Many studies have found an association between tea consumption and a reduced risk of cardiovascular disease. Green tea is associated with more beneficial effects than black tea, likely due to the actions of its catechin polyphenols. The cells that line blood vessels are endothelial cells, and coronary endothelial function is essential for the function of the cardiovascular system. Endothelial dysfunction is a major event in the progression of atherosclerosis, where plaque builds up in blood vessels.
A recent randomized, sham procedure-controlled, crossover study observed the effects of green tea and caffeine on flow-mediated dilatation (FMD) of the brachial artery, which is related to coronary endothelial function and is an independent predictor of cardiovascular risk. 14 healthy participants around 30 years of age were given green tea, caffeine or hot water. Their FMD measures were taken before the intervention and at specific time points afterwards. The study found that while caffeine and water had no significant effects, green tea consumption significantly increased flow-mediated dilatation of the brachial artery.
The results of this study suggest that green tea has beneficial effects on endothelial function. This is likely mediated by its major catechin, epigallocatechin gallate (EGCG) which has been found in a previous study to improve endothelial function. The results of this study may help to explain the beneficial effects of green tea on cardiovascular health.
Alexopoulos N et al. The acute effect of green tea consumption of endothelial function in healthy individuals. European Journal of Cardiovascular Prevention and Rehabilitation. 2008;15:300-305.
For more information see EGCG Max
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