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KMID : 1034620170070010007
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Korean Journal of Neuromuscular Rehabilitation
2017 Volume.7 No. 1 p.7 ~ p.13
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Comparison of the Activation of Qudriceps during Open- and Closed-Kinetic Chain Exercises in Various Knee Joint Angles
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Ko Jae-Sik
Kim Na-Hye
Lee Eun-Chul
Jung So-Yeon
Heo Jin-Kang
Kim Soo-Min
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Abstract
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The purpose of this study was to investigate the electromyographic (EMG) activity of vastus medialis (VM), vastus lateralis (VL), and rectus femoris (RF) during open kinetic chain exercise (OKC) and close kinetic chain (CKC) exercise at various angle of the knee joint. 11 normal subjects (6 men, 5 women) participated. Root mean square (RMS) of the vastus medialis (VM), vastus lateralis (VL), and rectus femoris (RF) was measured by the surface EMG during CKC and OKC exercise at 0°, 45°, and 90° of knee joint. In isotonic contraction of knee extension, RMS of the VL was more increased than the VM and RF during CKC and OKC exercise. In isometric contraction during OKC, RMS of RF was more increase than the VL and VL at 0°and 45°. RMS of the VL was more increased than the RF and VM at 90°. In isometric contraction during CKC, RMS of the VM was more increase than the VL and RF at 0°, 45°, and 90° of knee joint. These findings suggest that isometric contraction of knee using CKC may be more favorable to increase activity of the VM.
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KEYWORD
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Closed kinetic chain, Electromyography, Open kinetic chain, Quadriceps
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