Consulta: subjectFacets:"Myocardium"
Registros recuperados: 8
Data/hora: 16/06/2024 06:59:11

Left Ventricle Myocardium Volume Densities in Spontaneously Hypertensive Rats (SHR) Following Combination of Exercise and ACE Inhibitor Treatment: A Stereological Study
Provedor de dados: 77
Autores: Inuwa,I. M.; Hassan,M. O.; Ziada,A. M.
This study was designed to test the possible effects of a combination of physical and pharmacological therapy intervention on myocardial structure of the left ventricle in spontaneously hypertensive rats (SHR). Twelve weeks old spontaneously hypertensive rats (n = 40) were divided into four groups of sedentary, (Sed) as controls, exercise only (Exer), lisinopril only 20mg/kg/day (Lis), and exercise + lisinopril (LisExer). Exercise training was performed on a treadmill (5m/min.) for 60 minutes/day, 5 days/week for 10 weeks. At the end of 10 weeks, all the rats were terminally anaesthetised, the heart was arrested in diastole by intravenous procaine and whole animal perfusion fixation through the abdominal aorta was carried out using Karnovsky's fixative (pH...
Tipo: Journal article
Palavras-chave: Myocardium; Hypertrophy; ACE-inhibitor; Volume fraction; Exercise.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000200010

A possible relationship between gluconeogenesis and glycogen metabolism in rabbits during myocardial ischemia
Provedor de dados: 42
Autores: AGUIAR,RAQUEL R. DE; VALE,DANIELA F.; SILVA,RENATO M. DA; MUNIZ,YOLANDA P.; ANTUNES,FERNANDA; LOGULLO,CARLOS; OLIVEIRA,ANDRÉ L.A.; ALMEIDA,ADRIANA J. DE.
ABSTRACT Ischemia is responsible for many metabolic abnormalities in the heart, causing changes in organ function. One of modifications occurring in the ischemic cell is changing from aerobic to anaerobic metabolism. This change causes the predominance of the use of carbohydrates as an energy substrate instead of lipids. In this case, the glycogen is essential to the maintenance of heart energy intake, being an important reserve to resist the stress caused by hypoxia, using glycolysis and lactic acid fermentation. In order to study the glucose anaerobic pathways utilization and understand the metabolic adaptations, New Zealand white rabbits were subjected to ischemia caused by Inflow occlusion technique. The animals were monitored during surgery by pH and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gene expression; Glycogen; Ischemia; Myocardium; Rabbit.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401683

A single resistance exercise session improves myocardial contractility in spontaneously hypertensive rats
Provedor de dados: 56
Autores: Fernandes,A.A.; Faria,T. de O.; Ribeiro Júnior,R.F.; Costa,G.P.; Marchezini,B.; Silveira,E.A.; Angeli,J.K.; Stefanon,I.; Vassallo,D.V.; Lizardo,J.H.
Resistance training evokes myocardial adaptation; however, the effects of a single resistance exercise session on cardiac performance are poorly understood or investigated. This study aimed to investigate the effects of a single resistance exercise session on the myocardial contractility of spontaneously hypertensive rats (SHRs). Male 3-month-old SHRs were divided into two groups: control (Ct) and exercise (Ex). Control animals were submitted to sham exercise. Blood pressure was measured in conscious rats before the exercise session to confirm the presence of arterial hypertension. Ten minutes after the exercise session, the animals were anesthetized and killed, and the hearts were removed. Cardiac contractility was evaluated in the whole heart by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cardiac; Contractility; Myocardium; Proteins; Resistance exercise.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000900813

Inotropic effect of Citrus sinensis (L.) Osbeck leaf extracts on the guinea pig atrium
Provedor de dados: 56
Autores: Oliveira,E.D.; Leite,T.S.; Silva,B.A.; Conde-Garcia,E.A.
The objective of the present investigation was to determine the contractile effect of crude and acetone leaf extracts of Citrus sinensis (L.) Osb. on mammalian myocardium. Crude leaf extracts have been used in folk medicine to treat neurological disorders. Some flavonoids isolated from this plant presented a positive inotropic effect on myocardium. This motivated us to test the extracts on the atria of guinea pigs of both sexes (300-500 g) and surprisingly we observed inotropic depression instead of an increase in force. The maximum effect of the crude extract was 79.4 ± 8.1% of the control force amplitude (N = 5 hearts, 10 trials, 27 ± 0.1ºC, stimulus: 2 Hz, 400 V, 0.5 ms). The EC50 for crude, ethanol, acetic, aqueous, and acetone extracts was 300, 300,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Contractility; Heart; Myocardium; Woodworth phenomenon.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000100017

