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Postexercise macronutrient oxidation: a factor dependent on postexercise macronutrient intake.

I Dionne1, S Van Vugt, A Tremblay

  • 1Division of Kinesiology, Physical Activity Sciences Laboratory, Laval University, Ste-Foy, Québec, Canada.

The American Journal of Clinical Nutrition
|May 8, 1999
PubMed
Summary
This summary is machine-generated.

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Exercise does not alter postexercise fat oxidation or energy expenditure when energy intake immediately compensates for exercise. Compensating for exercise energy expenditure prevents changes in substrate utilization.

Area of Science:

  • Exercise Physiology
  • Human Metabolism
  • Nutritional Science

Background:

  • Exercise is known to increase postexercise fat oxidation and energy expenditure.
  • The impact of exercise on substrate utilization can be influenced by subsequent energy intake.

Purpose of the Study:

  • To investigate how exercise affects postexercise substrate oxidation and energy expenditure.
  • To determine if immediate energy and macronutrient compensation negates exercise-induced metabolic changes.

Main Methods:

  • Eight young men underwent 61-hour whole-body indirect calorimetry.
  • Conditions included a sedentary control and a session preceded by 60 minutes of exercise at 50% maximal oxygen consumption.
  • Postexercise, participants consumed a milkshake matching exercise energy expenditure and respiratory quotient.

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Main Results:

  • No significant differences in 24-hour energy expenditure (24EE) were observed between conditions.
  • The respiratory quotient, reflecting substrate utilization, remained unchanged postexercise regardless of prior exercise.
  • Immediate compensation of energy and macronutrient intake effectively negated exercise effects on substrate oxidation.

Conclusions:

  • Voluntary energy and macronutrient intake compensation significantly influences postexercise substrate utilization.
  • Exercise's ability to alter substrate utilization is largely dependent on immediate postexercise nutritional compensation.
  • Metabolic adaptations to exercise regarding substrate use are reversible with appropriate energy intake.