Journal for Research in Sport Rehabilitation

Journal for Research in Sport Rehabilitation

Investigating the Immediate Effect of Dynamic Knee Valgus Correction on Athletes' Jumping Performance During the Stop-Jump Task: A Cross-Sectional Study

Document Type : Research Paper

Author
Ramin Balouchy
Associate Professor, Department of Sport Injuries and Corrective Exercises, Faculty of Physical Education, Allameh Tabataba’i University, Tehran, Iran.
10.22084/rsr.2024.29307.1740
Abstract
Background and Aim: The effectiveness of the immediate augmented feedback on biomechanical risk factors is well established, but its relationship to athletes' plyometric performance remains unknown synchronously. Therefore, the purpose of this investigation was to determine if the immediate dynamic knee valgus (DKV) correction would affect the stop-jump Performance.
Methods: Twenty-one male recreational athletes with DKV participated in this investigation. Three-dimensional kinematics, force plate, and electromyography data were synchronously collected before and after augmented feedback-based immediate DKV correction during stop-jump task. The jumping performance was calculated by using the reactive strength index-modified (RSImod).
Results: The subjects in post-intervention significantly decreased adduction and internal rotation of the hip and increased maximum knee flexion during stop-jump task, which was accompanied by reduced vastus lateralis (VL), gluteus medius (Gmed), and tensor fasciae latae (TFL) muscles activity in the eccentric phase. Moreover, the subjects in post-intervention significantly increased time to take-off, accompanied by a decrease in RSImod.
Conclusion: Our findings exhibited that augmented feedback-based immediate DKV correction had a negative impact on athletes' jumping performance during the stop-jump task based on the RSImod index, as indicated by increased time to take off. This was probably due to increased maximum knee flexion and neuromuscular performance insufficiency.
Keywords
Reactive strength index
Plyometric
Augmented feedback
Force plate
Landing
Subjects