Innovative Video Feedback on Jump Landing Improves Landing Techniques in Males
Dallinga J, Benjaminse A, Gokeler A, Cortes N, Otten E, Lemmink K. Int J Sports Med. 2016; [Epub ahead of print]
Take Home Message: Video feedback was a more effective tool to correct landing patterns in males to compared to females, which may be helpful in reducing anterior cruciate ligament (ACL) injury risk.
Anterior cruciate ligament (ACL) injury rates are high for both males and females; however, prevention programs are primarily focused on correcting risk factors for females. As a result, there is little research on which movement pattern correction programs may be useful for male athletes to decrease risk of ACL injuries. Therefore, Dallinga et al. performed a randomized controlled trial to evaluate the effectiveness of providing video feedback following a vertical drop jump. The authors randomized 80 participants, who were healthy, active, and reported no history of ACL injury, into 2 groups (video feedback or control). The participants in the video feedback group were recorded and were able to review a video of their jump superimposed onto an expert’s jump on a television screen, whereas the control group performed the same tasks but did not receive the feedback. All participants completed a pretest session (5 jumps), two training sessions (15 jumps each), and a posttest session (5 jumps). Each session was 1 week apart. Fifty-nine participants (29 male, 30 female) completed the entire study. The males in the video feedback group landed in a “softer” position compared to the controls: at peak knee valgus/varus they exhibited increased hip flexion, decreased dorsiflexion moment, and decreased vertical ground reaction force. The researchers did not find any differences between female athlete changes over time or between groups.
This is a unique study as it is one of the first studies to provide insight on an effective technique to correct movement patterns during a drop vertical jump in males. It is likely that the athletes in the video group focused on modifying the joints that displayed the greatest differences between his/her and the expert body’s contours. The males seemed to have matched the expert’s knee joint motion early in their exposure to the feedback, allowing the participants to explore their hip and ankle joints in an attempt to match all of the individual components of the movement. Females in the visual feedback group were able to imitate the expert, but the changes to their movement strategy did not alter their landing technique. Female athletes have been shown to respond to multifactorial feedback (i.e. visual and verbal) when being instructed on correct landing technique. These female participants may benefit from additional explanation of the task, viewing a 3D video, and/or viewing the video from multiple angles. Positive changes in knee position could be seen using a combination of feedback methods. Based on these results, medical professionals could consider appropriate use of video feedback to correct landing technique in males, as a “softer” landing technique may indicate a reduction in ACL injury risk. However, prior to implementing a specific tool or program, clinicians should utilize caution until appropriate validity and reliability has been achieved.
Question for Discussion: What type of instructions would you combine with visual feedback to correct a lower extremity faulty movement during a rehabilitation exercise? Should the rehabilitation exercises mimic exactly what you are testing (pre-test/post-test), or do you think you might get a different result using another exercise (high velocity vs. slow velocity)?
Written by: Ashley N. Marshall, M.Ed, ATC, CES, PES
Reviewed by: Jane McDevitt
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