Introduction: After reconstructing the anterior cruciate ligament, to prevent re-injury of the ligament, evaluation of neuromuscular function is of clinical importance in coordinating the onset time and time to peak of lower limb's muscles activity. Aim: Therefore, the purpose of this study was to compare the timing of muscle activity in the stance phase of running between athletes with reconstructed anterior cruciate ligament and healthy subjects. Methods: This study was a semi-experimental and applied type. Ten athletes with reconstructed anterior cruciate ligament who at least one year had passed since their surgery, as experimental group and ten healthy subjects as the control group of Hamedan city were volunteered to participate in the study. The control group, in terms of age, height, and weight, were homological with the experimental group. The surface electromyography system was used to quantify the onset time and time to peak of the lower limb's muscle activity. Multivariate MANOVA, with a significance level of P < 0.05, was used for statistical analysis. Results: In the experimental group, the onset of the activity in tibialis anterior, medial gastrocnemius, vastus medialis, vastus lateralis, gluteus medius (P = 0.001), as well as the time to peak in tibialis anterior, vastus lateralis, vastus medialis, gluteus medius, semitendinosus (P = 0.001) and biceps femoris (P = 0.045), were delayed. Conclusions: During the stance phase of running, the experimental group displayed a delay in the activation onset and a longer time to peak in the lower limb's muscles. It is not clear if these changes are due to a neuromuscular adaptation or proprioception related damage. A more comprehensive study is recommended to clarify this aspect. It is recommended to assess the possible link between these delays with the reoccurrence of anterior cruciate ligament rupture.
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