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Persistent cardiovascular effects with repeated caffeine administration.

J D Lane1, D C Manus

  • 1Department of Psychiatry, Duke University Medical Center, Durham, North Carolina 27710.

Psychosomatic Medicine
|July 1, 1989
PubMed
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Repeated caffeine intake can increase heart rate and blood pressure, indicating that cardiovascular effects persist throughout the day. Habitual caffeine use may not lead to full tolerance, potentially increasing cardiovascular disease risk.

Area of Science:

  • Cardiovascular Physiology
  • Pharmacology

Background:

  • Habitual caffeine consumption involves repeated daily dosing.
  • The persistence of caffeine's cardiovascular effects with repeated use is not well understood.

Purpose of the Study:

  • To investigate the cardiovascular response to repeated moderate caffeine administration.
  • To determine if tolerance develops to caffeine's cardiovascular effects after repeated dosing.

Main Methods:

  • Healthy male habitual caffeine users (n=10) received a pretreatment caffeine dose (125 mg).
  • Following a washout period, a second dose of either caffeine or placebo was administered.
  • Blood pressure and heart rate were monitored for 2 hours pre- and 1.5 hours post-second dose.

Main Results:

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  • The second caffeine dose significantly increased heart rate compared to placebo.
  • Diastolic and mean arterial blood pressures were significantly elevated by the second caffeine dose.
  • Systolic blood pressure did not show a significant change after the second caffeine dose.

Conclusions:

  • Cardiovascular effects of caffeine can persist with repeated daily administration of moderate doses.
  • Habitual caffeine use does not necessarily induce complete tolerance to its cardiovascular effects.
  • These persistent effects suggest a potential contribution to increased cardiovascular disease risk.