Validity of the two-parameter model in estimating the anaerobic work capacity

Jeanne Dekerle, Gary Brickley, A.J.P. Hammond, J. Pringle, Helen Carter

Research output: Contribution to journalArticlepeer-review


The curvature of the power–time (P–t) relationship (W′) has been suggested to be constant when exercising above critical power (CP) and to represent the anaerobic work capacity (AWC). The aim of this study was to compare W′ to (1) the total amount of work performed above CP (W 90s′) and (2) the AWC, both determined from a 90s all-out fixed cadence test. Fourteen participants (age 30.5±6.5 years; body mass 67.8±10.3 kg), following an incremental VO2max ramp protocol, performed three constant load exhaustion tests set at 103±3, 97±3 and 90±2% P-VO2max to calculate W′ from the P–t relationship. Two 90s all-out efforts were also undertaken to determine W 90s′ (power output—time integral above CP) and AWC (power output—time integral above the power output expected from the measured VO2). W′ (13.6±1.3 kJ) and W 90s′ (13.9±1.1 kJ; P=0.96) were not significantly different but were lower than AWC (15.9±1.2 kJ) by 24% (P=0.03) and 17%, respectively (P=0.04). All these variables were correlated (P<0.001) but great extents of disagreement were reported (0.2±6.4 kJ between W′ and W 90s′, 2.3±7.2 kJ between W′ and AWC, and 2.1±4.3 kJ between W 90s′ and AWC). The underestimation of AWC from both W′ and W 90s′ can be explained by the aerobic inertia not taking into consideration when determining the two latter variables. The low extents of agreement between W′, W 90s′ and AWC mean the terms should not be used interchangeably.
Original languageEnglish
Pages (from-to)257-264
Number of pages8
JournalEuropean Journal of Applied Physiology
Issue number3
Publication statusPublished - Feb 2006


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