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Related Experiment Videos

Gender differences in substrate utilization during submaximal exercise in endurance-trained subjects.

Carsten Roepstorff1, Charlotte H Steffensen, Marianne Madsen

  • 1Department of Human Physiology, Copenhagen Muscle Research Centre, University of Copenhagen, DK-2100 Copenhagen, Denmark. croepstorff@ifi.ku.dk

American Journal of Physiology. Endocrinology and Metabolism
|January 15, 2002
PubMed
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Female athletes utilize more intracellular fat during exercise than males, though overall fuel use is similar. Males may use other fat sources, suggesting gender differences in lipid metabolism during endurance exercise.

Area of Science:

  • Exercise Physiology
  • Nutritional Biochemistry
  • Sports Science

Background:

  • Understanding gender-based differences in substrate utilization during exercise is crucial for optimizing athletic performance and nutrition strategies.
  • Endurance-trained males and females exhibit distinct physiological adaptations, potentially influencing fuel selection during physical activity.

Purpose of the Study:

  • To investigate sex-based differences in leg substrate utilization during prolonged submaximal exercise.
  • To compare the contribution of intramuscular triacylglycerol, plasma fatty acids, and carbohydrates to energy production in male and female endurance athletes.

Main Methods:

  • Arteriovenous catheterization and stable isotope tracers were employed to measure substrate uptake across the leg.
  • Muscle biopsies were analyzed for changes in myocellular triacylglycerol content.

Related Experiment Videos

  • Subjects underwent 90 minutes of bicycle exercise at 58% of peak oxygen uptake (VO2 peak).

    • Main Results:

    • Myocellular triacylglycerol (TG) degradation was significantly higher in females (12.4 mmol/kg dry wt) compared to males (negligible).
    • Utilization of plasma fatty acids, blood glucose, and glycogen was similar between genders.
    • While overall substrate oxidation accounted for nearly all leg oxygen uptake in females, 28% remained unaccounted for in males, suggesting alternative lipid utilization.

    Conclusions:

    • No gender difference was observed in the overall contribution of carbohydrates and lipids to oxidative metabolism during submaximal exercise.
    • Females rely more on intracellular TG stores, while males may utilize other lipid sources like very-low-density lipoprotein-TG.
    • These findings highlight a gender-specific pattern in the utilization of different lipid sources during endurance exercise.