Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/11918
Title: Surface electrode placement affects the EMG recordings of the quadriceps muscles
Authors: Wong, YM
Ng, GYF 
Keywords: Electrode
Electromyography
Knee
Quadriceps muscle
Issue Date: 2006
Publisher: Churchill Livingstone
Source: Physical therapy in sport, 2006, v. 7, no. 3, p. 122-127 How to cite?
Journal: Physical therapy in sport 
Abstract: Objectives: This study examined the EMG activities of the medial and lateral vasti muscles with four different surface electrode positions during isometric knee extension and knee perturbation. Design: Repeated measures design. Setting: Orthopaedic rehabilitation laboratory of a university. Participants: Eight able-bodied non-athletic male volunteers. Main outcome measures: The relative onset time difference in milliseconds of vastus medialis obliquus (VMO) and vastus lateralis (VL) during knee perturbation, and the normalized EMG amplitude in root-mean-square ratio of VMO:VL during submaximal isometric knee extension were analyzed using repeated measures ANOVA. Results: Different electrode positions on VL resulted in different VMO-VL onset time (p = 0.002) and normalized VMO:VL activity ratios (p = 0.002, 0.014). Conclusions: The position of surface electrodes has significantly affected the EMG readings of the vasti muscles. This finding has vital clinical implications for the application of EMG measurement and biofeedback training for the rehabilitation of the vasti muscles.
URI: http://hdl.handle.net/10397/11918
ISSN: 1466-853X
DOI: 10.1016/j.ptsp.2006.03.006
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