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KMID : 1211620110060020135
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Journal of the Korean Society of Physical Medicine
2011 Volume.6 No. 2 p.135 ~ p.143
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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
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Kim Hyun-Hee
Song Chang-Ho
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Abstract
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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 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.
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KEYWORD
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Electromyography, High-heeled shoes, Vastus medialis oblique
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