fa آسیب شناسی ورزشی و حرکات اصلاحی Sport injury and corrective exercises پژوهشي Research <p style="text-align: justify;"><strong>Purpose:</strong> This study aimed to investigate the effect of genu varum abnormality on the activity of the anterior leg calf muscle during single-leg jump-landing task.&nbsp;<br> <strong>Methods:</strong> A total of 28 male students of Physical Education (Mean&plusmn;SD age: 21.53&plusmn;1.65 y, weight: 66.67&plusmn;7.15 kg, height: 173.38&plusmn;4.54 cm) were assigned into the genu varum (n=14) and normal knee (n=14) groups. Their level of activity of tibialis anterior muscle and ground reaction force were analyzed using an electromyography and force plate in single-leg jump-landing task. In order to analyze the data, the Independent t test was used at the significance level of P<0.05. In jump-landing task, the subjects were required to jump up to 50% of maximum vertical jump and land with one leg on the plate. Root-Mean Square (RMS) level of tibialis anterior muscle was calculated by MATLAB.&nbsp;<br> <strong>Results:</strong> The study results showed no significant differences between genu varum and normal knee groups (P>0.05) in the mean scores of the tibialis anterior muscular activity before and after landing.&nbsp;<br> <strong>Conclusion:</strong> In performing the jump-landing task, tibialis anterior muscular activity of the two groups was similar before and after floor contact. Therefore, activity of tibialis anterior muscle does not seem responsible for differences observed in the balance between people with genu varum and normal knee. In addition to biomechanical reasons, other muscles or muscle groups might responsible for weaker balance observed in people with genu varum.</p> Genuvarum, deformity, Tibialis anterior muscle, single-leg jump, Posture, Jump-landing 205 214 http://ptj.uswr.ac.ir/browse.php?a_code=A-10-249-2&slc_lang=fa&sid=1 Faraj Fatahi فرج فتاحی yosefmongashtijoni@gmail.com 0000-0002-0861-1469 Yes Department of Sport Injuries and Corrective Exercises, Faculty of Physical Education and Sport Sciences, University of Isfahan, Isfahan, Iran. دانشگاه اصفهان Yosef Mongashti Joni یوسف منگشتی جونی yosefmongashtijoni@gmail.com No Department of Sport Management, Faculty of Sport Sciences, Urmia University, Urmia, Iran. آموزش و پرورش Alireza Najafi No Department of Physical Education and Sport Sciences, Faculty of Physical Education and Sport Sciences, University of Isfahan, Isfahan, Iran. Eskandar Hossein Pour اسکندر حسین پور yosefmongashtijoni@gmail.com No Department of Sport Management, Faculty of Physical Education and Sports Sciences, University of Tehran, Tehran, Iran. دانشگاه علامه تهران