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Related Experiment Videos

Triglyceride/fatty acid cycling is increased after exercise.

R Bahr1, P Hansson, O M Sejersted

  • 1Department of Physiology, National Institute of Occupational Health, Oslo, Norway.

Metabolism: Clinical and Experimental
|September 1, 1990
PubMed
Summary

The triglyceride/fatty acid (TG/FA) substrate cycle significantly contributes to excess postexercise oxygen consumption (EPOC) after prolonged exercise. Increased TG/FA cycling may explain up to half of the delayed EPOC component, highlighting its metabolic importance.

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Area of Science:

  • Exercise Physiology
  • Metabolic Science
  • Biochemistry

Background:

  • Excess postexercise oxygen consumption (EPOC) represents a prolonged increase in O2 uptake after physical activity.
  • The triglyceride/fatty acid (TG/FA) substrate cycle involves the continuous breakdown and resynthesis of triglycerides.
  • Understanding the metabolic contributors to EPOC is crucial for optimizing recovery and training strategies.

Purpose of the Study:

  • To determine the relative contribution of the TG/FA substrate cycle to EPOC.
  • To quantify the energy cost associated with increased TG/FA cycling postexercise.

Main Methods:

  • Six healthy young men underwent 2 hours of exercise at 51% maximal O2 uptake.
  • Measurements included O2 uptake, respiratory exchange ratio, and urinary nitrogen excretion during a 3.5-hour recovery period.

Related Experiment Videos

  • Fatty acid (FA) mobilization was assessed via glycerol infusion, and TG/FA cycling was calculated from FA mobilization and oxidation rates.

    • Main Results:

    • Total EPOC was 7.82 +/- 1.51 L O2, a 15% increase over control.
    • Postexercise, FA oxidation increased by 43%, FA mobilization by 175%, and TG/FA cycling by 253% compared to control.
    • The energy cost of TG/FA cycling increased from 0.09 kJ/min (control) to 0.31 kJ/min (postexercise).

    Conclusions:

    • The elevated rate of TG/FA cycling postexercise significantly contributes to EPOC.
    • The energy expenditure from increased TG/FA cycling may account for up to 50% of the delayed component of EPOC.
    • This finding underscores the metabolic significance of substrate cycling in exercise recovery.