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Body composition changes associated with fasted versus non-fasted aerobic exercise.

Brad Jon Schoenfeld1, Alan Albert Aragon2, Colin D Wilborn3

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Summary

Performing aerobic exercise in a fasted or fed state yields similar body fat loss results when combined with a hypocaloric diet. This study found no significant differences in fat mass changes between fasted training and fed training groups.

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Area of Science:

  • Exercise Physiology
  • Nutritional Science
  • Body Composition

Background:

  • Hypothesis: fasted aerobic exercise accelerates fat loss.
  • Investigating the impact of exercise timing on body composition.
  • Limited research on fasted vs. fed exercise with caloric restriction.

Purpose of the Study:

  • To compare fat mass and fat-free mass changes.
  • Evaluate effects of fasted vs. fed aerobic exercise.
  • Examine outcomes in young women on a hypocaloric diet.

Main Methods:

  • 20 healthy young women randomly assigned to fasted or fed groups.
  • 4 weeks of volume-equated aerobic exercise (3 days/week).
  • Hypocaloric diet with nutritional counseling and monitored intake.

Main Results:

  • Both groups exhibited significant weight and fat mass loss.
  • No significant differences in body composition changes between groups.
  • Fasted training did not enhance fat loss compared to fed training.

Conclusions:

  • Aerobic exercise with a hypocaloric diet leads to similar body composition changes.
  • Exercising in a fasted state does not provide additional fat loss benefits.
  • Dietary adherence and caloric deficit are key factors in body composition changes.