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Limit to steady-state aerobic power of skeletal muscles

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Abstract

Like any other kind of cell, muscle cells produce energy by oxidizing the fuel substrate that they absorb together with the needed oxygen from the surroundings. Oxidation occurs entirely within the cell. It means that the reactants and products of reaction must at some time be dissolved in the cell’s cytosol. If a cell operates at steady state, its cytosol composition remains constant. Therefore, the cytosol in a muscle that produces work at steady state must contain a constant amount of fuel, oxygen, and product of reaction dissolved in it. The greater the power produced, the higher the concentration of these solutes. There is a limit, however, to the maximum amount of solutes that the cytosol can contain without damaging the cell. General thermodynamic arguments, which are reviewed in this paper, help relate this limit to the dehydration and overhydration limits of the cell. The present analysis shows that the same limits entail a limit to the maximum power that a muscle can produce at steady state. This limit depends on the composition of the fuel mixture used by the muscle. The analysis also determines the number of fuel carbon atoms that must be oxidized in parallel within a cell to produce a given power. It may well happen that a muscle cannot reach the maximum attainable power because it cannot activate all the parallel oxidation paths that are needed to produce it. This may be due to a series of reasons ranging from health issues to a lack of training. The paper shows how the methods of indirect calorimetry can provide all the experimental data needed to determine the actual number of parallel oxidation paths that at steady state must be active in a muscle in a given exercise. A diagram relating muscle power to the number of parallel oxidation paths and fuel composition is finally presented. It provides a means to assess the power capacity of animal muscles and can be applied to evaluate their fitness, stamina, margins for improvement, and athletic potential.

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Acknowledgements

I wish to thank the Editor, Dr. Sonya Bahar, for her liberal attitude when handling the reviewing procedure of this paper, and the two unknown reviewers who took their time to read the original manuscript. Their constructive comments were most gratifying to me and enabled me to improve the paper in several important points.

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  1. Department of Mechanical, Chemical and Materials Engineering, University of Cagliari, 09123, Cagliari, Italy

    A. Paglietti

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Paglietti, A. Limit to steady-state aerobic power of skeletal muscles. J Biol Phys 44, 619–646 (2018). https://doi.org/10.1007/s10867-018-9510-y

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