Reconstitution of W' in recovery slows with repeated bouts of maximal exercise

Chorley, Alan and Bott, Richard and Marwood, Simon and Lamb, Kevin (2018) Reconstitution of W' in recovery slows with repeated bouts of maximal exercise. International Journal of Sports Physiology and Performance. ISSN 1555-0265 (Accepted for Publication)

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Abstract

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 (RRT), against which the fit of an existing W’ balance (W’bal) prediction model was tested. Methods Twenty active adults, consisting of trained cyclists (n = 9; age 43 ± 15 years; V̇O2max 61.9 ± 8.5 mL∙kg∙min-1) and untrained (n = 11; age 36 ± 15 years; V̇O2max 52.4 ± 5.8 mL∙kg∙min-1) performed two tests 2-4 days apart, consisting of three incremental ramps (20 W∙min-1) to exhaustion interspersed with 2-min recoveries. Results Intra-trial differences between recoveries demonstrated significant reductions in the amount of W’ reconstituted for the group and both sub-sets (p < 0.05). 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. Inter-trial relative reliability of W’ reconstitution was evaluated by intraclass correlation coefficients for the group (≥ 0.859); trained (≥ 0.940) and untrained (≥ 0.768) sub-sets. 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 W’bal prediction models. Furthermore, the W’bal model did not provide a good fit for the RRT, which itself proved to be a reliable test protocol.

Item Type: Article
Additional Information and Comments: Article accepted for publication in the International Journal of Sports Physiology and Performance. Copyright Human Kinetics. Once published, the final version will be available online at: https://journals.humankinetics.com/loi/ijspp
Keywords: Critical Power; Modelling; Testing; fatigue, W'
Faculty / Department: Faculty of Science > School of Health Sciences
Depositing User: Simon Marwood
Date Deposited: 19 Jun 2018 13:57
Last Modified: 19 Jun 2018 13:57
URI: http://hira.hope.ac.uk/id/eprint/2548

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