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Les épinards, un bon booster de NO

28/11/2013 | Etudes Compléments alimentaires et Etudes Anti-âge

 

Effects of a nitrate-rich meal on arterial stiffness and blood pressure in healthy volunteers
Alex H. Liu Nitric Oxide Volume 35, 30 November 2013, Pages 123–130


Highlights

•We assessed the acute vascular effects of a nitrate-rich meal containing spinach.
•Primary outcome measures were arterial stiffness and blood pressure.
•Spinach consumption resulted in lower blood pressure and higher arterial compliance.
•If sustained, these effects could contribute to better cardiovascular health.

An increase in nitrate intake can augment circulating nitrite and nitric oxide. This may lead to lower blood pressure and improved vascular function. Green leafy vegetables, such as spinach, are rich sources of nitrate. We aimed to assess the acute effects of a nitrate-rich meal containing spinach on arterial stiffness and blood pressure in healthy men and women. Twenty-six participants aged 38–69 years were recruited to a randomized controlled cross-over trial. The acute effects of two energy-matched (2000 kJ) meals, administered in random order, were compared. The meals were either high nitrate (220 mg of nitrate derived from spinach [spinach]) or low nitrate [control]. Outcome measurements were performed pre-meal and at specific time points up to 210 min post meal. Spinach resulted in an eightfold increase in salivary nitrite and a sevenfold increase in salivary nitrate concentrations from pre-meal (P < 0.001) to 120 min post meal. Spinach compared with control resulted in higher large artery elasticity index (P < 0.001), and lower pulse pressure (P < 0.001) and systolic blood pressure (P < 0.001). Post meal carotid–femoral pulse wave velocity (P = 0.07), augmentation index (P = 0.63), small artery elasticity index (P = 0.98) and diastolic blood pressure (P = 0.13) were not significantly altered by spinach relative to control. Therefore, consumption of a nitrate-rich meal can lower systolic blood pressure and pulse pressure and increase large artery compliance acutely in healthy men and women. If sustained, these effects could contribute to better cardiovascular health.

 

 

 

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