Fig. 1.

Effect of dietary inorganic nitrate (nitrate) supplementation on resting blood pressure and plasma nitrate, nitrite, and l-arginine concentrations in study 1. Plasma nitrate (A), nitrite (B), and l-arginine (C) concentrations and systolic blood pressure (SBP; D), diastolic blood pressure (DBP; E), and mean arterial pressure (MAP; F) for both placebo and nitrate conditions were measured in patients with hypertension taking antihypertensive medications. Individual (circles) and mean (bar) data are reported; n = 13 for all variables. †Different from placebo (P < 0.05).