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KMID : 1211620150100020009
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Journal of the Korean Society of Physical Medicine
2015 Volume.10 No. 2 p.9 ~ p.16
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Influences of Shoe Heel Height on Isometric Shoulder Abductor Strength and EMG Activities of Selected Shoulder Muscles
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오덕원:Oh Duck-Won
저자없음:No authors listed
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Abstract
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PURPOSE : The objective of this study was to identify the effects of shoulder abduction strength and EMG activities of the selected scapular and shoulder muscles during isometric shoulder abduction.
METHODS : Thirty-four healthy young females were recruited for this study. Surface EMG equipment with inline force sensor was used to determine the shoulder abductor strength and the activity of the serratus anterior (SA), upper trapezius (UT), lower trapezius (LT), and middle deltoid (MD) during three shoe heel height conditions: (1) barefoot, (2) 3-cm shoe heel height, and (3) 7-cm shoe heel height.
RESULTS : Isometric shoulder strength showed statistically significant difference among the conditions (p<0.05), and post-hoc test showed lower strength during the 7-cm condition (49.98±17.56 kg) than during the barefoot (44.97±20.15 kg) and 3-cm conditions (36.59±17.07 kg). Furthermore, EMG activities of the SA, UT, and MD appeared to be statistically significantly different among the conditions, with lower values in the 7-cm condition compared to the barefoot condition (p<0.05). EMG ratios (MD/UT and SA/UT) were lower during the 7-cm condition than during the barefoot condition (p<0.05).
CONCLUSION : These findings suggest that isometric shoulder abduction strength and EMG activities of scapular and shoulder muscles may be adversely changed with increasing shoe heel height.
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KEYWORD
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Shoe heel height, Abductor strength, Shoulder muscles, EMG activities
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