Relationship Between Exercise Training-Induced Changes in Oxygen Uptake Kinetics and the Power-Duration Relationship

Lei, Tze-Huan and vos, Luuk and Koga, Shunsaku and Marwood, Simon and Korzieniewski, Bernard and Goulding, Richie P (2026) Relationship Between Exercise Training-Induced Changes in Oxygen Uptake Kinetics and the Power-Duration Relationship. Medicine & Science in Sports & Exercise. ISSN 0195-9131 (Accepted for Publication)

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Abstract

Purpose: This study aimed to determine the relationships between training-induced changes in the variable values of the power-duration relationship (CP and W′) and those of pulmonary oxygen uptake (V̇O2) kinetics (the fundamental phase time constant; τVO2, and the slow component amplitude; V̇O2sc). Methods: Eleven healthy untrained males underwent 2 weeks of severe-intensity exercise training. Before and after training, V̇O2max was assessed via an incremental exercise test on a cycle ergometer, CP and W′ were assessed via constant power determination trials, and V̇O2 kinetics were assessed during exercise at a PO 10% above CP (post-training at the same absolute and relative intensity as pre-training). A previously described and validated computer model of the human skeletal muscle bioenergetic system was used to provide further insight into training-induced changes.
Results: CP and τVO2 were strongly inversely correlated before and after training, and their training-induced changes were also correlated. Computer simulations suggested that increased oxidative phosphorylation activity (kOX) was the main factor determining the training-induced changes in CP and τVO2. Exercise training increased W′ and reduced the amplitude of the V̇O2sc, however, the training-induced changes in W′ and the V̇O2sc were not correlated. Model simulations suggested that variations in kOX, the accessible phosphate (+creatine) pool (Pacc), and the peak inorganic phosphate (Pi) concentrations attained prior to task failure (Pipeak) could explain the observed training-induced alterations in W′ and the V̇O2sc. Conclusions: The present study suggests that the bioenergetic mechanisms underpinning CP and τVO2 are similar, whereas the relationship between W′ and the V̇O2sc appears somewhat more complex.

Item Type:	Article
Keywords:	OXYGEN UPTAKE KINETICS AND THE POWER-DURATION RELATIONSHIP
Faculty / Department:	Faculty of Human and Digital Sciences > School of Health and Sport Sciences
Depositing User:	Simon Marwood
Date Deposited:	22 Jun 2026 13:45
Last Modified:	22 Jun 2026 13:45
URI:	https://hira.hope.ac.uk/id/eprint/4937

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