کارگروه اخلاق در پژوهش

Comparison of the Effect of Movement Anticipation on Lower Limb Kinematics, Kinetics, and Electromyographic Activity During Jump-Landing-Jump in Adolescent Male Athletes With and Without Dynamic Knee Valgus.

Approved Proposals

Document Type : Original Article

Researchers

Shima Malekpoor
Rahman Sheikhhoseini

Sport Injury and Corrective Exercise, Faculty of Physical Education and Sport Sciences, Allameh Tabataba’i University, Tehran, Iran

https://doi.org/10.22054/ethics.2026.95282.1654
Ministerial Ethics Committee
1. Introduction & Problem Statement

Adolescent sports participation increases lower-limb injury risk, especially anterior cruciate ligament (ACL) tears. Dynamic knee valgus (DKV) is a key biomechanical risk factor during jump-landing tasks. Movement anticipation can reduce impact forces through early muscle pre-activation, but under unanticipated conditions, adolescent athletes with DKV may face greater neuromuscular challenges. The combined effect of anticipation and DKV has not been studied in adolescent male athletes.



2. Objectives & Hypotheses

The study compares the effect of movement anticipation on lower-limb kinematics, kinetics, and EMG activity during a jump-land-jump task in adolescent male athletes with and without DKV. It is hypothesized that significant differences exist between groups under anticipated versus unanticipated conditions.



3. Methodology

Thirty adolescent male athletes (15–18 years) from Karaj will be classified into DKV and non-DKV groups (n=15 each) using the single-leg squat FPPA test. A 2×2 mixed factorial design (between: DKV/non-DKV; within: anticipated/unanticipated) will be used. 3D kinematics, ground reaction forces, and surface EMG will be recorded and analyzed via three-way mixed ANOVA.



4. Significance & Application

Findings will provide a scientific basis for more precise screening tools and ACL injury-prevention protocols for adolescent male athletes — a population underrepresented in prior research, which has mainly focused on adults and female athletes.

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