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Related Experiment Videos

Ultrastructural changes in skeletal muscle after fatiguing exercise.

L J McCutcheon1, S K Byrd, D R Hodgson

  • 1Department of Veterinary and Comparative Anatomy, Washington State University, Pullman 99164.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 1, 1992
PubMed
Summary

Intense exercise in Thoroughbred horses significantly increases mitochondria and sarcoplasmic reticulum (SR) size in muscle cells. These cellular changes in muscle ultrastructure normalize after 60 minutes of recovery.

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Area of Science:

  • Equine Exercise Physiology
  • Muscle Ultrastructure
  • Cellular Biology

Background:

  • Understanding how exercise intensity affects equine muscle at a cellular level is crucial for optimizing training.
  • Mitochondria and sarcoplasmic reticulum (SR) are key organelles involved in muscle energy production and calcium handling.

Purpose of the Study:

  • To investigate the impact of varying exercise intensities and durations on the ultrastructure of mitochondria and SR in Thoroughbred horses.
  • To determine the recovery time needed for muscle ultrastructure to return to baseline.

Main Methods:

  • Thoroughbred horses exercised to fatigue at 40%, 85%, and 100% of maximal oxygen consumption (VO2max) on a treadmill and a 1,600-m gallop.
  • Muscle biopsies from the middle gluteal muscle collected pre-exercise, immediately post-exercise, and at 30 and 60 minutes of recovery.

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  • Electron microscopy used to quantify the area occupied by mitochondria and SR.

    • Main Results:

    • Exercise at intensities >40% VO2max significantly increased mitochondrial area (3-4 fold) and SR area (approx. 1.6 fold).
    • Exercise at 40% VO2max resulted in smaller increases in these organelles.
    • Mitochondrial and SR areas returned to pre-exercise levels by 60 minutes of recovery.
    • Ultrastructural changes correlated with the normalization of muscle temperature, pH, and metabolites.

    Conclusions:

    • High-intensity exercise induces significant, but reversible, ultrastructural adaptations in equine skeletal muscle mitochondria and SR.
    • These adaptations are intensity-dependent and fully resolve within 60 minutes of recovery.
    • The findings provide insights into the cellular mechanisms of equine muscle fatigue and recovery.