Task-specific initial impact phase adjustments in lateral jumps and lateral landings

Area of Science:

• Biomechanics
• Sports Science
• Motor Control

Background:

• Lateral jumps involve complex kinematic and neuromuscular adjustments.
• Foot placement and upper leg adaptations are key to managing impact loads.
• Understanding task-specific differences in lateral movements is vital for injury prevention.

Purpose of the Study:

• To compare lateral jumps and landings, focusing on the initial impact phase under varied stretch-loads.
• To elucidate task-specific kinematic and neuromuscular adaptations during lateral jumps versus landings.
• To investigate the role of foot placement in modulating joint loading during lateral impacts.

Main Methods:

• Ten subjects performed lateral jumps and landings from varying distances.
• Electromyographic (EMG) data from five lower extremity muscles were recorded.
• Lower extremity kinematics and kinetics were analyzed using 3D motion capture.

Main Results:

• Lateral jumps exhibited higher impact forces and joint moments (except initial knee abduction) than landings.
• Greater sagittal knee/hip displacements and more exorotated foot placement were observed in lateral jumps.
• Increased pre-activity and post-impact EMG in thigh muscles and tibialis anterior (TA) were noted in lateral jumps.

Conclusions:

• Task specificity in lateral jumps hinders adequate stretch-load modulation, impacting ankle joint loading.
• Foot placement strategies are critical for mitigating lateral ankle and medial knee joint stress.
• Training interventions emphasizing foot placement can enhance injury prevention in sports involving high-impact lateral movements.