Rotation Momentum and its Relationship with some Launch Variables to Attack Serve in Volleyball

Abstract

ABSTRACT

The aim of present study is to know the relationship between rotation momentum and some of launch variables to attack serve in volleyball. Eleven (11) players from University of Babylon team were selected and have been subjected to height, weight, and age measurements, as well as attack serve test in volleyball. A descriptive research design was used because it is suitable to the nature of the study. We filmed the performance with a camera its speed of 60 images/S, then the imaging video of the performance was analyzed by (Kinovea) program to extract mechanical variables under study (the horizontal distance of the body gravity center for the focal point of the player), after that we extracted rotation momentum of the body, moreover, we got variables (launch speed and angular of the ball launching). The study was conducted in 2014 and data was analyzed by using SPSS. Our conclusion showed that there is a significant relationship between rotation momentum and angular of launching the ball and launch speed.

Keywords: Rotation momentum, launch variables, attack serve, volleyball.