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A dynamic model of the bi-exponential reconstitution and expenditure of W′ in trained cyclists
Chorley, Alan Marwood, Simon Lamb, Kevin L.
Chorley, Alan
Marwood, Simon
Lamb, Kevin L.
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2023-07-20
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Abstract
The aim of this study was to investigate the effects of different recovery power outputs on the reconstitution of W′ and to develop a dynamic bi-exponential model of W′ during depletion and reconstitution. Ten trained cyclists (mass 71.7 ± 8.4 kg; V̇O2max 60.0 ± 6.3 ml·kg-1·min-1) completed three incremental ramps (20 W·min-1) to the limit of tolerance on each of six occasions with recovery durations of 30 s and 240 s. Recovery power outputs varied between 50 W (LOW); 60% of critical power (CP) (MOD) and 85% of CP (HVY). W′ reconstitution was measured following each recovery and fitted to a bi-exponential model. Amplitude and time constant (τ) parameters were then determined via regression analysis accounting for relative intensity and duration to produce a dynamic model of W′. W′ reconstitution slowed disproportionately as recovery power output increased (p < 0.001) and increased with recovery duration (p < 0.001). The amplitudes of each recovery component were strongly correlated to W′ reconstitution after 240 s at HVY (r = 0.95), whilst τ parameters were found to be related to the fractional difference between recovery power and CP. The predictive capacity of the resultant model was assessed against experimental data with no differences found between predicted and experimental values of W′ reconstitution (p > 0.05). The dynamic bi-exponential model of W′ accounting for varying recovery intensities closely described W′ kinetics in trained cyclists facilitating real-time decisions about pacing and tactics during competition. The model can be customised for individuals from known CP and W′ and a single additional test session.
Citation
Chorley, A., Marwood, S., & Lamb, K. L. (2023). A dynamic model of the bi-exponential reconstitution and expenditure of W′ in trained cyclists. European Journal of Sport Science, 23(12), 2368-2378. https://doi.org/10.1080/17461391.2023.2238679
Publisher
Taylor & Francis
Journal
European Journal of Sport Science
Research Unit
DOI
10.1080/17461391.2023.2238679
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Article
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ISSN
1746-1391
EISSN
1536-7290