Landlord, aerobic energy supply system is generally used in track events, and its general definition and function in this field are as follows: The research of exercise physiology proves that the direct energy of human exercise comes from ATP (adenosine triphosphate). The ATP required in exercise depends on the energy supply capacity of human energy metabolism system, that is, it depends on three energy supply systems: ATP-CP system, that is, non-lactic acid energy supply system; Anaerobic glycolysis system, that is, lactic acid energy supply system; Aerobic energy supply system. These three energy supply systems are not independent of each other, but closely linked and coordinated to form a complete energy supply system. Lactic acid produced by anaerobic metabolism should be eliminated by aerobic metabolism, otherwise the body will be acidotic because of the accumulation of lactic acid, so it is difficult to maintain high-intensity exercise, which means that speed endurance is difficult to reflect. At the same time, the stronger the aerobic metabolism ability, the faster the athlete's physical recovery, which is not only reflected in the recovery after exercise, but also in the process of exercise. Only when the body is restored, athletes can bear the stimulation of greater exercise load and establish a new metabolic balance, thus achieving good results. People have realized the functions of these three energy supply systems, but there are still some different understandings about the interaction of these systems in the training process, especially the important role of aerobic energy supply system. First, the role of aerobic energy supply system in short-distance events In the process of high-intensity muscle contraction, energy comes directly from ——ATP, a high-energy compound in muscle. After the start of exercise, if a small amount of ATP stored in muscle is partially consumed and cannot meet the energy demand, ATP energy supply will be quickly replaced by three energy systems with different proportions. First, creatine phosphate stored in muscle provides energy; Secondly, the anaerobic oxidation of sugar produces lactic acid for energy supply, which is usually called lactic acid system or glycolysis system. These two systems do not consume oxygen in the process of energy supply, so they are called anaerobic energy supply systems. Anaerobic energy supply system produces energy very quickly and plays an important role in short-term and high-intensity sports, such as sprint. However, the energy generated by anaerobic energy supply system is very limited. With the accumulation of lactic acid and the consumption of creatine phosphate, the speed will decrease. Comparatively speaking, aerobic energy supply system can generate a lot of energy, but the process of generating energy by aerobic energy supply system is not fast enough, because aerobic energy supply system needs to decompose sugar or fat in muscles to supply energy with sufficient oxygen, and the body needs to deliver oxygen to working muscles. Generally speaking, only when these three energy systems supply energy together can we better meet the energy demand in sports. For example, creatine phosphate system is very important for sprint events. Lactic acid energy supply system is more suitable for sprint events, such as 100m, 200m and 400m. Aerobic energy supply system plays an important role in middle and long distance running and long-term endurance events. In fact, no matter what kind of exercise, the energy consumed comes from three energy supply systems. After the exercise began, the three energy supply systems worked together. Because the process of consuming CP to generate ATP is very simple and fast, huge energy can be generated in the first few seconds of exercise, but these energies generally last at most 16 ~ 28 seconds. Moreover, the greater the intensity of exercise, the faster the energy consumption. Recent studies have found that aerobic energy supply system also participates in energy supply quickly in sprint events and plays a very important role in sprint and middle-long distance running events. About 50% of energy in 60-second exhaustive exercise comes from aerobic oxidation system. After 30 seconds of exercise, the oxygen uptake can reach 70% ~ 90% of the maximum oxygen uptake of athletes, and after 1 minute of high-intensity exercise, the oxygen uptake almost reaches the maximum. Based on the research results of oxygen debt and muscle tissue slicing technology in recent ten years, it can be known that aerobic energy supply system also plays an important role in extreme exercise from 5 to 240 seconds. Second, the role of aerobic energy supply system in middle and long distance running events. The important role of aerobic energy supply system in middle and long-distance running has long been recognized by people, but how big is the role of aerobic energy supply system in middle and long-distance running and the ratio of aerobic energy supply system to anaerobic energy supply system has always been a research topic. In order to evaluate the contribution of aerobic system to middle-distance running events, the ratio of aerobic energy supply to anaerobic energy supply in middle-distance running events was found through experimental research (see table 1). Fox, an American physiologist, believes that the proportion of three energy systems in middle and long distance running projects is: ATP-CP system 20%, lactic acid energy system 55% and aerobic oxidation system 25%. It can be seen that he thinks that the percentage of aerobic and anaerobic energy supply is 25% and 75%. Chinese scholars have proposed that the energy supply system for middle and long distance runners includes aerobic energy supply, anaerobic energy supply and mixed oxygen supply (see Table 2). From Table 3 and Table 4, we can see the energy requirements of four different track events and the different ratios of aerobic and anaerobic energy supply. In 400m, 800m and 1500m projects, the energy supply of anaerobic system is very similar. The main performance of each event is that the longer the duration, the different the demand for extra aerobic energy. In the 400-meter event, the anaerobic energy supply capacity is rapidly exhausted, so it is difficult to effectively ensure a high average speed, which requires the aerobic system to provide more energy. For the 1500m project, the average speed is relatively low, and the consumption of anaerobic energy supply capacity is slow. The anaerobic energy supply capacity and the maximum speed of aerobic energy supply system determine the average speed during exercise. (To be continued)