Beta-blockade and oxygen delivery to muscle during exercise.

abstract：:We hypothesized that the respiratory baroreflex in conscious rats is either more transient, or has a higher pressure threshold than in other species. To characterize the effect of arterial pressure changes on respiration in conscious rats, ventilation (V) was measured by the plethysmographic technique during injection...

journal_title：Canadian journal of physiology and pharmacology

authors： Walker JK,Jennings DB

更新日期：1998-07-01 00:00:00

abstract：:Single-electrode voltage-clamp experiments were made on CA1 neurons in the presence of tetrodotoxin and K channel blockers. Applications of halothane (1-3% v/v) for 3-10 min caused a similar marked and reversible depression of slow inward currents (probably Ca currents) evoked by depolarizing pulses from a holding pot...

journal_title：Canadian journal of physiology and pharmacology

authors： Krnjević K,Puil E

更新日期：1988-12-01 00:00:00

abstract：:Activity-related transient changes in extracellular K+ concentration ([K+]c), extracellular pH (pHc), and extracellular volume (EC volume) were studied by means of ion-selective microelectrodes in the adult rat spinal cord in vivo and in neonatal rat spinal cords isolated from pups 3-14 days of age. Repetitive electri...

journal_title：Canadian journal of physiology and pharmacology

authors： Syková E,Jendelová P,Svoboda J,Chvátal A

更新日期：1992-01-01 00:00:00

abstract：:Molecular mechanisms by which exercise exerts cardiovascular benefits are poorly understood. Exercise-induced increase of endothelial NO synthase (eNOS) phosphorylation through the protein kinase Akt has been shown to be a key mechanism underlying the beneficial effect of exercise in coronary artery disease patients. ...

journal_title：Canadian journal of physiology and pharmacology

authors： Pellegrin M,Miguet-Alfonsi C,Berthelot A,Mazzolai L,Laurant P

更新日期：2011-01-01 00:00:00

abstract：:The utilization of triacylglycerol in slow oxidative, fast oxidative-glycolytic, and fast glycolytic skeletal muscle fiber types was examined in rats subjected to a prolonged exhaustive swim. Significant reductions of intramuscular triacylglycerol occurred following 2 h and 40 min of swimming in all muscles containing...

journal_title：Canadian journal of physiology and pharmacology

authors： Spriet LL,Peters SJ,Heigenhauser GJ,Jones NL

更新日期：1985-06-01 00:00:00

abstract：:Impaired nitric oxide (NO) activity is associated with an increase in blood pressure in rats. Voltage-regulated calcium channels are believed to participate in this hemodynamic event. To further test this hypothesis, we examined the effect of nimodipine and verapamil (calcium antagonists) on the pressor activity of di...

journal_title：Canadian journal of physiology and pharmacology

authors： Rioux F,St-Pierre M,Harvey N,Moisan S,Burhop KE,Drapeau G

更新日期：1998-10-01 00:00:00

abstract：:The vascular inflammatory process has been suggested to play a key role in the initiation and progression of atherosclerosis, a major complication of diabetes mellitus. Thus, in this study, we attempted to determine whether 2 structurally related flavonoids found in Cyclopia subternata, vicenin-2 and scolymoside, can ...

journal_title：Canadian journal of physiology and pharmacology

authors： Ku SK,Bae JS

更新日期：2016-03-01 00:00:00

abstract：:We examined the interaction of smooth muscle myosin with alpha-actin and beta-actin isoforms during the contraction of A7r5 smooth muscle cells and rat aortic smooth muscle. The techniques of confocal microscopy and fluorescence resonance energy transfer (FRET) analysis were utilized in examining A7r5 cells and rat ao...

journal_title：Canadian journal of physiology and pharmacology

authors： Black J,Dykes A,Thatcher S,Brown D,Bryda EC,Wright GL

更新日期：2009-05-01 00:00:00

abstract：:We characterized the innervation of isolated circular and longitudinal-oriented muscle strips from the nulliparous rabbit uterus and cervix by field stimulation (FS). FS with increasing frequency (2.5-50 pps) and voltage (2.5-70 V) caused graded increases in isometric contraction with no relaxation or inhibition of sp...

journal_title：Canadian journal of physiology and pharmacology

authors： Bulat R,Kannan MS,Garfield RE

更新日期：1989-08-01 00:00:00

abstract：:Pertussis toxin (PTX) is a heterohexameric protein, which is divided into subunits A and B. The A-subunit (protomer) possesses adenine diphosphate (ADP) ribosyltransferase activity, and the B-oligomer confers cell surface binding specificity on the toxin. By virtue of the ADP-ribosylation activity in the A-subunit, PT...

