Physical Therapy Korea (한국전문물리치료학회지)

Korean Research Society of Physical Therapy (한국전문물리치료학회)
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The Effect of Changes in Patellar Height Using Infra-Patellar Strap on the EMG Activity of Quadriceps Muscles During a Squat Exercise in Adults With Patellar Baja

하위 무릎뼈를 지닌 성인들을 대상으로 쪼그려 앉기 운동 시 하위 무릎뼈 스트랩을 이용한 무릎뼈 높이 변화가 넙다리네갈래근의 근 활성도에 미치는 영향

  • Kang, Min-Hyeok (Dept. of Physical Therapy, The Graduate School, Inje University) ;
  • Kim, Ji-Won (Dept. of Rehabilitation Science, The Graduate School, Inje University) ;
  • Yoon, Ji-Yeon (Dept. of Rehabilitation Science, The Graduate School, Inje University) ;
  • Jang, Jun-Hyeok (Dept. of Physical Therapy, Haeundae Jaseng Hospital of Oriental Medicine) ;
  • Oh, Jae-Seop (Dept. of Physical Therapy, College of Biomedical Science and Engineering, Inje University)
  • 강민혁 (인제대학교 대학원 물리치료학과) ;
  • 김지원 (인제대학교 대학원 재활과학과) ;
  • 윤지연 (인제대학교 대학원 재활과학과) ;
  • 장준혁 (해운대 자생한방병원 물리치료실) ;
  • 오재섭 (인제대학교 의생명공학대학 물리치료학과)
  • Received : 2012.01.07
  • Accepted : 2012.02.03
  • Published : 2012.02.19
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Abstract

The purpose of this study was to assess the influence of patellar height on quadriceps muscles' electromyography (EMG) activity during a squat exercise in adults with patella baja. For the study, we recruited 15 volunteers who had patella baja on the right side. We measured the EMG activity of the right rectus femoris, vastus medialis oblique, and vastus lateralis muscles during squat exercises under two conditions, specifically with and without an infra-patellar strap. The infra-patellar strap was applied below the tested patella to elevate the patella to a normal height. A paired t-test was used to compare the effects of patella height on EMG activity of the quadriceps muscles. The EMG activity of the rectus femoris (RF), vastus medialis oblique (VMO), and vastus lateralis (VL) muscles were significantly decreased during the squat exercise with the infra-patellar strap compared to the same exercise without the infra-patellar strap (p<.05), while the VMO/VL ratio was not different significantly between two conditions (p>.05). The findings of this study suggest that an infra-patellar strap may benefit people with patellar baja, as changes in patellar height could improve the efficiency of the quadriceps muscles.

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References

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