Effects of Open and Closed Kinetic Chains of Sling Exercise Therapy on the
Muscle Activity of the Vastus Medialis Oblique and Vastus Lateralis |
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Authors: | Wen-Dien Chang Wei-Syuan Huang Chia-Lun Lee Hung-Yu Lin Ping-Tung Lai |
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Institution: | 1) Department of Sports Medicine, China Medical University, Taiwan;2) Physical Education Section of General Education, National Sun Yat-sen University, Taiwan;3) Department of Occupational Therapy, I-Shou University, Taiwan;4) Department of Physical Therapy and Rehabilitation, Da-Chien General Hospital, Taiwan |
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Abstract: | Purpose] The muscle strength of the quadriceps muscle is critical in patellofemoral pain
syndrome. The quadriceps muscle supplies the power for dynamic patellar movement, and the
vastus medialis oblique (VMO) and vastus lateralis (VL) enable the patella to stabilize
during tracking. We followed the theories about open and closed kinetic chain exercises to
design two exercises, sling open chain knee extension (SOCKE) exercise and sling closed
chain knee extension (SCCKE) exercise. The purpose of our study was to research the
changes in quadriceps muscle activity during both exercises. Methods] Electromyographic
analysis was used to explore the different effects of the two exercises. The MVC% was
calculated for the VMO and VL during exercise for analysis. Results] We found that the
mean MVC% values of the VMO and VL during the SOCKE exercise were higher than those during
the SCCKE exercise. The ratio of the VMO to VL was 1.0 ± 0.19 during the SOCKE exercise
and 1.11 ± 0.15 during the SCCKE exercise. Conclusions] The SOCKE exercise is targeted at
quadriceps muscle training and has a recruitment effect on the VMO. The beneficial effect
of the SOCKE exercise is better than that of the SCCKE exercise.Key words: Patellofemoral pain syndrome, Sling exercise therapy, Electromyography |
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