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Title

Experimental validation of the 3-parameter critical power model in cycling

Authors
Vinetti, Giovanni
Bruseghini, Paolo
Camelio, Stefano
D’Elia, Matteo
Fagoni, Nazzareno
Published in European Journal of Applied Physiology. 2019, vol. 119, no. 4, p. 941-949
Abstract Purpose: The three-parameter model of critical power (3-p) implies that in the severe exercise intensity domain time to exhaustion (Tlim) decreases hyperbolically with power output starting from the power asymptote (critical power, ẇcr) and reaching 0 s at a finite power limit (ẇ0) thanks to a negative time asymptote (k). We aimed to validate 3-p for short Tlim and to test the hypothesis that ẇ0 represents the maximal instantaneous muscular power. Methods: Ten subjects performed an incremental test and nine constant-power trials to exhaustion on an electronically braked cycle ergometer. All trials were fitted to 3-p by means of non-linear regression, and those with Tlim greater than 2 min also to the 2-parameter model (2-p), obtained constraining k to 0 s. Five vertical squat jumps on a force platform were also performed to determine the single-leg (i.e., halved) maximal instantaneous power. Results: Tlim ranged from 26 ± 4 s to 15.7 ± 4.9 min. In 3-p, with respect to 2-p, ẇcr was identical (177 ± 26 W), while curvature constant W' was higher (17.0 ± 4.3 vs 15.9 ± 4.2 kJ, p < 0.01). 3-p-derived ẇ0 was lower than single-leg maximal instantaneous power (1184 ± 265 vs 1554 ± 235 W, p < 0.01). Conclusions: 3-p is a good descriptor of the work capacity above ẇcr up to Tlim as short as 20 s. However, since there is a discrepancy between estimated ẇ0 and measured maximal instantaneous power, a modification of the model has been proposed.
Keywords Anaerobic alactic metabolismEnduranceHyperbolic modelNon-linear modelPhysical work capacityPower–time relationship.
Identifiers
PMID: 30694386
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Other version: http://link.springer.com/10.1007/s00421-019-04083-z
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Research group Métabolisme énergétique (642)
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VINETTI, Giovanni et al. Experimental validation of the 3-parameter critical power model in cycling. In: European Journal of Applied Physiology, 2019, vol. 119, n° 4, p. 941-949. doi: 10.1007/s00421-019-04083-z https://archive-ouverte.unige.ch/unige:131214

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Deposited on : 2020-02-24

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