Biomechanical analysis of shoulder and hip angle in tennis technique of two-handed backhand slap topspin

The batting technology rationality is very important in tennis playing. It has a direct impact on the athlete´s sports performance and health. Two-handed backhand batting technology is a weak item in most athletes´ integral technology. This research studies the two-handed backhand slap topspin by high-speed photography technology and surface EMG technique. Biomechanics analysis show that the shoulder and hip angle change in the entire motion process of batting is based on the difference of the muscle discharge in left and right sides of the trunk, and shoulder and hip angle change in the front cross hit stage is mainly a left anterior deltoid contraction discharge results. According to the results of this study, we suggest coaches and athletes should strengthen the exercise of the muscle groups which affect the shoulder and hip angle change to improve the athletes´ two-handed backhand topspin technical rationality.