Maximal lactate steady state, respiratory compensation threshold and critical power

Dekerle, J., Baron, B., Dupont, L., Vanvelcenaher, J. and Pelayo, P. (2003) Maximal lactate steady state, respiratory compensation threshold and critical power European Journal of Applied Physiology, 89 (3-4). pp. 281-288.

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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·minm1) to determine maximal oxygen uptake (V£O2max), maximal aerobic power (MAP) and the first and second ventilatory thresholds (VT1 and VT2) associated with break points in minute ventilation (V£E), carbon dioxide production (V£CO2), V£E/V£CO2 and V£E/V£O2 relationships. Exhaustion tests at 90%, 95%, 100% and 110% of V£O2max and several 30-min constant work rates were performed in order to determine CP and MLSS, respectively. MAP and V£O2max values were 344 (29) W and 53.4 (3.7) ml·minm1·kgm1, respectively. CP [278 (22) W; 85.4 (4.8)% V£O2max] and VT2 power output [286 (28) W; 85.3 (5.6)% V£O2max] 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)% V£O2max] and VT1 power output [159 (23) W; 52.9 (6.9)% V£O2max]. 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)% V£O2max which was significantly higher than VT1 [+21.4 (5.6)% V£O2max; p<0.01]. CP calculated from a given range of exhaustion times does not correspond to MLSS.

Item Type: Journal article
Subjects: B000 Health Professions > B100 Anatomy Physiology and Pathology > B120 Physiology
DOI (a stable link to the resource): 10.1007/s00421-002-0786-y
Faculties: Faculty of Education and Sport > Chelsea School
Depositing User: Chelsea editor
Date Deposited: 12 Oct 2007
Last Modified: 21 Jun 2013 12:14
URI: http://eprints.brighton.ac.uk/id/eprint/1524

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