Impact of cocoa flavanol consumption on blood pressure responsiveness to exercise

Berry, Narelle M, Davison, Kade, Coates, Alison M, Buckley, Jonathan D and Howe, Peter R C (2010) Impact of cocoa flavanol consumption on blood pressure responsiveness to exercise. British Journal of Nutrition, 103 (10). pp. 1480-1484. ISSN 0007-1145

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Abstract

Impaired endothelial vasodilatation may contribute to the exaggerated blood pressure (BP) responses to exercise in individuals who are overweight/obese. The present study investigated whether consumption of cocoa flavanols, which improve endothelium-dependent flow-mediated dilatation (FMD), can modify BP responsiveness to exercise. Twenty-one volunteers (eight females and thirteen males, 54.9 (se 2.2) years, BMI 31.6 (se 0.8) kg/m2, systolic BP 134 (se 2) mmHg, diastolic BP (DBP) 87 (se 2) mmHg) were randomised to consume single servings of either a high-flavanol (HF, 701 mg) or a low-flavanol (LF, 22 mg) cocoa beverage in a double-blind, cross-over design with 3-7-d washout between treatments. Two hours after cocoa consumption, FMD was measured, followed by continuous beat-to-beat assessment (Finapres) of BP before and during 10 min of cycling at 75 % of age-predicted maximum heart rate. Averaged data from two assessments on each type of beverage were compared by analysis of covariance using pre-exercise BP as the covariate. Pre-exercise BP was similar after taking LF and HF (153 (se 3)/88 (se 3) v. 153 (se 4)/87 (se 2) mmHg, respectively, P>0.05). However, the BP response to exercise (area under BP curve) was attenuated by HF compared with LF. BP increases were 68 % lower for DBP (P = 0.03) and 14 % lower for mean BP (P = 0.05). FMD measurements were higher after taking HF than after taking LF (6.1 (se 0.6) % v. 3.4 (se 0.5) %, P < 0.001). By facilitating vasodilation and attenuating exercise-induced increases in BP, cocoa flavanols may decrease cardiovascular risk and enhance the cardiovascular benefits of moderate intensity exercise in at-risk individuals.

Item Type: Article
Uncontrolled Keywords: beverages,blood pressure,cacao,double-blind method,exercise,female,flavonols,humans,male,middle aged,overweight
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
Depositing User: Pure Connector
Date Deposited: 24 Sep 2016 00:53
Last Modified: 24 Jul 2019 22:46
URI: https://ueaeprints.uea.ac.uk/id/eprint/60253
DOI: 10.1017/S0007114509993382

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