The Effects of Closed Kinetic Chain Exercise Using EMG Biofeedback on PFPS Patients' Pain and Muscle Functions

Jae-Young Kang; Tae-Gon Kim; Kyung-Yoon Kim
June 2014
International Journal of Bio-Science & Bio-Technology;Jun2014, Vol. 6 Issue 3, p55
Academic Journal
This study aimed to examine the effects of closed kinetic chain exercise using electromyography (EMG) biofeedback for selective strengthening of the vastus medialis oblique (VMO) on patllofemoral joint pain and functional characteristics of patllofemoral joint muscles. The subjects of this study were 30 patellofemoral pain syndrome (PFPS) patients and they were equally and randomly assigned to a control group (I), a closed kinetic chain exercise group (II), and an EMG biofeedback closed kinetic chain exercise (III). They received intervention three times per week (for 30 minutes per each time) for six weeks. Measurement methods included visual analogue scale (VAS) and EMG. According to the study result, there were significant differences in groups II and III compared to group I in VAS (p<.01). During a squat position, there were significant differences in groups II and III compared to group I in median frequency (MDF) and VMO/vastus lateralis (VL) muscle activity ratios (p<.05). According to the this study result, PFPS patients' muscle functions improved by enhancing muscle control and response ability using EMG biofeedback with which real-time bioinformation on the muscles is provided during closed kinetic chain exercise in order to raise treatment efficiency.


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