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The purpose of this study was to determine the effect of exercise training on vasomotor properties of isolated peripheral collateral arteries. We hypothesized that daily treadmill exercise would improve the poor vasodilatory capacity of collateral arteries isolated from rats exposed to surgical occlusion of the femoral artery. Following femoral artery ligation, animals were either kept sedentary or exercise trained daily for a period of 3 weeks. Hindlimb collateral arteries were then isolated, cannulated and pressurized http://www.selleckchem.com/products/DAPT-GSI-IX.html via hydrostatic reservoirs to an intravascular pressure of either 45 or 120 cmH2O. Non-occluded contralateral vessels of the sedentary animals served as normal Control. Vasodilatory responses to acetylcholine (ACh; 1 �� 10?9�C1 �� 10?5?m) and sodium nitroprusside (SNP; 1 �� 10?9�C1 �� 10?4?m), constrictor responses to phenylephrine (PE; 1 �� 10?9�C1 �� 10?4?m), and flow-induced vasodilatation were determined. Endothelium-mediated vasodilatation responses were significantly greater to either ACh (P http://www.selleckchem.com/products/Gefitinib.html http://en.wikipedia.org/wiki/NK_cells collateral vessel function and enhance exercise tolerance during routine physical activity. Abbreviations? ACh acetylcholine COX cyclooxygenase EDHF endothelium-derived hyperpolarizing factor NOS nitric oxide synthase PE phenylephrine PAI peripheral arterial insufficiency SNP sodium nitroprusside Peripheral arterial insufficiency (PAI), resulting in a reduced blood flow capacity to the lower limbs and its resultant symptom of intermittent claudication, is a common vascular malady that is associated with increased morbidity and mortality (Sieminski & Gardner, 1997; Breek et al. 2001; Stewart et al. 2002; Aquarius et al. 2005). Enhanced physical activity has been shown to be an effective means of managing patients with PAI. For example, exercise therapy for patients with intermittent claudication increases pain-free walking time, maximal walking time and overall physical capacity (Gardner & Poehlman, 1995; Leng et al. 2000; Stewart et al. 2002).