The Microecology Study Of Intestinal Microflora Of Middle-distance Racers

A commonly accepted fact is that gastrointestinal syndrome during training and competition is a major concern for both recreational and elite athletes, especially for endurance-type athletes, which hindered the normal training and competition. With the increasing of sports intensity and the number of athletes involving in marathon and triathlons, athletes' gastrointestinal symptoms has been considered much. Though researchers performed many studies, the mechanisms responsible for the development of gastrointestinal syndrome during and after exercise have not been determined, However, in those studies, the microflora of gastrointestinal tract has been disregarded. There are many groups of microorganisms in the digestive tract, which constitute microecosystem of human gastrointestinal tract, and it is very important for the health and activity of human, because there are many kinds of enzymes involving in energy produce, metabolisms and signal transfer of the host. In order to discuss the mechanisms of exercise-induced gastrointestinal syndrome, we performed a study on the characters of intestinal microflora of seven middle-distance runners. Based on the prophase work, we clone thecharacteristic genome segment of runners'common flora and test the sequences by bio-informatics. The results show that the common flora of runners'gastrointestinal tract may be a new type that is not reported now, and provide a new clue to study the relationship between exercise intensity and the function of gut. In addition, we find that there are a great deal of E.coli that reside in the gastrointestinal tract of middle-distance runners. But E.coli is a kind of conditioned pathogen, which may destroy the quantitative structure of microflora and increase the potential dangers in the function of athletes'gut. The studies of microecology showed that great changes of circumstances may induce dysbacteriosis. We think that the maladjustment of microecosystem may be multi-reasons for exercise-induced gastrointestinal syndrome. But the realation between dysbacteriosis and dysfunction of gut is complex, either is reason or result. Furthermore, the results of this study hint to us that there are complexity and particularity in the microecosystem of athlete. Further research on exercise-induced gastrointestinal syndrome should inestigate the normal quantity of microflora and how to recovery the balance of microecosystem of athletes.