title: Modifying spike jump landing biomechanics in female adolescent volleyball athletes using video and verbal feedback.
abstract: Landing awkwardly from a jump is a common mechanism of injury for the anterior cruciate ligament (ACL) of the knee. Augmented feedback, such as verbal or visual instruction, has been shown to cause an immediate, positive change in landing biomechanics in a laboratory setting. No data exist on the longer term effects of feedback on jump landing biomechanics in a sports-specific setting. The purpose of this study was to explore whether providing video and verbal feedback to adolescent (12-14 years old) female volleyball athletes would improve their landing technique. Trunk and lower extremity kinematic variables were measured in 19 participants before a feedback session was provided to the intervention group (IG). Follow-up kinematic measurements of the IG were taken immediately postintervention, and again after 2 and 4 weeks. Two-way repeated measures analysis of variance (ANOVA) was used to compare the IG with a control group (CG), who received no feedback. The IG (n = 10) demonstrated increased maximal hip and trunk flexion compared with the CG (n = 9) at week 4 (p ≤ 0.05). One-way repeated measures ANOVA was used to determine if changes were evident within the IG over time. Ankle dorsiflexion, right knee and hip flexion, and trunk flexion changed significantly (p ≤ 0.05) over the 4-week period. Augmented feedback appeared to produce a positive change in landing biomechanics in adolescent female volleyball athletes performing a sports-specific skill. Courtside video and verbal feedback may present a relatively simple, cost-effective method of introducing one component of a comprehensive ACL injury prevention program at a young age.
authors.affiliation: Applied Health Sciences Program, University of Manitoba, Winnipeg, Manitoba, Canada. umparso3@cc.umanitoba.ca
authors.forename: Joanne L
authors.initials: JL
authors.lastname: Parsons
authors.forename: Marion J L
authors.initials: MJ
authors.lastname: Alexander
mesh_terms: D000293:Adolescent; D056352:Athletes; D001676:Biofeedback, Psychology / Q000379:methods*; D001696:Biomechanical Phenomena; D002648:Child; D005260:Female; D006801:Humans; D007718:Knee Injuries / Q000517:prevention & control; D035002:Lower Extremity / Q000502:physiology; D009068:Movement / Q000502:physiology*; D014741:Video Recording; D054798:Volleyball / Q000502:physiology*