Life-long calorie restriction in Fischer 344 rats attenuates age-related loss in skeletal muscle-specific force and reduces extracellular space
Abstract
The decline in muscle function is associated with an age-related decrease in muscle mass and an age-related decline in strength. However, decreased strength is not solely due to decreased muscle mass. The age-related decline in muscle-specific force (force/muscle cross-sectional area), a measure of intrinsic muscle function, also contributes to age-related strength decline, and the mechanisms by which this occurs are only partially known. Moreover, changes in the extracellular space could have a profound effect on skeletal muscle function. Life-long calorie restriction in rodents has shown to be a powerful anti-aging intervention. In this study, we examine whether calorie restriction is able to attenuate the loss of muscle function and elevations in extracellular space associated with aging. We hypothesize that calorie restriction attenuates the age-associated decline in specific force and increases in extracellular space. Measurements of in vitro contractile properties of the extensor digitorum longus (type II) and soleus (type I) muscles from 12-mo and 26- to 28-mo-old ad libitum-fed, as well as 27- to 28-mo-old life-long calorie-restricted male Fischer 344 rats, were performed. We found that calorie restriction attenuated the age-associated decline in muscle mass-to-body mass ratio (mg/g) and strength-to-body mass ratio (N/kg) in the extensor digitorum longus muscle ( P < 0.05) but not in the soleus muscle ( P > 0.05). Importantly, muscle-specific force (N/cm 2) in the extensor digitorum longus, but not in the soleus muscle, of the old calorie-restricted rats was equal to that of the young 12-mo-old animals. Moreover, the age-associated increase in extracellular space was reduced in the fast-twitch extensor digitorum longus muscle ( P < 0.05) but not in the soleus muscle with calorie restriction. We also found a significant correlation between the extracellular space and the muscle-specific force in the extensor digitorum longus ( r = -0.58; P < 0.05) but not in the soleus muscle ( r = -0.38; P > 0.05). Hence, this study shows a loss of muscle function with age and suggests that long-term calorie restriction is an effective intervention against the loss of muscle function with age.
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Loss of muscle performance has a greater negative impact on older adults than loss of muscle mass.
“the preponderance of evidence from years indicates that loss of muscle performance has a greater negative impact on older adults than loss of mass [18, 20–25, 37–39].”
From Targeting Intramyocellular Lipids to Improve Aging Muscle Function (2025) · cites this paper as [24]
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- Authors
- Payne, A. M., Dodd, S. L., & Leeuwenburgh, C.
- Affiliations
- University of Florida (US)
- Venue
- Journal of Applied Physiology
- Publisher
- American Physiological Society
- Published
- 2003-12
- Volume
- 95
- Issue
- 6
- Pages
- 2554-2562
- ISSN
- 0161-7567 (ISSN-L)
- 8750-7587
- 1522-1601
- OpenAlex
- W2072670607
- Cited by
- 71
- References
- 64
- Citations by year
- 2026: 1 · 2025: 5 · 2024: 2 · 2021: 1 · 2019: 1 · 2018: 2 · 2017: 1 · 2016: 4 · 2015: 4 · 2014: 3 · 2013: 1 · 2012: 7
- FWCI
- 2.18
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Applied Physiology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute on Aging (AG17994, AG10485, R01AG017994, AG-21042, R01AG021042, P01AG010485)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
- Health Sciences › Medicine › Physiology › Nutrition and Health in Aging
- Keywords
- caloric restriction, aging, skeletal muscle, extracellular space, muscle strength, extensor digitorum longus, soleus muscle, fast-twitch muscle, anti-aging interventions, muscle function decline
- MeSH terms
- Aging, Animals, Body Weight, Electric Stimulation, Extracellular Space, Hindlimb, Male, Muscle Contraction, Organ Size, Rats, Inbred F344, Muscle, Skeletal, Caloric Restriction, Rats
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