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Experimental validation of the 3-parameter critical power model in cycling.
- Source :
-
European Journal of Applied Physiology . Apr2019, Vol. 119 Issue 4, p941-949. 9p. 3 Charts, 4 Graphs. - Publication Year :
- 2019
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Abstract
- <bold>Purpose: </bold>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.<bold>Methods: </bold>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.<bold>Results: </bold>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).<bold>Conclusions: </bold>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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *EXAMPLE
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Details
- Language :
- English
- ISSN :
- 14396319
- Volume :
- 119
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- European Journal of Applied Physiology
- Publication Type :
- Academic Journal
- Accession number :
- 135412144
- Full Text :
- https://doi.org/10.1007/s00421-019-04083-z