Journal of the Korean Society of Physical Medicine (대한물리의학회지)

The Korean Society of Physical Medicine (대한물리의학회)
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Effects of Shoe Heel Height on the Onset of VMO Relative to VL and VMO/VL EMG Ratio during Stair Ascent in Women without Knee Pathology

건강한 여성의 하이힐 계단오르기 보행이 안쪽빗넓은근과 가쪽넓은근의 근활성비와 개시시간에 미치는 영향

  • Kim, Hyun-Hee (Department of Physical Therapy, Shinsung University) ;
  • Song, Chang-Ho (Department of Physical Therapy, Sahmyook University)
  • 김현희 (신성대학 물리치료과) ;
  • 송창호 (삼육대학교 물리치료학과)
  • Received : 2011.03.13
  • Accepted : 2011.04.22
  • Published : 2011.05.31
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Abstract

Purpose: The purpose of this study was to investigate onset timing of vastus medialis oblique(VMO) relative to vastus lateralis(VL) the VMO/VL electromyographic(EMG) ratio according to heel height Methods: A repeated measures design was used. Fifteen healthy female college students with no known knee musculoskeletal dysfunction were recruited this study. They carried out a standardised stair acent activity under 4 conditions; barefoot, and with heel height of 1, 3, 7 cm. Muscle activity was measured by surface EMG (Myosystem 1400A, Noraxon Inc., U.S.A). Data were analysed using $1{\times}4$ repeated measures ANOVA. Results: Onset timing differed with heel height(p<.05). However, the VMO/VL EMG ratio was not significantly difference between conditions. Conclusion: We found that 7 cm heel height delayed in VMO onset compared with 3 cm heel height during stair ascent, but no change in the relative EMG intensity of VMO and VL as measured by th VMO/VL ratio. The findings indicate that high-heeled shoes may have disadvantages in knee stability because of delayed onset of VMO. Due to a lack of knee joint stability, wearing of high heeled shoes should be avoided.

Keywords

References

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