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Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 8
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A pulsatile flow model for in vitro quantitative evaluation of prosthetic valve regurgitation BJMBR
Giuliatti,S.; Gallo Jr.,L.; Almeida-Filho,O.C.; Schmidt,A.; Marin-Neto,J.A.; Pelá,C.A.; Maciel,B.C..
A pulsatile pressure-flow model was developed for in vitro quantitative color Doppler flow mapping studies of valvular regurgitation. The flow through the system was generated by a piston which was driven by stepper motors controlled by a computer. The piston was connected to acrylic chambers designed to simulate "ventricular" and "atrial" heart chambers. Inside the "ventricular" chamber, a prosthetic heart valve was placed at the inflow connection with the "atrial" chamber while another prosthetic valve was positioned at the outflow connection with flexible tubes, elastic balloons and a reservoir arranged to mimic the peripheral circulation. The flow model was filled with a 0.25% corn starch/water suspension to improve Doppler imaging. A continuous flow...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Flow model; Echocardiography; Valvular regurgitation.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000300013
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Autonomic modulation of heart rate of young and postmenopausal women undergoing estrogen therapy BJMBR
Neves,V.F.C.; Silva de Sá,M.F.; Gallo Jr.,L.; Catai,A.M.; Martins,L.E.B.; Crescêncio,J.C.; Perpétuo,N.M.; Silva,E..
The aim of the present study was to determine whether estrogen therapy (ET) reduces alterations of the autonomic control of heart rate (HR) due to hypoestrogenism and aging. Thirteen young (24 ± 2.6 years), 10 postmenopausal (53 ± 4.6 years) undergoing ET (PM-ET), and 14 postmenopausal (56 ± 2.6 years) women not undergoing ET (PM) were studied. ET consisted of 0.625 mg/day conjugated equine estrogen. HR was recorded continuously for 8 min at rest in the supine and sitting positions. HR variability (HRV) was analyzed by time (SDNN and rMSSD indices) and frequency domain methods. Power spectral components are reported as normalized units (nu) at low (LF) and high (HF) frequencies, and as LF/HF ratio. Intergroup comparisons: SDNN index was higher in young...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Heart rate variability; Aging; Menopause; Estrogen therapy.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007000400007
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Comparison of anaerobic threshold determined by visual and mathematical methods in healthy women BJMBR
Higa,M.N.; Silva,E.; Neves,V.F.C.; Catai,A.M.; Gallo Jr.,L.; Silva de Sá,M.F..
Several methods are used to estimate anaerobic threshold (AT) during exercise. The aim of the present study was to compare AT obtained by a graphic visual method for the estimate of ventilatory and metabolic variables (gold standard), to a bi-segmental linear regression mathematical model of Hinkley's algorithm applied to heart rate (HR) and carbon dioxide output (VCO2) data. Thirteen young (24 ± 2.63 years old) and 16 postmenopausal (57 ± 4.79 years old) healthy and sedentary women were submitted to a continuous ergospirometric incremental test on an electromagnetic braking cycloergometer with 10 to 20 W/min increases until physical exhaustion. The ventilatory variables were recorded breath-to-breath and HR was obtained beat-to-beat over real time. Data...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anaerobic threshold; Incremental test; Graphic visual method; Mathematical model; Hinkley's algorithm.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007000400008
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Evaluation of electromyographic activity and heart rate responses to isometric exercise. The role played by muscular mass and type BJMBR
Silva,E.; Oliveira,L.; Catai,A.M.; Ferreira-Filho,P.; Bérzin,F.; Gallo Jr.,L..
The purpose of the present study was to examine the relationship between the electromyographic (EMG) activity and heart rate (HR) responses induced by isometric exercise performed by knee extension (KE) and flexion (KF) in men. Fifteen healthy male subjects, 21 ± 1.3 years (mean ± SD), were submitted to KE and KF isometric exercise tests at 100% of maximal voluntary contraction (MVC). The exercises were performed with one leg (right or left) and with two legs simultaneously, for 10 s in the sitting position with the hip and knee flexed at 90o. EMG activity (root mean square values) and HR (beats/min) were recorded simultaneously both at rest and throughout the sustained contraction. The HR responses to isometric exercise in KE and KF were similar when...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Knee; Isometric exercise; Heart rate; Electromyography; Rectus femoris; Biceps femoris.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000100017
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Heart rate variability under resting conditions in postmenopausal and young women BJMBR
Ribeiro,T.F.; Azevedo,G.D.; Crescêncio,J.C.; Marães,V.R.F.S.; Papa,V.; Catai,A.M.; Verzola,R.M.M.; Oliveira,L.; Silva de Sá,M.F.; Gallo Jr.,L.; Silva,E..
