title: Acute resveratrol supplementation improves flow-mediated dilatation in overweight/obese individuals with mildly elevated blood pressure.
abstract: OBJECTIVE
  Flow-mediated dilatation of the brachial artery (FMD) is a biomarker of endothelial function and cardiovascular health. Impaired FMD is associated with several cardiovascular risk factors including hypertension and obesity. Various food ingredients such as polyphenols have been shown to improve FMD. We investigated whether consuming resveratrol, a polyphenol found in red wine, can enhance FMD acutely and whether there is a dose-response relationship for this effect.
  
  
  RESULTS
  19 overweight/obese (BMI 25-35 kg m(-2)) men or post-menopausal women with untreated borderline hypertension (systolic BP: 130-160 mmHg or diastolic BP: 85-100 mmHg) consumed three doses of resveratrol (resVida™ 30, 90 and 270 mg) and a placebo at weekly intervals in a double-blind, randomized crossover comparison. One hour after consumption of the supplement, plasma resveratrol and FMD were measured. Data were analyzed by linear regression versus log(10) dose of resveratrol. 14 men and 5 women (age 55 ± 2 years, BMI 28.7 ± 0.5 kg m(-2), BP 141 ± 2/89 ± 1 mmHg) completed this study. There was a significant dose effect of resveratrol on plasma resveratrol concentration (P < 0.001) and on FMD (P < 0.01), which increased from 4.1 ± 0.8% (placebo) to 7.7 ± 1.5% after 270 mg resveratrol. FMD was also linearly related to log(10) plasma resveratrol concentration (P < 0.01).
  
  
  CONCLUSIONS
  Acute resveratrol consumption increased plasma resveratrol concentrations and FMD in a dose-related manner. This effect may contribute to the purported cardiovascular health benefits of grapes and red wine.
authors.affiliation: Nutritional Physiology Research Centre, University of South Australia, GPO Box 2471, Adelaide, South Australia 5001, Australia. Rachel.wong@postgrads.unisa.edu.au
authors.forename: R H X
authors.initials: RH
authors.lastname: Wong
authors.forename: P R C
authors.initials: PR
authors.lastname: Howe
authors.forename: J D
authors.initials: JD
authors.lastname: Buckley
authors.forename: A M
authors.initials: AM
authors.lastname: Coates
authors.forename: I
authors.initials: I
authors.lastname: Kunz
authors.forename: N M
authors.initials: NM
authors.lastname: Berry
mesh_terms: D001916:Brachial Artery; D002318:Cardiovascular Diseases / Q000517:prevention & control; D018592:Cross-Over Studies; D019587:Dietary Supplements; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D004730:Endothelium, Vascular / Q000503:physiopathology; D005260:Female; D006801:Humans; D006973:Hypertension / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000503:physiopathology*; D050177:Overweight / Q000503:physiopathology*; D010919:Placebos; D000077185:Resveratrol; D012307:Risk Factors; D013267:Stilbenes / Q000008:administration & dosage* / Q000097:blood; D014664:Vasodilation / Q000187:drug effects*
chemical_list: D010919:Placebos; D013267:Stilbenes; D000077185:Resveratrol