Details

Autor(en) / Beteiligte

• Vinetti, Giovanni
• Taboni, Anna
• Bruseghini, Paolo
• Camelio, Stefano
• D’Elia, Matteo
• Fagoni, Nazzareno
• Moia, Christian
• Ferretti, Guido

Titel

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

Ist Teil von

• European journal of applied physiology, 2019-04, Vol.119 (4), p.941-949

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2019

Quelle

SpringerLink

Beschreibungen/Notizen

• Purpose The three-parameter model of critical power (3-p) implies that in the severe exercise intensity domain time to exhaustion ( T lim ) decreases hyperbolically with power output starting from the power asymptote (critical power, ẇ cr ) and reaching 0 s at a finite power limit ( ẇ 0 ) thanks to a negative time asymptote ( k ). We aimed to validate 3-p for short T lim and to test the hypothesis that ẇ 0 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 T lim 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 T lim ranged from 26 ± 4 s to 15.7 ± 4.9 min. In 3-p, with respect to 2-p, ẇ cr 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 ẇ 0 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 ẇ cr up to T lim as short as 20 s. However, since there is a discrepancy between estimated ẇ 0 and measured maximal instantaneous power, a modification of the model has been proposed.