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

The journal of physiological sciences

article

Sonia Conde Alonso¹  Trishan Gajanand²  Joyce S. Ramos⁴  Jean-Philippe Antonietti⁵  Fabio Borrani¹ 

[1] Institute of Sport Sciences, University of Lausanne;School of Human Movement and Nutrition Sciences, The University of Queensland;Department of Exercise Sciences, Faculty of Science, University of Auckland;SHAPE Research Centre, Exercise Science and Clinical Exercise Physiology, College of Nursing and Health Sciences, Flinders University;Institute of Psychology, University of Lausanne

关键词: Oxygen consumption kinetics;    Slow component;    Muscle fatigue;    Muscle fibers’ metabolic properties;   

DOI  :  10.1186/s12576-020-00754-1

来源: Springer

【 摘 要 】

To investigate the influence of different metabolic muscle fiber profiles on the emergence of the slow component of oxygen uptake ($${\dot{\text{V}}\text{O}}_{2}$$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 ($${\dot{\text{V}}\text{O}}_{2} {\text{baseline}}$$, time delay of primary phase, $${\dot{\text{V}}\text{O}}_{2}$$End and GainEnd) were not significantly different from one transition to severe exercise. These results suggest that the appearance of the $${\dot{\text{V}}\text{O}}_{2}$$SC is at least related to, if not the result of, the different metabolic properties of muscle fibers.

【 授权许可】

Unknown