Cited by 100Exercise and Physiological ResponsesMuscle Physiology and DisordersAutophagy in Disease and Therapy

Autophagic response to strenuous exercise in mouse skeletal muscle fibers

Salminen, A., Vihko, V.·1984·Virchows Archiv B Cell Pathology Including Molecular Pathology

Abstract

Strenuous physical exercise induces necrosis of skeletal muscle fibers and increases lysosomal enzyme activities in surviving muscle fibers. This study examines the ultrastructural basis of the stimulation of the lysosomal system in mouse vastus medialis muscle during the appearance and repair of exercise-induced (9 h of running) injuries. Necrotic fibers appeared the day after exercise and an inflammatory response with the replacement of necrotic fibers by phagocytes was highest 2-3 days after exertion. Ultrastructural study of surviving muscle fibers revealed numerous autophagic vacuoles, residual bodies, and spheromembranous structures at the periphery of myofibers, especially in fibers adjacent to necrotic fibers. The autophagic response was most prominent between 2 and 7 days after exertion. Autophagic vacuoles with double or single limiting membranes contained mitochondria at various stages of degradation. Vacuolar and multilamellar structures were also observed in regenerating muscle fibers. The structure of injured skeletal muscle fibers returned to normal within 2 weeks. It is proposed that increased autophagic activity could be related to the breakdown of cellular constituents of surviving muscle fibers to provide structural elements for regenerating muscle fibers.

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Crossref · 10.1007/bf02889856

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29 of 29 references verified0 citation errors · 0 not checkable

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  • The positive effect of exercise on autophagy was first noted in 1984, with the observation of autophagosome accumulation after exercise in rat skeletal muscle.

    “The positive effect of exercise on autophagy was first noted in 1984, with the observation of autophagosome accumulation after exercise in rat skeletal muscle [482].”
  • Similar effects have been seen in humans and mice after strenuous exercise, interpreted as a response to exercise-related muscle breakdown.

    “Similar effects have been seen in humans and mice after strenuous exercise, interpreted as a response to exercise-related muscle breakdown [482,483].”

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Authors
Salminen, A., & Vihko, V.
Affiliations
University of Jyväskylä (FI)
Venue
Virchows Archiv B Cell Pathology Including Molecular Pathology
Published
1984-01
Volume
45
Issue
1
Pages
97-106
ISSN
  • 0340-6075 (ISSN-L)
  • 0042-6431
OpenAlex
W2045927301
Cited by
100
References
29
Citations by year
2026: 2 · 2025: 1 · 2024: 4 · 2023: 1 · 2022: 3 · 2021: 12 · 2020: 4 · 2019: 2 · 2018: 4 · 2017: 6 · 2016: 4 · 2015: 7 · 2014: 2 · 2013: 4 · 2012: 1
FWCI
10.05
Type
journal article
Language
en
Open access
closed
Locations
  • Virchows Archiv B Cell Pathology Including Molecular Pathology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
autophagy, exercise-induced muscle damage, lysosomal system, autophagosomes, vastus medialis, muscle regeneration, muscle ultrastructure, mitochondrial degradation, phagocytes, muscle inflammation, running
MeSH terms
Animals, Autophagy, Physical Exertion, Glucuronidase, Lysosomes, Male, Microscopy, Electron, Muscles, Necrosis, Phagocytosis, Regeneration, Time Factors, Mice

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