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High Agreement between Laboratory and Field Estimates of Critical Power in Cycling.

Karsten, B., Jobson, Simon A., Hopker, James G., Jimenez, A., Beedie, C. (2014) High Agreement between Laboratory and Field Estimates of Critical Power in Cycling. International journal of sports medicine, 35 (4). pp. 298-303. ISSN 1439-3964. (doi:10.1055/s-0033-1349844) (KAR id:36028)


The purpose of this study was to investigate the level of agreement between laboratory-based estimates of critical power (CP) and results taken from a novel field test. Subjects were fourteen trained cyclists (age 40±7 yrs; body mass 70.2±6.5 kg; V?O2max 3.8±0.5 L · min-1). Laboratory-based CP was estimated from 3 constant work-rate tests at 80%, 100% and 105% of maximal aerobic power (MAP). Field-based CP was estimated from 3 all-out tests performed on an outdoor velodrome over fixed durations of 3, 7 and 12 min. Using the linear work limit (Wlim) vs. time limit (Tlim) relation for the estimation of CP1 values and the inverse time (1/t) vs. power (P) models for the estimation of CP2 values, field-based CP1 and CP2 values did not significantly differ from laboratory-based values (234±24.4 W vs. 234±25.5 W (CP1); P<0.001; limits of agreement [LOA], -10.98-10.8 W and 236±29.1 W vs. 235±24.1 W (CP2); P<0.001; [LOA], -13.88-17.3 W. Mean prediction errors for laboratory and field estimates were 2.2% (CP) and 27% (W'). Data suggest that employing all-out field tests lasting 3, 7 and 12 min has potential utility in the estimation of CP.

Item Type: Article
DOI/Identification number: 10.1055/s-0033-1349844
Uncontrolled keywords: critical intensity - exercise testing - power-duration relationship
Subjects: R Medicine > RC Internal medicine > RC1200 Sports medicine
Divisions: Divisions > Division of Natural Sciences > Sport and Exercise Sciences
Depositing User: James Hopker
Date Deposited: 05 Nov 2013 20:46 UTC
Last Modified: 08 Dec 2022 23:39 UTC
Resource URI: (The current URI for this page, for reference purposes)

University of Kent Author Information

Jobson, Simon A..

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Hopker, James G..

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