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KMID : 1002720120100030025
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Journal of Korean Proprioceptive Neuromuscular Facilitation Association
2012 Volume.10 No. 3 p.25 ~ p.31
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Comparison of Changes in the Muscle Activity of the Quadriceps Femoris Muscle in Relation to the Angles of the Knee Joint on Closed Kinetic Chain
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An Seong-Ja
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Abstract
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Purpose : This study was intended to compare muscle activity in relation to knee joint angles on closed kinetic chain.
Methods : A total of 13 subjects consisting of 5 adult males and 8 adult females were made to make movements maintaining knee joint angles at 30°, 45° and 90° on closed kinetic chain and the muscle activity occurring in their vastus medialis, rectus femoris and vastus lateralis was measured. Statistical data were analyzed using oneway ANOVA.
Results : On closed kinetic chain, the muscle activity of the vastus medialis, rectus femoris and vastus lateralis increased the most at 90° among the knee joint angles with statistically significant differences(p<0.05).
Conclusion : On closed kinetic chain, it could be seen that as the angle of the knee joint increased, the muscle activity increased.
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KEYWORD
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Closed kinetic chain, Knee joint angle, Quadriceps muscle
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