Yong, S, Swisher, AR, Ferguson, C orcid.org/0000-0001-5235-1505 et al. (1 more author) (2019) Maximal Sustained Isokinetic Power at Exercise Intolerance is not Critical Power. International Journal of Sports Medicine, 40 (10). pp. 631-638. ISSN 0172-4622
Abstract
The asymptote of the hyperbolic power-duration relationship, critical power (CP), demarcates sustainable from non-sustainable exercise. CP is a salient parameter within the theoretical framework determining exercise tolerance. However, measuring CP is time consuming – typically 4 constant-power exercise tests to intolerance, or a 3-min all-out sprint is required.
To determine whether 30 s of maximal isokinetic cycling, immediately following the limit of tolerance, approximates CP.
Fifteen participants (7 women, 8 men, 23±5 yr, 71±12 kg, V̇O2peak 4.39±1.04 L·min−1; 61±9 mL·kg·min−1) completed 4 constant supra-CP exercise tests to intolerance. Each test was followed immediately by a 30 s maximal isokinetic effort at 80 rpm. Mean isokinetic power was compared to the known CP.
Mean±SD CP was 159±47 W (CI95 133, 185 W). Maximal isokinetic power immediately following intolerance was greater (p<0.05) than CP in all but one comparison (181±51 vs. 159±47 W; p>0.07). However, this closest estimation, following the longest duration constant-power test, resulted in 21 W of mean bias and wide limits of agreement (±84 W).
Isokinetic power measured immediately following intolerance consistently overestimated critical power. Thus, an adjunct of 30 s maximal isokinetic cycling immediately following the limit of tolerance does not approximate critical power.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © Georg Thieme Verlag KG Stuttgart. This is an author produced version of a paper published in International Journal of Sports Medicine. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | isokinetic; cycling; fatigue |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Biological Sciences (Leeds) > School of Biomedical Sciences (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 29 Aug 2019 14:09 |
Last Modified: | 31 Jul 2020 00:38 |
Status: | Published |
Publisher: | Georg Thieme Verlag |
Identification Number: | 10.1055/a-0946-1974 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:150143 |