Running is one of the most popular sports nowadays. No matter it is early morning, late afternoon or night, no matter it is hot or cold, we can always see the figure of “runners” in the streets, parks and communities; and in the circle of friends, there are always people who keep telling you that they have just finished a 5km or 10km run again. So, when is the best time to run? Some people choose to run in the morning, some people choose to run in the afternoon, and some people choose to run at night, but you do not necessarily know, whether it is morning running, afternoon running or night running, it is very delicate, can not run indiscriminately! The benefits of morning running 1, the impact on the major systems of the human body ① Circulatory system: morning running through the regulation of the nervous system, can make the blood redistribution, due to the blood bank into the whole body blood flow increase the amount of blood for the needs of each activity tissue organs. Therefore, people who run regularly in the morning have thickened and stronger heart muscle. The number of heartbeats decreases and the output per bo is increased. ② Whistling system: The acceleration of blood flow allows the timely supply of oxygen to all organs and tissues. Therefore, the whistling system must speed up the exchange of gas with the outside world, thus promoting the enhanced activity of the whistling system, increased lung capacity, and the ability to prevent various diseases of the whistling system. The strengthening of the whistling and circulatory system provides a strong material basis for muscle activity and increases the content of white matter in the muscles, thickens the muscle fibers, develops the capillary network, and increases the content of energy substances such as myoglycone and adenosine triphosphate. Therefore, the muscles are more plump and powerful, the bones are more solid and thick, and the joints are more flexible. ④Digestive system: Long-distance running increases energy consumption, accelerates gastrointestinal peristalsis, makes digestive juice secretion more vigorous, and strengthens absorption ability. Therefore, morning running can enhance appetite and improve the function of the digestive system. 2.Fresh air and less exhaust gas Start running before the transportation is not running, you can absorb fresher air and reduce the amount of exhaust gas carbon dioxide incorporated. 3, open a day of creativity Morning running can make people wake up from a night of sleep and maintain good physical condition throughout the day, open a whole day of creativity, which may be related to the release of endorphins brought by running, this hormone will bring calm, quiet and fresh effect to the body and mind. 4, more exercise your endurance Morning running can exercise one’s will and cultivate the spirit of bravery and tenacity to overcome difficulties. The disadvantages of morning running 1, environmental factors Morning running site mostly lies in the highway, field paths or playgrounds, etc., because there will be fog or other factors in the morning and cause low visibility caused by a variety of sports injuries. 2, air factors morning before sunrise, the lowest oxygen content in the air, morning runners inhale a lot of low oxygen content of the air, and morning because of the minimum wind speed, air flow is small, so the morning air pollution in the day for the largest, morning runners inhale a lot of polluted air so morning runners if a lot of inhalation of these low oxygen content, pollution, containing harmful or toxic substances of fog or suspended particles carrying certain pathogenic bacteria When the air of the bronchial epithelium is stimulated, it will increase the secretion of bronchial epithelial cup cells and cause more sputum. And make the trachea, bronchial fiber movement changes or disorders, destroy the normal defense function of the whistle, so that the whistle susceptibility to increase and cause bronchitis, pharyngitis, etc.. 3, fasting factors ① fasting long-distance runner’s body sugar consumption and not replenished, it will cause a decrease in blood sugar. The energy required for the metabolism of the human nervous system almost all depends on blood sugar supply, so the blood sugar will be reduced to a certain extent to affect the function of the nervous system and cause dizziness, cold sweat, pale, fainting and other phenomena of hypoglycemic shock. If the sugar is not replenished in time, it will bring more serious damage to the human body. ② When running in the morning, the body will sweat a lot, losing more water and salt, due to fasting water, salt is not replenished. Seriously, it will cause water and salt dielectric disorder to bring unnecessary damage to the human body. ③ The human body in the twenty-four hours to the morning blood viscosity is the largest. Plus the morning run and the loss of different degrees of water, and because of fasting can not be replenished. Often can cause thrombosis and other cardiovascular and cerebrovascular diseases occur, leading to serious consequences. 4, intensity: intensity refers to the distance of the morning run, the time of the morning run and the speed of the morning run. Morning running can not control the intensity of the movement and more than their own exercise limit, often due to exercise overload leads to fatigue and sports injuries. It may also lead to the recurrence or aggravation of old diseases and other phenomena that directly affect the health. The benefits of running in the afternoon 1, the human body state in the day will have a best moment, and this time period is the afternoon between 4:00-6:00. Whether from physical strength, mental state, or physical function, are the best, which can not only improve the efficiency of running, but also reduce the possibility of injury in running. 2, 4:00 p.m. is the bladder meridian active time period. This time because of running and the phenomenon of hydration, will be more conducive to the body’s detoxification. Sweating during running is also a very good detoxification method. The bad side of running in the afternoon 1, compared to the morning and night, the afternoon ultraviolet radiation will be stronger, if not do the corresponding sun protection measures, the skin is likely to be tanned or sunburn, especially in the summer. Of course, long-term strong ultraviolet radiation may also cause skin cancer. 2. This time of the afternoon should be the busiest time for most people, so it is often impossible to stick to the end, unless your work or study gives you enough time to choose freely. The benefits of night running 1, night running will be more convenient for most runners, because there is plenty of time, neither affect work, nor study. 2.Night running can make people more relaxed and relieve the stress after a busy day, just put your whole heart and soul into running exercise. 3, night is the time of the day when there is more oxygen and better air quality, choose to run in this time is more beneficial to health. 4, night running to lose weight more effective, because the night is the most vigorous metabolism of the body, conducive to fat burning. 5, the number of platelets in the body’s blood at night is relatively small, which can well avoid the phenomenon of blood clots. 6, night running can also improve the quality of human sleep. The disadvantages of night running 1, the night is relatively more unsafe factors, running at night is easy to happen accidents. 2, the night temperature is low, the chances of wind are also higher. After running and sweating, the pores of the skin are open, and it is easy to get sick from frequent blowing at this time. There is no best running time, only you who run with your heart! So no matter what time you run there are pros and cons, but if you choose not to run, it is certainly the most wrong decision.