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A randomized study on coffee and blood pressure.

A A Bak¹, D E Grobbee

¹Department of Epidemiology and Biostatistics, Erasmus University, Rotterdam, The Netherlands.

Journal of Human Hypertension

|June 1, 1990

Summary

Quitting coffee for several weeks may slightly lower blood pressure in young adults. This study compared filtered coffee, boiled coffee, and no coffee, finding a small reduction in systolic blood pressure with abstinence.

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Area of Science:

Cardiovascular Health
Nutritional Science
Human Physiology

Background:

Coffee consumption is widespread, with various brewing methods potentially influencing its physiological effects.
Understanding the impact of coffee on blood pressure and heart rate is crucial for public health.
Normotensive adults represent a key demographic for studying the subtle effects of dietary factors.

Purpose of the Study:

To investigate the effects of coffee consumption and abstinence on blood pressure and heart rate.
To examine the mediating role of brewing methods (filtered vs. boiled coffee) in these effects.
To assess changes in systolic blood pressure (SBP) and diastolic blood pressure (DBP) in young adults.

Main Methods:

A randomized controlled trial involving 107 young, normotensive adults.
Participants were assigned to consume filtered coffee, boiled coffee, or no coffee for nine weeks.
Blood pressure and heart rate were monitored, with the filtered coffee group serving as the reference.

Main Results:

Coffee abstinence led to a statistically significant decrease in systolic blood pressure (-6.1 mmHg) compared to the filtered coffee group.
After adjustments, the systolic blood pressure reduction in the abstinence group was -3.4 mmHg.
No significant differences in blood pressure or heart rate were observed between the filtered and boiled coffee groups.

Conclusions:

Abstinence from coffee for several weeks may result in a modest reduction in blood pressure among young, normotensive individuals.
Brewing method (filtered vs. boiled) did not appear to significantly alter the effects on blood pressure or heart rate in this study.
Further research could explore long-term effects and mechanisms underlying coffee's impact on cardiovascular parameters.

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