Journal of the Ergonomics Society of Korea (대한인간공학회지)

Ergonomics Society of Korea (대한인간공학회)
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Evaluation of Varying Shoulder Postures with External Loads using a Psychophysical Method

외부 부하가 부과된 어깨 자세의 심물리학적 불편도 평가

  • 류태범 (포항공과대학교 기계산업공학부) ;
  • 박용주 (삼성전자 디지털미디어총괄부) ;
  • 나석희 (포항공과대학교 기계산업공학부) ;
  • 정민근 (포항공과대학교 기계산업공학부) ;
  • 기도형 (계명대학교 산업시스템공학과)
  • Published : 2005.05.31
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Abstract

The purpose of this study is to quantitatively investigate perceived discomfort of complex shoulder postures with external loads and to propose a preliminary evaluation scheme of shoulder postures. Twelve healthy male adults participated in an experiment to rate their perceived discomfort of shoulder postures. The independent variables were shoulder flexion angle(45, 90 and 150$^{\circ}$), adduction/abduction angle(-30, -10, 0, 30 and 60$^{\circ}$), and external load(0, 1.5 and 3.0kg). The results revealed that the flexion angle, external load and their interaction significantly affected the perceived discomfort(p$<$0.05) but the effect of adduction/abduction angle on the discomfort was not significant(p$>$0.05). The effect of external load was much larger than that of any other factor with explaining about 81% of the total variation of discomfort scores. Based on the experimental results a preliminary scheme was presented to evaluate the stress of shoulder postures with external loads.

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References

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