fa عمومى General پژوهشي Research <div style="text-align: justify;"><strong>Purpose</strong>: Considering the high prevalence of dynamic valgus and its impact on sports performance among the female athletes, the present study aimed to examine the effect of a course of selective plyometric training on the lower extremity functional performance indexes of female athletes with dynamic knee valgus.<br> <strong>Methods</strong>: This research was a quasi-experimental study with a pretest-post-test design. The study population comprised the athletic girls with dynamic valgus referring to Bu-Ali Sina gymnasium of the University of Hamadan in 2018. Of them, 26 eligible girls who met the inclusion criteria were selected purposefully and then randomly assigned into experimental (Mean&plusmn;SD age=20.25&plusmn;2.34 y, Mean&plusmn;SD BMI=21.27&plusmn;2.75 kg/m2) and control (Mean&plusmn;SD age=21.16&plusmn;2.79 y, Mean&plusmn;SD BMI=21.60&plusmn;2.68 kg/m2) groups. The experimental group performed specific plyometric training for 8 weeks, 3 times a week. Assessing the dependent variable was done using dynamic balance, Sargent and Illinois Agility tests in the pretest and post-test. The comparisons between experimental and control groups in the pretest and post-test were made by analysis of covariance and the dependent t-tests, respectively in SPSS V. 20. The significance level was set at 0.05 or lower.<br> <strong>Results</strong>: Considering the pretest as the covariate parameter, a significant improvement was found for total dynamic balance (P=0.005), anterior leg (P=0.001), medial-posterior leg (P=0.001), lateral-posterior side of right leg (P=0.028), vertical jump (P=0.001) and Illinois jumping test score (P=0.001) in the experimental group.<br> <strong>Conclusion</strong>: An improvement was seen in the dynamic balance and the movement performance of the participants with dynamic valgus after doing plyometric exercises that result in subsequent improvement in their exercise performance.</div> Dynamic balance, Plyometric training, Valgus 31 38 http://ptj.uswr.ac.ir/browse.php?a_code=A-10-406-1&slc_lang=fa&sid=1 Farzaneh Saki f_saki@basu.ac.ir 0000-0003-3105-7520 No Department of Sport Injuries and Corrective Exercise, Faculty of Sport Sciences, Bu-Ali Sina University, Hamadan, Iran. Maryam Madhosh parisasedaghati@yahoo.com 0000-0003-3105-7520 No Department of Sport Injuries and Corrective Exercise, Faculty of Sport Sciences, Bu-Ali Sina University, Hamadan, Iran. Parisa Sedaghati parisasedaghati@yahoo.com 0000-0003-3627-1737 Yes Department of Sport Injuries and Corrective Exercise, Faculty of Physical Education and Sport Sciences, University of Guilan, Rasht, Iran.