Maximal Fat Oxidation Rate and Cross-Over Point with Respect to Lactate Thresholds do not Have Good Agreement

Abstract

The present cross-sectional study was designed to assess the agreement between maximal fat oxidation rate (maxFAT_OXR) vs. Lactate Threshold (LT), and cross-over point (CO_P) vs. Individual Anaerobic Threshold (IAT) in well-trained athletes. 2 groups of male, well-trained endurance athletes (short-distance triathletes (ST) (n=11), and road cyclists (RC) (n=11)) performed a graded cycle ergometer test to exhaustion, with 4-min stages and 30-W increments. LT, IAT, maxFAT_OXR and CO_P were determined for each group. FAT_OXR and CHO_OXR were estimated by means of indirect calorimetry and stoichiometric equations. The agreement between maxFAT_OXR vs. LT, and CO_P vs. IAT were determined using the Bland-Altman methodology. In spite of the low systematic error (bias) (high accuracy) for CO_P vs. IAT, the variable error (limits of agreement) was moderate (moderate precision). For maxFAT_OXR vs. LT the systematic error was moderate (moderate accuracy), and the variable error was moderate to high (moderate to low precision). In conclusion, the data obtained from this study shows that maxFAT_OXR and CO_P do not exhibit good agreement with LT and IAT, in male endurance well-trained athletes. Consequently, it is not possible to assume that maxFAT_OXR vs. LT and CO_P vs. IAT occurs at the same exercise intensity.

Key words

stoichiometric equations - carbohydrates oxidation rate - fat oxidation rate - cross-over concept

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