Cited by 91Muscle metabolism and nutritionMuscle Physiology and DisordersNutrition and Health in Aging

Pronounced energy restriction with elevated protein intake results in no change in proteolysis and reductions in skeletal muscle protein synthesis that are mitigated by resistance exercise

Hector, Amy J., McGlory, Chris, Damas, Felipe, Mazara, Nicole, Baker, Steven K., Phillips, Stuart M.·2018·The FASEB Journal

Abstract

Preservation of lean body mass (LBM) may be important during dietary energy restriction (ER) and requires equal rates of muscle protein synthesis (MPS) and muscle protein breakdown (MPB). Currently, the relative contribution of MPS and MPB to the loss of LBM during ER in humans is unknown. We aimed to determine the impact of dietary protein intake and resistance exercise on MPS and MPB during a controlled short‐term energy deficit. Adult men (body mass index, 28.6 ± 0.6 kg/m 2 ; age 22 ± 1 yr) underwent 10 d of 40%‐reduced energy intake while performing unilateral resistance exercise and consuming lower protein (1.2 g/kg/d, n = 12) or higher protein (2.4 g/kg/d, n = 12). Pre‐ and postintervention testing included dual‐energy X‐ray absorptiometry, primed constant infusion of ring ‐[ 13 C 6 ]phenylalanine, and 15 [N]phenylalanine to measure acute postabsorptive MPS and MPB; D 2 O to measure integrated MPS; and gene and protein expression. There was a decrease in acute MPS after ER (higher protein, 0.059 ± 0.006 to 0.051 ± 0.009%/h; lower protein, 0.061 ± 0.005 to 0.045 ± 0.006%/h; P < 0.05) that was attenuated with resistance exercise (higher protein, 0.067 ± 0.01%/h; lower protein, 0.061 ± 0.006%/h), and integrated MPS followed a similar pattern. There was no change in MPB (energy balance, 0.080 ± 0.01%/hr; ER rested legs, 0.078 ± 0.008%/hr; ER exercised legs, 0.079 ± 0.006%/hr). We conclude that a reduction in MPS is the main mechanism that underpins LBM loss early in ER in adult men.—Hector, A. J., McGlory, C., Damas, F., Mazara, N., Baker, S. K., Phillips, S. M. Pronounced energy restriction with elevated protein intake results in no change in proteolysis and reductions in skeletal muscle protein synthesis that are mitigated by resistance exercise. FASEB J. 32, 265‐275 (2018). www.fasebj.org

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Crossref · 10.1096/fj.201700158rr

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Authors
Hector, A. J., McGlory, C., Damas, F., Mazara, N., Baker, S. K., & Phillips, S. M.
Affiliations
  • McMaster University (CA)
  • Universidade de São Paulo (BR)
Corresponding author
Phillips, Stuart M.
Venue
The FASEB Journal
Publisher
Wiley
Published
2017-09-12
Volume
32
Issue
1
Pages
265-275
ISSN
  • 0892-6638 (ISSN-L)
  • 1530-6860
OpenAlex
W2756325874
Cited by
91
References
35
Citations by year
2026: 6 · 2025: 8 · 2024: 9 · 2023: 11 · 2022: 8 · 2021: 10 · 2020: 13 · 2019: 14 · 2018: 11
FWCI
5.55
Type
journal article
Language
en
Open access
closed
Locations
  • The FASEB Journal (publishedVersion)
  • PubMed (publishedVersion)
Funders
Canada Research Chairs
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 › Physiology › Nutrition and Health in Aging
Keywords
caloric restriction, protein intake, muscle protein synthesis, muscle protein degradation, resistance training, lean mass loss, skeletal muscle, protein degradation, negative energy balance, phenylalanine tracer, muscle gene expression, weight loss, sarcopenia prevention, muscle hypertrophy, muscle atrophy, muscle fiber number
MeSH terms
Diet, High-Protein, Adolescent, Adult, Diet, Reducing, Humans, Male, Muscle Proteins, Weight Loss, Exercise, Body Mass Index, Muscle, Skeletal, Caloric Restriction, Resistance Training, Young Adult, Proteolysis

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