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In Brief During exercise, coronary blood flow increases to match the augmented myocardial oxygen demand because of tachycardia. Coronary vasodilation during exercise is via a combination of feedforward and feedback control mechanisms. Feedforward control is mediated by sympathetic β-adrenoceptor vasodilation. Feedback vasodilator control is via a novel hypothesis where adenine nucleotides released from red blood cells act on endothelial purinergic receptors. A combination of adrenergic feedforward and adenine nucleotide feedback control mechanisms increases coronary blood flow during exercise.
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Gorman et al. (2011) studied this question.
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