The aim of the present study was to compare the modulation of heart rate in a group of postmenopausal women to that of a group of young women under resting conditions on the basis of R-R interval variability. Ten healthy postmenopausal women (mean ± SD, 58.3 ± 6.8 years) and 10 healthy young women (mean ± SD, 21.6 ± 0.82 years) were submitted to a control resting electrocardiogram (ECG) in the supine and sitting positions over a period of 6 min. The ECG was obtained from a one-channel heart monitor at the CM5 lead and processed and stored using an analog to digital converter connected to a microcomputer. R-R intervals were calculated on a beat-to-beat basis from the ECG recording in real time using a signal-processing software. Heart rate variability (HRV)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Heart rate variability; Menopause; Autonomic nervous system; Time domain indexes.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000700006
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Identification of anaerobic threshold using heart rate response during dynamic exercise BJMBR
Marães,V.R.F.S.; Silva,E.; Catai,A.M.; Novais,L.D.; Moura,M.A.S.; Oliveira,L.; Gallo Jr.,L..
The objective of the present study was to characterize the heart rate (HR) patterns of healthy males using the autoregressive integrated moving average (ARIMA) model over a power range assumed to correspond to the anaerobic threshold (AT) during discontinuous dynamic exercise tests (DDET). Nine young (22.3 ± 1.57 years) and 9 middle-aged (MA) volunteers (43.2 ± 3.53 years) performed three DDET on a cycle ergometer. Protocol I: DDET in steps with progressive power increases of 10 W; protocol II: DDET using the same power values as protocol 1, but applied randomly; protocol III: continuous dynamic exercise protocol with ventilatory and metabolic measurements (10 W/min ramp power), for the measurement of ventilatory AT. HR was recorded and stored beat-to-beat...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Heart rate; Anaerobic threshold; Dynamic physical exercise; Autonomic nervous system; Healthy male volunteers.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000500010
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Pulmonary function, cholinergic bronchomotor tone, and cardiac autonomic abnormalities in type 2 diabetic patients BJMBR
Melo,E.; Vianna,E.O.; Gallo Jr.,L.; Foss,M.C.; Terra-Filho,J..
This prospective study analyzed the involvement of the autonomic nervous system in pulmonary and cardiac function by evaluating cardiovascular reflex and its correlation with pulmonary function abnormalities of type 2 diabetic patients. Diabetic patients (N = 17) and healthy subjects (N = 17) were evaluated by 1) pulmonary function tests including spirometry, He-dilution method, N2 washout test, and specific airway conductance (SGaw) determined by plethysmography before and after aerosol administration of atropine sulfate, and 2) autonomic cardiovascular activity by the passive tilting test and the magnitude of respiratory sinus arrhythmia (RSA). Basal heart rate was higher in the diabetic group (87.8 ± 11.2 bpm; mean ± SD) than in the control group (72.9...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diabetes mellitus; Autonomic nervous system; Autonomic neuropathy; Heart rate variability; Blood pressure variability.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000300002
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Role of bradykinin in postprandial hypotension in humans BJMBR
Tumilero,S.; Gallo Jr.,L.; Foss,M.C.; Gouveia,L.M.F.; Reis,M.L.; Rothschild,A.M..
A transient significant decrease in mean arterial blood pressure (MAP) from 107 ± 3 to 98 ± 3 mmHg (P<0.05) was observed in elderly (59-69 years of age), healthy volunteers 25-30 min following ingestion of a test meal. In young volunteers (22-34 years of age), a postprandial decrease of MAP from 88 ± 3 to 83 ± 4 mmHg was also noted but it was not statistically significant. A 40% decrease in bradykinin (BK) content of circulatory high molecular weight kininogen had previously been observed in human subjects given the same test meal. We presently demonstrate by specific ELISA that the stable pentapeptide metabolite (1-5 BK) of BK increases from 2.5 ± 1.0 to 11.0 ± 2.5 pg/ml plasma (P<0.05) in elderly volunteers and from 2.0 ± 1.0 to 10.3 ± 3.2...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bradykinin; Postprandial hypotension; Indocyanine green; Captopril; 1-5 bradykinin.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000600015
Registros recuperados: 8
Primeira ... 1 ... Última
 

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