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European Journal of Applied Physiology

Erschienen in:

01.05.2003 | Original Article

Maximal lactate steady state, respiratory compensation threshold and critical power

verfasst von: J. Dekerle, B. Baron, L. Dupont, J. Vanvelcenaher, P. Pelayo

Erschienen in: European Journal of Applied Physiology | Ausgabe 3-4/2003

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Abstract

Critical power (CP) and the second ventilatory threshold (VT₂) are presumed to indicate the power corresponding to maximal lactate steady state (MLSS). The aim of this study was to investigate the use of CP and VT₂ as indicators of MLSS. Eleven male trained subjects [mean (SD) age 23 (2.9) years] performed an incremental test (25 W·min⁻¹) to determine maximal oxygen uptake (V̇O_2max), maximal aerobic power (MAP) and the first and second ventilatory thresholds (VT₁ and VT₂) associated with break points in minute ventilation (V̇_E), carbon dioxide production (V̇CO₂), V̇_E/V̇CO₂ and V̇_E/V̇O₂relationships. Exhaustion tests at 90%, 95%, 100% and 110% of V̇O_2max and several 30-min constant work rates were performed in order to determine CP and MLSS, respectively. MAP and V̇O_2max values were 344 (29) W and 53.4 (3.7) ml·min⁻¹·kg⁻¹, respectively. CP [278 (22) W; 85.4 (4.8)% V̇O_2max] and VT₂ power output [286 (28) W; 85.3 (5.6)% V̇O_2max] were not significantly different (p=0.96) but were higher (p<0.05) than the MLSS work rate [239 (21) W; 74.3 (4.0)% V̇O_2max] and VT₁ power output [159 (23) W; 52.9 (6.9)% V̇O_2max]. MLSS work rate was significantly correlated (p<0.05) with those noted at VT₁ and VT₂ (r=0.74 and r=0.93, respectively). VT₂ overestimated MLSS by 10.9 (6.3)% V̇O_2max which was significantly higher than VT₁ [+21.4 (5.6)% V̇O_2max; p<0.01]. CP calculated from a given range of exhaustion times does not correspond to MLSS.

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Titel: Maximal lactate steady state, respiratory compensation threshold and critical power
verfasst von: J. Dekerle
B. Baron
L. Dupont
J. Vanvelcenaher
P. Pelayo
Publikationsdatum: 01.05.2003
Verlag: Springer-Verlag
Erschienen in: European Journal of Applied Physiology / Ausgabe 3-4/2003
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-002-0786-y

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