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http://dx.doi.org/10.5953/JMJH.2010.17.2.142

Effects of Knee and Foot Position on EMG Activity and Ratio of the Vastus Medialis Oblique and Vastus Lateralis during Squat Exercise  

Kim, Hyun-Hee (Department of Physical Therapy, Sahmyook University)
Song, Chang-Ho (Department of Physical Therapy, Sahmyook University)
Publication Information
Journal of muscle and joint health / v.17, no.2, 2010 , pp. 142-150 More about this Journal
Abstract
Purpose: The purpose of this study was to examine EMG activities and VMO/VL ratio of the vastus medialis oblique, vastus lateralis, and rectus femoris during squat exercise (knee angle: 15, 45, and 60 degrees; tibial rotation: internal rotation, neutral, and external rotation). Methods: Twelve subjects performed squat exercise at each knee angle and tibial rotation while electromyographic (EMG) activity was collected. Statistical analysis consisted of two-way repeated measures analysis of variance with post hoc analysis. Results: There were significant main effects of knee angles and foot positions and interaction effect on EMG activities of vastus medialis oblique and vastus lateralis. VMO/VL ratios were significantly different by tibial rotations and there was an interaction effect. A neutral position produced significantly more VMO/VL activity ratio than that from internally rotated position and externally rotated position at 60 degrees. Conclusion: Considering the interaction effects for EMG activity across quadriceps muscles tested, the 60 degrees knee angle with a neutral foot position may provide the most effective condition for patients with acute patellofemoral syndrome.
Keywords
Electromyography; Quadriceps Muscle; Patellofemoral Pain Syndrome;
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