Cutaneous Vascular Conductance
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Penile microvascular endothelial function in hypertensive patients: effects of acute type 5 phosphodiesterase inhibition
The primary aim of this study was to evaluate penile endothelial microvascular function in patients with primary arterial hypertension and age-matched normotensive subjects using laser speckle contrast imaging (LSCI). Additionally, we analyzed the acute penile microvascular effects induced by oral phosphodiesterase type 5 inhibitor (sildenafil; SIL) administ
Braz J Med Biol Res. Publicado em: 11/01/2018
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2. Participação do óxido nítrico encefálico no controle cardiovascular de rã-touro, Lithobathes catesbeianus
O objetivo do presente trabalho foi determinar se o óxido nítrico (NO) atuando no SNC de rãs apresenta tônus inibitório sobre a pressão arterial média (PAM) e a frequência cardíaca (FC) reduzindo a atividade simpática dependente de receptores a e/ou b adrenérgicos durante o inverno e a primavera/verão. Desta forma, a temperatura corporal e a PAM
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/04/2012
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3. Baroreceptor modulation of cutaneous vasodilator and sudomotor responses to thermal stress in humans.
1. The influence of baroreceptor unloading on cutaneous vasodilatation was investigated in ten human subjects during dynamic supine cycle ergometer exercise at 28 degrees C. Increases in forearm skin blood flow (venous occlusion plethysmography) and arterial blood pressure (non-invasive) were measured and used to calculate forearm vascular conductance while
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4. Ketorolac alters blood flow during normothermia but not during hyperthermia in middle-aged human skin
In young healthy humans full expression of reflex cutaneous vasodilation is dependent on cyclooxygenase (COX)- and nitric oxide synthase (NOS)-dependent mechanisms. Chronic low-dose aspirin therapy attenuates reflex cutaneous vasodilation potentially through both platelet and vascular COX-dependent mechanisms. We hypothesized the contribution of COX-dependen
American Physiological Society.
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5. Neuropeptide Y and neurovascular control in skeletal muscle and skin
Neuropeptide Y (NPY) is a ubiquitous peptide with multiple effects on energy metabolism, reproduction, neurogenesis, and emotion. In addition, NPY is an important sympathetic neurotransmitter involved in neurovascular regulation. Although early studies suggested that the vasoactive effects of NPY were limited to periods of high stress, there is growing evide
American Physiological Society.
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6. Reflex vasoconstriction in aged human skin increasingly relies on Rho kinase-dependent mechanisms during whole body cooling
Primary human aging may be associated with augmented Rho kinase (ROCK)-mediated contraction of vascular smooth muscle and ROCK-mediated inhibition of nitric oxide synthase (NOS). We hypothesized that the contribution of ROCK to reflex vasoconstriction (VC) is greater in aged skin. Cutaneous VC was elicited by 1) whole body cooling [mean skin temperature (Tsk
American Physiological Society.
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7. Neural and non-neural control of skin blood flow during isometric handgrip exercise in the heat stressed human
During heat stress, isometric handgrip (IHG) exercise causes cutaneous vasoconstriction, but it remains controversial whether neural mechanisms are responsible for this observation. The objective of this study was to test the hypothesis that cutaneous vasoconstriction during IHG exercise in heat stressed individuals occurs via a neural mechanism. An axillary
Blackwell Science Inc.
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8. Fluctuations in blood flow to acral skin in humans: connection with heart rate and blood pressure variability.
1. Spontaneous fluctuations in blood flow in arteries supplying acral skin were investigated with Doppler ultrasound in human subjects. Finger blood pressure, heart rate (HR) and cardiac output were measured simultaneously and noninvasively. 2. Synchronous fluctuations in flow were found in arteries supplying the hands and feet. The fluctuations were larger
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9. Local tetrahydrobiopterin administration augments cutaneous vasoconstriction in aged humans
Reflex vasoconstriction (VC) is attenuated in aged skin resulting in greater skin blood flow and heat loss during cold exposure. We hypothesized that adrenergic function is compromised due to depletion of tetrahydrobiopterin (BH4), an essential cofactor required for catecholamine synthesis, and therefore local BH4 supplementation would functionally augment r
Blackwell Science Inc.
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10. Roles of nitric oxide synthase isoforms in cutaneous vasodilation induced by local warming of the skin and whole body heat stress in humans
Nitric oxide (NO) participates in the cutaneous vasodilation caused by increased local skin temperature (Tloc) and whole body heat stress in humans. In forearm skin, endothelial NO synthase (eNOS) participates in vasodilation due to elevated Tloc and neuronal NO synthase (nNOS) participates in vasodilation due to heat stress. To explore the relative roles an
American Physiological Society.
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11. Plasma catecholamines and hyperglycaemia influence thermoregulation in man during prolonged exercise in the heat.
1. We manipulated plasma catecholamines (combined adrenaline and noradrenaline concentrations) to three levels during prolonged exercise to determine their effect on cutaneous and forearm vascular conductance (CVC and FVC), oesophageal temperature (T(oes)) and cardiovascular responses. 2. On three occasions, seven endurance-trained men cycled at 65% VO2, max