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Cardiac sarcolemma: compositional adaptation to exercise

G F Tibbits, T Nagatomo, M Sasaki

    Science (New York, N.Y.)
    |September 11, 1981
    PubMed
    Summary
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    Daily treadmill running significantly altered heart plasma membrane lipids in rats. Exercise training increased total phospholipid and phosphatidylserine content, potentially enhancing cardiac contractility.

    Area of Science:

    • Cardiovascular Physiology
    • Cellular Biology
    • Exercise Science

    Background:

    • Cardiac function relies on the integrity of the sarcolemma, the plasma membrane of heart muscle cells.
    • Exercise training is known to induce adaptations in cardiac structure and function.
    • Lipid composition of cellular membranes plays a crucial role in their physical properties and function.

    Purpose of the Study:

    • To investigate the impact of endurance exercise on the lipid composition of rat cardiac plasma membranes.
    • To determine if exercise-induced changes in membrane lipids correlate with enhanced cardiac function.

    Main Methods:

    • Isolation of highly purified plasma membranes from rat hearts.
    • Analysis of lipid composition, specifically total phospholipid and phosphatidylserine content.

    Related Experiment Videos

  • Comparison between a group of rats subjected to daily treadmill running and sedentary controls.

    • Main Results:

    • Significant alterations in lipid composition were observed in the plasma membranes of trained rats compared to sedentary controls.
    • Total phospholipid content in the sarcolemma increased by 23% in the trained group.
    • Phosphatidylserine content in the sarcolemma increased by 50% in the trained group.

    Conclusions:

    • Daily treadmill running induces substantial changes in the lipid profile of cardiac plasma membranes.
    • The observed increases in phospholipid and phosphatidylserine may represent an adaptive mechanism to enhance cardiac contractility.
    • These findings suggest a molecular basis for exercise-induced improvements in heart function.