journal_title：Canadian journal of physiology and pharmacology

authors： Wong WS,Rosoff PM

更新日期：1996-05-01 00:00:00

abstract：:The effects of two structurally similar pyrazine derivatives, tetramethylpyrazine (TMP) and tetraethylpyrazine (TEP) on the contractile responses of dog saphenous vein to KCl (via membrane depolarization), phenylephrine (PHE, alpha 1-adrenergic agonist), and B-HT 920 (alpha 2-adrenergic agonist) were investigated. The...

journal_title：Canadian journal of physiology and pharmacology

authors： Wang ZL,Kwan CY,Ohta A,Chen MC

更新日期：1991-08-01 00:00:00

abstract：:Changes in force and stiffness during contractions of mouse extensor digitorum longus and soleus muscles were measured over a range of extracellular pH from 6.4 to 7.4. Muscle stiffness was measured using small amplitude (less than 0.1% of muscle length), high frequency (1.5 kHz) oscillations in length. Twitch force w...

journal_title：Canadian journal of physiology and pharmacology

authors： Renaud JM,Stein RB,Gordon T

更新日期：1987-08-01 00:00:00

abstract：:Plasma and serum of healthy subjects apparently contain a precursor form of renin, or 'prorenin,' which can be activated by the ice-cold temperature at which samples are customarily handled for prolonged periods in laboratories and blood banks. The effect of such prior cryoactivation for 9 days at 4 degrees C is to in...

journal_title：Canadian journal of physiology and pharmacology

authors： Osmond DH,Cooper RM

更新日期：1978-10-01 00:00:00

abstract：:The blood volume of anesthetized rats was expanded acutely by 33% with donor blood while a caval snare was gradually tightened so that right atrial pressure (RAP) was prevented from rising (n = 6). In control experiments (n = 5) an aortic snare was used to hold mean arterial blood pressure near the values found in the...

journal_title：Canadian journal of physiology and pharmacology

authors： Ackermann U,Rudolph JR

更新日期：1984-07-01 00:00:00

abstract：:In experiments on isolated guinea pig papillary muscles the effects of verapamil (5 mg/L) and caffeine (1 g/L) on the two-component contraction were investigated. The muscles were continuously superfused with normal Tyrode's solution containing 2 mg of noradrenaline/L at 20--22 degrees C. The first derivative of contr...

journal_title：Canadian journal of physiology and pharmacology

authors： Bogdanov KY,Zakharov SI,Rosenshtraukh LV

更新日期：1979-08-01 00:00:00

abstract：:Angiotensin II (ANG II) and vasopressin (AVP) are two powerful vasoconstrictors, and atrial natriuretic peptide (ANP) is a potent vasorelaxant. The changes in the density or affinity of binding sites for these agents that may alter target organ responsiveness in hypertension are reviewed. ANG II binding in mesenteric ...

journal_title：Canadian journal of physiology and pharmacology

authors： Schiffrin EL

更新日期：1989-09-01 00:00:00

abstract：:The heat production (HP), heart rate (HR), respiration rate, rumen motility, and body temperature responses to 2.5-h adrenaline (A) and noradrenaline (NA) intrajugular infusions at 0.00, 0.15, 0.30, 0.60, and 0.90 micrograms.kg-1.min-1 were studied in 10 shorn wethers which had been chronically (3-8 weeks) exposed to ...

journal_title：Canadian journal of physiology and pharmacology

authors： Graham AD,Christopherson RJ

更新日期：1981-09-01 00:00:00

abstract：:This study was designed to investigate whether and how triiodothyronine (T3) affects renal function in an experimental model of chronic kidney disease. Twenty-four female rats were divided into the following groups: sham-operated control group (n = 8), 5/6 nephrectomized group (Nx, n = 8), and 5/6 nephrectomized group...

journal_title：Canadian journal of physiology and pharmacology

authors： El Agaty SM

更新日期：2018-06-01 00:00:00

abstract：:The effect of one bout of acute exercise on impaired glucose metabolism was studied in obese (480 +/- 20 g), untrained rats, at rest (n = 10) and after 60 min of swimming (n = 5). Using the euglycemic, hyperinsulinemic (10 mU.kg-1 x min-1) clamp, glucose clearance rate increased from 7.6 +/- 0.9 at rest to 9.7 +/- 0.5...

journal_title：Canadian journal of physiology and pharmacology

authors： Burstein R,Zissholtz A,Zick-Bachar Y,Epstein Y,Shapiro Y,Karnieli E

更新日期：1992-11-01 00:00:00

abstract：:Altered sympathetic nervous activity has been linked to the development and persistence of obesity, partly relating to overfeeding. Binding of the selective, positron-emitting phosphodiesterase-4 (PDE4) inhibitor (R)-[11C]rolipram provides a direct index of the cAMP-hydrolyzing enzyme PDE4. This study examines progres...

journal_title：Canadian journal of physiology and pharmacology

authors： Greene M,Thackeray JT,Kenk M,Thorn SL,Bevilacqua L,Harper ME,Beanlands RS,Dasilva JN

