KINEMATICS ANALYSIS IN JUMPING SERVE OF THAI WOMEN VOLLEYBALL NATIONAL TEAM

Abstract

The analysis was conducted on the performances of the jumping serves of 8 women volleyball players, all of whom are members of the Thai National Team. There were two parts of analysis: the anthropometric and the kinematic. Objectives: To define the kinematics and total mechanics of the energy differences between the jumping serve skills of women volleyball players. Methods: The kinematics data were recorded by using 4 cameras, utilizing Casio Ex-Fc 100 (1280×720 pixel) technology and the 2D Motion Analysis system. Kinematics data included linear and angular velocity, and the linear and angular acceleration of the upper and lower extremity and the center of gravity, as well as the kinetics and potential energy during ball contact. The statistics were measured in mean and SD. Results: The average of ages was 25.2±4.1 years, bodyweight 66.1±3.9 kg, body height 176.6±3.8 cm, arm length 80.2±9.6, leg length 103.2±3.1 and the width of arm to arm 182.6±7.3 cm The maximum of linear velocity of finger, wrist, elbow, hip, and knee were 16.32, 13.25, 6.12, 1.95, and 4.22 m/s, respectively. The maximum of linear velocity of shoulder and ankle were 3.57, and 4.95 m/s respectively. The maximum of linear acceleration of wrist, elbow, and hip were 271.85, 110.03, and 25.09 m/s², respectively. The maximum of linear acceleration of the finger and shoulder were 271.74 and 53.88 m/s², respectively. The maximum of the linear acceleration of the knee was 18.69 m/s². The maximum of the linear acceleration of the ankle and toe were 40.4 and 50.95 m/s², respectively. The maximum of the angular velocity of the wrist, hip, and ankle were 397.35, 536.66, and 286.5 deg/s, respectively. The maximum of the angular velocity of the elbow and knee were 1186.7 and 304.73 deg/s, respectively. The maximum of the angular velocity of the shoulder was 493.61 deg/s. The average velocity of the center of gravity was 2.07±0.65 m/s, and the maximum was 3.15 m/s. The maximum relative of the height of C.G. and body height was 86.8%, and the average total mechanical energy was 1039.5 ±219.4 Nm. Conclusions:  The appearance of the upper body joints of elite volleyball players during ball contact could be used as a criterion of jumping serve skill and as a measure of basic-performance.

(Journal of Sports Science and Technology 2014;14(2): 25-30 )