EMG analysis of vastus medialis obliquus and vastus lateralis activities in subjects with anterior knee pain before and after a physiotherapy exercise programme

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EMG analysis of vastus medialis obliquus and vastus lateralis activities in subjects with anterior knee pain before and after a physiotherapy exercise programme

 

Author: Zhang, Qi Angie.
Title: EMG analysis of vastus medialis obliquus and vastus lateralis activities in subjects with anterior knee pain before and after a physiotherapy exercise programme
Degree: M.Sc.
Year: 2005
Subject: Hong Kong Polytechnic University -- Dissertations
Electromyography
Patellofemoral joint -- Wounds and injuries
Knee -- Wounds and injuries
Physical therapy
Department: Dept. of Rehabilitation Sciences
Pages: viii, 84 leaves : col. ill. ; 30 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b1968141
URI: http://theses.lib.polyu.edu.hk/handle/200/5422
Abstract: A study examining the efficacy of physiotherapy exercise programme on the muscle activities of vastus medialis obliquus (VMO) and vastus lateralis (VL) was performed. A total of 26 subjects diagnosed with patellofemoral pain syndrome (PFPS) without traumatic causes were studied. They were randomly assigned into 2 groups: 'EMG biofeedback + exercise group' (n=13) and 'exercise only group' (n=13). The 'EMG biofeedback + exercise group' received EMG biofeedback training and a physiotherapy exercise training programme, whereas the 'exercise only group' received a physiotherapy exercise training programme only. The muscle activities of both VMO and VL were assessed with surface EMG system for 6 hours during a normal day of activities. The intensity of the knee pain was also recorded on a pain severity scale (PSS). These parameters were measured before and after the study that lasted for 8 weeks. All subjects were examined by a physiotherapist who was blinded to the grouping of the subjects to determine the demographic data before the study. The procedures of application of the EMG system were standardized for all subjects. The data for analysis included the PSS scores and ratio of VMO/VL EMG activities. Data were analyzed with independent t-tests and the level of significance was set at 0.05. Results showed that significant difference in the VMO/VL EMG activity ratio over time was only observed in 'EMG biofeedback + exercise group', and this group demonstrated a greater change in VMO/VL EMG activity ratio than the 'exercise only group'. However, significant differences in VMO/VL EMG activities between the two groups were not statistically significant. This implies that a combination of EMG biofeedback with a physiotherapy exercise programme results in improvement of the relative VMO activities over time when compared with a physiotherapy exercise programme only in patients with PFPS.

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