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Related Experiment Videos

Maximal fat oxidation during exercise in trained men.

J Achten1, A E Jeukendrup

  • 1School of Sport and Exercise Sciences, University of Birmingham, Edgbaston, Birmingham, United Kingdom.

International Journal of Sports Medicine
|November 5, 2003
PubMed
Summary
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This study confirms a reliable protocol for measuring maximal fat oxidation (Fat(max)) during exercise. Even in trained individuals, significant differences in Fat(max) and optimal fat-burning intensity were observed.

Area of Science:

  • Exercise Physiology
  • Metabolic Adaptations
  • Sports Science

Background:

  • Fat oxidation follows a U-shaped curve in relation to exercise intensity.
  • A novel protocol exists to determine the exercise intensity eliciting maximal fat oxidation (Fat(max)).

Purpose of the Study:

  • To assess the reliability of a protocol for estimating Fat(max).
  • To determine Fat(max) in a cohort of endurance-trained individuals.

Main Methods:

  • Subjects underwent three graded exercise tests to exhaustion on a cycle ergometer.
  • Tests were conducted under standardized dietary and exercise conditions following an overnight fast.
  • Fat oxidation rates were measured at various exercise intensities.

Main Results:

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  • The protocol demonstrated good reliability for estimating Fat(max) and minimal fat oxidation (Fat(min)) with a coefficient of variation (CV) of 9.0-9.5%.
  • Maximal fat oxidation occurred at approximately 62.5% of VO2max, with minimal fat oxidation at 86.1% VO2max.
  • Significant inter-individual variability in Fat(max) and the rate of maximal fat oxidation was observed, even in a homogeneous group of trained athletes.

Conclusions:

  • The protocol for determining Fat(max) is reliable.
  • Endurance-trained individuals exhibit substantial inter-individual variation in their capacity for fat oxidation during exercise.
  • Optimal fat-burning intensity is around 63% VO2max, but individual responses vary widely.