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Acute blood pressure elevations with caffeine in men with borderline systemic hypertension
G A Pincomb1, W R Lovallo, B S McKey
1Veterans Affairs Medical Center, Medical Research Service & the Behavioral Sciences Laboratories, Oklahoma City 73104, USA.
The American Journal of Cardiology
|February 1, 1996
Summary
Caffeine significantly increases diastolic blood pressure and vascular resistance in borderline hypertensive men, potentially worsening their condition. This exaggerated response was observed in nearly all borderline subjects studied.
Area of Science:
- Cardiovascular Physiology
- Pharmacology
Background:
- The impact of caffeine on blood pressure in individuals with hypertension is not well-established.
- Caffeine is a widely consumed stimulant with known cardiovascular effects.
Purpose of the Study:
- To investigate whether caffeine's vasoconstrictive effects are enhanced in men with borderline hypertension.
- To compare caffeine's impact on blood pressure and systemic vascular resistance in borderline hypertensive men versus normotensive controls.
Main Methods:
- A double-blind, placebo-controlled study involving 48 healthy men aged 20-35.
- Participants were categorized into borderline hypertensive (n=24) and low-risk control (n=24) groups based on screening blood pressure.
- Caffeine (3.3 mg/kg) or placebo was administered on separate occasions after 12-hour caffeine abstinence.
Main Results:
- Caffeine induced significantly larger increases in diastolic blood pressure (2-3 times greater) in borderline hypertensive men compared to controls (+8.4 vs +3.8 mm Hg).
- These blood pressure changes were associated with greater increases in systemic vascular resistance in the borderline group.
- Nearly all (96%) borderline subjects exhibited diastolic blood pressure increases exceeding the median control response, with 33% reaching hypertensive levels post-caffeine.
Conclusions:
- Borderline hypertensive men exhibit exaggerated diastolic blood pressure and systemic vascular resistance responses to caffeine.
- Caffeine consumption may exacerbate hypertension in susceptible individuals, potentially complicating diagnosis and treatment.
- Further research is warranted on caffeine's long-term effects in hypertensive populations.
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