Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22948
Title: EMG analysis of vastus medialis obliquus/vastus lateralis activities in subjects with patellofemoral pain syndrome before and after a home exercise program
Authors: Zhang, Q
Ng, GYF 
Keywords: Electromyographic biofeedback
Patellofemoral pain syndrome
Vastus lateralis
Vastus medialis obliquus
Issue Date: 2007
Source: Journal of physical therapy science, 2007, v. 19, no. 2, p. 131-137 How to cite?
Journal: Journal of Physical Therapy Science 
Abstract: The objective of this study was to analyze the effects of an 8-week home exercise program with and without electromyographic biofeedback on the relative activations of the vastus medialis obliquus and vastus lateralis using electromyographic measurement in patients with patellofemoral pain syndrome. Twenty-six subjects were randomly allocated into "exercise only" (Group 1) and "electromyographic biofeedback + exercise" (Group 2) groups. Both groups performed the same exercise program and Group 2 received electromyographic biofeedback from a system that provided real-time information on the relative activations of the vastus medialis obliquus and vastus lateralis during the exercises. The intensity of the knee pain was also recorded on a pain severity scale, respectively. These parameters were measured before and after the 8-week home exercise program. The results show that Group 1 had insignificant changes in the vastus medialis obliquus/vastus lateralis electromyographic ratio (p=0.355), whereas Group 2 had significantly a higher vastus medialis obliquus/vastus lateralis electromyographic ratio (p=0.017) when performing normal activities throughout a 6-hour assessment period. The present results reveal that the incorporation of electromyographic biofeedback into a home exercise program could facilitate the activation of the vastus medialis obliquus muscle, such that the muscle could be preferentially recruited during daily activities.
URI: http://hdl.handle.net/10397/22948
ISSN: 0915-5287
DOI: 10.1589/jpts.19.131
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