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I like short and intense exercise, usually no more than 15 minute bouts. However, according to the literature, bouts of lower intensity and longer duration burn more fat. Exercise bouts of higher intensity and shorter fatfree or lowfat duration tend to burn more glucose. At fatfree or lowfat the beginning of every exercise, you burn more glucose, and less fat (in the form of free fatty acids). This is because of the cascade effect previously mentioned. If you sustain the exercise for about 20 minutes, fatfree or lowfat you reach a crossover point in which your body burns fat and glucose at the same percentage, 50/50. After that point, your body decreases the amount of glucose used (in order to preserve glycogen for the maintenance of blood glucose and fuel for the brain) and increases the amount of fat used for energy. This is what you want! This is when oxidative metabolism is the sole pathway for energy production.
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