Journal of the Ergonomics Society of Korea (대한인간공학회지)

Ergonomics Society of Korea (대한인간공학회)
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Perceived Discomfort of Upper Body Postures with Varying External Loads

상체의 자세 변화에 따른 외부부하에 대한 불편도 영향 평가

  • 최동식 (고려대학교 대학원 산업시스템정보공학과) ;
  • 박성준 (남서울대학교 산업정보시스템공학과) ;
  • 정의승 (고려대학교 산업시스템 정보공학과) ;
  • 최재호 (대진대학교 산업시스템공학과)
  • Published : 2004.11.30
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Abstract

The purpose of this study is to evaluate perceived discomfort of working postures in terms of upper body (back, shoulder, and elbow) flexions when an external load varies. Eighteen subjects participated in an experiment of appraising perceived discomfort of varying upper body postures with three levels of external loads given. The ANOVA results showed that the perceived discomfort of upper body postures was significantly affected by the external load. It was also apparent that the interactions between external load and upper body posture were significant (p< 0.001). The result implies that a new posture classification scheme for workload assessment methods may be in need to reflect such interactions between external load and upper body posture. In order to support the statement, a regression model of perceived discomfort of upper body postures obtained from the experiment was developed and compared to that of perceived discomfort of seven work-related postures found in automobile assembly operations. The correlation coefficient between predicted and actual values of perceived discomfort was about 0.96. It is expected that the result help to properly estimate the body stress resluting from worker's postures and external loads and can be used as a valuable design guideline on preventing work-related musculoskeletal diseases in industry.

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