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Exercise and small intestinal transit.

K J Ollerenshaw, S Norman, C G Wilson

    Nuclear Medicine Communications
    |February 1, 1987
    PubMed
    Summary
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    Exercise does not significantly impact small intestine transit time for controlled-release drugs. This suggests drug bioavailability remains consistent during normal daily activities, regardless of physical exertion levels.

    Area of Science:

    • Gastroenterology
    • Nuclear Medicine
    • Pharmacokinetics

    Background:

    • Drug bioavailability is influenced by gastrointestinal transit times.
    • Controlled-release drug formulations depend on predictable transit for consistent drug delivery.
    • The effect of physical activity on small intestinal transit is not fully understood.

    Purpose of the Study:

    • To investigate the effect of varying exercise intensities on small intestine transit time.
    • To assess the potential impact of exercise-induced transit changes on drug bioavailability.

    Main Methods:

    • Utilized technetium-99m (99Tcm)-labelled particles to track transit.
    • Monitored small intestine transit in nine healthy subjects.
    • Subjects underwent three levels of physical activity: minimal, moderate, and strenuous exercise.

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    Main Results:

    • Mean small intestine transit times were 4.5 +/- 1.7 hours (minimal), 5.4 +/- 2.5 hours (moderate), and 4.1 +/- 1.8 hours (strenuous).
    • No statistically significant difference in transit times was observed across the different exercise conditions.
    • Variations in transit times were within the normal range observed in previous studies.

    Conclusions:

    • Physical activity, including moderate and strenuous exercise, does not significantly alter small intestine transit times.
    • The bioavailability of drugs from controlled-release preparations is unlikely to be affected by variations in normal daily physical activity.
    • These findings support the use of controlled-release oral drug formulations in patients with varying activity levels.