Effects of squats accompanied by hip joint adduction on the selective
activity of the vastus medialis oblique |
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Authors: | In Hyouk Hyong |
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Institution: | 1) Department of Physical Therapy, Shinsung University, Republic of Korea |
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Abstract: | Purpose] This study evaluated the effective selective activation method of the vastus
medialis oblique for knee joint stabilization in patients with patellofemoral pain
syndrome. Subjects and Methods] Fifteen healthy college students (9 males, 6 females);
mean age, height, and weight: 22.2 years, 167.8 cm, and 61.4 kg, respectively)
participated. The knee angle was held at 60°. Muscle activities were measured once each
during an ordinary squat and a squat accompanied by hip joint adduction. The muscle
activities of the vastus medialis oblique and vastus lateralis were measured by
electromyography for five seconds while maintaining 60° knee flexion. Electromyography
signals were obtained at a sampling rate of 1,000 Hz and band pass filtering at 20–50 Hz.
The obtained raw root mean square was divided by the maximal voluntary isometric
contraction and expressed as a percentage. The selective activity of the vastus medialis
oblique was assessed according to the muscle activity ratio of the vastus medialis oblique
to the vastus lateralis. Results] The activity ratio of the vastus medialis oblique was
higher during a squat with hip joint adduction than without. Conclusion] A squat
accompanied by hip joint adduction is effective for the selective activation of the vastus
medialis oblique.Key words: Patellofemoral pain syndrome, Vastus medialis oblique, Squat |
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