A comparison of lactate indices during ramp exercise using modelling techniques and conventional methods
Deutscher übersetzter Titel: | Ein Vergleich der Laktatindizes während einer Stufenbelastung unter Verwendung von Modellierungstechniken und konventioneller Methoden |
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Autor: | Thomas, Vincent; Costes, Frédéric; Chatagnon, Michel; Pouilly, Jean-Pierre; Busso, Thierry |
Erschienen in: | Journal of sports sciences |
Veröffentlicht: | 26 (2008), 13, S. 1387-1395, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Elektronische Ressource (online) Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0264-0414, 1466-447X |
DOI: | 10.1080/02640410802104920 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201502001085 |
Quelle: | BISp |
Abstract
The aim of this study was to compare the lactate indices provided by single- and double-breakpoint models with lactate thresholds obtained with conventional methods. Arterial samples for the determination of lactate concentrations were drawn from eight participants at rest and every minute during a ramp test (15 W • min−1) on a cycle ergometer. Lactate thresholds were determined from a blood lactate concentration equal to 4 mM (LT4), from an increase of 1 mM above the resting level (Δ1 mM), and from indirect methods using ventilatory parameters. Other indices were computed from the modelling of the lactate curve using an exponential function (LSI), a polynomial function (Dmax), a semi-log model (SLog), a parabola plus delay model (Mod P), and a two-breakpoint model (Mod M). Mod P and Mod M showed poor agreement with the other methods. LT4, Dmax, LSI, and respiratory exchange ratio equal to 1 were correlated with each other (0.81 ≤ R ≤ 0.92) and their mean differences ranged from 2.8 to 15 W, with limits of agreement within the range ± 24.6 to ± 42.4 W. These results question the interest in breakpoints models to detect lactate thresholds, knowing that LT4, LSI, Dmax, and respiratory exchange ratio equal to 1 provide indices that occur at similar power outputs. Verf.-Referat