Modular organization of intermuscular and interjoint interaction during ball catching

Area of Science:

• Biomechanics
• Motor Control
• Rhythmic Gymnastics

Background:

• Ball-catching movements in rhythmic gymnastics involve complex biomechanical structures.
• Understanding the underlying synergies is crucial for optimizing performance and training.

Purpose of the Study:

• To examine the organization of ball-catching movements based on common synergies.
• To identify specific synergies in movements with increased coordinative complexity.

Main Methods:

• Simultaneous recording of electromyographic (EMG) data from 16 muscles and joint angle kinematics.
• Application of factor analysis and principal component analysis to derive synergy parameters.

Main Results:

• Kinematic analysis showed similar motor control strategies for ball catching, with interjoint coordination structured into two modules.
• Muscle activity revealed up to five modules, with two consistently present for upper limb motion and shoulder stabilization.
• Synergy composition depends on biomechanical structure and shared subtasks.

Conclusions:

• Ball-catching movements exhibit conserved kinematic modules and core muscle synergies.
• Movement complexity influences the specificity of kinematic modules and muscle synergy composition.
• These findings provide insights into the neural control of complex motor skills in sports.