Cited by 185Cardiovascular and exercise physiologyMitochondrial Function and PathologyExercise and Physiological Responses

Rate of oxidative phosphorylation in isolated mitochondria from human skeletal muscle: effect of training status

TONKONOGI, M., SAHLIN, K.·1997·Acta Physiologica Scandinavica

Abstract

Muscle oxidative function has been investigated in subjects with various training status (VO2 max, 41-72 mL O2 kg-1 body wt min-1, n = 10). Mitochondria were isolated from biopsies taken from m. vastus lateralis. Maximal mitochondrial oxygen consumption (QO2) and ATP production (MAPR) were measured with polarographic and bioluminometric techniques, respectively. The yield of mitochondria, calculated from the fractional activity of citrate synthase (CS), averaged 26%. With pyruvate + malate, the respiratory control ratio was 5.7 +/- 0.4 (X +/- SE) and the P/O ratio was 2.83 +/- 0.02, which demonstrates that the isolated mitochondria were functionally intact. QO2 was significantly correlated to aerobic training status expressed as muscle CS activity (r = 0.86), VO2 max (r = 0.84) and lactate threshold (r = 0.83) but not to the fibre type composition. A highly significant correlation (r = 0.93) was observed between ATP production calculated from QO2 and MAPR, but ATP production derived from QO2 was higher than MAPR both for pyruvate + malate (255%) and for alpha-ketoglutarate (23%). QO2 extrapolated to a temperature of 38 degrees C averaged 68 mL O2 min-1 kg-1 wet wt, which is similar to previous findings in vitro and in vivo during the post-exercise period. However, calculated muscle O2 utilization during exercise was three- to fivefold higher than QO2 measured on isolated mitochondria. It is suggested that additional factors exist for activation of mitochondrial respiration during exercise. It is concluded that muscle oxidative function can be quantitatively assessed from the respiration of mitochondria isolated from needle biopsy specimens and that QO2 is closely correlated to whole-body VO2 max.

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Crossref · 10.1046/j.1365-201x.1997.00222.x

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  • The demonstration of impaired OXPHOS capacity at relatively low ex vivo flux rates emphasizes the potential importance of the finding, since in vivo flux rates are higher.

    “The fact that we were able to demonstrate this impairment in OXPHOS capacity (complex I and II substrates combined) in the patients even at these relatively low flux rates, emphasizes the potential of our finding (in vivo flux rates are much higher than these ex vivo flux rates [38]).”

    From Simvastatin Effects on Skeletal Muscle (2013) · cites this paper as [38]

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Authors
TONKONOGI, M., & SAHLIN, K.
Affiliations
Karolinska Institutet (SE)
Corresponding author
SAHLIN, K.
Venue
Acta Physiologica Scandinavica
Publisher
Wiley
Published
1997-10
Volume
161
Issue
3
Pages
345-353
ISSN
  • 0001-6772 (ISSN-L)
  • 1365-201X
OpenAlex
W2146665077
Cited by
184
References
0
Citations by year
2026: 4 · 2025: 4 · 2024: 2 · 2023: 7 · 2022: 4 · 2021: 11 · 2020: 1 · 2019: 5 · 2018: 5 · 2017: 2 · 2016: 4 · 2015: 12 · 2014: 5 · 2013: 9 · 2012: 9
FWCI
7.31
Type
journal article
Language
en
Open access
closed
Locations
  • Acta Physiologica Scandinavica (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
Keywords
oxidative phosphorylation, skeletal muscle mitochondria, mitochondrial oxygen consumption, ATP production, citrate synthase, respiratory control ratio, P/O ratio, vastus lateralis, VO2max, lactate threshold, muscle fiber composition
MeSH terms
Adenosine Triphosphate, Adult, Aerobiosis, Citrate (si)-Synthase, Humans, Luminescent Measurements, Male, Mitochondria, Muscle, Oxidative Phosphorylation, Oxygen Consumption, Physical Fitness, Muscle, Skeletal, Muscle Fibers, Skeletal

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