultaneously). ...
Deschodt V J - - 1999
Eight male subjects were asked to swim 25 m at maximal velocity while the use of the arm(s) and legs was alternately restricted. Four situations were examined using one arm (1A), two arms (2A), one arm and two legs (1A2L) and both arms and legs (2A2L, normal swim) for propulsion. ...
Tulppo M P - - 1999
Heart rate (HR) is higher during dynamic arm exercise than during leg exercise at equal oxygen consumption levels, but the physiological background for this difference is not completely understood. The vagally mediated beat-to-beat R-R interval fluctuation decreases until the level of approximately 50% of maximal oxygen consumption during an incremental ...
Suzuki Y - - 1999
As a countermeasures for the decrease in maximal oxygen uptake (VO2max) during prolong simulated weightlessness, it has been suggested that intensive isotonic legs exercise was useful. The reason is possibly that a dynamic and intensive resistance exercise training makes to maintain not only the volume of exercising muscles but also ...
Raymond J - - 1999
PURPOSE: The purpose of this study was to assess the cardiorespiratory responses during arm exercise with and without concurrent electrical stimulation-induced leg cycling in people with paraplegia. METHODS: On separate days, 10 subjects with spinal cord injuries (T5-T12) performed either arm cranking (ACE), or simultaneous arm cranking + electrical stimulation-induced ...
Rådegran G - - 1999
The role of nitric oxide (NO) as a regulator of vasomotor tone has been investigated in resting and exercising human skeletal muscle. At rest, NO synthase (NOS) inhibition by intra-arterial infusion of NG-monomethyl-L-arginine decreased femoral artery blood flow (FABF, ultrasound Doppler) from 0.39 +/- 0.08 to 0.18 +/- 0.03 l/min ...
Tsuruike M - - 1999
The patellar tendon-tap stretch reflexes were examined in six neurologically healthy young subjects (mean age = 27.1 yrs) who had developed persistent quadriceps strength deficit due to ACL reconstruction. Each subject was tested on two separate days. A specially designed apparatus was used to examine the unilateral and conditioned patellar ...
Marsh G D - - 1999
The purpose of this study was to examine differences in the anaerobic exercise performance of young and older men. Eight healthy, active older (68.5 +/- 2.4 years old, mean S.D.) and eight healthy, active young (30.6 +/- 4.5 years old) subjects were assessed for peak and mean power output (PP ...
Stanton A W - - 1999
During orthostasis, capillary filtration pressure is higher in the leg than in the arm due to the effect of gravity. We investigated the possibility that the lymphatic network in leg skin might be adapted to cope with a greater fluid load. The dermal lymphatics of the forearm and lower leg ...
Biolo G - - 1999
We have determined the individual and combined effects of insulin and prior exercise on leg muscle protein synthesis and degradation, amino acid transport, glucose uptake, and alanine metabolism. Normal volunteers were studied in the postabsorptive state at rest and about 3 h after a heavy leg resistance exercise routine. The ...
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