Cited by 973Muscle metabolism and nutritionSports Performance and TrainingMuscle Physiology and Disorders

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Ingested protein dose response of muscle and albumin protein synthesis after resistance exercise in young men

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Abstract

Background The anabolic effect of resistance exercise is enhanced by the provision of dietary protein.Objectives We aimed to determine the ingested protein dose response of muscle (MPS) and albumin protein synthesis (APS) after resistance exercise. In addition, we measured the phosphorylation of candidate signaling proteins thought to regulate acute changes in MPS.Design Six healthy young men reported to the laboratory on 5 separate occasions to perform an intense bout of leg-based resistance exercise. After exercise, participants consumed, in a randomized order, drinks containing 0, 5, 10, 20, or 40 g whole egg protein. Protein synthesis and whole-body leucine oxidation were measured over 4 h after exercise by a primed constant infusion of [1-(13)C]leucine.Results MPS displayed a dose response to dietary protein ingestion and was maximally stimulated at 20 g. The phosphorylation of ribosomal protein S6 kinase (Thr(389)), ribosomal protein S6 (Ser(240/244)), and the epsilon-subunit of eukaryotic initiation factor 2B (Ser(539)) were unaffected by protein ingestion. APS increased in a dose-dependent manner and also reached a plateau at 20 g ingested protein. Leucine oxidation was significantly increased after 20 and 40 g protein were ingested.Conclusions Ingestion of 20 g intact protein is sufficient to maximally stimulate MPS and APS after resistance exercise. Phosphorylation of candidate signaling proteins was not enhanced with any dose of protein ingested, which suggested that the stimulation of MPS after resistance exercise may be related to amino acid availability. Finally, dietary protein consumed after exercise in excess of the rate at which it can be incorporated into tissue protein stimulates irreversible oxidation.

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Crossref · 10.3945/ajcn.2008.26401

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Metadata

Authors
Moore, D. R., Robinson, M. J., Fry, J. L., Tang, J. E., Glover, E. I., Wilkinson, S. B., Prior, T., Tarnopolsky, M. A., & Phillips, S. M.
Affiliations
McMaster University (CA)
Corresponding author
Phillips, Stuart M
Venue
The American Journal of Clinical Nutrition
Publisher
Elsevier BV
Published
2009-01
Volume
89
Issue
1
Pages
161-168
ISSN
0002-9165 (ISSN-L)
OpenAlex
W2146458354
Cited by
973
References
50
Citations by year
2026: 55 · 2025: 39 · 2024: 46 · 2023: 44 · 2022: 42 · 2021: 64 · 2020: 60 · 2019: 63 · 2018: 64 · 2017: 66 · 2016: 70 · 2015: 65 · 2014: 60 · 2013: 72 · 2012: 61
FWCI
14.32
Type
journal article
Language
en
Open access
Locations
  • American Journal of Clinical Nutrition (publishedVersion)
  • PubMed (publishedVersion)
  • Loughborough University Institutional Repository (Loughborough University) (submittedVersion, cc-by-nc-nd)
  • Loughborough University Research Repository (Loughborough University) (submittedVersion, cc-by-nc-nd)
Funders
  • McMaster University
  • Canadian Institutes of Health Research
  • Natural Sciences and Engineering Research Council of Canada
Topics
  • Health Sciences › Nursing › Nutrition and Dietetics › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
muscle protein synthesis, resistance training, whole egg protein, leucine oxidation, S6K, ribosomal protein S6, eIF2B, amino acid availability
MeSH terms
Carbon Isotopes, Dose-Response Relationship, Drug, Humans, Leucine, Male, Muscle Proteins, Oxidation-Reduction, Phosphorylation, Serum Albumin, Weight Lifting, Egg Proteins, Dietary, Muscle, Skeletal, Cross-Over Studies, Young Adult

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