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Electromyographic Analysis of the Lower Extremities During Squatting: Effects of Changes in Sagittal Plane Center of Foot Pressure on Muscle Activity

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  • スクワット肢位における足圧中心位置の違いが下肢筋の筋活動に及ぼす影響

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The purpose of this study was to determine the influence of changes in the sagittal plane center of foot pressure (CFP) during squatting on the muscle activity of the lower extremities. Twelve healthy subjects with a mean age of 25.9 years, participated in this study. Electromyographic muscle activity during squatting was measured in the rectus femoris, vastus medialis, vastus lateralis, biceps femoris, semimembranosus, gastrocnemius and tibialis anterior. Squatting was performed at three knee joint flexion angles (30°, 60°and 90°), and three CFP positions (neutral, forward, backward). There were significant differences with changes in CFP in muscle activity of the rectus femoris, vastus medialis, vastus lateralis and tibialis anterior at all knee flexion angles. The highest muscle activity of these muscles was shown during squatting in backward CFP at the deep knee flexion angles. Muscle activity of the biceps femoris, semimembranosus and gastrocnemius tended to be higher in forward CFP, but was still low at less than 20 percent. These results suggest that squatting in backward CFP at deep knee flexion angles is most effective as muscle strengthening exercise for the quadriceps femoris and tibialis anterior.


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