Caffeine Blood Pressure Research
Most cellular, animal, and human studies of green tea and cardiovascular risk factors like high blood pressure, high cholesterol, and strokes have used either green tea or black tea. Now a new study compares a standardized decaffeinated green tea extract capsule with placebo. Researchers in Florida examined 111 healthy adults, age 21-70, over 3 months for blood pressure, blood cholesterol, serum oxidative stress, and inflammatory markers. The volunteers took two decaf green tea extract capsules twice a day or placebo twice a day in the double-blind study. Within the first 3 weeks, the green tea participants showed lower blood pressure in both systolic and diastolic measurements. After three months By three months, this caffeine blood pressure study showed that systolic blood pressure remained significantly lower for the green tea group. Also total cholesterol was lower, oxidative stress was lower, and the inflammatory blood marker was lower for the green tea group after 3 months. Most studies show that caffeine enhances green tea benefits. But this study supports potential cardiovascular risk reduction even with decaf green tea for those who might be sensitive to caffeine (Nantz MP, Standardized capsule of Camellia sinensis lowers cardiovascular risk factors in a randomized, double-blind, placebo-controlled study, Nutrition, October 2008). That's great news for people who choose decaf green tea.
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