For a male Olympic champion (91 kg, VO2max 79 ml/kg/min, maximal anaerobic capacity, VLamax 0.55 mmol/l/min), VO2max and VLamax were estimated from the lactate-speed-distance data by randomly varying the lactate values first within the 0 - 5% range of error of the lactate meter (Lactate Pro2, Arkray) and then within the range of real physiological variation (5 - 10%). Reverse validation consisted of computing the lactate-speed-distance curves from the VO2max values within the 0 - 5% range of error of a K4b2 Cosmed portable analyzer, as established during a validation test-retest for 3-min trials, and then within the range of the real physiological variation (5 - 10%). For a random variation in measured lactate, VO2max and VLamax estimations were very similar. For a random variation in measured VO2, the parameters of the VO2tot speed equation were similar. For a random variation in measured VO2 max, the variations in estimated VO2 were 0.6 - 2%, with 5 - 11% for estimated VLamax and 5 - 20% for the lactate-speed curve. The potential measurement error for lactatemia had little effect on the calculated values but the potential measurement error for VO2 induced wide variability in VLamax and the estimated values of the lactate-speed curves. These results suggest the need for procedures to improve the accuracy of VO2 measures in swimming.
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