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Reproducibility of heart rate variability parameters measured in healthy subjects at rest and after a postural change maneuver BJMBR
Dantas,E.M.; Gonçalves,C.P.; Silva,A.B.T.; Rodrigues,S.L.; Ramos,M.S.; Andreão,R.V.; Pimentel,E.B.; Lunz,W.; Mill,J.G..
Heart rate variability (HRV) provides important information about cardiac autonomic modulation. Since it is a noninvasive and inexpensive method, HRV has been used to evaluate several parameters of cardiovascular health. However, the internal reproducibility of this method has been challenged in some studies. Our aim was to determine the intra-individual reproducibility of HRV parameters in short-term recordings obtained in supine and orthostatic positions. Electrocardiographic (ECG) recordings were obtained from 30 healthy subjects (20-49 years, 14 men) using a digital apparatus (sampling ratio = 250 Hz). ECG was recorded for 10 min in the supine position and for 10 min in the orthostatic position. The procedure was repeated 2-3 h later. Time and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Heart rate variability; Power spectral analysis; Reproducibility; Autonomic nervous system.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010001000010
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Effects of chronic treadmill training on body mass gain and visceral fat accumulation in overfed rats BJMBR
Dantas,E.M.; Pimentel,E.B.; Gonçalves,C.P.; Lunz,W.; Rodrigues,S.L.; Mill,J.G..
This study evaluated the effects of chronic treadmill training on body mass gain and visceral fat accumulation in overfed rats. Overfeeding was induced by reducing the litter size to 3 male pups per mother during the suckling period. The litter size of control rats was adjusted to 10 male pups per mother. Seven weeks after birth overfed and normally fed rats were selected and assigned to a sedentary protocol or to a low-intensity treadmill training protocol (60 min, 5 times/week, for 9 weeks). Four groups (overfed sedentary, N = 23; normally fed sedentary, N = 32; overfed exercised, N = 18, and normally fed exercised, N = 18) were evaluated at 18 weeks. Data are reported as means ± SEM. Initial body weight was similar in control and overfed rats [8.0 ± 0.2...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Obesity; Exercise; Abdominal fat; Overfeeding.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010000500014
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Chronic aerobic exercise associated to low-dose L-NAME improves contractility without changing calcium handling in rat cardiomyocytes BJMBR
Luchi,T.C.; Coelho,P.M.; Cordeiro,J.P.; Assis,A.L.E.M.; Nogueira,B.V.; Marques,V.B.; dos Santos,L.; Lima-Leopoldo,A.P.; Lunz,W.; Leopoldo,A.S..
Nitric oxide (NO) inhibition by high-dose NG-nitro-L-arginine methyl ester (L-NAME) is associated with several detrimental effects on the cardiovascular system. However, low-dose L-NAME increases NO synthesis, which in turn induces physiological cardiovascular benefits, probably by activating a protective negative feedback mechanism. Aerobic exercise, likewise, improves several cardiovascular functions in healthy hearts, but its effects are not known when chronically associated with low-dose L-NAME. Thus, we tested whether the association between low-dose L-NAME administration and chronic aerobic exercise promotes beneficial effects to the cardiovascular system, evaluating the cardiac remodeling process. Male Wistar rats were randomly assigned to control...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nitric oxide; Aerobic exercise; Cardiac remodeling; Cardiomyocyte; Calcium.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2020000300611
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Anabolic steroid- and exercise-induced cardiac stress protein (HSP72) in the rat BJMBR
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
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Long-term aerobic swimming training by rats reduces the number of aberrant crypt foci in 1,2-dimethylhydrazine-induced colon cancer BJMBR
Lunz,W.; Peluzio,M.C.G.; Dias,C.M.G.C.; Moreira,A.P.B.; Natali,A.J..
