| abstract |
| Background The time of using a computer and a smart-phone by female high school students continues to increase. The purpose of this study was to investigate the effect of school uniform for female high school students on neck and shoulder muscle activities during computer typing, smartphone use, and handwriting.
Methods Surface electromyography (SEMG) of cervical erector spinae (CES), upper trapezius (UT), anterior deltoid (AD), and posterior deltoid (PD) were measured during computer typing, smartphone use and handwriting with five subjects in two different sized school uniform shirts from two brands. The measured SEMG data were normalized by %RVC.
Result In all types of shirts, CES showed the highest muscle activity among four muscles during work. UT had significantly higher muscle activity during computer typing than other works in all types of shirts. The muscle activity of AD during computer typing was significantly higher than during handwriting in the three types of shirts except the larger shirt of brand A. PD muscle activity in all four types of shirts was highest during handwriting followed by computer typing and was lowest during smartphone use. In accordance with the brand of a same sized shirt, the muscle activities of CES, AD and PD during handwriting in the smaller shirt and that of AD during typing and CES and UT during smartphone use in the larger shirt were significantly higher in brand A than in brand B. According to the shirt size of a same brand, the muscle activity of CES, AD, and PD during smartphone use was significantly high in the smaller shirt only in brand A.
Conclusion The muscle activities of the neck and shoulder differed by the type of work and the size of the shirt. Careful consideration will be required to determine the amount of ease and to establish the size system for producing functional uniform shirts that reduce muscle fatigue. |
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| Key Words |
| 교복 셔츠, 작업 종류, 근활성도, School Uniform Shirt, Work Type, Muscle Activity |
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