Generally speaking, athletes who participate in long-distance running and iron three events are more common. The reason is still inconclusive in the medical field, but it has been proved to be related to factors such as exercise form, duration, exercise intensity, age, gender, training status, diet and so on. During exercise, if blood is supplied to the heart, lungs and skeletal muscles of limbs for a long time, the blood supply to the digestive system will be insufficient. If you exercise for a long time in a hot and humid environment, the impact will be more obvious, because blood will flow to the skin to dissipate heat, so it is normal for your stomach to feel uncomfortable at last. In addition, during running, the abdominal pressure increases greatly, because our core will remain tight all the time, especially in the final sprint stage, breathing becomes heavier, which is likely to squeeze the food in the stomach into the esophagus.
Foreign institutions have investigated 450 long-distance runners, cyclists and triathletes. 67% cyclists and 76% long-distance runners will have exercise gastrointestinal syndrome. Steve, an American scholar, has followed up 3 19 athletes, involving skating, skiing, running and cycling, and the results are roughly the same. The conclusion of the study is that the greater the intensity of exercise (for example, the intensity reaches 90% of the maximum oxygen uptake) and the longer the duration (for example, the intensity of 50% of the maximum oxygen uptake lasts for 2 hours), some symptoms of gastrointestinal discomfort will appear.