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Anabolic signaling and protein synthesis in human skeletal muscle after dynamic shortening or lengthening exercise
Abstract
We hypothesized a differential activation of the anabolic signaling proteins protein kinase B (PKB) and p70 S6 kinase (p70S6K) and subsequent differential stimulation of human muscle protein synthesis (MPS) after dynamic shortening or lengthening exercise. Eight healthy men [25 ± 5 yr, BMI 26 ± 3 kg/m−2 (means ± SD)] were studied before and after 12 min of repeated stepping up to knee height, and down again, while carrying 25% of their body weight, i.e., shortening exercise with the “up” leg and lengthening exercise with contralateral “down” leg. Quadriceps biopsies were taken before and 3, 6, and 24 h after exercise. After exercise, over 2 h before the biopsies, the subjects ingested 500 ml of water containing 45 g of essential amino acids and 135 g of sucrose. Rates of muscle protein synthesis were determined via incorporation over time of [1-13C]leucine (≤6 h after exercise) or [1-13C]valine (21–24 h after exercise) and phosphorylation of signaling proteins by Western analysis. PKB and p70S6K phosphorylation increased ∼3-fold after 3 h and remained elevated at 6 and 24 h. After exercise, rates of myofibrillar and sarcoplasmic protein synthesis were unchanged over the period including exercise and 3 h of recovery but had increased significantly at 6 (∼3.0- and 2.4-fold, respectively) and 24 h (∼3.2- and 2.0-fold, respectively), independently of the mode of exercise. Short-term dynamic exercise in either shortening or lengthening mode increases MPS at least as much as resistance exercise and is associated with long-term activation of PKB and p70S6K.
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“Skeletal muscle protein synthesis signaling, via activation of the mTORC1 pathway, is stimulated in the range of 1–7 days post-damage in response to various eccentric or lengthening contraction protocols in rodents and humans (57–61).”
From Phytoecdysteroids Accelerate Recovery of Skeletal Muscle Function Following in vivo Eccentric Contraction-Induced Injury in Adult and Old Mice (2021) · cites this paper as [58]
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Metadata
- Authors
- Cuthbertson, D. J., Babraj, J., Smith, K., Wilkes, E., Fedele, M. J., Esser, K., & Rennie, M.
- Affiliations
- Ninewells Hospital (GB)
- University of Dundee (GB)
- University of Nottingham (GB)
- University of Illinois Urbana-Champaign (US)
- University of Kentucky (US)
- Venue
- American Journal of Physiology-Endocrinology and Metabolism
- Publisher
- American Physiological Society
- Published
- 2006-04
- Volume
- 290
- Issue
- 4
- Pages
- E731-E738
- ISSN
- 0193-1849 (ISSN-L)
- 1522-1555
- OpenAlex
- W2135780085
- Cited by
- 166
- References
- 42
- Citations by year
- 2026: 3 · 2025: 3 · 2024: 5 · 2023: 8 · 2022: 6 · 2021: 7 · 2020: 6 · 2019: 4 · 2018: 7 · 2017: 12 · 2016: 10 · 2015: 13 · 2014: 11 · 2013: 9 · 2012: 7
- FWCI
- 3.66
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- American Journal of Physiology-Endocrinology and Metabolism (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Wellcome Trust
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR 45617, R01AR049869, AR49869, R01AR045617)
- Topics
- Health Sciences › Nursing › Nutrition and Dietetics › Muscle metabolism and nutrition
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
- Health Sciences › Medicine › Physiology (medical) › Cardiovascular and exercise physiology
- Keywords
- muscle protein synthesis, anabolic signaling, Akt, p70 S6 kinase, dynamic exercise, quadriceps, myofibrillar protein synthesis, leucine incorporation, post-exercise recovery, resistance training
- MeSH terms
- Adult, Biopsy, Collagen, Humans, Leucine, Male, Muscle Proteins, Myofibrils, Phosphorylation, Random Allocation, Sarcoplasmic Reticulum, Valine, Blotting, Western, Signal Transduction, Exercise, Ribosomal Protein S6 Kinases, 70-kDa, Proto-Oncogene Proteins c-akt, Quadriceps Muscle
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