The Effects of Closed Kinetic Chain Exercises and Open Kinetic Chain Exercises Using Elastic Bands on Electromyographic Activity in Degenerative

Abstract. [Purpose] The purpose of this study was to examine the effects of closed kinetic chain exercises (CK-CEs) and open kinetic chain exercises (OKCEs) with elastic bands on the electromyographic activity of patients with degenerative gonarthritis. [Subjects] The study subjects were 30 degenerative gonarthritis patients who were divided into a CKCE group (CKCEG, n=10), an OKCE group (OKCEG, n=10), and a control group (CG, n=10). [Methods] The CKCEG and the OKCEG performed exercises with elastic bands, and the CG took part in a quad-riceps strengthening exercise. All three groups performed the exercises three times per week for four weeks. The electromyographic activities of the subjects ’ vastus medialis (VM), rectus femoris (RF), vastus lateralis (VL), semi-tendinosus (ST), and biceps femoris (BF) muscles were measured and compared. [Results] Within-group compari-sons revealed that the electromyographic activities of the VM, RF, VL, ST, and BF muscles increased significantly in the CKCEG. The OKCEG displayed significant increases in the electromyographic activity of the VM, RF, ST, and BF muscles, and the CG showed significant increases in the electromyographic activities of the RF, VL, ST, and BF muscles. In between-group comparisons after the intervention, the electromyographic activities of the VM, RF, and VL muscles of the CKCEG were significantly higher than those of the CG. The electromyographic activities of the VM, RF, and ST muscles of the OKCEG were significantly higher than those of the CG. [Conclusion] We con-sider CKCEs with elastic bands are an effective intervention for increasing the electromyographic activities of th