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Training-induced morphological and functional changes in skeletal muscle

H Howald

    International Journal of Sports Medicine
    |February 1, 1982
    PubMed
    Summary
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    Human skeletal muscle fibers adapt molecularly, changing contractile proteins like actin and myosin. Training and genetics influence fiber type distribution and transformation, impacting athletic performance.

    Area of Science:

    • Muscle physiology
    • Molecular biology
    • Sports science

    Background:

    • Human skeletal muscle exhibits plasticity, adapting at cellular, metabolic, and molecular levels.
    • Contractile proteins (actin, myosin, tropomyosin, troponin) are crucial for muscle function and vary across fiber types.
    • Fiber type distribution is influenced by genetic and environmental factors.

    Purpose of the Study:

    • To investigate the molecular structure of contractile proteins in different human skeletal muscle fiber types.
    • To understand the adaptability of muscle fibers to various influences, including training and stimulation.
    • To explore the factors determining fiber type distribution in athletes.

    Main Methods:

    • Histochemical ATPase staining techniques.

    Related Experiment Videos

  • Immunohistochemistry for protein analysis.
  • Two-dimensional gel electrophoresis for molecular profiling.

    • Main Results:

    • Advanced techniques reveal molecular differences in contractile proteins across human skeletal muscle fiber types.
    • Muscle fibers demonstrate significant plasticity, adapting molecularly to environmental and genetic factors.
    • Endurance training may convert Type II to Type I fibers, while strength training impacts ultrastructure and metabolism.

    Conclusions:

    • Muscle fiber adaptation occurs at the molecular level of contractile proteins.
    • Fiber type transformation is achievable through interventions like cross-innervation and electrical stimulation.
    • Both genetic predispositions and environmental factors, including training, shape fiber type patterns in athletes.