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Fat Utilization During High-Intensity Exercise: When Does It End?

Ratko Peric1, Marco Meucci2, Zoran Nikolovski3

  • 1Institute for Sport and Occupational Medicine Banja Luka, Zdrave Korde 4, 78000, Banja Luka, Bosnia and Herzegovina. ratkoperic@yahoo.com.

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PubMed
Summary
This summary is machine-generated.

High-intensity exercise reveals a strong link between the anaerobic threshold (AnT) and the fat oxidation minimum point (FATmin). This finding holds true for both athletes and non-athletes, indicating consistent physiological responses during strenuous activity.

Keywords:
Anaerobic thresholdFatHigh intensityOxidationRunning

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Metabolic Research

Background:

  • Investigates substrate oxidation during high-intensity exercise.
  • Aims to identify the point at which fat oxidation ceases (FATmin).
  • Hypothesizes a relationship between the anaerobic threshold (AnT) and FATmin.

Purpose of the Study:

  • To determine the relationship between the anaerobic threshold (AnT) and the minimal fat oxidation point (FATmin).
  • To examine substrate oxidation patterns in athletes (ATL) and non-athletes (NATL) during high-intensity exercise.

Main Methods:

  • Utilized indirect calorimetry via breath-by-breath analysis during graded treadmill tests.
  • Measured maximal oxygen uptake (VO2max) and substrate oxidation rates in 47 males (30 ATL, 17 NATL).
  • Employed Pearson correlation coefficient (r) and effect size (R²) to analyze the correlation between VO2 at AnT and FATmin.

Main Results:

  • VO2max was significantly higher in ATL (56.17 ± 4.95 ml·kg−1·min−1) compared to NATL (46.04 ± 3.25 ml·kg−1·min−1).
  • AnT and FATmin occurred at similar percentages of VO2max in both groups: ATL (87.57% vs. 87.60%) and NATL (84.64% vs. 85.25%).
  • Demonstrated strong positive correlations between VO2 at AnT and VO2 at FATmin for both ATL (r=0.99) and NATL (r=0.97).

Conclusions:

  • Confirms a significant correlation between AnT and FATmin in both athletes and non-athletes.
  • Suggests consistent substrate oxidation rates at the anaerobic threshold across different fitness levels.
  • Provides valuable insights into metabolic responses during high-intensity exercise.