Cited by 187Cardiovascular and exercise physiologyExercise and Physiological ResponsesMitochondrial Function and Pathology

Adaptation of skeletal muscle to endurance exercise

HOLLOSZY, JOHN O.·1975·Medicine and Science in Sports and Exercise

Abstract

Skeletal muscle adapts to endurance excerise, such as long distance running, with an increase in the capacity for aerobic metabolism. This is reflected in an increased capacity of whole homogenates and of the mitochondrial fraction of muscle to oxidize pyruvate and long chain fatty acids. Underlying this increase in the ability to obtain energy by respiration is an increase in the levels of a number of mitochondrial enzymes. These include the enzymes involved in fatty acid oxidation, the enzymes of the citric acid cycle, the components of the respiratory chain that link the oxidation of succinate and NADH to oxygen, and coupling factor 1. These increases in mitochondrial enzyme activity appear to be due to an increase in enzyme protein as evidenced by a doubling of the concentration of cytochrome c and a 60% increase in the protein content of the mitochondrial fraction skeletal muscle. Electronmicroscopic studies suggest that increases in both the size and number of mitochondria are responsible for the increase in mitochondrial protein. An alteration in mitochondrial composition also occurs, with some mitochondrial enzymes increasing 2-fold, others increasing only 35% to 60%, while others, including mitochondrial alpha-glycerophosphate dehydrogenase, creatine phosphokinase and adenylate kinase do not increase at all. As a result of these and other exercise induced biochemical adaptations skeletal muscle tends to become more like heart muscle in its enzyme pattern.

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Crossref · 10.1249/00005768-197500730-00013

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Authors
HOLLOSZY, J. O.
Affiliations
Washington University in St. Louis (US)
Corresponding author
HOLLOSZY, JOHN O.
Venue
Medicine and Science in Sports and Exercise
Published
1975
Volume
7
Issue
3
Pages
155???164
ISSN
0195-9131 (ISSN-L)
OpenAlex
W2035731143
Cited by
186
References
0
Citations by year
2025: 3 · 2024: 1 · 2023: 3 · 2022: 1 · 2021: 4 · 2020: 6 · 2019: 4 · 2018: 3 · 2017: 8 · 2016: 6 · 2015: 5 · 2014: 10 · 2013: 6 · 2012: 2
FWCI
10.38
Type
journal article
Language
en
Open access
closed
Locations
  • Medicine & Science in Sports & Exercise (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
skeletal muscle, endurance exercise, aerobic metabolism, mitochondrial enzymes, fatty acid oxidation, TCA cycle, electron transport chain, coupling factor 1, cytochrome c, mitochondrial protein content, mitochondrial biogenesis, muscle fiber type shift, long-distance running
MeSH terms
Adaptation, Physiological, Adenosine Diphosphate, Adenosine Triphosphate, Adenylate Kinase, Animals, Creatine Kinase, Energy Transfer, Physical Exertion, Glycerolphosphate Dehydrogenase, Hexokinase, Humans, Lactates, Male, Mitochondria, Muscle, Muscles, Myocardium, Myoglobin, NAD, NADH, NADPH Oxidoreductases, Oxygen Consumption, Rats

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