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Introduction: Plyometric training via neuromuscular adaptations to the stretch reflex, elasticity of muscle and Golgi tendon organs has an important role in pre-activation of muscles. Due to lack of research in regard to effect of plyometric training on lumbo pelvic muscle, this study aimed to investigate the effect of plyometric training on lumbo pelvic muscle pre-activation in active females with trunk control deficit. Methods: Twenty-five active females who suffered from trunk control deficit with the mean age of 19.09±1.38 yr, weight of 58.67±3.37 kg and height of 162.73±3.88 cm participated in this study. They were divided into two groups of experimental and control. Before and after 6 weeks of plyometric training, electromyography of Gluteus Medius, Quadratus Lumborum, Transverse Abdominis/Internal oblique, and external Oblique was performed in single leg drop landing and pre-activitation of muscles was calculated. Results: the results of independent sample T-test indicated that there are significant differences between post-test of control and experimental groups in regard to Gluteus Medius (p=0.021), Quadratus Lumborum (p=0.011), Transverse Abdominis/Internal oblique (p=0.006), External Oblique (p=0.023) muscles activations which reveals effectiveness of plyometric training on pre-activation of muscles. Conclusion: Based on the study results, plyometric training affects the activation of muscles and thus improving the pre-activation can prevent mechanisms related to anterior cruciate ligament injury. Therefore, plyometric training can reduce incidence of anterior cruciate ligament injury.

Keywords: Active Female, Anterior Cruciate Ligament Injury, Plyometric Training, Trunk Control Deficit

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