The Relationship Of Some Kinematical Variables of The Hitting Arm And The Percentage of Contribution In Straight Serving Accuracy In Junior Tennis

Abstract

The importance of research to find out some of the Kinematic variables of
striking arm relationship of the striking arm the percentage contribution accuracy for tennis
flat serve for juniors. Through follow-up to the researcher to perform tennis players rookies
have noticed the difference in the form of the movement of parts and joints of the beating
arm (Extension and flexion of joints) the moment of hitting the ball as well as the variation
in scores accuracy, the reason why the researcher study some Kinematic variables of striking
arm in an attempt to find out the type of the correlation between these variables and
accuracy, as well as the percentage of their contribution to the rectal transmission accuracy.
The research sample included the (5) of Baghdad governorate juniors ages (13-9). after
statistical treatment results were obtained which showed the emergence of a very high
correlation between the transmission accuracy and both variable shoulder angle and variable
starting the ball angle, and the emergence of a high correlation between the transmission
accuracy and attachment angle and the relationship of moderate correlation between the
transmission accuracy and the angle of the wrist. Both the shoulder angle well and won the
ball on the launch of a high proportion of the contribution of the transmission angle
accuracy, while the proportion of the contribution of each of attachment angle and the angle
of the wrist in the transmission accuracy. Finally, it was one of the most important
recommendations emphasize the coaches junior categories at the training variables search for
the striking arm being one of the most important determinants of accuracy when
performance.