Cited by 143Muscle metabolism and nutritionMuscle Physiology and DisordersSports Performance and Training

Sex-based comparisons of myofibrillar protein synthesis after resistance exercise in the fed state

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West, Daniel W. D., Burd, Nicholas A., Churchward-Venne, Tyler A., Camera, Donny M., Mitchell, Cameron J., Baker, Steven K., Hawley, John A., Coffey, Vernon G. +1 more·2012·Journal of Applied Physiology

Abstract

We made sex-based comparisons of rates of myofibrillar protein synthesis (MPS) and anabolic signaling after a single bout of high-intensity resistance exercise. Eight men (20 ± 10 yr, BMI = 24.3 ± 2.4) and eight women (22 ± 1.8 yr, BMI = 23.0 ± 1.9) underwent primed constant infusions of l-[ring-(13)C(6)]phenylalanine on consecutive days with serial muscle biopsies. Biopsies were taken from the vastus lateralis at rest and 1, 3, 5, 24, 26, and 28 h after exercise. Twenty-five grams of whey protein was ingested immediately and 26 h after exercise. We also measured exercise-induced serum testosterone because it is purported to contribute to increases in myofibrillar protein synthesis (MPS) postexercise and its absence has been hypothesized to attenuate adaptative responses to resistance exercise in women. The exercise-induced area under the testosterone curve was 45-fold greater in men than women in the early (1 h) recovery period following exercise (P < 0.001). MPS was elevated similarly in men and women (2.3- and 2.7-fold, respectively) 1-5 h postexercise and after protein ingestion following 24 h recovery. Phosphorylation of mTOR(Ser2448) was elevated to a greater extent in men than women acutely after exercise (P = 0.003), whereas increased phosphorylation of p70S6K1(Thr389) was not different between sexes. Androgen receptor content was greater in men (main effect for sex, P = 0.049). Atrogin-1 mRNA abundance was decreased after 5 h recovery in both men and women (P < 0.001), and MuRF-1 expression was elevated in men after protein ingestion following 24 h recovery (P = 0.003). These results demonstrate minor sex-based differences in signaling responses and no difference in the MPS response to resistance exercise in the fed state. Interestingly, our data demonstrate that exercise-induced increases in MPS are dissociated from postexercise testosteronemia and that stimulation of MPS occurs effectively with low systemic testosterone concentrations in women.

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Crossref · 10.1152/japplphysiol.00170.2012

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Authors
West, D. W. D., Burd, N. A., Churchward-Venne, T. A., Camera, D. M., Mitchell, C. J., Baker, S. K., Hawley, J. A., Coffey, V. G., & Phillips, S. M.
Affiliations
  • McMaster University (CA)
  • Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada;
  • RMIT University (AU)
Corresponding author
Phillips, Stuart M.
Venue
Journal of Applied Physiology
Published
2012-06-01
Volume
112
Issue
11
Pages
1805-1813
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2082919561
Cited by
143
References
56
Citations by year
2026: 6 · 2025: 13 · 2024: 16 · 2023: 14 · 2022: 12 · 2021: 10 · 2020: 7 · 2019: 11 · 2018: 11 · 2017: 10 · 2016: 8 · 2015: 8 · 2014: 9 · 2013: 5 · 2012: 3
FWCI
3.78
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • Research Bank (Australian Catholic University) (submittedVersion)
  • RMIT Research Repository (RMIT University Library) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
Funders
Canadian Institutes of Health Research
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 › Orthopedics and Sports Medicine › Sports Performance and Training
Keywords
myofibrillar protein synthesis, resistance training, sex differences, testosterone, mTOR signaling, p70S6K1, androgen receptor, atrogin-1, MuRF1, ubiquitin ligase, post-exercise recovery, anabolic signaling
MeSH terms
Whey Proteins, Dietary Proteins, Fasting, Female, Humans, Male, Milk Proteins, Muscle Proteins, Myofibrils, Sex Characteristics, Postprandial Period, Resistance Training, Young Adult

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