Experimental Study On The Effect Of Swimming Exercise On Body Function And Body Mass Index Of School Aged Boys In Changchun

8-10 years old is one peak of the growth and development of the human body. The physical function and health level of this period directly affect the adult physical, mental and labor capacity. Swimming is a sport that is suitable for all ages, and it is also one of the sports that are popular among school aged children. Swimming as a healthy green sport has become the primary choice for many school aged children.The purpose of this paper is to study the effects of swimming on the physical function and BMI of the school aged boys in Changchun by using a swimming scheme designed in advance. We conduct exercise intervention for 12 weeks in the two groups of school aged boys in Changchun. Before and after the experiment we obtain the data,such as body bending on seat, vital capacity, grip strength, single leg standing with eyes closed, vertical jump, support plate and BMI. And then analyze the effect of swimming exercise on the body function and BMI of school aged boys in Changchun.The results of the experiment are as follows:First, the data of school aged boys who have received swimming intervention,such as body bending on seat, vital capacity, grip strength, single leg standing with eyes closed, vertical jump, support plate, has significantly improved,compared with the data before the experiment. The control group has no significant growth. This shows that through swimming intervention, the vital capacity, joint flexibility, muscle strength and balance ability of the school aged boys are greatly improved. Swimming exercise has significant effect on the development of school aged boys’ body function.Second, the BMI data of school aged boys who have received swimming intervention, is significantly changed, compared with the data before the experiment.The control group has no significant change. With the intervention of swimming training, the body shape of the school aged boys is significantly changed. Swimming exercise has a significant effect on the level of body shape development of the schoolaged boys.In this paper, we explore the swimming exercise to improve the body functions of the school aged boys, and to enhance the level of physical growth of the school aged boys. We also explore suitable swimming training methods for the school aged boys.The research can provide theoretical reference for the scientific instruction of the school aged boys in the swimming teaching.