Journal of the Ergonomics Society of Korea (대한인간공학회지)

Ergonomics Society of Korea (대한인간공학회)
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The Accuracy of Subjective Rating of Grip Strength Associated with Target Force Levels

Target Force Level에 따른 악력의 주관적 평가 정확도

  • Kong, Yong-Ku (Department of Industrial Engineering, Sungkyunkwan University) ;
  • Park, Donghyun (Department of Industrial Engineering, Inha University) ;
  • Choi, Kyeong-Hee (Department of Industrial Engineering, Sungkyunkwan University) ;
  • Shin, Jae-Min (Department of Industrial Engineering, Sungkyunkwan University) ;
  • Lee, Juhee (Department of Industrial Engineering, Sungkyunkwan University) ;
  • Lee, Jun-Hyub (Department of Industrial Engineering, Sungkyunkwan University)
  • 공용구 (성균관대학교 산업공학과) ;
  • 박동현 (인하대학교 산업경영공학과) ;
  • 최경희 (성균관대학교 산업공학과) ;
  • 신재민 (성균관대학교 산업공학과) ;
  • 이주희 (성균관대학교 산업공학과) ;
  • 이준협 (성균관대학교 산업공학과)
  • Received : 2017.09.08
  • Accepted : 2017.10.12
  • Published : 2017.10.31
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Abstract

Objective: The purposes of this experiment are an analysis of accuracy between target force level and subjective rating for the Target Force Level and an analysis of the patterns of subjective rating depending on target force level when there is no feedback from males for analysis. Background: The study of perceived exertion about the static contraction is processed with using among the matching procedure method between contralateral limbs, Exertion vs. Borg CR-10 scale and Exertion vs. %MVC (Maximum Voluntary Contraction). However, when there is no feedback, there is lack of the study on whether the subject can distinguish the subjective rating of the force depending on the target force levels. Method: Total 30 males, healthy subjects are measured the maximum grip strength, MVC, and then, each subject is measured the subjective rating and the accuracy with the random target force level (10, 20, 30, 40, 50, 60, 70, 80, and 90% MVC). Results: In the MVC study, males exerted 256.87N (${\pm}51.33$). In the subjective rating of grip strength increased for each Target Force Level (9 levels), higher subjective rating evaluated (p<0.05). In accuracy examination between target force level and subjective rating of grip strength by each %MVC, 10, 30, 40, 50, 70, 90% target force levels showed accurate strength (p>0.05). However, at 20% target force level, the subjects evaluated less subjective rating of grip strength than the target force (Underestimation), and at 60% and 80% target force level, the subjects evaluated more subjective rating of grip strength than the target force (Overestimation) (p<0.05). Conclusion: In the experiment, the MVC showed 256.87N (${\pm}51.33$) for the male adults and as the subjective rating value increased for each Target Force Level (9 levels), higher subjective rating evaluated (p<0.05). Moreover, the results of the accuracy test between target forces and subjective rating of the subjects showed that most participants rated a fairly accurate assessment of subjective rating of grip strength for Target Force Level (9 levels), except for 20%, 60%, and 80%MVC. Application: This experimental result would be used for basic data for the subjective rating of grip strength pattern by the target force level when the voluntary muscle is contracted.

Keywords

References

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