Contribution of interaction torques during dart throwing: Differences between novices and experts

Area of Science:

• Biomechanics
• Human Movement Science
• Sports Science

Background:

• Dart throwing requires precise control of upper limb joints.
• Understanding the biomechanical strategies differentiating experts from novices is crucial for performance enhancement.

Purpose of the Study:

• To investigate differences in joint torque impulse utilization between expert and novice dart throwers.
• To identify specific torque components (muscle vs. interaction) contributing to net torque generation during dart throwing.

Main Methods:

• Participants performed continuous dart throws towards a bull's eye target.
• Upper-limb joint torque impulses were calculated using inverse dynamics with motion capture and anthropometric data.
• Analysis focused on torque impulse decomposition across different degrees of freedom and movement phases (acceleration, follow-through).

Main Results:

• The elbow flexion-extension degree of freedom (DOF) was found to lead the movement, supporting the joint leading hypothesis.
• During the acceleration phase, experts utilized positive interaction (INT) torque impulses at the glenohumeral (GH) joint (abduction-adduction) and wrist flexion, reducing the need for muscle (MUS) torque.
• Experts demonstrated proficient use of INT torque during follow-through to control elbow extension, unlike novices.

Conclusions:

• Expertise in dart throwing is linked to the strategic exploitation of interaction torques for improved precision.
• Novices rely more heavily on muscle torque impulses, whereas experts leverage interaction torques to optimize movement control.
• The findings highlight the importance of interaction torques in achieving precise movements in sports like dart throwing.