Bi-exponential modelling of W′ reconstitution kinetics in trained cyclists

Chorley, Alan and Bott, Richard and Marwood, Simon and Lamb, Kevin (2021) Bi-exponential modelling of W′ reconstitution kinetics in trained cyclists. European Journal of Applied Physiology, 122. pp. 677-689. ISSN 1439-6319

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Abstract

Purpose:
The aim of this study was to investigate the individual W′ reconstitution kinetics of trained cyclists following repeated bouts of incremental ramp exercise, and to determine an optimal mathematical model to describe W′ reconstitution.
Methods:
Ten trained cyclists (age 41±10 years; mass 73.4±9.9 kg; V̇O2max 58.6±7.1 mL∙kg∙min-1) completed three incremental ramps (20 W∙min-1) to the limit of tolerance with varying recovery durations (15-360 s) on 5-9 occasions. W′ reconstitution was measured following the first and second recovery periods against which mono-exponential and bi-exponential models were compared with adjusted R2 and Bias-corrected akaike information criterion (AICc).
Results:
A bi-exponential model outperformed the mono-exponential model of W′ reconstitution (AICc 30.2 versus 72.2), fitting group mean data well (adjR2=0.999) for the first recovery when optimised with parameters of fast component (FC) amplitude =50.67%; slow component (SC) amplitude =49.33%; time constant (τ)FC=21.5 s; τSC=388 s. Following the second recovery W′ reconstitution reduced by 9.1±7.3%, at 180 s and 8.2±9.8% at 240 s resulting in an increase in the modelled τSC to 716 s with τFC unchanged. Individual bi-exponential models also fit well (adjR2=0.978±0.017) with large individual parameter variations (FC amplitude 47.7±17.8%; first recovery: (τ)FC=22.0±11.8 s; (τ)SC=377±100 s; second recovery: (τ)FC=16.3.0±6.6 s; (τ)SC=549±226 s).
Conclusions:
W′ reconstitution kinetics were best described by a bi-exponential model consisting of distinct fast and slow phases. The amplitudes of the FC and SC remained unchanged with repeated bouts, with a slowing of W′ reconstitution confined to an increase in the time constant of the slow component.

Item Type:	Article
Additional Information and Comments:	The final publication is available from https://link.springer.com/article/10.1007/s00421-021-04874-3 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. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Keywords:	Critical Power, Recovery, W′, Modelling, Fatigue
Faculty / Department:	Faculty of Human and Digital Sciences > School of Health and Sport Sciences
Depositing User:	Simon Marwood
Date Deposited:	17 Dec 2021 12:06
Last Modified:	23 May 2022 09:01
URI:	https://hira.hope.ac.uk/id/eprint/3456

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