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KMID : 0357220080200030029
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Journal of Korean Society Physical Therapy
2008 Volume.20 No. 3 p.29 ~ p.34
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Effect of the Resistance Direction by an Elastic Band on the VMO/VL Electromyographic Activity Ratio during Dynamic Squat Exercise
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Nam Ki-Suk
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Abstract
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Purpose: The purpose of this study was to identify the effect of anterolateral (45) and lateral (90) direction resistance, with using an elastic band, on the electromyographic(EMG) activity ratio of the vastus medialis oblique (VMO) and the vastus lateralis (VL) during squat exercise.
Methods: The study subjects were 19 active people with no history of patellofemoral pain, limitation of range of motion or pain when performing squat exercise. A ’repeated measures within subjects’ design was used. The subjects were asked to perform three repetitions of a 90 knee flexion squat exercise with anterolateral (45) and lateral (90) resistance and without resistance, respectively. The EMG activity of the VMO and VL were recorded by surface EMG electrodes and the results were normalized by the % MVIC value.
Results: Repeated measures ANOVA’s revealed that squat exercise with anterolateral (45) resistance produced significantly greater VMO/VL EMG activity ratio than that with lateral (90) resistance and without resistance (p=.013). Yet the result of contrast testing revealed that squat exercise with lateral (90) resistance showed no significant difference of the VMO/VL EMG activity ratio, as compared with squat exercise without resistance (p>0.05).
Conclusion: The findings of this study suggest that squat exercise combining anterolateral (45) resistance can contribute positively to the patients with patellofemoral pain as they increase the VMO/VL EMG activity ratio.
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KEYWORD
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Patellofemoral pain, Squat exercise, Surface electromyography, VMO/VL ratio
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