The relationships between technique variability and performance in discus throwing.

Area of Science:

• Sports Biomechanics
• Athletic Performance Analysis

Background:

• Discus throwing performance is linked to technique.
• The precise relationship between technique variability and throwing performance remains unclear.

Purpose of the Study:

• To investigate the association between technique variability and discus throwing performance in male and female athletes.
• To identify specific technique variables that influence throwing distance.

Main Methods:

• Collected video data of 33 discus throwers (18 male, 15 female) during competition.
• Digitized 2D coordinate data into 3D body landmark coordinates.
• Calculated and time-normalized eight joint angles, measuring variability via mean standard deviations across three throws.
• Correlated technique variability measurements with the best official throwing distance.

Main Results:

• Significant canonical correlations between technique variability and performance were found in male throwers (P < 0.1).
• Male performance negatively correlated with variability in arm-shoulder separation (r = -0.57), hip-shoulder separation (r = -0.63), left hip flexion (r = -0.5), and trunk tilt (r = -0.57).
• No significant correlations were found for female throwers (P > 0.1).

Conclusions:

• Male discus throwers achieving longer distances exhibit less variability in reproducing their techniques.
• Minimizing motion variability in specific joint movements may be a crucial training objective for male discus throwers to enhance performance.