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The concentration of nitrite in plasma (panel a) and muscle (panel B) following a 12‐week exercise training program in combination with either placebo (white bars) or beetroot juice (Black bars). **difference from pre‐supplement (PAD) (p < 0.01). ##difference between groups (ex+PL vs. ex+BR) after supplementation (PAD) (p < 0.01). Group means ± SEM.
