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Green and Black Tea Polyphenols Reduce Blood Pressure in Rats
Study description: The effects of tea
polyphenols on blood pressure were tested in rats that were bred to develop high
blood pressure and strokes.
Type of study: Animal
Study Methods: 13 week-old rats were
divided into three groups and given black tea polyphenols, green tea
polyphenols, or plain water (the control group) for 4 weeks, along with a
standard diet. Their blood pressure was monitored throughout the study.
What happened: The average systolic and
diastolic blood pressure readings were lower in the black tea and green tea
groups -- some times significantly lower -- compared to the control group.
Researchers' conclusion: "Tea polyphenols
attenuated the development of hypertension in SHRSP [spontaneously hypertensive
rats]."
Citation: Negishi H, Xu JW, Ikeda K, et
al. Black and green tea polyphenols attenuate blood pressure increases in
stroke-prone spontaneously hypertensive rats. Journal of Nutrition
2004;134(1):38-42. (Click
here to read PubMed study abstract.)
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Nadine Taylor, M.S., R.D. presents
GreenTeaLibrary.com,
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describing the health benefits of green tea.
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