Increased nitrate intake from beetroot juice over 4 weeks affects nitrate metabolism, but not vascular function or blood pressure in older adults with hypertension

Autor(en)

Rebeka Fejes, Martin Lutnik, Stefan Weisshaar, Nina Pilat, Karl-Heinz Wagner, Hans-Peter Stüger, Jonathan M Peake, Richard J Woodman, Kevin D Croft, Catherine P Bondonno, Jonathan M Hodgson, Michael Wolzt, Oliver Neubauer

Abstrakt

The decline in vascular function and increase in blood pressure with aging contribute to an increased cardiovascular disease risk. In this randomized placebo-controlled crossover study, we evaluated whether previously reported cardiovascular benefits of plant-derived inorganic nitrate

via nitric oxide (NO) translate into improved vascular function and blood pressure-lowering in 15 men and women (age range: 56-71 years) with treated hypertension. We investigated the effects of a single ∼400 mg-dose at 3 hours post-ingestion (3H POST) and the daily consumption of 2 × ∼400 mg of nitrate through nitrate-rich compared with nitrate-depleted (placebo) beetroot juice over 4 weeks (4WK POST). Measurements included nitrate and nitrite in plasma and saliva; endothelial-dependent and -independent forearm blood flow (FBF) responses to acetylcholine (FBF

ACh) and glyceryltrinitrate (FBF

GTN); and clinic-, home- and 24-hour ambulatory blood pressure. Compared to placebo, plasma and salivary nitrate and nitrite increased at 3H and 4WK POST following nitrate treatment (

P < 0.01), suggesting a functioning nitrate-nitrite-NO pathway in the participants of this study. There were no differences between treatments in FBF

ACh and FBF

GTN-area under the curve (AUC) ratios [AUC ratios after (3H POST, 4WK POST) compared with before (PRE) the intervention], or 24-hour ambulatory blood pressure or home blood pressure measures (

P > 0.05). These findings do not support the hypothesis that an increased intake of dietary nitrate exerts sustained beneficial effects on FBF or blood pressure in hypertensive older adults, providing important information on the efficacy of nitrate-based interventions for healthy vascular aging. This study was registered under ClinicialTrials.gov (NCT04584372).

Organisation(en)

Department für Ernährungswissenschaften

Externe Organisation(en)

Medizinische Universität Wien, AGES - Österreichische Agentur für Gesundheit und Ernährungssicherheit, Queensland University of Technology, Flinders University, University of Western Australia, Edith Cowan University, Universität für Weiterbildung Krems

Journal

Food & Function: linking the chemistry and physics of food with health and nutrition

ISSN

2042-6496

DOI

https://doi.org/10.1039/d3fo03749e

Publikationsdatum

03-2024

Peer-reviewed

ÖFOS 2012

303009 Ernährungswissenschaften

ASJC Scopus Sachgebiete

Food Science

Sustainable Development Goals

SDG 3 – Gesundheit und Wohlergehen

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/increased-nitrate-intake-from-beetroot-juice-over-4-weeks-affects-nitrate-metabolism-but-not-vascular-function-or-blood-pressure-in-older-adults-with-hypertension(75a5dd04-1efa-4469-93df-c965432572a9).html