CORRELATION BETWEEN KINEMATICS PARAMETERS OF THE JAVELIN AND THE DISTANCE THROWN IN THAI MALE JAVELIN THROWERS

Abstract

Javelin throwing is sport that has the target of throwing for maximum distance thrown. Optimum of position, direction and velocity of the javelin at instant release are important factors to affect the distance thrown therefore, the study of release parameters at instant release consist of release height, release angle and release velocity of javelin which these parameters need for improvement and development in throwing performance for increase of the distance thrown. Objective of this study, to investigate of release height, release angle and release velocity of javelin and to determine correlation between the distance thrown and release height, release angle and release velocity of javelin. Participants of this study are twelve Thai male javelin throwers that joined competition of Thailand Open Track and Field Championships 2014. A high speed digital camera (Casio Exilim EX-F1) was set 300 frames per second for video recording in this study which position of camera was placed perpendicularly at the right side of the runway for video recording during javelin throwing in sagittal plane that covers both body and javelin at instant release. From statistics test of Pearson Correlation Coefficient (two-tailed) found that the release height of javelin was non-statistically significant linear coefficient correlation with the distance thrown. The release angle of javelin consist of attitude angle (α) and angle of attack (β) were a statistically significant positive linear correlation coefficient with distance thrown (r = 0.643, 0.705 respectively; p < 0.05) but release angle () was non-statistically significant linear coefficient correlation with the distance thrown. The release velocity of the javelin compose of horizontal velocity, vertical velocity and resultant velocity were a statistically significant positive linear correlation coefficient with the distance thrown (r = 0.685, 0.591, 0.694 respectively; p < 0.05 ). Therefore, Thai male javelin thrower should have optimal practice of release height, release angle and release velocity of javelin of javelin at instant release for achievement of increase performance in throwing to affect increase distance thrown.

(Journal of Sports Science and Technology 2015;15(1): 35-43)