J Korean Phys Ther.  2020 Oct;32(5):273-276. 10.18857/jkpt.2020.32.5.273.

Comparison of the VMO/VL EMG Activity Ratio According to Resistance Condition in Partial Lunge Exercise

• Nam KS

• KMID: 2520086
• DOI: http://doi.org/10.18857/jkpt.2020.32.5.273

Abstract

Purpose
The purpose of this study was to investigate the effects of the resistance conditions on the electromyography (EMG) activity ratio of vastus medialis oblique (VMO) and vastus lateralis (VL) muscle during partial lunge exercise in healthy subjects in order to suggest the basic data of exercise intervention for such as patients with patellofemoral pain syndrome (PFPS).
Methods
The participants of this study were healthy twenty two people with no knee pain, limitation of motion and past history of operation at lower extremity. The participants performed three types of lunge 1) no resistance, 2) anterolateral 45° resistance and 3) lateral 90° respectively. The EMG activity of the VMO and VL were recorded by surface EMG and the measured data normalized by the %MVIC value was analyzed by repeated measured ANOVA.
Results
The results showed that the VMO/VL EMG activity ratio during lunge with anterolateral 45° resistance was significantly higher than with no resistance and lateral 90° resistance (p<0.05). There was no significant difference in VMO, VL, and VMO/VL muscle activity between male and female subjects (p>0.05).
Conclusion
This study suggests that partial lunge exercise with anterolateral 45° resistance can increase the VMO/VL muscle activity in healthy subjects. This result could be used as basic data to develop therapeutic exerc

Keyword

VMO/VL ratio; Lunge exercise; Patellofemoral pain