IRCT2017011732008N1 IRCT 2017-07-11 Bu_Ali Sina University Training Effect with EMG Biofeedback on Patella femoral Pain Syndrome The Effects of a Strengthening Exercise Program with EMG Biofeedback to Correct Patellar Alignment and Reduces Knee Pain in Women with Patella femoral Pain Syndrome 2015-01-01 anticipated 22 Complete https://irct.ir/trial/25036 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Health service research. N/A Patello femoral disorders. Intervention 1: Intervention group 1: Strengthening Exercises for knee extensors These exercises were performed in both experimental groups (I and II) equally. The control group remained sedentary. The aim of these exercises were to increase the strength of the vastus medialis more than that of the vastus lateralis. Exercises were performed within 18 session with 3 sessions (1.5 hours each session) per week, lasting for 6 weeks. In the first week, each session were including 3 sets of 10 repetitions (10 seconds each repetition) and the intensity of exercises were increased so that it reached to 5 sets of 30 repetitions at the last week. Intervention 2: Intervention group 2: Biofeedback. During the exercises, individuals in one of the experimental groups (Experimental I) received biofeedback about the electrical activity of vastus medialis and lateralis. The second experimental group, as well as the control group did not receive any biofeedback. This biofeedback was including an online figure about the peak electromyography signals of the vastus medialis and lateralis muscles online during the exercise and the subject was advised to change her foot position so that the peak value of electrical activity of the target muscle (Vastus medialis) had the largest possible difference with the other muscle.