Correlation Between Javelin Throw Performance and Biomechanical Parameters in Elite Paralympic Throwers Across Different Functional Classes: A Conceptual Performance Model

Background: In Paralympic throwing events, athletes are classified into different functional classes based on the type and severity of their impairment. Despite the importance of motion analysis in improving performance, the precise relationships between biomechanical parameters and performance outcomes in Paralympic throwers have not been well established. Therefore, this study aimed to examine the correlations between javelin throw performance and biomechanical variables in elite Paralympic throwers across different functional classes.
Methods: This semi-experimental study included 24 world and Paralympic champion throwers representing seated (F34, F53, F54, F55, F56, F57) and standing (F44, F46) functional classes. Kinematic data were captured at 240 Hz using a digital video camera with 20-mm reflective markers. After joint marker placement and motion recording, data were processed using software’s Skillspector and MATLAB 2014a. Spearman’s rank correlation and simple linear regression analyses were used to examine relationships among variables, while bootstrapping was applied to calculate confidence intervals. Analyses were conducted both by Within-Class Analysis and Pooled Analysis Based on Sitting and Standing Conditions.
Results: The results revealed that release velocity was the strongest predictor of throwing performance across most classes. Inverse relationships were observed between certain angular and joint acceleration variables and performance in different classes. In the Pooled Analysis, release velocity remained the most significant determinant of performance for both seated (r = 0.98, p < 0.001, CI [0.91, 1.00]) and standing (r = 1.00, p < 0.001, CI [1.00, 1.00]) throwers. Seated throwers demonstrated stronger correlations between performance and joint angular velocity and acceleration of the shoulder, elbow, and trunk (p < 0.05), while an inverse correlation was found for wrist kinematics in the standing group. Overall, seated throwers exhibited stronger kinematic-performance associations compared with their standing counterparts.
Conclusions: The findings indicate that various kinematic parameters, particularly release velocity, are significantly associated with javelin throw performance among Paralympic throwers of different functional classes. Moreover, trunk control plays a crucial role in determining throwing quality. These results highlight the need for targeted, class-specific training programs. Implementing training protocols based on these findings could effectively enhance javelin throw performance in elite Paralympic athletes.