Kinematic differences in elite-level American male and female javelin throwers
Elite-level American female javelin throwers throw less than 70% of the distance their male counterparts throw due primarily to their smaller javelin release velocity. The purpose of this study was to investigate if other kinematic differences exist during the final release phase. The two longest legal throws were analyzed for each of the nine finalists in the mens and womens competition at the 2003 National Championships. During the final release phase, each thrower landed on their right foot (RTD), planted their left foot (LTD) and released the javelin (REL). Twenty-one body and three javelin landmarks were digitized and standard DLT methods were used to obtain 3D data from before RTD past REL. Comparisons were made between the males and females trunk backward/forward angle and the javelins attitude, release, and attack angles. All comparisons were made using t-tests with a = 0.025 (a = 0.05, adjusted for multiple comparisons). The trunks backward/forward lean angle was significantly different for the males and females at RTD (-19.8° and -24.0°, respectively) and at LTD (-12.5° and -20.9°, respectively). However, their trunk angles were not significantly different at REL (22.3° and 20.9°, respectively). The javelins attitude angle was significantly different at RTD (26.3° and 35.7°, respectively), at LTD (31.3° and 40.3°, respectively), and at REL (33.8° and 41.8°, respectively). Curiously, the release angle of the javelin was not significantly different (32.3° and 32.2°, respectively). The females larger backward lean angle at RTD and LTD may contribute to the larger attitude angle, while at REL, similar trunk angles may relate to similar release angles. The combination of angles at REL led to much larger attack angle for the females (9.6° versus 1.8°) which, in general, diminishes the throw distance. These differences may partially explain the large differences in the distance thrown by the males and females.
© Copyright 2004 The Engineering of Sport 5, Volume 1. Published by International Sports Engineering Association. All rights reserved.
|Subjects:||javelin throw male female high performance sport elite sport USA analysis biomechanics angel release cinematography movement technique|
|Notations:||strength and speed sports|
|Published in:||The Engineering of Sport 5, Volume 1|
|Editors:||M. Hubbard, R. D. Mehta, J. M. Pallis|
International Sports Engineering Association