Center for Human Movement Sciences, University Medical Center Groningen, University of Groningen, the Netherlands.
School of Sport Studies, Hanze University Groningen, the Netherlands.
J Athl Train. 2017 Nov;52(11):993-1001. doi: 10.4085/1062-6050-52.10.11. Epub 2017 Oct 16.
In team handball, an anterior cruciate ligament injury often occurs during landing after a jump shot. Many intervention programs try to reduce the injury rate by instructing athletes to land more safely. Video is an effective way to provide feedback, but little is known about its influence on landing technique in sport-specific situations.
To test the effectiveness of a video-overlay feedback method on landing technique in elite handball players.
Controlled laboratory study.
Laboratory.
A total of 16 elite female handball players assigned to a control group (n = 8; age = 17.61 ± 1.34 years, height = 1.73 ± 0.06 m, mass = 69.55 ± 4.29 kg) or video group (n = 8; age = 17.81 ± 0.86 years, height = 1.71 ± 0.03 m, mass = 64.28 ± 6.29 kg).
INTERVENTION(S): Both groups performed jump shots in a pretest, 2 training sessions, and a posttest. The video group received video feedback of an expert model with an overlay of their own jump shots in training sessions 1 and 2, whereas the control group did not.
MAIN OUTCOME MEASURE(S): We measured ankle, knee, and hip angles in the sagittal plane at initial contact and peak flexion; range of motion; and Landing Error Scoring System (LESS) scores. One 2 × 4 repeated-measures analysis of variance was conducted to analyze the group, time, and interaction effects of all kinematic outcome measures and the LESS score.
The video group improved knee and hip flexion at initial contact and peak flexion and range of motion. In addition, the group's average peak ankle flexion (12.0° at pretest to 21.8° at posttest) and LESS score (8.1 pretest to 4.0 posttest) improved. When we considered performance variables, no differences between groups were found in shot accuracy or vertical jump height, whereas horizontal jump distance in the video group increased over time.
Overlay visual feedback is an effective method for improving landing kinematics during a sport-specific jump shot. Further research is warranted to determine the long-term effects and transfer to training and game situations.
在团队手球中，前交叉韧带损伤通常发生在跳投后落地时。许多干预计划试图通过指导运动员更安全地着陆来降低受伤率。视频是提供反馈的有效方式，但对于其对手球特定情况下着陆技术的影响知之甚少。
测试视频叠加反馈方法在手球精英运动员中的着陆技术效果。
对照实验室研究。
实验室。
总共 16 名精英女性手球运动员分为对照组（n=8；年龄=17.61±1.34 岁，身高=1.73±0.06m，体重=69.55±4.29kg）或视频组（n=8；年龄=17.81±0.86 岁，身高=1.71±0.03m，体重=64.28±6.29kg）。
两组均在预测试、2 次训练和后测试中进行跳投。视频组在前两次训练中接受了专家模型的视频反馈，并叠加了自己的跳投，而对照组则没有。
我们测量了矢状面初始接触和峰值屈曲时踝关节、膝关节和髋关节的角度；运动范围；以及着陆错误评分系统（LESS）评分。进行了 1 次 2×4 重复测量方差分析，以分析所有运动学结果测量和 LESS 评分的组、时间和交互效应。
视频组改善了初始接触和峰值屈曲时的膝关节和髋关节屈曲以及运动范围。此外，该组的平均峰值踝关节屈曲（从预测试的 12.0°到后测试的 21.8°）和 LESS 评分（从 8.1 个预测试到 4.0 个后测试）均有所提高。当我们考虑表现变量时，组间在射门准确性或垂直跳跃高度方面没有差异，而视频组的水平跳跃距离随着时间的推移而增加。
叠加视觉反馈是一种改善特定运动跳投时着陆运动学的有效方法。需要进一步研究以确定长期效果并转移到训练和比赛情况。