更新日期：2009-03-01 00:00:00

abstract：:The anticonvulsant activity of delta9-tetrahydrocannabinol (delta9-THC) has been determined against seizures induced in epileptic chickens by intermittent photic stimulation (IPS) and in epileptic and nonepileptic chickens by Metrazol. Intravenous administration of the drug reduced both the severity and incidence of s...

journal_title：Canadian journal of physiology and pharmacology

authors： Johnson DD,McNeill JR,Crawford RD,Wilcox WC

更新日期：1975-12-01 00:00:00

abstract：:Mechanisms leading to ifosfamide (IF)-induced renal damage have not been fully elucidated. Recent work suggests that localized renal tubular metabolism of IF and the production of the nephrotoxic chloroacetaldehyde may lead to nephrotoxicity. Presently no pharmacological method to reduce IF nephrotoxicity has been ide...

journal_title：Canadian journal of physiology and pharmacology

authors： Aleksa K,Halachmi N,Ito S,Koren G

更新日期：2005-06-01 00:00:00

abstract：:The effect of various doses of i.p. injection of the adenosine receptor agonist (R)-phenylisopropyladenosine (R-PIA), ranging from nanomolar to micromolar concentrations, on plasma levels of free fatty acids, glucose, insulin, glucagon, ACTH, and corticosterone was examined in 200-g male rats. At the lowest dose of R-...

journal_title：Canadian journal of physiology and pharmacology

authors： LeBlanc J,Soucy J

更新日期：1994-02-01 00:00:00

abstract：:Magnesium probably protects brain tissue against the effects of cerebral ischemia, brain injury and stroke through its actions as a calcium antagonist and inhibitor of excitatory amino acids. The effects of magnesium sulfate on cerebrovascular permeability to a dye, Evans blue, were studied during insulin-induced hypo...

journal_title：Canadian journal of physiology and pharmacology

authors： Kaya M,Küçük M,Kalayci RB,Cimen V,Gürses C,Elmas I,Arican N

更新日期：2001-09-01 00:00:00

abstract：:The effects of leukotrienes (LTs) have been widely studied in the isolated perfused mammalian heart; however, little is known about the effect or metabolism of LTs in the isolated bullfrog heart. Isolated perfused bullfrog hearts were administered randomized doses of LTC4, LTD4, or LTE4. The cardiac parameters of hear...

journal_title：Canadian journal of physiology and pharmacology

authors： Herman RP,Heller RS,Canavan CM,Herman CA

更新日期：1988-08-01 00:00:00

abstract：:Neonatal hyperthyroidism in rats induced by daily administration of L-triiodothyronine for 30 days since birth resulted in a significant rise in mobility and the metabolism of brain norepinephrine and dopamine. Whereas administration of lithium carbonate (60 mg/kg ip) to normal rats for 6 days produced no effect on sp...

journal_title：Canadian journal of physiology and pharmacology

authors： Rastogi RB,Singhal RL

更新日期：1977-06-01 00:00:00

abstract：:The metabolism of endogenous and exogenous diacylglycerol (DG) was studied in SM-3 cells derived from rabbit aortic smooth muscle to determine the biochemical step(s) responsible for degrading DG second messengers. Incubation of growth-arrested SM-3 cells with [3H]myristate for 2 h resulted in selective labelling of c...

journal_title：Canadian journal of physiology and pharmacology

authors： Migas I,Chuang M,Sasaki Y,Severson DL

更新日期：1997-10-01 00:00:00

abstract：:The kinetics of sodium gradient dependent phosphate uptake by the renal brush border membrane vesicles of the rat have ben studied under various conditions of temperature and pH. From 7 to 30 degrees C the Lineweaver-Burk plots are linear, and the apparent Km progressively increases from 54 to 91 microM. Above 30 degr...

journal_title：Canadian journal of physiology and pharmacology

authors： Brunette MG,Beliveau R,Chan M

更新日期：1984-02-01 00:00:00

abstract：:This study was designed to determine if tonic beta-adrenergic control of plasma renin activity (PRA) during dietary sodium restriction is due to stimulation of renal beta-adrenoceptors, extrarenal beta-adrenoceptors, or both. Experiments were performed in six conscious resting uninephrectomized dogs with chronically i...

journal_title：Canadian journal of physiology and pharmacology

authors： Blair ML,Gengo FM

更新日期：1995-08-01 00:00:00

abstract：:Diamine oxidase activity was measured in the intestinal mucosa, lymph, and in the serum of rats, to determine whether histamine, a substrate of diamine oxidase, liberates this enzyme from its mucosal storage site(s). Histamine induced a sharp rise in intestinal lymph flow, lymph protein, and lymph diamine oxidase, las...

journal_title：Canadian journal of physiology and pharmacology

authors： Wollin A,Navert H

更新日期：1983-04-01 00:00:00