Dallinga Joan, Benjaminse Anne, Gokeler Alli, Cortes Nelson, Otten Egbert, Lemmink Koen
Center for Human Movement Sciences, University of Groningen, University Medical Center Groningen, Groningen, Netherlands.
School of Recreation, Health and Tourism, George Mason University, Fairfax, United States.
Int J Sports Med. 2017 Feb;38(2):150-158. doi: 10.1055/s-0042-106298. Epub 2016 Jul 18.
Video feedback may be a powerful tool to change biomechanical landing patterns associated with anterior cruciate ligament (ACL) injury risk. This study investigated the effect of video feedback on drop vertical jump (DVJ) landing strategies in team sport athletes. 59 athletes were assigned to a video feedback (VI) or control (CTRL) group. A pretest, 2 training sessions and a posttest were conducted. In both training sessions, video feedback, consisting of a video of the athlete's contour superimposed onto an expert's contour performing the DVJ landing task, was provided to the VI group; the CTRL group did not receive feedback. Outcomes included: kinematics and kinetics at peak knee valgus/varus moment during pre- and posttest and percentage overlap of expert and athlete during the training sessions. At posttest, males in the VI group showed greater hip flexion angles (p=0.001) and range of motion (p<0.001), smaller vertical ground reaction force, and smaller ankle dorsiflexion moment (p<0.001) compared to pretest. At posttest, males in the VI group demonstrated smaller vertical ground reaction force (p=0.031) and ankle dorsiflexion moment (p=0.001) compared to males in the CTRL group. The VI group increased percentage overlap with the expert during training sessions and from start of the first to the end of the second training session (p<0.001). Overall, video feedback was effective to modify landing strategies favorably in males. While females imitated the expert model, their landing strategy did not change significantly. While Females may need additional (verbal) feedback to benefit from video feedback.
视频反馈可能是一种强大的工具，可用于改变与前交叉韧带（ACL）损伤风险相关的生物力学着陆模式。本研究调查了视频反馈对团队运动运动员垂直跳（DVJ）着陆策略的影响。59名运动员被分配到视频反馈（VI）组或对照组（CTRL）。进行了一次预测试、两次训练课程和一次后测试。在两次训练课程中，向VI组提供视频反馈，即运动员轮廓视频叠加在执行DVJ着陆任务的专家轮廓上；CTRL组未收到反馈。结果包括：预测试和后测试期间膝关节内翻/外翻峰值时刻的运动学和动力学，以及训练课程期间专家与运动员的重叠百分比。在后测试中，与预测试相比，VI组男性表现出更大的髋关节屈曲角度（p = 0.001）和运动范围（p < 0.001）、更小的垂直地面反作用力和更小的踝关节背屈力矩（p < 0.001）。在后测试中，与CTRL组男性相比，VI组男性表现出更小的垂直地面反作用力（p = 0.031）和踝关节背屈力矩（p = 0.001）。VI组在训练课程期间以及从第一次训练开始到第二次训练结束时与专家的重叠百分比增加（p < 0.001）。总体而言，视频反馈有效地改善了男性的着陆策略。虽然女性模仿了专家模型，但她们的着陆策略没有显著变化。女性可能需要额外的（口头）反馈才能从视频反馈中受益。
