Physical Therapy Korea (한국전문물리치료학회지)

Korean Research Society of Physical Therapy (한국전문물리치료학회)
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Effects of the Hip Internal Rotation Gait on Gluteal and Erector Spinae Muscle Activity

고관절 내회전 보행이 둔부 근육과 척추 기립근의 근활성도에 미치는 영향

  • Kwon, Oh-Yun (Dept. of Physical Therapy, College of Health Science, Yonsei University, Dept. of Ergonomic Therapy, The Graduate School of Health and Environment, Yonsei University, Institute of Health Science, Yonsei University) ;
  • Won, Jong-Hyuck (Dept. of Rehabilitation Therapy, The Graduate School, Yonsei University) ;
  • Oh, Jae-Seop (Dept. of Rehabilitation Therapy, The Graduate School, Yonsei University) ;
  • Lee, Won-Hwee (Dept. of Rehabilitation Therapy, The Graduate School, Yonsei University) ;
  • Kim, Soo-Jung (Dept. of Rehabilitation Therapy, The Graduate School, Yonsei University)
  • 권오윤 (연세대학교 보건과학대학 물리치료학과, 보건환경대학원 인간공학치료학과, 보건과학연구소) ;
  • 원종혁 (연세대학교 대학원 재활학과) ;
  • 오재섭 (연세대학교 대학원 재활학과) ;
  • 이원휘 (연세대학교 대학원 재활학과) ;
  • 김수정 (연세대학교 대학원 재활학과)
  • Received : 2005.01.02
  • Accepted : 2006.01.31
  • Published : 2006.02.19
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Abstract

The purpose of this study was to identify the effect of the hip internal rotation on gluteal and erector spinae muscle electromyographic (EMG) activity during treadmill walking. Eleven healthy subjects were recruited. All subjects performed treadmill walking while maintaining the hip in neutral position (condition 1) and in internal rotation (condition 2). Surface EMG activity was recorded from four muscles (gluteus maximus (GM), gluteus medius (GMED), tensor fascia latae (TFL), and erector spinae (ES)) and the hip internal rotation angle was measured using a three dimensional motion analysis system. The gait cycle was determined with two foot switches, and stance phase was normalized as 100% stance phase (SP) for each condition using the MatLab 7.0 program. The normalized EMG activities according to the hip rotation (neutral or internal rotation) were compared using a paired t-test. During the entire SP of treadmill walking, the EMG activities of GM in condition 1 were significantly greater than in condition 2 (p<.05). The EMG activities of TFL and ES in condition 2 were significantly greater than in condition 1 (p<.05). The EMG activities of the GMED in condition 1 were significantly greater than in condition 1 (p>.05) except for 80~100% SP. Further studies need randomized control trials regarding the effect of hip internal rotation on the hip and lumbar spine muscle activity. Kinetic variables during gait or going up and down stairs are also needed.

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