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자료유형
학술대회자료
저자정보
Jangwhon Yoon (Dongshin University) Taelim Yoon (Yonsei University) Heonseock Cynn (Yonsei University) Kisong Kim (Hoseo University)
저널정보
대한인간공학회 대한인간공학회 학술대회논문집 대한인간공학회 2013 추계학술대회
발행연도
2013.10
수록면
12 - 15 (4page)

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Background: Too much use of a smartphone can lead the musculoskeletal disorders in the neck and upper extremity. People spend more time in typing on it than using it as a phone. Objective: The aims of this study were to test which way we can type faster and better, and to understand the muscle recruitment in the neck and upper extremity while texting identical messages with one hand and two hands, and put the phone vertically and horizontally. Method: Fourteen healthy college students without any history of neuromuscular disorders or ongoing pain who used the smart phone more than one year were recruited. An iphone4 were used for texting the lyric of the Korean national anthem(79 characters with space) with one hand (dominant side) and two hands and put the phone vertically and horizontally. Muscle recruitment of neck (levator scapuare and middle trapezius), shoulder (infraspinatus and mid deltoid), elbow(biceps, brachioradialis), wrist (flexor and extensor carpi radialis), thumb (extensor and abductor policis, dorsal interossei) was collected with an electromyography system. The data were analyzed using the repeated measures ANOVA. Results: Typing with one hand took longer but not twice longer. After typing with one hand, more fatigue was reported. Placing the phone vertically or horizontally did not affect the typing speed. Typing error were less with two hand and with horizontally placed phone but not statistically significant. Less muscle activities were found in elbow and thumb with one hand use and in the neck with horizontally located phone. Application: Findings of this study can be valuable information for smartphone users to prevent the musculoskeletal disorders in the upper extremities.

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ABSTRACT
1. Introduction
2. Method
3. Results
4. Conclusion
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