Cited by 145Muscle metabolism and nutritionCardiovascular and exercise physiologyMetabolism, Diabetes, and Cancer

Exercise in the fasted state facilitates fibre type‐specific intramyocellular lipid breakdown and stimulates glycogen resynthesis in humans

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De Bock, K., Richter, E. A., Russell, A. P., Eijnde, B. O., Derave, W., Ramaekers, M., Koninckx, E., Léger, B. +2 more·2005·The Journal of Physiology

Abstract

The effects were compared of exercise in the fasted state and exercise with a high rate of carbohydrate intake on intramyocellular triglyceride (IMTG) and glycogen content of human muscle. Using a randomized crossover study design, nine young healthy volunteers participated in two experimental sessions with an interval of 3 weeks. In each session subjects performed 2 h of constant‐load bicycle exercise (∼75%), followed by 4 h of controlled recovery. On one occasion they exercised after an overnight fast (F), and on the other (CHO) they received carbohydrates before (∼150 g) and during (1 g (kg bw)−1 h−1) exercise. In both conditions, subjects ingested 5 g carbohydrates per kg body weight during recovery. Fibre type‐specific relative IMTG content was determined by Oil red O staining in needle biopsies from m. vastus lateralis before, immediately after and 4 h after exercise. During F but not during CHO, the exercise bout decreased IMTG content in type I fibres from 18 ± 2% to 6 ± 2% (P= 0.007) area lipid staining. Conversely, during recovery, IMTG in type I fibres decreased from 15 ± 2% to 10 ± 2% in CHO, but did not change in F. Neither exercise nor recovery changed IMTG in type IIa fibres in any experimental condition. Exercise‐induced net glycogen breakdown was similar in F and CHO. However, compared with CHO (11.0 ± 7.8 mmol kg−1 h−1), mean rate of postexercise muscle glycogen resynthesis was 3‐fold greater in F (32.9 ± 2.7 mmol kg−1 h−1, P= 0.01). Furthermore, oral glucose loading during recovery increased plasma insulin markedly more in F (+46.80 μU ml−1) than in CHO (+14.63 μU ml−1, P= 0.02). We conclude that IMTG breakdown during prolonged submaximal exercise in the fasted state takes place predominantly in type I fibres and that this breakdown is prevented in the CHO‐fed state. Furthermore, facilitated glucose‐induced insulin secretion may contribute to enhanced muscle glycogen resynthesis following exercise in the fasted state.

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Crossref · 10.1113/jphysiol.2005.083170

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  • Training in the fasted state may induce more profound adaptations than training in the fed state.

    “Studies by Hespel and coworkers [34, 35] demonstrated that training in the fasted state may induce more profound adaptations then training in the fed state (a carbohydrate-containing breakfast and consuming carbohydrates during exercise).”

    From Periodized Nutrition for Athletes (2017) · cites this paper as [35]

  • Exercise in the fasted state facilitated intramuscular fat use during exercise and improved glycogen resynthesis.

    “De Bock et al. [35] showed that exercise in the fasted state facilitated intramuscular fat use during exercise and improved glycogen resynthesis [35].”

    From Periodized Nutrition for Athletes (2017) · cites this paper as [35]

  • Exogenous carbohydrate during exercise may alter endogenous depletion of glycogen and rates of subsequent glycogen re-synthesis.

    “It is also important to note that exogenous carbohydrate during exercise may alter endogenous depletion of glycogen (De Bock 2005) and rates of subsequent glycogen re-synthesis (Reinert et al. 2009).”

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Research works printed but not linked: 1

  1. Rowell L B & Shepherd JT, pp. 1124-1150. Oxford University Press, New York.

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Authors
De Bock, K., Richter, E. A., Russell, A. P., Eijnde, B. O., Derave, W., Ramaekers, M., Koninckx, E., Léger, B., Verhaeghe, J., & Hespel, P.
Affiliations
  • University of Copenhagen (DK)
  • Clinique Romande de Réadaptation (CH)
  • KU Leuven (BE)
Venue
The Journal of Physiology
Publisher
Wiley
Published
2005-04
Volume
564
Issue
2
Pages
649-660
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W2146917678
Cited by
145
References
66
Citations by year
2026: 4 · 2025: 1 · 2024: 7 · 2023: 4 · 2022: 6 · 2021: 13 · 2020: 16 · 2019: 7 · 2018: 10 · 2017: 9 · 2016: 5 · 2015: 8 · 2014: 4 · 2013: 6 · 2012: 5
FWCI
2.44
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • Lirias (KU Leuven) (submittedVersion, other-oa)
  • Ghent University Academic Bibliography (Ghent University) (submittedVersion)
  • Own your potential (DEAKIN) (submittedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
Funders
  • Sundhed og Sygdom, Det Frie Forskningsråd (LSHM-CT-2004-005272)
  • European Commission (LSHMCT-2004-005272)
  • Novo Nordisk
  • Vlaamse regering
  • Kulturministeriet
  • Diabetesforeningen
  • Directorate for Biological Sciences
  • Medical Research Council
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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
intramyocellular triglyceride, muscle fiber type, type I muscle fibers, muscle glycogen resynthesis, glycogenolysis, insulin secretion, glucose load, vastus lateralis, submaximal exercise, lipid metabolism
MeSH terms
Adult, Dietary Carbohydrates, Fasting, Glycogen, Humans, Male, Triglycerides, Exercise, Muscle Fibers, Skeletal, Cross-Over Studies, Muscle Fibers, Slow-Twitch

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