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“Conclusions: Although 3 d of BRJ supplementation increased plasma nitrite concentration and lowered blood pressure, it did not improve 100-m and 200-m swimming TT performance.”
“ Plasma nitrite and nitrate concentrations were significantly increased after the ingestion of BR and NIT with the highest concentrations in the 12-mmol trials.”
Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme • 2016 | View Paper
“Relative to placebo, beetroot juice resulted in a significant increase in plasma nitrate (placebo, 57±66 vs beetroot, 319±110µM; P < 0.001) and plasma nitrite concentration (placebo, 680±256 vs beetroot, 1065±607nM; P < 0.001).”
“ Plasma nitrite concentration (baseline: 454 ± 81 nM) was significantly elevated (+39% at 2.5 h postingestion; +25% at 5 days; +46% at 15 … < 0.05) and systolic and diastolic BP (baseline: 127 ± 6 and 72 ± 5 mmHg, respectively) were reduced by ∼4% throughout the BR supplementation period (… < 0.05).”
American journal of physiology. Regulatory, integrative and comparative physiology • 2010 | View Paper
“Using a randomized crossover study design, we show that nitrate supplementation (KNO3 capsules: 4 versus 12 … of nitrate) versus 24 mmol of KCl [n=20]) or vegetable intake (250 mL of beetroot juice [5.5 mmol nitrate] …-dependent elevation in plasma nitrite concentration and elevation of … in healthy volunteers.”