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Exercise Training and Fasting: Current Insights.

Hassane Zouhal1, Ayoub Saeidi2, Amal Salhi3

  • 1M2S (Laboratoire Mouvement, Sport, Santé), University of Rennes, Rennes F-35000, France.

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|February 6, 2020
PubMed
Summary
This summary is machine-generated.

Fasting and exercise may not enhance fat oxidation for endurance athletes. Research suggests avoiding high-intensity training during fasting periods to maintain performance and avoid negative adaptations.

Keywords:
Ramadancalorie restrictionendurance performancefasting stateglucose metabolismmetabolic adaptation fat oxidation

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Area of Science:

  • Sports Science
  • Nutritional Physiology
  • Metabolic Adaptations

Background:

  • Fasting, the abstinence from food and beverages, is utilized in various healthcare systems for chronic disease management.
  • Exercise during fasting increases lipolysis and fat oxidation, potentially aiding weight loss and fat utilization.
  • The impact of fasting on metabolism, including protein and glucose, is noted, but data in trained athletes are conflicting.

Purpose of the Study:

  • To review the literature on endurance training adaptations during fasting.
  • To assess if combined fasting and endurance exercise enhance fat oxidation and long-term endurance.
  • To clarify the effects of fasting on athletic performance and metabolism.

Main Methods:

  • Literature review assessing studies on fasting, exercise, metabolism, and performance.
  • Analysis of research investigating fat oxidation, glucose metabolism, and body composition changes.
  • Evaluation of factors contributing to conflicting findings in existing studies.

Main Results:

  • Fasting decreases body weight, lean body mass, and fat content in both trained and untrained individuals.
  • Evidence supporting fasting and endurance training-mediated increases in fat oxidation is limited.
  • Conflicting data exist regarding fasting's effects on glucose metabolism and physical performance in athletes.

Conclusions:

  • Endurance athletes are advised to avoid high-intensity training while fasting.
  • Current evidence does not support the idea that combined fasting and endurance exercise improve fat oxidation or performance.
  • Further research is needed to understand the nuanced effects of fasting on athletic populations.