Study design: Randomized controlled trial.
Objective: To determine if the addition of real-time feedback (RTF) to postresponse feedback (PRF) improves jump-landing kinematics compared to PRF alone and a no-feedback control group.
Background: Injury-prevention programs to reduce risk of anterior cruciate ligament injury have shown promising results in altering jump-landing biomechanics. Real-time feedback provided during the task may allow participants to more easily understand and execute new movement strategies compared to PRF provided after the task is completed.
Methods: Thirty-six healthy females were randomized to 1 of 3 groups: RTF plus PRF, PRF, or control. Sagittal plane moments and angles at the knee and hip, frontal plane angles at the knee, and vertical ground reaction forces during a jump-landing task were quantified at baseline and postintervention. The RTF plus PRF and PRF groups received a PowerPoint presentation containing the goals of correct landing technique. In addition to the PowerPoint presentation, the RTF plus PRF group was provided real-time visualization of their frontal plane knee angle. Participants in the control group performed the jump-landing task without feedback.
Results: Posttraining, the RTF plus PRF and PRF groups demonstrated similar improvements in hip and knee flexion and decreased vertical ground reaction forces compared to the control group. There were no changes in frontal plane knee kinematics between groups posttraining.
Conclusion: The addition of RTF to PRF did not result in significant changes in jump-landing kinematics compared to PRF alone.
Level of evidence: Prevention, level 5.
Keywords: anterior cruciate ligament; biofeedback; instruction; knee abduction; prevention.