Cited by 171Muscle Physiology and DisordersNutrition and Health in AgingMuscle metabolism and nutrition

Intramyocellular lipid and impaired myofiber contraction in normal weight and obese older adults

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Choi, Seung J., Files, D. Clark, Zhang, Tan, Wang, Zhong-Min, Messi, Maria L., Gregory, Heather, Stone, John, Lyles, Mary F. +4 more·2016·The Journals of Gerontology Series A: Biological Sciences and Medical Sciences

Abstract

BACKGROUND: Evidence implicates the amount and location of fat in aging-related loss of muscle function; however, whether intramyocellular lipids affect muscle contractile capacity is unknown. METHODS: We compared both in vivo knee extensor muscle strength, power, and quality and in vitro mechanical properties of vastus lateralis single-muscle fibers between normal weight (NW) and obese older adults and determined the relationship between muscle lipid content (both intramuscular adipose tissue and intramyocellular lipids) and in vivo and in vitro muscle function in NW and obese individuals. RESULTS: The obese group had a greater percentage of type-I fibers compared to the NW group. The cross-sectional area of type-I fibers was greater in obese compared to NW; however, maximal shortening velocity of type-I fibers in the obese was slower compared to NW. Type-I and type-IIa fibers from obese group produced lower specific force than that of type-I and type-IIa fibers from the NW group. Normalized power was also substantially lower (~50%) in type-I fibers from obese adults. The intramyocellular lipids data showed that total lipid droplet area, number of lipid droplets, and area fraction were about twofold greater in type-I fibers from the obese compared to the NW group. Interestingly, a significant inverse relationship between average number of lipid droplets and single-fiber unloaded shortening velocity, maximal velocity, and specific power was observed in obese participants. Additionally, muscle echointensity correlated with single-fiber specific force. CONCLUSIONS: These data indicate that greater intramyocellular lipids are associated with slower myofiber contraction, force, and power development in obese older adults.

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Crossref · 10.1093/gerona/glv169

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  • Studies have reported that obese adults have about 20% higher thigh muscle mass than those with normal weight.

    “Studies have reported that obese adults have about 20% higher thigh muscle mass than those with normal weight (85).”

    From Long-Term Effects of a Novel Continuous Remote Care Intervention Including Nutritional Ketosis for the Management of Type 2 Diabetes: A 2-Year Non-randomized Clinical Trial (2019) · cites this paper as [85]

    The Thigh Composition results (p. 2) report 19% greater thigh muscle volume in the obese group than in the normal-weight group, consistent with “about 20%.” The study measured volume, not thigh muscle mass, and its participants were older adults rather than adults generally (Table 2, p. 3). (LLM, conf=0.84)

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  • Obesity is associated with lower muscle quality (myosteatosis and muscle fibre composition), as evidenced by decreased muscle strength.

    “This could partly be explained by obesity being associated with lower muscle quality (myosteatosis and muscle fibre composition), as evidenced by decreased muscle strength”

    From Changes in lean body mass with <scp>glucagon‐like peptide</scp> ‐1‐based therapies and mitigation strategies (2024) · cites this paper as [7]

    The Morphological and Contractile Characteristics results (p. 3) report a different fiber-type composition in obese older adults, and the Discussion (p. 5) reports more intermuscular fat and lower knee-extensor torque relative to muscle volume. However, the obese group had higher absolute peak torque, so the claim of decreased muscle strength needs the qualification that strength was lower when normalized to muscle volume. (LLM, conf=0.87)

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Authors
Choi, S. J., Files, D. C., Zhang, T., Wang, Z.-M., Messi, M. L., Gregory, H., Stone, J., Lyles, M. F., Dhar, S., Marsh, A. P., Nicklas, B. J., & Delbono, O.
Affiliations
  • Kyungsung University (KR)
  • Wake Forest University Health Sciences (US)
  • Wake Forest University (US)
Venue
The Journals of Gerontology Series A: Biological Sciences and Medical Sciences
Published
2015-09-23
Volume
71
Issue
4
Pages
557-564
ISSN
  • 1079-5006 (ISSN-L)
  • 1758-535X
OpenAlex
W2307246836
Cited by
171
References
31
Citations by year
2026: 6 · 2025: 20 · 2024: 13 · 2023: 13 · 2022: 20 · 2021: 18 · 2020: 28 · 2019: 18 · 2018: 16 · 2017: 13 · 2016: 6
FWCI
5.07
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
  • National Institutes of Health
  • National Institute on Aging (AG 15820, R01AG020583, AG-13934, R01AG015820, P30AG-21332, P30AG021332, R01AG013934)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Physiology › Nutrition and Health in Aging
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
Keywords
intramyocellular lipid, obesity, aging, muscle strength, muscle power, lipid droplets, type I muscle fibers, vastus lateralis, muscle function, older adults
MeSH terms
Aged, Aged, 80 and over, Aging, Body Composition, Female, Humans, Lipids, Male, Muscle Contraction, Obesity, Muscle Fibers, Skeletal, Muscle Fibers, Fast-Twitch, Muscle Fibers, Slow-Twitch, Torque, Muscle Strength

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