Cited by 150Muscle metabolism and nutritionMetabolism, Diabetes, and CancerMuscle Physiology and Disorders

Influence of muscle glycogen availability on ERK1/2 and Akt signaling after resistance exercise in human skeletal muscle

Creer, Andrew, Gallagher, Philip, Slivka, Dustin, Jemiolo, Bozena, Fink, William, Trappe, Scott·2005·Journal of Applied Physiology

Abstract

Two pathways that have been implicated for cellular growth and development in response to muscle contraction are the extracellular signal-regulated kinase (ERK1/2) and Akt signaling pathways. Although these pathways are readily stimulated after exercise, little is known about how nutritional status may affect stimulation of these pathways in response to resistance exercise in human skeletal muscle. To investigate this, experienced cyclists performed 30 repetitions of knee extension exercise at 70% of one repetition maximum after a low (2%) or high (77%) carbohydrate (LCHO or HCHO) diet, which resulted in low or high (approximately 174 or approximately 591 mmol/kg dry wt) preexercise muscle glycogen content. Muscle biopsies were taken from the vastus lateralis before, approximately 20 s after, and 10 min after exercise. ERK1/2 and p90 ribosomal S6 kinase phosphorylation increased (P < or = 0.05) 10 min after exercise, regardless of muscle glycogen availability. Akt phosphorylation was elevated (P < 0.05) 10 min after exercise in the HCHO trial but was unaffected after exercise in the LCHO trial. Mammalian target of rapamycin phosphorylation was similar to that of Akt during each trial; however, change or lack of change was not significant. In conclusion, the ERK1/2 pathway appears to be unaffected by muscle glycogen content. However, muscle glycogen availability appears to contribute to regulation of the Akt pathway, which may influence cellular growth and adaptation in response to resistance exercise in a low-glycogen state.

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Crossref · 10.1152/japplphysiol.00110.2005

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Authors
Creer, A., Gallagher, P., Slivka, D., Jemiolo, B., Fink, W., & Trappe, S.
Affiliations
Ball State University (US)
Venue
Journal of Applied Physiology
Published
2005-09
Volume
99
Issue
3
Pages
950-956
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2166195206
Cited by
150
References
47
Citations by year
2025: 1 · 2024: 3 · 2023: 5 · 2022: 5 · 2021: 2 · 2020: 2 · 2019: 8 · 2018: 3 · 2017: 7 · 2016: 6 · 2015: 7 · 2014: 18 · 2013: 10 · 2012: 9
FWCI
3.52
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute on Aging (AG 18409, R01AG018409)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
muscle glycogen, resistance training, ERK signaling, Akt signaling, p90 ribosomal S6 kinase, mTOR, skeletal muscle, dietary carbohydrates, muscle hypertrophy, vastus lateralis, exercise adaptation
MeSH terms
Adult, Dietary Carbohydrates, Glycogen, Humans, Knee Joint, Male, Muscle Contraction, Physical Endurance, Proto-Oncogene Proteins, Signal Transduction, Protein Serine-Threonine Kinases, Muscle, Skeletal, Mitogen-Activated Protein Kinase 1, Mitogen-Activated Protein Kinase 3, Proto-Oncogene Proteins c-akt

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