The Journal of Korean Academy of Orthopedic Manual Physical Therapy (대한정형도수물리치료학회지)

Korean Academy of Orthopedic Manual Physical Therapy (대한정형도수물리치료학회)
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Can Hip Adduction induce more Selective Activation of the Vastus Medialis Obliquus during Straight Leg Raise Exercise?

엉덩관절 모음을 동반한 뻗은다리 올림 시 안쪽넓은빗근의 선택적 활성화를 더 이끌어낼 수 있는가?

  • Seong-in Song (Dept. of Physical Therapy, Korea Medical Institute Busan Center) ;
  • Chang-hwan Bae (Dept. of Physical Therapy, Bae Chang Hwan Training Center) ;
  • Sang-hyun Kim (Dept. of Physical Therapy, Ulsan Hospital)
  • Received : 2023.05.30
  • Accepted : 2023.07.01
  • Published : 2023.08.31
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Abstract

Background: There is still controversy as to whether hip external rotation and dorsiflexion selectively activate the vastus medialis obliquus (VMO) during straight leg raise exercise. Due to the anatomical characteristics, hip adduction must be preceded to activate the VMO. In this study, the activities of the rectus femoris (RF), vastus lateralis (VL), VMO were measured by adding the hip adduction movement to the straight leg raise exercise with hip 45° external rotation and straight leg raise exercise with hip 45° external rotation and dorsiflexion. Through this, we want to find out whether the VMO is selectively activated. Methods: Thirteen healthy participants performed straight leg raise exercise with hip 45° external rotation, straight leg raise exercise with hip 45° external rotation and dorsiflexion, straight leg raise exercise with hip 45° external rotation and adduction, straight leg raise exercise with hip 45° external rotation and adduction and dorsiflexion was randomly performed. Through this, EMG data of the RF, VL, VMO were collected. Results: During the straight leg raise exercise, hip adduction increased the activity of the VMO and VL, no significant difference was found(p>.05). However, in the VMO/VL ratio, straight leg raise exercise with hip 45° external rotation and adduction and dorsiflexion activated the VMO and the VL at a ratio of about 1:1, It showed a significantly higher rate than straight leg raise exercise with hip 45° external rotation(p<.05). Conclusion: During the straight leg raise exercise, hip adduction is considered to be an important movement that can selectively induce the activity of the VMO. Therefore, follow-up studies on this should be conducted.

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References

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