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Asian J Kinesiol > Volume 15(3); 2013 > Article
The Official Journal of the Korean Academy of Kinesiology 2013;15(3):25-33.
DOI: https://doi.org/10.15758/jkak.2013.15.3.25     Published online July 31, 2013.
Comparison of Muscle Activity of Vastus Medialis Oblique, Vastus Lateralis, and Gluteus Medius Following Closed Kinetic Chain Exercise
Sang-Hyup Song
Song, Sang-Hyup
Dankook University
Correspondence:  Sang-Hyup Song,
Email: yo-hyup@hanmail.net
Received: 27 June 2013   • Accepted: 20 July 2013

Patellofemoral pain syndrome (PFPS) is one of the most common musculoskeletal disorders. However, no consensus on the definition, classification, assessment, diagnosis, or management has been reached. PFPS is a problem among adolescents and young adults, characterised by retropatellar pain (behind the kneecap) or peripatellar pain (around the kneecap) when ascending or descending stairs, squatting or sitting with flexed knees. PFPS is the result of imbalance between the VMO and VL and weaken GM. The purpose of this study was to compare of lower extremity muscle activation during three closed-kinetic-chain (CKC) exercises.
Eight healthy adult men were randomly performed to Traditional squat (TS : n=8), Squat with isometric adduction (SIHA : n=8) or Single leg squat (SLS : n=8). The surface electromyography (EMG) activity ratio of VMO and VL and EMG activity of GM was measured during 3 second concentric contraction and 3 second eccentric contraction in 3 CKC exercises.
EMG activity ratio of VMO and VL significantly higher in SLS and SIHA exercise than in TS exercise (P=.05). Similarly, greater EMG activity of GM was significantly higher indicated in SLS and SIHA exercises than in TS exercise (P=.05).
Squat with isometric hip adduction (SIHA) and single limb squat exercise (SLS) induces greater VMO : VL ratio and muscle activity of GM. It is thought that there is a need to develop training methods to be applied in the field of sports in the future.
Keywords: Closed Kinetic Chain Exercis, Vastus Medialis Oblique, Vastus Lateralis, Gluteus Medius, Muscle Activity
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