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Physical performance and serum potassium under chronic beta-blockade.

T Kullmer, W Kindermann

    European Journal of Applied Physiology and Occupational Physiology
    |January 1, 1985
    PubMed
    Summary
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    Beta-blockers increase serum potassium during exercise in athletes, impacting muscle fatigue. This study confirms beta-receptor regulation of potassium transport in skeletal muscle.

    Area of Science:

    • Exercise Physiology
    • Pharmacology
    • Cellular Biology

    Background:

    • Beta-2-receptor regulated potassium transport exists in human skeletal muscle.
    • Beta-receptor blockade may influence serum potassium levels and cause muscle fatigue during exercise.

    Purpose of the Study:

    • To investigate if serum potassium alterations are a cause of premature muscular fatigue during exercise under beta-receptor blockade.
    • To compare the effects of beta 1-selective and non-selective beta-blockers on serum potassium levels during exercise.

    Main Methods:

    • 63 healthy students received Metoprolol (beta 1-selective), Propranolol (non-selective), or placebo daily for 3 months.
    • Serum potassium was measured before, during, and after a graded bicycle exercise test.
    • Participants were randomized and treated under double-blind conditions.

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    Main Results:

    • Beta-blocker treatment resulted in significantly higher serum potassium levels during exercise compared to placebo.
    • Serum potassium levels took longer to return to resting levels after exercise in beta-blocker groups.
    • Propranolol led to higher post-exercise serum potassium than Metoprolol; differences resolved after medication cessation.

    Conclusions:

    • Confirms a beta-receptor regulated potassium transport system in human skeletal muscle.
    • Transmembrane potassium transport in skeletal muscle is primarily regulated by beta-2 receptors, with some beta-1 receptor involvement.
    • Beta-blocker-induced alterations in serum potassium during exercise may contribute to muscle fatigue.