The metabolic profiles of different fiber type populations under the emergence of the slow component of oxygen uptake

Sonia Conde Alonso; Trishan Gajanand; Joyce S. Ramos; Jean Philippe Antonietti; Fabio Borrani

doi:10.1186/s12576-020-00754-1

The metabolic profiles of different fiber type populations under the emergence of the slow component of oxygen uptake

Sonia Conde Alonso, Trishan Gajanand, Joyce S. Ramos, Jean Philippe Antonietti, Fabio Borrani

Sport, Health, Activity, Performance and Exercise Research Centre

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Abstract

To investigate the influence of different metabolic muscle fiber profiles on the emergence of the slow component of oxygen uptake (V &dot; O ₂_SC), 12 habitually active males completed four sessions of different combinations of work-to-work transition exercises up to severe intensity. Each transition was modeled to analyze the different kinetic parameters. Using a new approach, combining Henneman's principle and superposition principle, a reconstructed kinetics was built by temporally aligning the start of each new transition and summing them. The primary phase time constant significantly slowed and the gain at the end (GainEnd) significantly increased when transitions started from a higher intensity (p < 0.001). Kinetic parameters from the reconstructed curve (V &dot; O ₂ baseline, time delay of primary phase, V &dot; O ₂ End and GainEnd) were not significantly different from one transition to severe exercise. These results suggest that the appearance of the V &dot; O ₂_SC is at least related to, if not the result of, the different metabolic properties of muscle fibers.

Original language	English
Article number	27
Number of pages	8
Journal	Journal of Physiological Sciences
Volume	70
Issue number	1
DOIs	https://doi.org/10.1186/s12576-020-00754-1
Publication status	Published - 28 May 2020

Bibliographical note

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

Keywords

Muscle fatigue
Muscle fibers' metabolic properties
Oxygen consumption kinetics
Slow component

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title = "The metabolic profiles of different fiber type populations under the emergence of the slow component of oxygen uptake",

abstract = "To investigate the influence of different metabolic muscle fiber profiles on the emergence of the slow component of oxygen uptake (V &dot; O 2SC), 12 habitually active males completed four sessions of different combinations of work-to-work transition exercises up to severe intensity. Each transition was modeled to analyze the different kinetic parameters. Using a new approach, combining Henneman's principle and superposition principle, a reconstructed kinetics was built by temporally aligning the start of each new transition and summing them. The primary phase time constant significantly slowed and the gain at the end (GainEnd) significantly increased when transitions started from a higher intensity (p < 0.001). Kinetic parameters from the reconstructed curve (V &dot; O 2 baseline, time delay of primary phase, V &dot; O 2 End and GainEnd) were not significantly different from one transition to severe exercise. These results suggest that the appearance of the V &dot; O 2SC is at least related to, if not the result of, the different metabolic properties of muscle fibers.",

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N2 - To investigate the influence of different metabolic muscle fiber profiles on the emergence of the slow component of oxygen uptake (V &dot; O 2SC), 12 habitually active males completed four sessions of different combinations of work-to-work transition exercises up to severe intensity. Each transition was modeled to analyze the different kinetic parameters. Using a new approach, combining Henneman's principle and superposition principle, a reconstructed kinetics was built by temporally aligning the start of each new transition and summing them. The primary phase time constant significantly slowed and the gain at the end (GainEnd) significantly increased when transitions started from a higher intensity (p < 0.001). Kinetic parameters from the reconstructed curve (V &dot; O 2 baseline, time delay of primary phase, V &dot; O 2 End and GainEnd) were not significantly different from one transition to severe exercise. These results suggest that the appearance of the V &dot; O 2SC is at least related to, if not the result of, the different metabolic properties of muscle fibers.

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The metabolic profiles of different fiber type populations under the emergence of the slow component of oxygen uptake

Abstract

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Keywords

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