[PHNUTR-L] Green Tea and Black Tea are Equally Effective in
Improving Endothelial Function
fivestar at nutritionucanlivewith.com
Tue Oct 16 19:05:56 PDT 2007
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Green Tea and Black Tea are Equally Effective in Improving Endothelial
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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