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Different categories of VO2 kinetics in the ‘extreme’ exercise intensity domain

journal contribution
posted on 2024-03-04, 16:00 authored by Ozgur Ozkaya, Andrew M Jones, Mark BurnleyMark Burnley, Hakan As, Gorkem A Balci

The aim of this study was to classify potential sub-zones within the extreme exercise domain. Eight well-trained male cyclists participated in this study. The upper boundary of the severe exercise domain (Pupper-bound) was estimated by constant-work-rate tests. Then three further extreme-work-rate tests were performed in discrete regions within the extreme domain: extreme-1) at a work-rate greater than the Pupper-bound providing an 80–110-s time to task failure; extreme-2) a 30-s maximal sprint; and extreme-3) a 4-s maximal sprint. Different functions were used to describe the behaviour of the V˙O2V˙O2 kinetics over time. V˙O2V˙O2 on-kinetics during extreme-1 exercise was best described by a single-exponential model (R2 ≥ 0.97; SEE ≤ 0.10; p < 0.001), and recovery V˙O2V˙O2 decreased immediately after the termination of exercise. In contrast, V˙O2V˙O2 on-kinetics during extreme-2 exercise was best fitted by a linear function (R2 ≥ 0.96; SEE ≤ 0.16; p < 0.001), and V˙O2V˙O2 responses continued to increase during the first 10–20 s of recovery. During the extreme-3 exercise, V˙O2V˙O2 could not be modelled due to inadequate data, and there was an M-shape recovery V˙O2V˙O2 response with an exponential decay at the end. The V˙O2V˙O2 response to exercise across the extreme exercise domain has distinct features and must therefore be characterised with different fitting strategies in order to describe the responses accurately.

Funding

Scientific and Technological Research Council of Turkey [TUBITAK-1001 programme; project code: 222S130]

History

School

  • Sport, Exercise and Health Sciences

Published in

Journal of Sports Sciences

Volume

41

Issue

23

Pages

2144-2152

Publisher

Informa UK Limited, trading as Taylor & Francis Group

Version

  • AM (Accepted Manuscript)

Rights holder

© Informa UK Limited, trading as Taylor & Francis Group

Publisher statement

This is an Accepted Manuscript version of the following article, accepted for publication in Journal of Sports Sciences. Ozgur Ozkaya, Andrew M. Jones, Mark Burnley, Hakan As & Gorkem A. Balci (2023) Different categories of VO2 kinetics in the ‘extreme’ exercise intensity domain, Journal of Sports Sciences, 41:23, 2144-2152, DOI: 10.1080/02640414.2024.2316504. It is deposited under the terms of the Creative Commons Attribution-NonCommercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Acceptance date

2024-02-01

Publication date

2024-02-21

Copyright date

2024

ISSN

0264-0414

eISSN

1466-447X

Language

  • en

Depositor

Dr Mark Burnley. Deposit date: 1 March 2024

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