Changes in leg kinematics in response to unpredictability in lateral jump execution

Area of Science:

• Biomechanics
• Motor Control
• Sports Science

Background:

• Lateral movements are crucial in team sports.
• Understanding motor control adaptations to unpredictable tasks is vital for injury prevention.

Purpose of the Study:

• To analyze motor control adaptations during lateral jumps under predictable versus unpredictable landing conditions.
• To investigate the role of the hip joint in modulating movement strategies for task unpredictability.

Main Methods:

• Twelve subjects performed lateral jumps with stable, sliding, or counteracting landings.
• Landing conditions were either known (predictable) or unknown (unpredictable) beforehand.
• Kinematic analysis focused on hip and knee joint movements in frontal and sagittal planes.

Main Results:

• Hip joint abduction significantly increased in the unpredictable setting across all landing modalities.
• Sliding landings showed decreased hip and knee flexion in the unpredictable condition.
• Stable landings exhibited increased knee abduction in the unpredictable condition post-ground contact.

Conclusions:

• Pre-programmed motor activity for lateral jumps is influenced by landing predictability.
• The hip joint plays a key role in adapting motor control for unpredictable lateral movements.
• Observed kinematic changes, particularly increased knee abduction, may indicate a higher injury risk in unpredictable settings.