Cited by 48Muscle metabolism and nutritionMuscle Physiology and DisordersCardiovascular and exercise physiology

Effects of skeletal muscle energy availability on protein turnover responses to exercise

Smiles, William J., Hawley, John A., Camera, Donny M.·2016·Journal of Experimental Biology

Abstract

Skeletal muscle adaptation to exercise training is a consequence of repeated contraction-induced increases in gene expression that lead to the accumulation of functional proteins whose role is to blunt the homeostatic perturbations generated by escalations in energetic demand and substrate turnover. The development of a specific 'exercise phenotype' is the result of new, augmented steady-state mRNA and protein levels that stem from the training stimulus (i.e. endurance or resistance based). Maintaining appropriate skeletal muscle integrity to meet the demands of training (i.e. increases in myofibrillar and/or mitochondrial protein) is regulated by cyclic phases of synthesis and breakdown, the rate and turnover largely determined by the protein's half-life. Cross-talk among several intracellular systems regulating protein synthesis, breakdown and folding is required to ensure protein equilibrium is maintained. These pathways include both proteasomal and lysosomal degradation systems (ubiquitin-mediated and autophagy, respectively) and the protein translational and folding machinery. The activities of these cellular pathways are bioenergetically expensive and are modified by intracellular energy availability (i.e. macronutrient intake) and the 'training impulse' (i.e. summation of the volume, intensity and frequency). As such, exercise-nutrient interactions can modulate signal transduction cascades that converge on these protein regulatory systems, especially in the early post-exercise recovery period. This review focuses on the regulation of muscle protein synthetic response-adaptation processes to divergent exercise stimuli and how intracellular energy availability interacts with contractile activity to impact on muscle remodelling.

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Crossref · 10.1242/jeb.125104

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Authors
Smiles, W. J., Hawley, J. A., & Camera, D. M.
Affiliations
  • Australian Catholic University (AU)
  • Liverpool John Moores University (GB)
Venue
Journal of Experimental Biology
Published
2016-01-01
Volume
219
Issue
2
Pages
214-225
ISSN
  • 0022-0949 (ISSN-L)
  • 1477-9145
OpenAlex
W2398539570
Cited by
48
References
154
Citations by year
2026: 3 · 2025: 1 · 2024: 2 · 2023: 8 · 2022: 8 · 2021: 2 · 2020: 4 · 2019: 5 · 2018: 7 · 2017: 7 · 2016: 1
FWCI
0.72
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Experimental Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Research Bank (Australian Catholic University) (submittedVersion)
  • HighWire Press Open Archive (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
Keywords
skeletal muscle, protein turnover, exercise training, energy availability, muscle protein synthesis, muscle protein degradation, autophagy, ubiquitin-proteasome degradation, myofibrillar proteins, mitochondrial proteins, post-exercise recovery, training impulse, macronutrient intake, signal transduction
MeSH terms
Animals, Energy Metabolism, Humans, Models, Biological, Muscle Proteins, Exercise, Muscle, Skeletal

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