Introduction Tennis is a network sport that requires strength, endurance, agility, speed, skill, and other physical demands from participants. Tennis athletes are subject to injuries in their daily training, affecting their competitive performance. Objective Explore the correlation between the location of injuries and the cause of injuries in tennis players. Methods Tennis players were selected as the research subjects. In this study, a questionnaire was used to record tennis injuries. The rehabilitation treatment of tennis players after injuries was summarized and analyzed through statistical methods. Results The main forms of serious sports injuries caused by tennis players were acute and moderate injuries. The most common fractures are mainly ligament and tendon: joint ligament injury or tear, muscle ligament injury, bursitis, and soft tissue ligament contusion. The joints most commonly involved are knees, ankles, elbows, wrists, and shoulders. Conclusion The common causes of sports injuries in tennis players are the inaccuracy of technical movements, insufficient muscular strength, and insufficient strength for preparatory technical activities. In practice, it is recommended that athletes correct and standardize their movements. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.

<abstract><p>The purpose of this study was to examine the effect of neuromuscular electrical stimulation (NMES) immediate intervention training on the countermovement jump (CMJ) height and to explore kinematic differences in the CMJ at each instant. A total of 15 male students who had never received electrical stimulation were randomly selected as the research participants. In the first test, the CMJ performance was completed with an all-out effort. The second experiment was best performed immediately to complete the CMJ operation after NMES for 30 min. Both experiments used a high-speed camera optical capture system to collect kinematic data. The results of this experiment revealed that after im-mediate NMES training, neuromuscular activation causes post-activation potentiation, which increases the height of the center of gravity of the CMJ and affects the angular velocity of the hip joint, the velocity and acceleration of the thigh and the shank and the velocity of the soles of the feet. The use of NMES interventional training based on the improvement of technical movements and physical exercises is recommended in the future.</p></abstract>