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Testosterone causes direct relaxation of rat thoracic aorta.

Several recent studies have provided evidence that gonadal steroid hormones can exert acute (nongenomic) effects on both neural and vascular tissues. This study examines the acute effects of testosterone (T) on vascular reactivity of the rat thoracic…

Acute exercise attenuates cardiac autonomic regulation in hypertensive rats.

Dynamic exercise may be used as a safe, therapeutic approach to reduce sympathetic nerve activity at rest and thus may be beneficial for individuals with hypertension. Therefore, we tested the hypothesis that a single bout of mild to moderate dynamic…

Reduced vascular responsiveness after a single bout of dynamic exercise in the conscious rabbit.

We measured agonist-induced changes in the iliac artery blood flow velocity (IFV) independent of baroreflex-mediated compensatory mechanisms in chronically instrumented New Zealand White rabbits (n = 8). Animals were instrumented with a Doppler flow…

Daily exercise attenuates the sympathetic component of the arterial baroreflex control of heart rate.

The influence of daily spontaneous running (DSR) on the sympathetic (SC) and parasympathetic components of the arterial baroreflex control of heart rate (HR) was examined in 16 female Long Evans rats [8 sedentary (SED) and 8 DSR]. After

Daily exercise and gender influence postexercise cardiac autonomic responses in hypertensive rats.

The influence of daily spontaneous running (DSR) and gender on postexercise cardiac autonomic responses was examined in spontaneously hypertensive rats. Rats were weaned at 4-5 wk of age and were randomly assigned to a sedentary (7 males and 6…

Gender difference in cardiopulmonary reflex inhibition of sympathetic nerve activity.

We tested the hypothesis that reflex responses to mechanical [increase in left atrial pressure (LAP) 0-25 mmHg] and chemical stimulation [left atrial injection of phenylbiguanide (PBG), 0.5-10 mg/kg] of cardiopulmonary receptors are greater in female…

Role of endothelium in sexual dimorphism in vasopressin-induced contraction of rat aorta.

In rat thoracic aorta, contractile responses to arginine vasopressin (AVP) are twofold higher in females than in males. To determine the role of the endothelium in this phenomenon, the effects of endothelium removal and inhibition of nitric oxide…

Sexual dimorphism in vasopressin-induced contraction of rat aorta.

Previously, we reported that, in the rat, pressor responsiveness to vasopressin (VP) is higher in males than in females during most phases of the estrous cycle. To explore the role of the vasculature in this phenomenon, we examined vascular…

Tags: *Sex Characteristics, *Vasoconstriction, 1991, Animals, Aorta/*drug effects, Arginine Vasopressin/*pharmacology, Crofton J T, Dose-Response Relationship, Drug, Female, Male, Osmolar Concentration, Phenylephrine/pharmacology, Rats, Share L, Stallone J N, The American journal of physiology

Sexual dimorphism in prostanoid-potentiated vascular contraction: roles of endothelium and ovarian steroids.

The effects of constrictor prostanoid (CP) pathway inhibitors on vascular reactivity to vasopressin (VP) and phenylephrine (PE) were examined in thoracic aortas of male, female, and ovariectomized (OVX) female Sprague-Dawley rats. Maximal contractile…

Sex differences in nitric oxide-mediated attenuation of vascular reactivity to vasopressin are abolished by gonadectomy.

In the rat thoracic aorta, contractile responses to vasopressin are two-fold higher in females than in males, primarily because nitric oxide-mediated attenuation of contraction is greater in males than in females. To determine the role of the gonadal…

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