[PHNUTR-L] Green Tea and Black Tea are Equally Effective in Improving Endothelial Function

[Kathrynne Holden]

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	Green Tea and Black Tea are Equally Effective in Improving Endothelial 
Function
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Reference: 	"The efficacy of black tea in ameliorating endothelial 
function is equivalent to that of green tea," Jochmann N, Stangl V, et 
al, Br J Nutr, 2007 Oct 5; [Epub ahead of print]. (Address: Medizinische 
Klinik mit Schwerpunkt Kardiologie und Angiologie, Charité - 
Universitätsmedizin Berlin, Campus Mitte, Schumannstrasse 20-21, D-10117 
Berlin, Germany. E-mail: verena.stangl at charite.de ).

Summary: 	In a study involving in vitro and in vivo components, results 
indicate that green and black tea are equally effective in improving 
endothelial function. In the in vitro study, endothelial function in 
response to green and black teas was first assessed in bovine aortic 
endothelial cells and rat aortic rings. Green and black tea were found 
to significantly increase endothelial NO synthase activity to the same 
extent in bovine aortic endothelial cells, and induce comparable 
endothelial-dependent vasodilation in rat aortic rings. In the in vivo 
part of the study, endothelial-dependent vasodilation (flow-mediated 
dilation, FMD) and endothelial-independent vasodilation (nitro-mediated 
dilation, NMD) were assessed by ultrasound in 21 healthy women before 
and two hours after consumption of green and black tea, in comparison to 
control (water) in a crossover design. Intake of green and black tea led 
to significant increases in FMD, where the increase in FMD associated 
with green and black tea intakes did not significantly differ. NMD did 
not vary between any of the groups. Thus, the results of this study 
suggest that consumption of green and black teas are equally effective 
in improving endothelial function.
-- 
Kathrynne Holden, MS, RD < fivestar at nutritionucanlivewith.com >
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