Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Methods for Measurement of Moment of Segmental Inertia Using a Dynamometer

동력계를 이용한 분절관성모멘트 측정 방법

  • Son, J. (Department of Biomedical Engineering and Institute of Medical Engineering, Yonsei University) ;
  • Kim, Y.H. (Department of Biomedical Engineering and Institute of Medical Engineering, Yonsei University)
  • 손종상 (연세대학교 의공학부, 연세의료공학연구원) ;
  • 김영호 (연세대학교 의공학부, 연세의료공학연구원)
  • Received : 2013.08.01
  • Accepted : 2013.09.10
  • Published : 2013.09.30
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Abstract

Moments of inertia of limb segments are essential to calculate parameters related to the segmental rotation. To analyze the human motion accurately and specifically, moments of inertia obtained from the individual are required. In this study, a simple method to determine a subject-specific moment of segmental inertia using a dynamometer is introduced. In order to evaluate the method, one male participated to test for his forearm plus hand on a commercial dynamometer. Three passive speeds, i.e. 240, 270, and $300^{\circ}/s$, were chosen to confirm whether the moment of inertia values at each speed approach to a fixed value. The same procedure was repeated on the day after to evaluate whether the method is reproducible. As the results, there were no significant differences among the speeds and between the days. The value of the moment of the forearm inertia was 0.216 $kg{\cdot}m^2$ that is apparently higher compared to values by previous models. Nonetheless, it seems to be acceptable based on our body mass index analysis using reported subject height and mass in each previous study. According to our results, the developed method could be useful to determine the segmental moment of inertia of an individual, showing no significant differences among the speeds and between the days. Thus, we believe that our results are reliable according to two appropriate evaluation procedures. This finding would be helpful to calculate segmental rotation related parameters of an individual.

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References

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