Cited by 357Muscle Physiology and DisordersMuscle metabolism and nutritionCardiovascular and exercise physiology

Stimuli and sensors that initiate skeletal muscle hypertrophy following resistance exercise

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Wackerhage, Henning, Schoenfeld, Brad J., Hamilton, D. Lee, Lehti, Maarit, Hulmi, Juha J.·2019·Journal of Applied Physiology

Abstract

One of the most striking adaptations to exercise is the skeletal muscle hypertrophy that occurs in response to resistance exercise. A large body of work shows that a mammalian target of rapamycin complex 1 (mTORC1)-mediated increase of muscle protein synthesis is the key, but not sole, mechanism by which resistance exercise causes muscle hypertrophy. While much of the hypertrophy signaling cascade has been identified, the initiating, resistance exercise-induced and hypertrophy-stimulating stimuli have remained elusive. For the purpose of this review, we define an initiating, resistance exercise-induced and hypertrophy-stimulating signal as "hypertrophy stimulus," and the sensor of such a signal as "hypertrophy sensor." In this review we discuss our current knowledge of specific mechanical stimuli, damage/injury-associated and metabolic stress-associated triggers, as potential hypertrophy stimuli. Mechanical signals are the prime hypertrophy stimuli candidates, and a filamin-C-BAG3-dependent regulation of mTORC1, Hippo, and autophagy signaling is a plausible albeit still incompletely characterized hypertrophy sensor. Other candidate mechanosensing mechanisms are nuclear deformation-initiated signaling or several mechanisms related to costameres, which are the functional equivalents of focal adhesions in other cells. While exercise-induced muscle damage is probably not essential for hypertrophy, it is still unclear whether and how such muscle damage could augment a hypertrophic response. Interventions that combine blood flow restriction and especially low load resistance exercise suggest that resistance exercise-regulated metabolites could be hypertrophy stimuli, but this is based on indirect evidence and metabolite candidates are poorly characterized.

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Crossref · 10.1152/japplphysiol.00685.2018

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Authors
Wackerhage, H., Schoenfeld, B. J., Hamilton, D. L., Lehti, M., & Hulmi, J. J.
Affiliations
  • Technical University of Munich (DE)
  • Lehman College (US)
  • Deakin University (AU)
  • LIKES – Foundation for Sport and Health Sciences (FI)
  • University of Jyväskylä (FI)
Corresponding author
Wackerhage, Henning
Venue
Journal of Applied Physiology
Published
2019-01-01
Volume
126
Issue
1
Pages
30-43
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2897539462
Cited by
357
References
163
Citations by year
2026: 46 · 2025: 48 · 2024: 41 · 2023: 57 · 2022: 73 · 2021: 43 · 2020: 33 · 2019: 16
FWCI
2.25
Type
journal article
Language
en
Open access
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • Jyväskylä University Digital Archive (University of Jyväskylä) (submittedVersion)
  • Own your potential (DEAKIN) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
  • mediaTUM (Technical University of Munich) (submittedVersion, other-oa)
Funders
Foundation for Public Health and Physical Activity LIKES
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
Keywords
skeletal muscle hypertrophy, resistance training, mTORC1 signaling, muscle protein synthesis, mechanical stress, exercise-induced muscle damage, metabolic stress, mechanosensing, filamin C, BAG3, Hippo signaling pathway, autophagy, costameres, blood flow restriction, low-load resistance training
MeSH terms
Animals, Humans, Hypertrophy, Stress, Physiological, Weight-Bearing, Muscle, Skeletal, Mechanotransduction, Cellular, Resistance Training

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