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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  

Kim, Hyun-Hee (Department of Physical Therapy, Shinsung University)
Song, Chang-Ho (Department of Physical Therapy, Sahmyook University)
Publication Information
Journal of the Korean Society of Physical Medicine / v.6, no.2, 2011 , pp. 135-143 More about this Journal
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
Electromyography; High-heeled shoes; Vastus medialis oblique;
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