Journal of the Ergonomics Society of Korea (대한인간공학회지)

Ergonomics Society of Korea (대한인간공학회)
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The Study on Workload Reducing Effects of Multi-Elastic Insoles

다탄성 Insole의 Workload 감소 효과에 관한 연구

  • Lee, Chang-Min (Department of Industrial and Management Engineering, Dongeui University) ;
  • Lee, Kyun-Deuk (Busan Footwear Industrial Promotion Center) ;
  • Oh, Yeon-Ju (Department of Industrial and Management Engineering, Dongeui University) ;
  • Kim, Jin-Hoon (Department of Industrial and Management Engineering, Dongeui University)
  • 이창민 (동의대학교 산업경영공학과) ;
  • 이경득 (부산신발산업진흥센터) ;
  • 오연주 (동의대학교 산업경영공학과) ;
  • 김진훈 (동의대학교 산업경영공학과)
  • Published : 2007.05.31
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Abstract

The Work-Related Musculoskeletal Disorders (WMSDs) can be occurred by various factors such as repetition, forceful exertions and awkward postures. Especially, occurrences of the WMSDs on the waist and lower limb are reported in workplaces, demanded standing postures for a long time, in service and manufacturing industry. The static and standing postures without movement for a long time increase work loads to the lower limb and the waist. Accordingly, anti-fatigue mat or anti-fatigue insole is used as a preventing device of the WMSDs. However anti-fatigue mats are limited in space and movement. In this study, multi-elastic insoles are designed and shown the effects of the workload reduction for a long time under the standing work. The foot pressures and EMG (Electromyography) are measured at 0 hour and after 2 hours by 6 health students in their twenties. The 6 prototype insoles are designed with three elastic (Low, Medium and High). These insoles are compared with no insole (insole type 7) as control group. The EMG measurement was conducted to waist (erector spinae muscle), thigh (vastus lateralis muscle) and calf (gastrocnemius muscle). The foot pressure is analyzed by mean pressure value and the EMG analysis is investigated through MF (Median Frequency), MPF (Mean Power Frequency) and ZCR (Zero Crossing Rate). The results of the foot pressure show that the multi-elastic insoles had smaller foot pressure value than that of no-insole. Moreover, Insole 2 and Insole 3 have the smallest increasing rate in foot pressure. The EMG results show that the multi-elastic insoles had smaller EMG shift value than that of no-insole in 2 hour, and then shift value shows the smallest value in Insole 2. Therefore, this study presents that the multi-elastic insoles have reducing effects of the work load for a long time standing work in both side of foot pressure and EMG.

Keywords

References

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