Moderate doses of dietary nitrate elicit greater effects on blood pressure and endothelial function than a high dose: A 13-week pilot study.
Nutr Metab Cardiovasc Dis
; 33(6): 1263-1267, 2023 06.
Article
em En
| MEDLINE
| ID: mdl-36958967
BACKGROUND & AIMS: Few studies have explored the prolonged effects of dietary nitrate on vascular health. This pilot study tested the effects of prolonged consumption (13 weeks) of a range of doses of dietary nitrate (NO3-), provided as beetroot juice (BJ), on blood pressure (BP) and endothelial function in overweight and obese older participants. METHODS AND RESULTS: Sixty-two overweight or obese older participants (60-75 years) were randomized to the following interventions: (1) high NO3- (2) medium NO3-, (3) low NO3-, or (4) placebo. Resting clinic and home BP were measured pre- and post-intervention. Laser Doppler iontophoresis was used to quantify changes in endothelial-dependent and independent microvascular blood flow. RESULTS: This pilot study showed that medium and low doses of NO3- were more effective in lowering resting-clinic SBP (P = 0.04 and, P = 0.03, respectively) than was PL. The lower doses of NO3- also resulted in significant increases in microvascular perfusion (medium, P = 0.02; low, P = 0.002) relative to baseline values. CONCLUSION: These findings indicate that supplementation with medium and low, but not high, doses of NO3- for 13 weeks had positive effects on BP and endothelial function in older overweight and obese adults. These findings require confirmation in larger studies.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Sobrepeso
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Nitratos
Tipo de estudo:
Clinical_trials
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Diagnostic_studies
Limite:
Adult
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Aged
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Humans
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article