How long does it take for aerobic exercise to start burning fat?

　　Aerobic exercise is one of the most common and effective ways to lose weight. In order to really start burning fat, you need to determine the time and intensity of exercise. Let’s take a closer look at how long it takes for aerobic exercise to start burning fat.

　　During aerobic exercise, our energy expenditure is divided into two parts: oxidized glycogen and oxidized fat. During high-intensity exercise, our body mainly relies on glycogen as an energy source, and when glycogen is depleted, the body begins to use fat. In contrast, during low-intensity aerobic exercise, the body relies on fat as its primary energy source, rather than glycogen. That's why low-intensity aerobic exercise is more effective at burning fat.

　　During aerobic exercise, we enter two stages: anaerobic metabolism and aerobic metabolism. At the beginning of exercise, the body uses a large amount of anaerobic metabolism for energy conversion, that is, glycogen is used as the main energy source. This stage can last for more than ten minutes until glycogen reserves are gradually exhausted, at which time the body enters the aerobic metabolism stage. At this time, the body begins to mobilize fat as its main energy source and begins to consume fat.

　　This aerobic metabolism time point varies from person to person, and generally occurs after 20 to 30 minutes of exercise. For heavier people, this time may be longer. Therefore, to effectively consume fat, we need to do the following two things:

　　1. Maintain appropriate exercise intensity. We need to find an exercise intensity that suits us so that our body does not rely on glycogen as its main source of energy. This intensity is generally between 65% and 80% of the maximum heart rate within the range. You can determine the appropriate intensity of exercise by measuring your own heart rate.

　　2. Longer duration. To really start burning fat, we need to keep exercising for more than 30 minutes. Especially for people who want to lose weight, it is best to control the time of each aerobic exercise to about 45 to 60 minutes to ensure effective fat consumption.

　　To sum up, to effectively consume fat, we need appropriate exercise intensity and duration. It is recommended to choose low-intensity, long-term exercise and maintain a suitable heart rate during aerobic exercise training. Only in this way can the effect of weight loss be truly achieved.

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