Physical Therapy Rehabilitation Science

korean Academy of Physical Therapy Rehabilitation Science (물리치료재활과학회)
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A Comparative of Knee Joint Instability and Muscle Activity Due to Medial or Lateral Deviation of Knee while Lunge Exercise

  • Sijin Lee (Department of physical therapy, graduate school of Kyungnam University) ;
  • Byeong-Jo Min (Department of Physical Therapy, Collage of Health Science, Kyungnam University) ;
  • Jin-A Park (Department of physical therapy, graduate school of Kyungnam University) ;
  • Hyeong-Geun Kim (Department of Physical Therapy, Collage of Health Science, Kyungnam University) ;
  • Doochul Shin (Department of Physical Therapy, College of Health and Welfare, Sahmyook University)
  • Received : 2024.04.02
  • Accepted : 2024.05.21
  • Published : 2024.06.30
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Abstract

Objective: The purpose of this study was to compare the muscle activity of the vastus lateralis, vastus medialis, rectus femoris, and gluteus medius muscles according to the medial/lateral bias of the knee during lunge exercise. Design: Crossed-control group study Methods: This study recruited 20 healthy men and women in their 20s who were capable of lunge exercise and had no musculoskeletal or neurological abnormalities. All three postures were performed three times each during lunge exercise. In each posture, surface electromyography (EMG) equipment was used to measure muscle activity of the vastus lateralis, vastus medialis, rectus femoris, and gluteus medius during lunge exercise. Results: As a result of comparing lower extremity muscle activity in normal, medial and lateral knee-deviation postures according to lunge exercise, the muscle activity of the vastus medialis was 107.09±13.90% in the normal posture, 79.24±5.26% in the medial- deviation posture and 125.73±14.30% in the lateral- deviation posture, which was a statistically significant difference (p<0.05). However, In the case of the vastus lateralis, rectus femoris and gluteus medius there was no statistically significant difference in muscle activity in the medial and lateral deviation positions(p>0.05). Conclusions: As a result, it was found that the muscle activity of the vastus medialis during lunge exercise significantly increased in the lateral deviation posture compared to the normal and medial deviation postures. In the case of the vastus lateralis, rectus femoris and gluteus medius there was no significant difference in muscle activity for medial and lateral knee deviation.

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References

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