Ventilation and blood lactate increase exponentially during incremental exercise

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Deutscher übersetzter Titel:Ventilation und Blutlaktat erhoehen sich exponentiell bei ansteigender koerperlicher Belastung
Autor:Dennis, Steven C.; Noakes, Timothy D.; Bosch, Andrew N.
Erschienen in:Journal of sports sciences
Veröffentlicht:10 (1992), 5, S. 437-449, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource
Sprache:Englisch
ISSN:0264-0414, 1466-447X
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Erfassungsnummer:PU199210059988
Quelle:BISp

Abstract

This study examined whether the ventilatory (V) compensation for metabolic acidosis with increasing O2 uptake (VO2) and CO2 output (VCO2) might be more in accord with the theoretical expectation of a progressive acceleration of proton production from carbohydrate oxidation rather than a sudden onset of blood lactate <BLa> accumulation. The interrelationships between V, VO2, VCO2, and BLa concentration <BLa>, were investigated in 10 endurance-trained male cyclists during incremental (120+/-15 W min) exercise tests to exhaustion. Regression analysis on the V, VCO2 and <BLa> vs VO2 data revealed that all were better fitted by continuous Y=A.exp.(B.VO2)+C rate laws than by threshold linear rate equations (P<0.0001). Plots of V vs VCO2 and <BLa> were also non-linear. Ventilation increased as an exponential V=27+/-4.exp.(0.37+/-0.03.VCO2) function of VCO2 and as a hyperbolic function of <BLa>. In opposition to the anaerobic (lactate) threshold hypothesis, we suggest these data are more readily explained by a continuous development of acidosis, rather than a sudden onset of BLa accumulation, during progressive exercise. Verf.-Referat