effects of short-term plyometric training on countermovement vertical jump height and kinematics of take-off

Background: countermovement vertical jump is a crucial skill in many sports. plyometric training is a prevalent method to improve athletes’ jumping ability. objectives: the present study aimed to investigate the effect of a 6-week plyometric training on the kinematics of take-off and countermovement vertical jump height. methods: fifteen young, healthy male subjects performed plyometric exercises in three sessions per week for six weeks. digital videos of pre-training and post-training jumps were captured. the kinovea software was used to measure the kinematic parameters of take-off in the sagittal plane. pre and post-training values were compared by paired sample t-test with the statistical significance level of p < 0.05. results: post-training results showed a higher jump height (p < 0.05), more flexed shoulder, and more extensive hip and knee at take-off (p< 0.05). also, while hip extension velocity was decreased, shoulder flexionand knee extension velocities were significantly increased (p < 0.05). conclusions: the 6-week plyometric training, including 720 jumps, improved shoulder flexion, and hip and knee extensions at take-off, resulting in high cmj height.we employed plyometric training to improve the shoulder flexion and hip and knee extension velocities and increase cmj height.