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Effect of dietary nitrate supplementation on exercise capacity and endothelial function. a) 6-min walk distance (6MWD) in placebo beetroot juice (Pl-BRJ; n=20) and nitrate-rich beetroot juice (NR-BRJ; n=24) COPD individuals. b, c) Endothelial function assessed, in Pl-BR (n=19) compared with NR-BRJ (n=21), as b) reactive hyperaemia index (RHI) and c) augmentation index normalised to a heart rate of 75 beats·min−1 (AIx75). Data are presented as mean±sd.