Duration-controlled swimming exercise training induces cardiac hypertrophy in mice
Provedor de dados: 56
Autores: Evangelista,F.S.; Brum,P.C.; Krieger,J.E.
Exercise training associated with robust conditioning can be useful for the study of molecular mechanisms underlying exercise-induced cardiac hypertrophy. A swimming apparatus is described to control training regimens in terms of duration, load, and frequency of exercise. Mice were submitted to 60- vs 90-min session/day, once vs twice a day, with 2 or 4% of the weight of the mouse or no workload attached to the tail, for 4 vs 6 weeks of exercise training. Blood pressure was unchanged in all groups while resting heart rate decreased in the trained groups (8-18%). Skeletal muscle citrate synthase activity, measured spectrophotometrically, increased (45-58%) only as a result of duration and frequency-controlled exercise training, indicating that endurance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exercise training; Swimming; Cardiac hypertrophy; Mice; Myocardium.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003001200018

Slaughterhouse blood as a perfusate for studying myocardial function under ischemic conditions
Provedor de dados: 56
Autores: Bendjelid,K.; Canet,E.; Gasche,Y.; Andre-Fouet,X.; Revel,D.; Janier,M.
Metabolic studies using the in vitro non-recirculating blood-perfused isolated heart model require large volumes of blood. The present study was designed to determine whether heterologous pig blood collected from a slaughterhouse can be used as perfusate for isolated pig hearts perfused under aerobic and constant reduced flow conditions. Eight isolated working pig hearts perfused for 90 min at a constant flow of 1.5 ml g-1 min-1 with non-recirculated blood diluted with Krebs-Henseleit bicarbonate buffer at a hematocrit of 23% were compared to eight hearts subjected to the same protocol but perfused only with Krebs-Henseleit bicarbonate buffer solution. Hearts were paced at 100 bpm and subjected to aerobic perfusion at 38ºC. Hearts were weighed before...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Myocardium; Ischemia; Erythrocytes; Edema; Reperfusion injury.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000100006

Inhibition of the sarcoplasmic reticulum Ca2+ pump with thapsigargin to estimate the contribution of Na+-Ca2+ exchange to ventricular myocyte relaxation
Provedor de dados: 56
Autores: Bassani,R.A.; Bassani,J.W.M.
Relaxation in the mammalian ventricle is initiated by Ca2+ removal from the cytosol, which is performed by three main transport systems: sarcoplasmic reticulum Ca2+-ATPase (SR-A), Na+-Ca2+ exchanger (NCX) and the so-called slow mechanisms (sarcolemmal Ca2+-ATPase and mitochondrial Ca2+ uptake). To estimate the relative contribution of each system to twitch relaxation, SR Ca2+ accumulation must be selectively inhibited, usually by the application of high caffeine concentrations. However, caffeine has been reported to often cause changes in membrane potential due to NCX-generated inward current, which compromises the reliability of its use. In the present study, we estimated integrated Ca2+ fluxes carried by SR-A, NCX and slow mechanisms during twitch...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Myocardium; Relaxation; Calcium fluxes; Sodium-calcium exchanger; Sarcoplasmic reticulum calcium ATPase; Caffeine.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003001200014

Anabolic steroid- and exercise-induced cardiac stress protein (HSP72) in the rat
Provedor de dados: 56
Autores: Lunz,W.; Oliveira,E.C.; Neves,M.T.D.; Fontes,E.P.B.; Dias,C.M.G.C.; Natali,A.J.
The present study investigated the effects of exercise and anabolic-androgenic steroids on cardiac HSP72 expression. Male Wistar rats were divided into experimental groups: nandrolone exercise (NE, N = 6), control exercise (CE, N = 6), nandrolone sedentary (NS, N = 6), and control sedentary (CS, N = 6). Animals in the NE and NS groups received a weekly intramuscular injection (6.5 mg/kg of body weight) of nandrolone decanoate, while those in the CS and CE groups received mineral oil as vehicle. Animals in the NE and CE groups were submitted to a progressive running program on a treadmill, for 8 weeks. Fragments of the left ventricle were collected at sacrifice and the relative immunoblot contents of HSP72 were determined. Heart weight to body weight ratio...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Physical activity; Nandrolone; Myocardium; Heat shock protein.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000700006