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  • Title: Reproducibility of the blood lactate-running speed curve in horses under field conditions.
    Author: Guhl A, Lindner A, von Wittke P.
    Journal: Am J Vet Res; 1996 Jul; 57(7):1059-62. PubMed ID: 8807022.
    Abstract:
    OBJECTIVE: To examine the reproducibility of blood lactate-running speed curve parameters derived by a curve-fit equation and by linear interpolation from the results of 4-speed tests of sport horses under field conditions. DESIGN: Thoroughbreds completed 10 test pairs with 3 to 11 days between tests and retest. ANIMALS: 7 Thoroughbreds. PROCEDURE: The 4-speed test consisted of 4 runs over a distance of 2,110 m. Exercise intensity was increased by 1 m/s for each run. Blood lactate concentration measured after each run was plotted against running speed to determine the blood lactate-running speed relation. By means of the blood lactate-running speed relation, velocity inducing 2, 2.5, 3, 3.5, or 4 mM blood lactate concentration was calculated by a curve-fit equation and by linear interpolation. RESULTS: The test-retest correlation coefficient of velocity inducing 2, 2.5, 3, 3.5, and 4 mM blood lactate concentration determined by curve-fit equation was 0.67, 0.78, 0.84, 0.86, and 0.86, respectively, and by linear interpolation was 0.42, 0.58, 0.77, 0.87, and 0.78, respectively. But the test-retest regression was equal to the line of identity only for velocity inducing 3.5 and 4 mM blood lactate concentration. CONCLUSIONS: The reproducibility of velocity inducing 3.5 and 4 mM blood lactate concentration was sufficient to be used to compare horses and evaluate conditioning effects. This holds both methods of calculation of the parameters derived from the blood lactate-running speed relation.
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