Implicit video feedback produces positive changes in landing mechanics

Area of Science:

• Biomechanics
• Motor Learning
• Sports Medicine

Background:

• Implicit (IF) and explicit (EF) feedback are motor learning strategies that influence movement patterns.
• Evidence comparing the effectiveness of IF and EF is conflicting.
• This study investigated the impact of reduced IF and EF video feedback on lower extremity landing mechanics.

Purpose of the Study:

• To compare the effects of implicit and explicit feedback on lower extremity landing biomechanics.
• To determine which feedback strategy leads to more effective motor learning and skill acquisition.
• To provide evidence-based recommendations for injury prevention programs.

Main Methods:

• Thirty participants were randomly assigned to IF, EF, or control groups.
• Participants performed 6 weeks of box-drop jumps with group-specific video feedback (IF or EF) or no feedback (control).
• 3D lower extremity biomechanics were assessed at multiple time points, including baseline, post-training, and retention, to analyze changes in joint angles and moments.

Main Results:

• Implicit feedback led to significant improvements in hip abduction and knee abduction moments compared to explicit feedback.
• Explicit feedback appeared to degrade motor learning, showing less favorable changes in landing mechanics.
• Significant time effects were observed for hip flexion, hip abduction moment, knee abduction angle, and knee abduction moment across testing sessions.

Conclusions:

• Implicit feedback positively altered landing mechanics, suggesting its utility in reducing anterior cruciate ligament (ACL) injury risk.
• Explicit feedback was found to be detrimental to motor learning in this context.
• Recommendations include prioritizing implicit feedback, especially early in training, with less reduction during the acquisition phase.