Slowing the Reconstitution of W′ in Recovery With Repeated Bouts of Maximal Exercise

in International Journal of Sports Physiology and Performance
Alan Chorley, Richard P. Bott, Simon Marwood and Kevin L. Lamb
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DOI:
https://doi.org/10.1123/ijspp.2018-0256
Keywords:
critical power; modeling; testing; fatigue
In Print:
Volume 14: Issue 2
Pages:
149–155
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Purpose: This study examined the partial reconstitution of the work capacity above critical power (W′) following successive bouts of maximal exercise using a new repeated ramp test, against which the fit of an existing W′ balance (Wbal′) prediction model was tested. Methods: Twenty active adults, consisting of trained cyclists (n = 9; age 43 [15] y, V˙O2max 61.9 [8.5] mL·kg−1·min−1) and untrained cyclists (n = 11; age 36 [15] y, V˙O2max 52.4 [5.8] mL·kg−1·min−1) performed 2 tests 2 to 4 d apart, consisting of 3 incremental ramps (20 W·min−1) to exhaustion interspersed with 2-min recoveries. Results: Intratrial differences between recoveries demonstrated significant reductions in the amount of W′ reconstituted for the group and both subsets (P < .05). The observed minimal detectable changes of 475 J (first recovery) and 368 J (second recovery) can be used to monitor changes in the rate of W′ reconstitution in individual trained cyclists. Intertrial relative reliability of W′ reconstitution was evaluated by intraclass correlation coefficients for the group (≥.859) and the trained (≥.940) and untrained (≥.768) subsets. Absolute reliability was evaluated with typical error (TE) and coefficient of variation (CV) for the group (TE ≤ 559 J, CV ≤ 9.2%), trained (TE ≤ 301 J, CV ≤ 4.7%), and untrained (TE ≤ 720 J, CV ≤ 12.4%). Conclusions: The reconstitution of W′ is subject to a fatiguing effect hitherto unaccounted for in Wbal′ prediction models. Furthermore, the Wbal′ model did not provide a good fit for the repeated ramp test, which itself proved to be a reliable test protocol.

Chorley, Bott, and Lamb are with the Dept of Sport and Exercise Sciences, University of Chester, Chester, United Kingdom. Marwood is with the School of Health Sciences, Liverpool Hope University, Liverpool, United Kingdom.

Chorley (a.chorley@chester.ac.uk) is corresponding author.

International Journal of Sports Physiology and Performance

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