Cited by 74Muscle metabolism and nutritionCardiovascular and exercise physiologySports Performance and Training

Influence of prolonged endurance cycling and recovery diet on intramuscular triglyceride content in trained males

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van Loon, Luc J. C., Schrauwen-Hinderling, Vera B., Koopman, René, Wagenmakers, Anton J. M., Hesselink, Matthijs K. C., Schaart, Gert, Kooi, M. Eline, Saris, Wim H. M.·2003·American Journal of Physiology-Endocrinology and Metabolism

Abstract

Intramuscular triglycerides (IMTG) are assumed to form an important substrate source during prolonged endurance exercise in trained males. This study investigated the effects of endurance exercise and recovery diet on IMTG content in vastus lateralis muscle. Nine male cyclists were provided with a standardized diet for 3 days, after which they performed a 3-h exercise trial at a 55% maximum workload. Before and immediately after exercise and after 24 and 48 h of recovery, magnetic resonance spectroscopy (MRS) was performed to quantitate IMTG content. Muscle biopsies were taken after 48 h of recovery to determine IMTG content by using quantitative fluorescence microscopy. The entire procedure was performed two times; in one trial, a normal diet containing 39% energy (En%) as fat was provided (NF) and in the other a typical carbohydrate-rich athlete's diet (LF: 24 En% fat) was provided. During exercise, IMTG content decreased by 21.4 ± 3.1%. During recovery, IMTG content increased significantly in the NF trial only, reaching preexercise levels within 48 h. In accord with MRS, fluorescence microscopy showed significantly higher IMTG content in the NF compared with the LF trial, with differences restricted to the type I muscle fibers (2.1 ± 0.2 vs. 1.4 ± 0.2% area lipid staining, respectively). In conclusion, IMTG content in the vastus lateralis muscle declines significantly during prolonged endurance exercise in male cyclists. When a normal diet is used, IMTG contents are subsequently repleted within 48 h of postexercise recovery. In contrast, IMTG repletion is impaired substantially when a typical, carbohydrate-rich athlete's diet is used. Data obtained by quantitative fluorescence microscopy correspond well with MRS results, implying that both are valid methods to quantify IMTG content.

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Crossref · 10.1152/ajpendo.00112.2003

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Authors
van Loon, L. J. C., Schrauwen-Hinderling, V. B., Koopman, R., Wagenmakers, A. J. M., Hesselink, M. K. C., Schaart, G., Kooi, M. E., & Saris, W. H. M.
Affiliations
Maastricht University (NL)
Venue
American Journal of Physiology-Endocrinology and Metabolism
Published
2003-10
Volume
285
Issue
4
Pages
E804-E811
ISSN
  • 0193-1849 (ISSN-L)
  • 1522-1555
OpenAlex
W2100240363
Cited by
74
References
57
Citations by year
2025: 2 · 2024: 1 · 2023: 4 · 2022: 4 · 2021: 3 · 2020: 5 · 2019: 1 · 2018: 4 · 2017: 1 · 2016: 3 · 2015: 2 · 2014: 3 · 2013: 5 · 2012: 2
FWCI
2.42
Type
journal article
Language
en
Licence
other-oa
Locations
  • American Journal of Physiology-Endocrinology and Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • TU/e Research Portal (publishedVersion)
  • Research Publications (Maastricht University) (submittedVersion, other-oa)
  • TU/e Research Portal (submittedVersion)
  • University of Birmingham Research Portal (University of Birmingham) (submittedVersion)
Funders
National Institute of Child Health and Human Development
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 › Orthopedics and Sports Medicine › Sports Performance and Training
Keywords
intramuscular triglycerides, endurance cycling, dietary fat intake, vastus lateralis, type I muscle fibers, energy substrate utilization, trained cyclists, magnetic resonance spectroscopy, quantitative fluorescence microscopy
MeSH terms
Adult, Dietary Carbohydrates, Energy Metabolism, Exercise Test, Humans, Male, Magnetic Resonance Spectroscopy, Oxygen Consumption, Physical Endurance, Triglycerides, Muscle, Skeletal, Diet, Fat-Restricted

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