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Caffeine and cerebral blood flow.

R J Mathew, D L Barr, M L Weinman

    The British Journal of Psychiatry : the Journal of Mental Science
    |December 1, 1983
    PubMed
    Summary
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    Caffeine consumption significantly reduces regional cerebral blood flow (rCBF) in healthy adults. Dosages of 250 mg and 500 mg caffeine demonstrated similar decreases in rCBF without affecting other physiological measures.

    Area of Science:

    • Neuroscience
    • Pharmacology
    • Physiology

    Background:

    • Cerebral blood flow (CBF) is crucial for brain function.
    • Caffeine is a widely consumed stimulant with known physiological effects.
    • Understanding caffeine's impact on CBF is important for cognitive and neurological research.

    Purpose of the Study:

    • To investigate the acute effects of oral caffeine on regional cerebral blood flow (rCBF) in healthy volunteers.
    • To determine if different caffeine dosages (250 mg vs. 500 mg) elicit varying changes in rCBF.
    • To assess potential regional differences in caffeine-induced rCBF alterations.

    Main Methods:

    • Utilized the 133Xenon inhalation technique to measure rCBF.
    • Administered oral caffeine (250 mg or 500 mg) to two groups of normal volunteers.

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  • Included a control group measured twice under identical conditions without caffeine.
  • Monitored physiological parameters including end-tidal carbon dioxide, pulse rate, blood pressure, and respiratory rate.

    • Main Results:

    • Caffeine administration led to significant reductions in rCBF compared to baseline.
    • No significant difference in the degree of rCBF reduction was observed between the 250 mg and 500 mg caffeine groups.
    • No significant regional variations in the post-caffeine decrease in cerebral blood flow were detected.
    • Control group showed no significant change in rCBF between measurements.
    • No significant changes in end-tidal carbon dioxide, pulse rate, blood pressure, forehead skin temperature, or respiratory rate were observed across all groups.

    Conclusions:

    • Oral caffeine intake causes a dose-independent reduction in regional cerebral blood flow in healthy individuals.
    • Caffeine's effect on cerebral blood flow is systemic rather than regionally specific.
    • Caffeine does not appear to significantly alter key physiological parameters like blood pressure or heart rate at the tested dosages.