Cited by 63Mitochondrial Function and PathologyCardiovascular and exercise physiologyAdipose Tissue and Metabolism

The influence of age and aerobic fitness: effects on mitochondrial respiration in skeletal muscle

Larsen, S., Hey‐Mogensen, M., Rabøl, R., Stride, N., Helge, J. W., Dela, F.·2012·Acta Physiologica

Abstract

Aim: Mitochondrial function has previously been studied in ageing, but never in humans matched for maximal oxygen uptake ( ). Furthermore, the influence of ageing on mitochondrial substrate sensitivity is not known. Methods: Skeletal muscle mitochondrial respiratory capacity and mitochondrial substrate sensitivity were measured by respirometry in young (23 ± 3 years) and middle‐aged (53 ± 3 years) male subjects with similar . Protocols for respirometry included titration of substrates for complex I (glutamate), complex II (succinate) and both (octanoyl carnitine) for calculation of substrate sensitivity ( C 50 ). Myosin heavy chain ( MHC ) isoforms, citrate synthase ( CS ) and β‐hydroxy‐acyl‐ C o A ‐dehydrogenase ( HAD ) activity, mitochondrial DNA (mt DNA ) content, protein levels of complexes I – V and antioxidant defence system [manganese superoxide dismutase ( M n SOD )] were measured. Results: No differences were found in maximal mitochondrial respiration or C 50 with glutamate (2.0 ± 0.3 and 1.8 ± 0.3 m m ), succinate (3.7 ± 0.2 and 3.8 ± 0.4 m m ) or octanoyl carnitine (47 ± 8 and 56 ± 7 μ m ) in young and middle‐aged subjects respectively. Normalizing mitochondrial respiration to mt DNA young subjects had a higher ( P < 0.05) respiratory capacity per mitochondrion compared to middle‐aged subjects. HAD activity and mt DNA per mg tissue were higher in middle‐aged compared to young subjects. Middle‐aged had a higher MHC I isoform and a lower MHC IIX isoform content compared to young subjects. Conclusion: Mitochondrial substrate sensitivity is not affected by ageing. When young and middle‐aged men are carefully matched for , mitochondrial respiratory capacity is also similar. However, per mitochondrion respiratory capacity was lower in middle‐aged compared to young subjects. Thus, when matched for , middle‐aged seem to require a higher mitochondrial content than young subjects.

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Crossref · 10.1111/j.1748-1716.2012.02408.x

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Authors
Larsen, S., Hey‐Mogensen, M., Rabøl, R., Stride, N., Helge, J. W., & Dela, F.
Affiliations
University of Copenhagen (DK)
Corresponding author
Hey‐Mogensen, M.
Venue
Acta Physiologica
Publisher
Wiley
Published
2012-02-11
Volume
205
Issue
3
Pages
423-432
ISSN
  • 1748-1708 (ISSN-L)
  • 1748-1716
OpenAlex
W2160465777
Cited by
63
References
36
Citations by year
2026: 1 · 2025: 1 · 2024: 7 · 2023: 3 · 2022: 1 · 2021: 6 · 2020: 3 · 2019: 4 · 2018: 7 · 2017: 4 · 2016: 7 · 2015: 4 · 2014: 7 · 2013: 1 · 2012: 7
FWCI
2.44
Type
journal article
Language
en
Open access
closed
Locations
  • Acta Physiologica (publishedVersion)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
Keywords
aging, cardiorespiratory fitness, mitochondrial respiration, skeletal muscle, VO2max, myosin heavy chain isoforms, citrate synthase, beta-hydroxyacyl-CoA dehydrogenase, mitochondrial DNA content, manganese superoxide dismutase
MeSH terms
Adult, Aging, Biopsy, DNA, Mitochondrial, Electron Transport, Humans, Male, Middle Aged, Mitochondria, Muscle, Oxygen Consumption, Physical Fitness, 3-Hydroxyacyl CoA Dehydrogenases, Exercise, Muscle, Skeletal, Myosin Heavy Chains

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