Intense aerobic performance can be improved with full glycogen stores in the liver and optimal blood sugar levels. In addition, time of consumption can make all the difference in performance and assimilation of nutrients.
Physiology of Nutrient Storage
All muscles require pure glucose to perform work. The blood at any given time carries only 80 calories for performance of this work. In aerobic activities, 80 calories are usually used up in the first 15 minutes and if intense activity is performed, much sooner. In order to continue activity, one must tap their glycogen stores in the liver. The liver has the storage capacity of 300-400 calories. Since the digestive system takes up to three to four hours to replace glycogen stores once depleted, it is imperative that one eats following aerobic activities to replenish depleted stores.
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