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- 저자 : 고명훈(Myeonghoon Ko) (검색결과 1 건)
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이일석(Ilseok Lee),고명훈(Myeonghoon Ko),남연경(YunKyung Nam),진상은(Sangeun Jin) 대한인간공학회 2019 대한인간공학회 학술대회논문집 Vol.2019 No.10
Objective: This study aimed to develop ergonomic guidelines for the standing desk with a focus on the use of armrest that may significantly modify the shoulder, arm, wrist and neck postures. Background: Applicable ergonomic guidelines exist for the sitting office workstation, but previous studies revealed that the guideline is not adaptable in the standing workstation, in that the workstation changes shoulder, elbow and wrist postures. Method: Fourteen healthy male participants were asked to use two standing desk shapes (plane and concave (assuming armrest) boards), two monitor heights (eyeline and -10cm from eyeline), and three desk heights (-5, 0, +5 from elbow height) for three minutes. Also, two sitting postures with or without a backrest were recorded. During the experimental trials, the kinematic and muscle recruitment patterns in neck, lumbar, shoulder and wrist were measured by the motion capture system and EMG, and the desk location, monitor height and angle were recorded. Results: In general, use of the standing desk showed significantly better lower back, shoulder and head postures as comparted to the sitting workstation, but the wrist extension angle was significantly increased in the standing posture, especially in the desk height of -5 and 0 cm. In contrast, the wrist extension angle showed a significant decrease (14.3%, about 4°) under the +5 cm height condition, suggesting a positive effect of the armrest, but at the cost of ulnar deviation (10.4%, about 2°). The following EMG analysis support the result extensor carpi radialis (ECR) and paraspinals at L4. Under the +5 cm height condition, the positive effects of armrest resulted in 2% and 1% decrease in muscle activation level of extensor carpi radialis and paraspinals at L4, respectively. The benefit of the higher desk was also showed on rounded shoulder angle (about 2.3° decreased under the +5 cm height), but at the cost of shoulder abduction angle (about 12°). The two negative effects (ulnar deviation and shoulder abduction angle) can be solved. In shoulder abduction case, the armrest supports the load from the abduction, and wrist ulnar deviation can be solved by using the ergonomic keyboard which the center is bent. Conclusion: This study found that the standing desk had positive effects on wrist, shoulder and head posture same as the previous study. Furthermore, current study found that the standing desk with armrest (desk under the +5 cm height) effect showed more positive effects on various upper extremities. Application: Using a standing desk instead of sitting desk can be a good strategy. Especially, the use of standing desk under the +5 cm height condition will have a positive effect on the prevention of worker’s musculoskeletal disorders.
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