We determined the effect of long-term aerobic swimming training regimens of different intensities on colonic carcinogenesis in rats. Male Wistar rats (11 weeks old) were given 4 subcutaneous injections (40 mg/kg body weight each) of 1,2-dimethyl-hydrazine (DMH, dissolved in 0.9% NaCl containing 1.5% EDTA, pH 6.5), at 3-day intervals and divided into three exercise groups that swam with 0% body weight (EG1, N = 11), 2% body weight (EG2, N = 11), and 4% body weight of load (EG3, N = 10), 20 min/day, 5 days/week for 35 weeks, and one sedentary control group (CG, N = 10). At sacrifice, the colon was removed and counted for tumors and aberrant crypt foci. Tumor size was measured and intra-abdominal fat was weighed. The mean number of aberrant crypt foci was...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Physical exercise Exercise intensity 1; 2-Dimethylhydrazine Colorectal carcinoma Aberrant crypt foci.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008001100009
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Fish oil ingestion reduces the number of aberrant crypt foci and adenoma in 1,2-dimethylhydrazine-induced colon cancer in rats BJMBR
Moreira,A.P.B.; Sabarense,C.M.; Dias,C.M.G.C.; Lunz,W.; Natali,A.J.; Glória,M.B.A.; Peluzio,M.C.G..
We determined the effect of fish oil (FO) ingestion on colonic carcinogenesis in rats. Male Wistar rats received 4 subcutaneous injections (40 mg/kg body weight each) of 1,2-dimethylhydrazine (DMH) at 3-day intervals and were fed a diet containing 18% by weight FO (N = 10) or soybean oil (SO, N = 10) for 36 weeks. At sacrifice, the colon was removed, aberrant crypt foci were counted and the fatty acid profile was determined. Intestinal tumors were removed and classified as adenoma or carcinoma. Liver and feces were collected and analyzed for fatty acid profile. FO reduced the mean (± SEM) number of aberrant crypt foci compared to SO (113.55 ± 6.97 vs 214.60 ± 18.61; P < 0.05) and the incidence of adenoma (FO: 20% vs SO: 100%), but carcinoma occurred...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Colonic aberrant crypt foci; Colorectal cancer prevention; Colorectal tumor; Omega-3 fatty acids; Polyamines.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009001200008
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Cardiac protein expression patterns are associated with distinct inborn exercise capacity in non-selectively bred rats BJMBR
Ribeiro,L.P.; Freitas-Lima,L.C.; Naumann,G.B.; Meyrelles,S.S.; Lunz,W.; Pires,S.F.; Andrade,H.M.; Carnielli,J.B.T.; Figueiredo,S.G..
In the present study, we successfully demonstrated for the first time the existence of cardiac proteomic differences between non-selectively bred rats with distinct intrinsic exercise capacities. A proteomic approach based on two-dimensional gel electrophoresis coupled to mass spectrometry was used to study the left ventricle (LV) tissue proteome of rats with distinct intrinsic exercise capacity. Low running performance (LRP) and high running performance (HRP) rats were categorized by a treadmill exercise test, according to distance run to exhaustion. The running capacity of HRPs was 3.5-fold greater than LRPs. Protein profiling revealed 29 differences between HRP and LRP rats (15 proteins were identified). We detected alterations in components involved in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Inborn aerobic capacity; Proteomics; 2-DE; MS; Heart proteins.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000300609
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Kinetics of cardiac and vascular remodeling by spontaneously hypertensive rats after discontinuation of long-term captopril treatment BJMBR
Rocha,W.A.; Lunz,W.; Baldo,M.P.; Pimentel,E.B.; Dantas,E.M.; Rodrigues,S.L.; Mill,J.G..
Angiotensin-converting enzyme inhibitors reduce blood pressure and attenuate cardiac and vascular remodeling in hypertension. However, the kinetics of remodeling after discontinuation of the long-term use of these drugs are unknown. Our objective was to investigate the temporal changes occurring in blood pressure and vascular structure of spontaneously hypertensive rats (SHR). Captopril treatment was started in the pre-hypertensive state. Rats (4 weeks) were assigned to three groups: SHR-Cap (N = 51) treated with captopril (1 g/L) in drinking water from the 4th to the 14th week; SHR-C (N = 48) untreated SHR; Wistar (N = 47) control rats. Subgroups of animals were studied at 2, 4, and 8 weeks after discontinuation of captopril. Direct blood pressure was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: SHR; Cardiac hypertrophy; Aorta remodeling; ACE inhibition; Captopril.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010000400010
Registros recuperados: 8
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