title: Immediate effects of real-time feedback on jump-landing kinematics.
abstract: METHODS
  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.
  
  
  CONCLUSIONS
  The addition of RTF to PRF did not result in significant changes in jump-landing kinematics compared to PRF alone.
  
  
  METHODS
  Prevention, level 5.
authors.affiliation: Northern Kentucky University, Highland Heights, KY.
authors.forename: Hayley M
authors.initials: HM
authors.lastname: Ericksen
authors.forename: Abbey C
authors.initials: AC
authors.lastname: Thomas
authors.forename: Phillip A
authors.initials: PA
authors.lastname: Gribble
authors.forename: Sara C
authors.initials: SC
authors.lastname: Doebel
authors.forename: Brian G
authors.initials: BG
authors.lastname: Pietrosimone
mesh_terms: D000070598:Anterior Cruciate Ligament Injuries; D001696:Biomechanical Phenomena; D025461:Feedback, Physiological; D005260:Female; D006615:Hip / Q000502:physiology; D006801:Humans; D007718:Knee Injuries / Q000517:prevention & control*; D007719:Knee Joint / Q000502:physiology*; D009068:Movement / Q000502:physiology; D059385:Plyometric Exercise; D013997:Time Factors; D055815:Young Adult
keywords: anterior cruciate ligament; biofeedback; instruction; knee abduction; prevention