Cited by 44Cardiovascular and exercise physiologyMuscle Physiology and DisordersMitochondrial Function and Pathology

On–off asymmetries in oxygen consumption kinetics of single Xenopus laevis skeletal muscle fibres suggest higher‐order control

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Wüst, Rob C.I., van der Laarse, Willem J., Rossiter, Harry B.·2013·The Journal of Physiology

Abstract

Key points Skeletal muscles increase oxygen consumption to produce energy during exercise; however, the processes controlling the rate of adaptation (its kinetics) at exercise onset and offset are not well understood. Here we measure kinetics in single frog skeletal muscle fibres using a unique experimental system that allows features of intracellular control mechanisms to be elucidated. We show for the first time that at contractions onset skeletal muscle kinetics are best described by a biphasic ‘activation’ and ‘exponential’ profile, whereas at cessation recovers with a single smooth exponential. Additionally these features were dependent on oxidative capacity and the intensity of stimulated contractions. These data show that the intracellular processes that activate oxidative energy provision at the onset of contractions are far more complex than previously suggested. Abstract The mechanisms controlling skeletal muscle oxygen consumption ( ) during exercise are not well understood. We determined whether first‐order control could explain kinetics at contractions onset ( ) and cessation ( ) in single skeletal muscle fibres differing in oxidative capacity, and across stimulation intensities up to .Xenopus laevisfibres (n= 21) were suspended in a sealed chamber with a fast response electrode to measure every second before, during and after stimulated isometric contractions. A first‐order model did not well characterise on‐transient kinetics. Including a time delay (TD) in the model provided a significantly improved characterisation than a first‐order fit without TD (F‐ratio;P <0.05), and revealed separate ‘activation’ and ‘exponential’ phases in 15/21 fibres contracting at (mean ± SD TD: 14 ± 3 s). On‐transient kinetics ( ) was weakly and linearly related to (R2= 0.271,P= 0.015). Off‐transient kinetics, however, were first‐order, and was greater in low‐oxidative ( < 0.05 nmol mm−3s−1) than high‐oxidative fibres ( > 0.10 nmol mm−3s−1; 170 ± 70vs. 29 ± 6 s,P< 0.001). was proportional to (R2= 0.727,P< 0.001), unlike in the on‐transient. The calculated oxygen deficit was larger (P< 0.05) than the post‐contraction volume of consumed oxygen at all intensities except . These data show a clear dissociation between the kinetic control of at the onset and cessation of contractions and across stimulation intensities. More complex models are therefore required to understand the activation of mitochondrial respiration in skeletal muscle at the start of exercise.

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Crossref · 10.1113/jphysiol.2012.241992

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  • Contraction-induced calcium uptake acutely increases OXPHOS and augments glucose transport and stimulates lipid uptake and oxidation through MEF2-induced expression of GLUT4 and PGC1α, respectively.

    “Contraction-induced calcium uptake acutely increases OXPHOS (94, 177) and augments glucose transport and stimulates lipid uptake and oxidation through MEF2-induced expression of GLUT4 and PGC1α, respectively.”

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  1. Wüst RCI, McDonald JR, Ferguson BS, Sun Y, Rogatzki MJ, Spires J, Kowalchuk JM, Gladden LB, Rossiter HB. Is there a time-delay in muscle oxygen uptake at the onset of contractions. Proc Physiol Soc. 2012;26 c16 and pc16. [Google Scholar]

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Authors
Wüst, R. C. I., van der Laarse, W. J., & Rossiter, H. B.
Affiliations
University of Leeds (GB)
Venue
The Journal of Physiology
Publisher
Wiley
Published
2013-01-14
Volume
591
Issue
3
Pages
731-744
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W1579448109
Cited by
44
References
57
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2023: 3 · 2022: 2 · 2021: 4 · 2020: 4 · 2019: 2 · 2018: 7 · 2017: 6 · 2016: 4 · 2015: 3 · 2014: 4 · 2013: 1
FWCI
6.24
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Amsterdam UMC (VU Amsterdam) - Institutional Repository (publishedVersion)
  • VU Research Portal (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
Funders
Biotechnology and Biological Sciences Research Council (BB/F019521/1)
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
exercise onset, exercise cessation, time delay, oxidative capacity, oxygen deficit, isometric contraction, stimulation intensity, exercise adaptation
MeSH terms
Animals, Female, Kinetics, Mitochondria, Muscle Contraction, Oxygen Consumption, Xenopus laevis, Muscle Fibers, Skeletal, In Vitro Techniques

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