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KMID : 0123520100170020142
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Journal of muscle and joint health
2010 Volume.17 No. 2 p.142 ~ p.150
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Effects of Knee and Foot Position on EMG Activity and Ratio of the Vastus Medialis Oblique and Vastus Lateralis during Squat Exercise
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Kim Hyun-Hee
Song Chang-Ho
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Abstract
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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 vastuslateralis. oblique and vastuslateralis. 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.
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KEYWORD
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Electromyography, Quadriceps Muscle, Patellofemoral Pain Syndrome
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