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Relationship between training status and maximal fat oxidation rate.

Adriano E Lima-Silva, Romulo C M Bertuzzi, Flavio O Pires

    Journal of Sports Science & Medicine
    |October 24, 2013
    PubMed
    Summary

    Maximal fat oxidation rate (Fatmax) in runners is similar between moderate and low performers when categorized by 10,000m time. However, performance grouping by VO2max reveals differences, suggesting categorization criteria impact Fatmax findings.

    Keywords:
    fat oxidationindirect calorimetryrunning performance

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    Area of Science:

    • Exercise Physiology
    • Sports Science
    • Metabolic Research

    Background:

    • Maximal fat oxidation rate (Fatmax) is a key metabolic parameter in endurance athletes.
    • Understanding factors influencing Fatmax is crucial for optimizing training and performance.
    • Previous research has not consistently defined how training status affects Fatmax parameters.

    Purpose of the Study:

    • To compare maximal fat oxidation rate (Fatmax) and its intensity between moderate and low-performance runners.
    • To investigate the influence of different performance categorization criteria (10,000m time vs. VO2max) on Fatmax parameters.
    • To determine the association between running performance and fat oxidation capacity.

    Main Methods:

    • Eighteen runners completed an incremental treadmill test for gas analysis to determine Fatmax.
    • A 10,000-meter track run was performed to assess running performance.
    • Participants were divided into low and moderate performance groups based on 10,000m time and VO2max values.

    Main Results:

    • When grouped by 10,000m time, no significant differences in Fatmax or its intensity were found between moderate and low-performance groups.
    • When grouped by VO2max, the low VO2max group exhibited a significantly lower Fatmax compared to the high VO2max group.
    • 10,000m running performance was not associated with Fatmax or the intensity eliciting Fatmax, but was associated with %VO2max during the run.

    Conclusions:

    • The criteria used to define aerobic training status significantly influence the observed differences in maximal fat oxidation rate (Fatmax).
    • Fatmax appears similar between runners with comparable 10,000m race times.
    • Superior 10,000m running performance may be linked to a greater capacity for carbohydrate oxidation rather than fat oxidation.