G Renda et al, 2011. Genetic determinants of blood pressure responses to caffeine drinking, American Journal of Clinical Nutrition, published online ahead of print.

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Background: The widely observed between-subject variability in cardiovascular responses to coffee may have a genetic basis.
Objective: We evaluated acute blood pressure (BP) responses to caffeine and explored whether they are influenced by candidate gene variants affecting caffeine metabolism (for cytochrome P450 1A2), adenosine metabolism (for adenosine receptor and AMP deaminase), or catecholamine receptors.
Methods: We recruited 110 healthy male habitual moderate coffee drinkers who refrained from drinking coffee on the day preceding the study. Each subject underwent ambulatory BP monitoring at 6-min intervals for 2 h. Each participant was administered, in a double-blind design, 40 mL of either a decaffeinated coffee preparation plus 3 mg caffeine/kg (caf) or the corresponding vehicle (decaf). The protocol was repeated 24 h later with the alternative preparation. Blood samples were collected for genetic and plasma caffeine and catecholamine evaluations.
Results: Compared with decaf, caf was associated with a mean (6 SD) significant increase in systolic BP of 4 + 12 mm Hg and in diastolic BP of 3 + 10 mm Hg (P Conclusions: Variability in the acute BP response to coffee may be partly explained by genetic polymorphisms of the adenosine A2A receptors and α2-adrenergic receptors.

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