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KMID : 1142420180160010125
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PNF and Movement
2018 Volume.16 No. 1 p.125 ~ p.132
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Isolated Activation Ratio of the Quadriceps Femoris Muscle on Different Support Surfaces During Squat Exercise
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Kim Yong-Hun
Kim Byeong-Jo
Park Du-Jin
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Abstract
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Purpose: The aim of this study was to investigate the isolated activation ratio of the quadriceps femoris muscle on different support surfaces during squat exercise.
Methods: Twenty participants (10 males and 10 females) voluntarily agreed to participate in the research after receiving an explanation about the purpose and process of the study. Each participant performed squat exercises on three different support surfaces (a flat surface, a form roller, and an unstable surface). Muscle activities of the rectus femoris (RF), vastus medialis (VM), and vastus lateralis (VL) were measured by electromyography. The isolated activation ratio of the quadriceps femoris muscle was calculated using the %isolation formula.
Results: For the squat exercise, the %isolation value of the VM was significantly higher on the unstable surface than on the flat surface and form roller. In contrast, the %isolation values for the RF for the squat exercise were significantly higher on the flat surface and form roller than on the unstable surface. There was no significant differences in the %isolation values of the VL on the three different surfaces.
Conclusion: The findings indicate that squat exercise on different surfaces results in differential activation of the quadriceps femoris muscle, which suggests that squat exercise on a multi-directional unstable surface could increase the isolated activation ratio of the VM.
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KEYWORD
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%isolation, Quadriceps femoris muscle, Unstable surfaces, Electromyography
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