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• W2000472092 abstract "1. Static exercise elicits increases in arterial blood pressure and heart rate (HR) in humans and conscious animals. In this study, the effects of intracerebroventricular (I.C.V.) administration of clonidine, an alpha 2-adrenergic agonist, on these cardiovascular responses were investigated using conscious cats. Four cats were operantly trained to extend a forelimb and press a bar (200-650 g) for 15-60 s. A stainless-steel cannula was inserted into the right lateral ventricle for I.C.V. injection of drugs, and a common carotid artery was catheterized to measure mean arterial pressure (MAP) and HR. The number of exercise trials and changes in MAP, HR and force were pooled for 30 min periods. After the cats exercised for 30 min, either artificial cerebrospinal fluid (CSF) or clonidine (2 or 5 micrograms) were administered intracerebroventricularly. 2. Before clonidine injection, fifty-two exercise trials increased MAP and HR by 15 +/- 3 mmHg and 41 +/- 5 beats min-1, respectively. Administration of clonidine (2 micrograms) did not alter the resting MAP and HR, but attenuated the increases in MAP and HR in response to exercise (0-30 min post-clonidine: n = 81; delta MAP, 6 +/- 3 mmHg; delta HR, 20 +/- 6 beats min-1; 30-60 min post-clonidine: n = 71; delta MAP, 4 +/- 4 mmHg; delta HR, 17 +/- 8 beats min-1). Administration of artificial CSF I.C.V. had no effect on the cardiovascular responses to static exercise. 3. An increased dose of clonidine (5 micrograms) decreased resting MAP and HR by 31 +/- 7 mmHg and 37 +/- 7 beats min-1, respectively, and markedly blunted the cardiovascular responses to exercise (pre-clonidine: n = 52; delta MAP, 17 +/- 3 mmHg; delta HR, 38 +/- 5 beats min-1; post-clonidine 0-30 min: n = 66; delta MAP, 4 +/- 2 mmHg; delta HR, 15 +/- 5 beats min-1; post-clonidine 30-60 min: n = 60; delta MAP, 4 +/- 2 mmHg; delta HR, 14 +/- 6 beats min-1). Pretreatment with the alpha 2-adrenergic antagonist, yohimbine (8 micrograms, I.C.V.), blocked the attenuating effects of I.C.V. administration of clonidine (5 micrograms). 4. These results show that stimulation of central alpha 2-adrenoceptors by clonidine attenuates the cardiovascular responses to static exercise in conscious cats. In addition, this study suggests that alpha 2-adrenoceptors blocked by yohimbine injected I.C.V. do not appear to have a tonic influence on HR and blood pressure." @default.
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• W2000472092 title "Cardiovascular responses to static exercise in conscious cats: effects of intracerebroventricular injection of clonidine." @default.
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• W2000472092 doi "https://doi.org/10.1113/jphysiol.1996.sp021236" @default.
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