Behavioral and neurochemical indexes of nigrostriatal dopaminergic function were compared between sedentary control rats (n = 12) and daily spontaneous running (DSR) male rats (n = 10). Nine weeks of DSR did not significantly alter body, heart,…
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…
Factors associated with a single bout of dynamic exercise (increased circulating catecholamines, increased body temperature, and decreased pH) are known to attenuate the vascular response to alpha-adrenergic receptor activation. Therefore, we…
Animal experimentation is limited in many curricula due to the expense, lack of adequate animal facilities and equipment, and limited experience of the teachers. There are also ethical concerns dealing with the comfort and safety of the animals. To…
The influence of the release of endothelium-derived nitric oxide (NO) on the vasoconstrictor response to phenylephrine (PE) was evaluated before and after a single bout of dynamic exercise. Each rat ran on a motor-driven treadmill at
Examining the hemodynamic responses to exercise provides a unique opportunity to analyze and integrate cardiovascular physiology because more is learned about how a system operates when it is forced to perform than when it is idle. We designed a…
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…
Exercise training alters the cardiopulmonary baroreflex regulation of the circulation; however, the mechanisms responsible are unknown. One possibility is an enhanced afferent response to cardiopulmonary stimulation. We therefore tested the…
The effect of daily spontaneous running on blood pressure homeostasis (BPH) was evaluated in 19 male and 13 female control rats and 7 male and 13 female daily spontaneous running rats subjected to surgery and subsequent repetitive hemodynamic…
Whether two copies of the neurotrophin-3 (NT3) gene are necessary for proper development of cardiac sympathetic innervation was investigated in mice carrying a targeted inactivation of the NT3 gene. Heterozygous (+/-) and null (-/-) mutant mice had…
