Identifying coordination between joint movements during a throwing task with multiple degrees of freedom.

Area of Science:

• Sports Biomechanics
• Motor Control
• Human Movement Analysis

Background:

• Joint coordination is vital for motor task achievement.
• Previous methods struggle to identify specific coordinated joint movements.
• Understanding joint coordination is crucial in sports biomechanics.

Purpose of the Study:

• To propose a novel method for identifying joint coordination.
• To examine coordinated joint movements in overhead throwing.
• To quantify the effect of joint deviations on throwing velocity.

Main Methods:

• Utilized a motion capture system with 14 baseball players.
• Quantified the index of coordination for each joint.
• Assessed the impact of individual joint deviations on vertical hand velocity.

Main Results:

• Identified coordination between shoulder internal/external rotation angle (θ1-IE) and other joint movements.
• Found coordination between shoulder horizontal flexion/extension angular velocity (ω1-FE) and other joint movements.
• Demonstrated that deviations in θ1-I and ω1-F significantly impact hand velocity, necessitating compensatory coordination.

Conclusions:

• The proposed method effectively identifies coordinated joint movements in multi-degree-of-freedom systems.
• Specific shoulder movements (θ1-IE, ω1-FE) require coordinated compensation from other joints for accurate throwing.
• Findings provide insights into optimizing motor tasks through understanding joint coordination.