title: Innovative Video Feedback on Jump Landing Improves Landing Technique in Males.
abstract: 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.
authors.affiliation: Center for Human Movement Sciences, University of Groningen, University Medical Center Groningen, Groningen, Netherlands.
authors.forename: Joan
authors.initials: J
authors.lastname: Dallinga
authors.affiliation: Center for Human Movement Sciences, University of Groningen, University Medical Center Groningen, Groningen, Netherlands.
authors.forename: Anne
authors.initials: A
authors.lastname: Benjaminse
authors.affiliation: Center for Human Movement Sciences, University of Groningen, University Medical Center Groningen, Groningen, Netherlands.
authors.forename: Alli
authors.initials: A
authors.lastname: Gokeler
authors.affiliation: School of Recreation, Health and Tourism, George Mason University, Fairfax, United States.
authors.forename: Nelson
authors.initials: N
authors.lastname: Cortes
authors.affiliation: Center for Human Movement Sciences, University of Groningen, University Medical Center Groningen, Groningen, Netherlands.
authors.forename: Egbert
authors.initials: E
authors.lastname: Otten
authors.affiliation: Center for Human Movement Sciences, University of Groningen, University Medical Center Groningen, Groningen, Netherlands.
authors.forename: Koen
authors.initials: K
authors.lastname: Lemmink
mesh_terms: D000328:Adult; D000843:Ankle Joint; D000070598:Anterior Cruciate Ligament Injuries / Q000517:prevention & control; D056352:Athletes; D054874:Athletic Performance; D001696:Biomechanical Phenomena; D005246:Feedback; D005260:Female; D006621:Hip Joint; D006801:Humans; D007719:Knee Joint; D008297:Male; D064797:Physical Conditioning, Human / Q000379:methods*; D016059:Range of Motion, Articular; D014741:Video Recording; D055815:Young Adult