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A kinetic analysis of discus-throwing techniques
Bing Yu1, Jeffrey Broker, L Jay Silvester
1Center for Human Movement Sciences, Division of Physical Therapy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7135, USA.
Sports Biomechanics
|December 9, 2003
Summary
Discus throwers can improve distance by optimizing ground reaction forces during support phases and delivery. Key movements include powerful hip extension and knee extension for enhanced performance.
Area of Science:
- Biomechanics
- Sports Science
- Athletic Performance
Background:
- Understanding the biomechanical factors influencing discus throwing distance is crucial for technique optimization.
- Ground reaction forces and lower extremity joint kinetics play a significant role in athletic performance.
Purpose of the Study:
- To investigate the relationships between official distance and ground reaction measures in discus throwing.
- To examine the correlations between ground reactions and lower extremity joint kinetics.
Main Methods:
- Utilized three high-speed cameras and three force plates for 3D data collection.
- Employed an inverse dynamic model to calculate lower extremity kinetics.
- Conducted multiple regression analyses to identify significant relationships.
Main Results:
- Official distance correlated with left and right foot ground reaction forces during specific support and delivery phases.
- Right-hip extension/internal rotation moments and left-knee extension moment during delivery were significantly related to distance.
- Specific force application patterns on both feet during different phases are critical.
Conclusions:
- Discus throwers should focus on vigorous forward drive during the first single-support phase.
- Increasing landing impact force on the right foot post-flight is beneficial.
- Optimizing ground forces and joint kinetics during the delivery phase, particularly right-hip and left-knee movements, enhances throwing distance.