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Aging and ethanol metabolism

R E Vestal, E A McGuire, J D Tobin

    Clinical Pharmacology and Therapeutics
    |March 1, 1977
    PubMed
    Summary
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    Aging does not affect ethanol elimination rates but leads to higher peak blood concentrations due to decreased lean body mass and smaller distribution volume. Body composition changes impact ethanol metabolism in older adults.

    Area of Science:

    • Pharmacology
    • Gerontology
    • Toxicology

    Background:

    • Ethanol (alcohol) metabolism and its effects can vary significantly with age.
    • Understanding age-related changes in ethanol distribution and elimination is crucial for assessing its pharmacologic effects and potential risks.

    Purpose of the Study:

    • To investigate the impact of aging on the distribution and elimination kinetics of ethanol in healthy adults.
    • To determine if age influences ethanol elimination rates and peak blood concentrations.
    • To explore the relationship between body composition, ethanol distribution, and observed concentrations in different age groups.

    Main Methods:

    • A continuous 1-hour infusion of ethanol was administered to 50 healthy subjects aged 21-81 years.
    • Serial blood samples were collected for up to 4 hours post-infusion to measure ethanol concentration.

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  • A two-compartment model was utilized to evaluate ethanol elimination and distribution parameters.

    • Main Results:

    • Ethanol elimination rates were not significantly affected by age.
    • Peak blood ethanol concentrations at the end of infusion showed a positive correlation with age (r=0.55).
    • Lean body mass and the total volume of distribution for ethanol were negatively correlated with age.

    Conclusions:

    • Age-related decreases in lean body mass and total volume of distribution contribute to higher peak blood ethanol concentrations in older adults.
    • Body composition changes are significant factors influencing ethanol metabolism and its pharmacologic effects across the lifespan.
    • These findings highlight the importance of considering age-related physiological alterations in ethanol dosing and risk assessment.