The acute effects of dietary nitrate supplementation opostmenopausal endothelial resistance to ischemia reperfusion injury: a randomized, placebo-controlled, double blind, crossover clinical trial

Jocelyn M. Delgado Spicuzza, Jigar Gosalia, Matthew Studinski, Chenée Armando, Elmira Alipour, Daniel B. Kim-Shapiro, Michael Flanagan, Yasina B. Somani, Davidn Proctor

Research output: Contribution to journalArticlepeer-review

Abstract

Postmenopausal cardiovascular health is a critical determinant of longevity. Consumption of beetroot juice (BR) and other nitrate-rich foods is a safe, effective non-pharmaceutical intervention to increase systemic bioavailability of the vasoprotective molecule, nitric oxide, through the exogenous nitrate (NO3)–nitrite (NO2)–nitric oxide (NO) pathway. We hypothesized that a single dose of nitrate-rich beetroot juice (BRnitrate 600 mg NO3 /140 mL, BRplacebo ∼ 0 mg/140 mL) would improve resting endothelial function and resistance to ischemia–reperfusion (IR) injury to a greater extent in early-postmenopausal (1–6 years following their final menstrual period (FMP), n = 12) compared to late-postmenopausal (6+ years after FMP, n = 12) women. Analyses with general linear models revealed a significant (p < 0.05) timetreatment interaction effect for brachial artery adjusted flow-mediated dilation (FMD). Pairwise comparisons revealed that adjusted FMD was significantly lower following IR-injury in comparison to all other time points with BRplacebo (early FMD 2.51 ± 1.18%, late FMD 1.30 ± 1.10, p < 0.001) and was lower than post-IR with BRnitrate (early FMD 3.84 ± 1.21%, late FMD 3.21 ± 1.13%, p = 0.014). A single dose of BRnitrate significantly increased resting macrovascular function in the late postmenopausal group only (p = 0.005). Considering the postmenopausal stage-dependent variations in endothelial responsiveness to dietary nitrate, we predict differing mechanisms underpin macrovascular protection against IR injury.

Original languageEnglish (US)
Pages (from-to)634-647
Number of pages14
JournalCanadian Journal of Physiology and Pharmacology
Volume102
Issue number11
DOIs
StatePublished - Nov 1 2024

All Science Journal Classification (ASJC) codes

  • Physiology
  • Pharmacology
  • Physiology (medical)

Fingerprint

Dive into the research topics of 'The acute effects of dietary nitrate supplementation opostmenopausal endothelial resistance to ischemia reperfusion injury: a randomized, placebo-controlled, double blind, crossover clinical trial'. Together they form a unique fingerprint.

Cite this