Baroreflex Sensitivity
Mostrando 25-36 de 70 artigos, teses e dissertações.
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25. Efeito do treinamento físico no controle barorreflexo da atividade nervosa simpática e freqüência cardíaca em indivíduos hipertensos / The effects of exercise training on baroreflex control of sympathetic nerve activity and heart rate in hypertensive patients
Previous studies demonstrated that exercise training improves the baroreflex control of heart rate in spontaneously hypertensive rats. However, the effects of exercise training on baroreflex control of sympathetic nerve activity and heart rate in patients with hypertension are unknown. We hypothesized that exercise training would improve baroreflex control o
Publicado em: 2007
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26. Estudo da neurotransmissão do quimiorreflexo e do barorreflexo na área A5 de ratos não anestesiados
The circulatory system is essential for the maintenance of body homeostasis. Neural regulation of the cardiovascular system involves the activation of several groups of peripheral sensors that generates the information to central nervous system, with consequent modulation of the autonomic nervous system. Among the peripheral sensors the arterial baroreceptor
Publicado em: 2007
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27. Efeito do citrato de sildenafil sobre o controle autonômico cardiovascular em ratos normotensos.
Sildenafil citrate (Viagra) is a broadly used agent to treat erectile dysfunction. Several clinical trials, however, have demonstrated that in heart diseased patients in use of organic nitrates, the association with sildenafil could significantly enhance cardiac events risk. The possible mechanisms implicated in this increased risk are not completely
Publicado em: 2007
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28. Reflexos cardiovasculares em camundongos com alteração na expressão do receptor da Angiotensina-(1-7), MAS
Several substances may modulate reflex cardiovascular activity, such reninangiotensin system peptides. The tecidual renin-angiotensin system is involved in regulation of cardiovascular structures and functions and, consequently in long-term blood pressure control, contributing in a significant way to maintenance and development of high peripheral resistance
Publicado em: 2007
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29. Alterações de Parâmetros Cardiovasculares e Envolvimento dos Receptores AT2 na CVLM sobre a Pressão Arterial, induzidas por Atividade Física de Baixa Intensidade em Ratos com Hipertensão Renovascular
10 Low intensity physical activity has been used as a non-pharmacological treatment for hypertension. The caudal vetrolateral medulla (CVLM) represents the major tonic inhibitory afferece to the rostral ventrolateral medulla (RVLM). Regarding hypertensive states, CVLM neurons seem to be inefficient in counteracting the increased intrinsic pressor activity of
Publicado em: 2007
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30. Papel dos pressorreceptores nas alterações cardiorrespiratórias induzidas pelo infarto do miocárdio / Low Frequency Power of Heart Rate Variability Associated With Baroreflex Impairment in MyocardialInfarction in Rats
Changes in baroreflex sensitivity have been implicated in reduction of heart rate variability and increase of death risk after myocardial infarction The objectives of this study was to investigate if the impairment of baroreflex control of circulation induced by MI in sinoaortic denervated (SAD) rats is associated with changes in LF component of HRV and if t
Publicado em: 2006
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31. "Estudo comparativo entre o tratamento farmacológico, o treinamento físico moderado e o treinamento postural passivo em pacientes portadores de síncope neurocardiogênica" / Comparative study among pharmacological treatment, mild exercise training and tilt training in neurocardiogenic syncope patients
Neurocardiogenic syncope is an autonomic disfunction that leads to hypotension and loss of conciousness. Seventy patients were randomized in 4 groups: control, physical training, tilt training and pharmacological treatment. Clinical outcome, anxiety levels and baroreflex sensitivity for heart rate and muscle sympathetic nervous activity were evaluated. Lower
Publicado em: 2006
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32. AVALIAÇÃO DA SENSIBILIDADE DO BARORREFLEXO EM MODELO EXPERIMENTAL DE HIPERCOLESTEROLEMIA CO-EXISTENTE COM HIPERTENSÃO RENAL
Hypercholesterolemia (HC) and arterial hypertension (AH) are both major risk factors for the development and progression of atherosclerotic heart disease, and their co-existence has been associated with an increased incidence of cardiac events in clinical studies. The baroreflex sensitivity is a very important index in the prognosis of various cardiovascular
Publicado em: 2006
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33. Disfunção Autonômica Cardíaca na Resposta Cronotrópica Barorreflexa em ratos submetidos à Desnutrição Protéica
Previous publications from our Laboratory showed that rats submitted to protein malnutrition have alterations in the sensitivity of the baroreceptor reflex. The baroreflex modulates sympathetic and parasympathetic activity in order to mantain the blood pressure homeostasis. In this work, we evaluate the sympathetic and parasympathetic components of the neuro
Publicado em: 2006
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34. Effects of exercise training in hemodynamic profile of diabetics ovariectomized rats. / Efeito do Treinamento Físico no Perfil Hemodinâmico de Ratas Diabéticas Ooforectomizadas.
Diabetes and menopause markedly increase the risk of cardiovascular disease among women. The objective of the present study was to investigate the effects of exercise training on cardiovascular autonomic dysfunction and in the incidence of mortality in diabetic female rats submitted to ovarian hormones deprivation. Female Wistar rats were divided in ovariect
Publicado em: 2006
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35. A semi-automatic computerized method to measure baroreflex-mediated heart rate responses that reduces interobserver variability
Arterial baroreflex sensitivity estimated by pharmacological impulse stimuli depends on intrinsic signal variability and usually a subjective choice of blood pressure (BP) and heart rate (HR) values. We propose a semi-automatic method to estimate cardiovascular reflex sensitivity to bolus infusions of phenylephrine and nitroprusside. Beat-to-beat BP and HR t
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-06
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36. Effect of aging on carotid artery stiffness and baroreflex sensitivity during head-out water immersion in man
To examine the possible age-related blood pressure (BP) deregulation in response to central hypervolemia, we measured spontaneous baroreflex sensitivity (SBRS), carotid arterial compliance (CC), and R-R interval coefficient of variation (RRICV) during basal and thermoneutral resting head-out-of-water immersion (HOWI) in 7 young (YG = 24.0 ± 0.8 years) and 6
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-04