Impact of Red Beetroot Juice on Vascular Endothelial Function and Cardiometabolic Responses to a High-Fat Meal in Middle-Aged/Older Adults with Overweight and Obesity: A Randomized, Double-Blind, Placebo-Controlled, Crossover Trial.

Autor:	Litwin NS; Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, USA., Van Ark HJ; Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, USA., Hartley SC; Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, USA., Michell KA; Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, USA., Vazquez AR; Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, USA., Fischer EK; Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, USA., Melby CL; Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, USA., Weir TL; Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, USA., Wei Y; Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, USA., Rao S; Department of Clinical Sciences, Colorado State University, Fort Collins, CO, USA., Hildreth KL; Division of Geriatric Medicine, School of Medicine, University of Colorado Anschutz Medical Campus, Denver, CO, USA., Seals DR; Department of Integrative Physiology, University of Colorado-Boulder, Boulder, CO, USA., Pagliassotti MJ; Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, USA., Johnson SA; Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, USA.
Jazyk:	angličtina
Zdroj:	Current developments in nutrition [Curr Dev Nutr] 2019 Oct 17; Vol. 3 (11), pp. nzz113. Date of Electronic Publication: 2019 Oct 17 (Print Publication: 2019).
DOI:	10.1093/cdn/nzz113
Abstrakt:	Background: High-fat meal (HFM) consumption may induce transient postprandial atherogenic responses, including impairment of vascular endothelial function, in individuals with overweight/obesity. Red beetroot juice (RBJ) may modulate endothelial function and other measures of cardiometabolic health. Objective: This study investigated the impact of acute and chronic RBJ consumption, including nitrate-dependent and -independent effects, on postprandial endothelial function and other cardiometabolic responses to a HFM. Methods: Fifteen men and postmenopausal women with overweight/obesity were enrolled in this randomized, double-blind, placebo-controlled, 4-period, crossover clinical trial. Following an overnight fast, participants underwent baseline assessment of endothelial function (reactive hyperemia index; RHI) and hemodynamics, and biological sample collection. In random order, participants consumed 70 mL (acute visit) of: 1 ) RBJ, 2 ) nitrate-free RBJ (NF-RBJ), 3 ) placebo + nitrate (PBO + NIT), or 4 ) placebo (PBO), followed by a HFM. RHI was remeasured 4 h post-HFM, and hemodynamic assessment and biological sample collection were performed 1, 2, and 4 h post-HFM consumption. Participants consumed treatments daily for 4 wk (chronic visit), and assessments were repeated before/after the HFM (without consuming treatments). Results: HFM consumption did not induce significant impairment of postprandial RHI. No significant differences in RHI were detected across treatment groups following acute or chronic exposure, despite increases in circulating nitrate/nitrite (NOx) concentrations in the RBJ and PBO + NIT groups compared with PBO and NF-RBJ ( P  < 0.0001 for all time points at the acute visit; P  < 0.05 for all time points at the chronic visit). Although the HFM led to significant alterations in several secondary outcomes, there were no consistent treatment effects on postprandial cardiometabolic responses. Conclusions: HFM consumption did not impair postprandial endothelial function in this population, and RBJ exposure did not alter postprandial endothelial function or other outcomes despite increasing NOx concentrations. This trial is registered at clinicaltrials.gov as NCT02949115. (Copyright © The Author(s) 2019.)
Databáze:	MEDLINE
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