Endothelial Dysfunction Clinical Trial
Official title:
Comparison of Pure Epicatechin and Cocoa on Markers of Vascular Function
Intervention studies support a protective effect of flavonoid-rich foods such as chocolate
and tea on cardiovascular disease risk. In a previous study we found that pure epicatechin
improves markers of vascular function and insulin resistance although the results were less
pronounced than the majority of chocolate intervention studies.
The food matrix of chocolate or other compounds present in chocolate could play a role in
the bioavailability of flavonoids, resulting in these heightened improvements in vascular
function.
In this study we aim to compare the acute effects of pure epicatechin and high-flavonoid
chocolate on markers of vascular function.
Twenty male participants between the ages of 40 and 80 will visit the university on three
days, separated by a 2-week washout. During each visit the participants will, in random
order, be allocated to one of the three interventions:
1. High flavan-3-ol chocolate (70g) plus placebo capsule;
2. White chocolate (70g) plus 100mg of epicatechin in capsule form;
3. White chocolate (70g) plus placebo capsule; Measurements of vascular function will be
taken before, and 2 hours after consumption of the supplements. In order to determine
flavonoid bioavailability, 24-hour urine samples will be collected and 7 blood samples
will be taken over a period of 8 hours.
The primary study parameter is the percentage change in Flow-Mediated Dilation (FMD) as a
result of a high-flavonoid cocoa or epicatechin challenge. Additional study parameters
include plasma flavonoid and nitric oxide concentrations as well as pulse wave analysis
parameters.
;
Allocation: Randomized, Endpoint Classification: Bio-availability Study, Intervention Model: Crossover Assignment, Masking: Single Blind (Investigator), Primary Purpose: Basic Science
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