Time course of ultrastructural changes in skeletal muscle after two types of exercise

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Colleges, School and Institutes


To ascertain the effects of sprint and endurance exercise on the time course of skeletal muscle mitochondrial changes, an ultrastructural study was conducted on four Thoroughbred horses. Skeletal muscle biopsies were taken at various intervals during and after the exercise. Transient mitochondrial alterations of varying degrees were observed following both types of exercise and were considered to be related to the development of fatigue. The degree of distortion of mitochondrial structure is considered not to represent the in vivo condition but the state of responsiveness to the fixation medium.


Original languageEnglish
Pages (from-to)910-3
Number of pages4
JournalAmerican Journal of Physiology
Issue number4
Publication statusPublished - Apr 1982


  • Animals, Hindlimb, Horses, Mitochondria, Muscle, Muscles, Physical Endurance, Physical Exertion, Time Factors