Cited by 74Muscle Physiology and DisordersSpaceflight effects on biologyNutrition and Health in Aging

Age-Related Deficit in Load-Induced Skeletal Muscle Growth

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Hwee, D. T., Bodine, S. C.·2009·The Journals of Gerontology Series A: Biological Sciences and Medical Sciences

Abstract

The growth response of ankle flexor and extensor muscles to two models of increased loading, functional overload (FO) and hind-limb reloading following hind-limb suspension, was measured by wet weight in Fisher 344-Brown Norway rats at ages ranging from 6 to 30 months. In response to FO, there was a 40% decrease in absolute growth of the plantaris beginning in middle age. Interestingly, the growth response to FO of 30-month old rats maintained on a 40% calorie-restricted diet improved by more than twofold relative to 30-month old rats on a normal chow diet. Recovery of muscle mass upon reloading following disuse was significantly impaired (reduced 7-16%) in predominantly fast, but not slow, muscles of 30-month relative to 9-month old rats. Initial investigation of the Akt signaling pathway following FO suggests a reduction or delay in activation of Akt and its downstream targets in response to increased loading in old rats.

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Authors
Hwee, D. T., & Bodine, S. C.
Affiliations
University of California, Davis (US)
Venue
The Journals of Gerontology Series A: Biological Sciences and Medical Sciences
Published
2009-04-07
Volume
64A
Issue
6
Pages
618-628
ISSN
  • 1079-5006 (ISSN-L)
  • 1758-535X
OpenAlex
W2116839423
Cited by
74
References
49
Citations by year
2025: 2 · 2024: 4 · 2023: 6 · 2022: 2 · 2021: 4 · 2020: 1 · 2019: 6 · 2018: 4 · 2017: 3 · 2016: 3 · 2015: 4 · 2014: 4 · 2013: 8 · 2012: 5
FWCI
3.08
Type
journal article
Language
en
Open access
Locations
  • The Journals of Gerontology Series A (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • Directorate for Biological Sciences
  • University of California, Davis
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK075801)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Physiology › Spaceflight effects on biology
  • Health Sciences › Medicine › Physiology › Nutrition and Health in Aging
Keywords
skeletal muscle hypertrophy, functional overload, hindlimb unloading, disuse atrophy, plantaris muscle, caloric restriction, fast-twitch muscle, Akt signaling, aging, rats
MeSH terms
Adaptation, Physiological, Age Factors, Aging, Animals, Hindlimb, Male, Muscle Proteins, Rats, Inbred F344, Signal Transduction, Weight-Bearing, Muscle, Skeletal, Hindlimb Suspension, Models, Animal, Muscle Development, Caloric Restriction, Proto-Oncogene Proteins c-akt, Rats

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