The pre-stored ATP energy of human body can only last 15 seconds, and it will be used up after running 100 meters. After running 200 meters, the next 100 meters must be powered by the rapid synthesis of blood sugar in anaerobic state, and its by-product is lactic acid. Running 200 meters or 400 meters, swimming 100 meters, tennis, football and other sports all use the energy provided by anaerobic decomposition of blood sugar, so a lot of lactic acid is accumulated in muscles after exercise, which is a substance that causes muscle pain after exercise. The blood sugar required for this exercise is provided by starch, so you can't burn fat. This is not aerobic exercise, and it is not good for losing weight.
The energy provided by anaerobic decomposition of blood sugar (starch) can only last for 40 seconds, and it will be used up after running 400 meters. When running 800 meters, in the next 400 meters, blood sugar, blood fatty acids and blood amino acids must be synthesized to provide energy, while blood sugar is supplied by starch decomposition, blood fatty acids are supplied by fat decomposition, and blood amino acids are supplied by protein decomposition. This whole process needs oxygen, that is, oxygen burns starch, fat and protein to produce heat energy ATP, which supplies the heat needed in the later stage of exercise. This is aerobic exercise.
Running 800 meters or 1500 meters, swimming 200 meters or 400 meters, boxing and other sports all need oxygen to start burning starch, fat and protein, so the later stage of this kind of sports is aerobic exercise. As aerobic exercise, the heart rate is generally 65,438+0, 30 beats/min. Burn starch about five minutes before exercise. The longer you exercise, the more fat you burn. As long as it lasts for half an hour to an hour, 50% of the calories consumed are supplied by burning fat. If you don't go on a diet, even if you do aerobic exercise for an hour, you can only burn the starch and fat in food, but not the fat accumulated in the human body, which is useless for losing weight. After dieting, an hour of aerobic exercise has a chance to burn body fat.