Cited by 151Muscle metabolism and nutritionCardiovascular and exercise physiologyAdipose Tissue and Metabolism

Regulation and limitations to fatty acid oxidation during exercise

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Jeppesen, Jacob, Kiens, Bente·2012·The Journal of Physiology

Abstract

Abstract Fatty acids (FAs) as fuel for energy utilization during exercise originate from different sources: FAs transported in the circulation either bound to albumin or as triacylglycerol (TG) carried by very low density lipoproteins and FAs from lipolysis of muscle TG stores. Despite a high rate of energy expenditure during high intensity exercise the total FA oxidation is suppressed to below that observed during moderate intensity exercise. Although this has been known for many years, the mechanisms behind this phenomenon are still not fully elucidated. A failure of adipose tissue to deliver sufficient FAs to exercising muscle has been proposed, but evidence is emerging that factors within the muscle might be of more importance. The high rate of glycolysis during high intensity exercise might be the ‘driving force’ via the increased production of acetyl‐CoA, which in turn is trapped by carnitine. This will lead to decreased availability of free carnitine for long chain FA transport into mitochondria. This review summarizes our present view on how FA metabolism is regulated during exercise with a special focus on the limitations in FA oxidation in the transition from moderate to high intensity exercise in humans.

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Crossref · 10.1113/jphysiol.2011.225011

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  • FA transport across the muscle cell membrane occurs via transport proteins, mainly CD36.

    “Fatty acid transport across the muscle cell membrane occurs via transport proteins, mainly CD36 [24, 25].”

    From Understanding the factors that effect maximal fat oxidation. (2018) · cites this paper as [24]

  • Limitations to the rate of FAox appear to be mediated by cellular transport rather than systematic transport of serum FAs from adipose tissue.

    “Despite the positive circulatory effects of endurance training, limitations to the rate of FAox appear to be mediated by cellular transport rather than systematic transport of serum FAs from adipose tissue [24].”

    From Understanding the factors that effect maximal fat oxidation. (2018) · cites this paper as [24]

  • FAox is directly influenced by HAD activity in addition to the transport of FAs across the cellular and mitochondrial membranes.

    “Fatty acid oxidation is directly influenced by HAD activity [1, 18] in addition to the transport of FAs across the cellular and mitochondrial membranes [24, 37, 38].”

    From Understanding the factors that effect maximal fat oxidation. (2018) · cites this paper as [24]

  • As exercise intensity increases beyond moderate intensity, carnitine can be a limitation of FA substrate utilization due to the buffering of glycolytic acetyl-carnitine during high intensity exercise.

    “Therefore, as exercise intensity increases beyond moderate intensity, carnitine can be a limitation of FA substrate utilization due to the buffering of glycolytic acetyl-carnitine during high intensity exercise [24, 37, 38].”

    From Understanding the factors that effect maximal fat oxidation. (2018) · cites this paper as [24]

  • CPT-1 can be a FA transport limitation, ultimately reducing FAox at higher exercise intensities.

    “At exercise intensities >75% VO2max, muscle free carnitine concentrations decrease progressively [24] and therefore CPT-1 can be a FA transport limitation, ultimately reducing FAox at higher exercise intensities [24, 38].”

    From Understanding the factors that effect maximal fat oxidation. (2018) · cites this paper as [24]

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Authors
Jeppesen, J., & Kiens, B.
Affiliations
University of Copenhagen (DK)
Venue
The Journal of Physiology
Publisher
Wiley
Published
2012-03
Volume
590
Issue
5
Pages
1059-1068
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W2130411423
Cited by
151
References
60
Citations by year
2026: 10 · 2025: 8 · 2024: 7 · 2023: 10 · 2022: 6 · 2021: 8 · 2020: 14 · 2019: 16 · 2018: 15 · 2017: 7 · 2016: 11 · 2015: 10 · 2014: 16 · 2013: 11 · 2012: 2
FWCI
1.15
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
Keywords
fatty acid oxidation, physical activity, high-intensity exercise, moderate-intensity exercise, energy metabolism, triacylglycerol lipolysis, VLDL, L-carnitine, acetyl-CoA, glycolysis
MeSH terms
Animals, Fatty Acids, Humans, Mitochondria, Oxidation-Reduction, Exercise, Muscle, Skeletal

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