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Related Experiment Videos

Limited oxygen diffusion accelerates fatigue development in mouse skeletal muscle.

Shi-Jin Zhang1, Joseph D Bruton, Abram Katz

  • 1Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.

The Journal of Physiology
|February 4, 2006
PubMed
Summary

Skeletal muscle fatigue mechanisms were studied by comparing whole muscles and single fibers. Hypoxia, not lactic acid or potassium, accelerates fatigue by impairing calcium release from the sarcoplasmic reticulum.

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Area of Science:

  • Physiology
  • Muscle Biology
  • Exercise Science

Background:

  • Whole skeletal muscles fatigue faster than isolated single muscle fibers.
  • Understanding the underlying mechanisms of muscle fatigue is crucial for sports science and clinical applications.

Purpose of the Study:

  • To investigate the mechanisms of skeletal muscle fatigue by comparing fatigue development in isolated whole muscles and single muscle fibers.
  • To determine the roles of lactic acid, potassium ions, and hypoxia in skeletal muscle fatigue.

Main Methods:

  • Isolated whole soleus and extensor digitorum longus (EDL) muscles, and single soleus muscle fibers were subjected to repeated tetanic stimulation.
  • Force production was measured throughout the fatiguing protocol.
  • Myoplasmic free calcium ion concentration ([Ca(2+)]) was measured in single fibers.

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  • Experiments were conducted under control conditions and with interventions such as lactic acid, increased potassium concentration, and cyanide to inhibit mitochondrial respiration.

    • Main Results:

    • Neither lactic acid nor increased extracellular potassium significantly affected fatigue rate in whole muscles during repeated brief tetani.
    • Inhibition of mitochondrial respiration with cyanide accelerated fatigue development in both whole muscles and single fibers.
    • Fatigue in the presence of cyanide was associated with a decrease in tetanic myoplasmic free calcium ion concentration ([Ca(2+)]) in single fibers.
    • Single muscle fibers showed greater fatigue resistance than whole muscles under control conditions, but this difference diminished with cyanide treatment.

    Conclusions:

    • Lactic acid and extracellular potassium have minimal impact on fatigue induced by repeated tetanic stimulation.
    • Hypoxia, induced by mitochondrial inhibition, significantly accelerates skeletal muscle fatigue.
    • Impaired calcium release from the sarcoplasmic reticulum due to hypoxia is a primary mechanism contributing to rapid muscle fatigue.