Fat contributes 50 to 70% of the energy requirements during light and moderate exercise. Stored fat (intramuscular and those in the adipose fat cells) plays an increasingly important role with prolonged exercise. Fatty acid molecules (mainly circulating FFAs) provide more than 80% of the exercise energy requirements.
Carbohydrate depletion reduces exercise intensity to a level determined by the body’s ability to mobilize and oxidize fatty acids.
Aerobic training increases long-chain fatty acids oxidation (combustion), mainly fatty acids from triglycerides from within active muscle during mild-to-moderate intensity exercise.
Enhanced fat oxidation with training spares glycogen (the more powerful fuel); this allows trained individuals to exercise at a higher level of submaximal exercise before experiencing fatigue effects of glycogen depletion.
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