After a full meal, gastrointestinal activity is enhanced, digestive juice secretion is increased, and the amount of blood needed in the process of digesting food is also increased. At this time, if strenuous exercise is carried out immediately, gastrointestinal activities and secretion of digestive juice will be inhibited due to the adjustment of nerve and body fluid factors, so that the blood supply in the gastrointestinal tract will be relatively reduced, and more blood will be supplied to the motor organs, which will lead to the weakening of gastrointestinal digestive function and easily cause gastrointestinal discomfort and pain, and even indigestion.
Similarly, you should eat regularly after exercise, because the center that manages muscle activity is in a state of high excitement during exercise, and at the same time, the digestive organs are inhibited, and the activities of the digestive organs will take some time to recover. Therefore, generally, after a long period of strenuous exercise, don't want to eat immediately, and rest for about 30 minutes before eating.
When to start exercising after a meal depends on the food. For general meals, exercise is best arranged after meals 1 hour. If you eat a very rich meal, you'd better exercise after 2 hours. The gastrointestinal tract needs to digest food, keep crawling, and secrete gastric juice and intestinal juice. At this time, it needs to have enough blood supply.