Physical Therapy Korea (한국전문물리치료학회지)

Korean Research Society of Physical Therapy (한국전문물리치료학회)
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Reliability of the Onset Time Determinations During Maximal Isometric Contraction in Surface EMG

최대 등척성 수축시 표면근전도에서 근 수축 개시점 결정을 위한 기법들의 신뢰도

  • Chung, Yi-Jung (Dept. of Rehabilitation Therapy, The Graduate School, Yonsei University) ;
  • Cho, Sang-Hyun (Dept. of Physical Therapy, College of Health Science, Yonsei University, Institute of Health Science, Yonsei University) ;
  • Lee, Jung-Hoon (Dept. of Biomedical Engineering, The Graduate School, Yonsei University) ;
  • Lee, Sang-Heon (Dept. of Rehabilitation Therapy, The Graduate School, Yonsei University)
  • 정이정 (연세대학교 대학원 재활학과) ;
  • 조상현 (연세대학교 보건과학대학 물리치료학과 및 보건과학 연구소) ;
  • 이정훈 (연세대학교 대학원 의공학과) ;
  • 이상헌 (연세대학교 대학원 재활학과)
  • Published : 2003.02.19
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Abstract

The purpose of this study was to compare the relative accuracy of a range of computer-based analysis with respect to EMG onset determined visually by an experienced examiner. Ten healthy students (6 male, 4 female) were recruited and three times randomly selected trials of isometric contraction of wrist flexion and extension were evaluated using four technique. These methods were compared which varied in terms of EMG processing, threshold value and the number of samples for which the mean must exceed the defined threshold, and beyond 7% of maximum amplitude. To identify determination of onset time, ICCs(Intraclass Correlation Coefficients) was used and inter-rater arid intra-rater reliability ranged good in visually derived onset values. The results of this study present that in wrist flexion and extension, the reliability of the inter and intra-examiner muscle contraction onset times through visual analysis showed beyond .971 with ICCs. The reliability of the muscle contraction onset time decision through visual reading, tested with computer analysis, showed a relationship of all the selected analysis methods with ICCs .859 and .871. The objective computer-based analysis comparing with visual reading at the same time is the effective and qualitative data analysis method, considering the specificity of each study method.

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