The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지
DOI QR코드

DOI QR Code

Excitation Frequency Characteristics of a Conductive Fabric Sensor Using the Bio-impedance for Estimating Knee Joint Movements

슬관절 운동 평가를 위한 생체 임피던스 측정용 전도성 섬유 센서의 여기 주파수별 특성 평가

  • 이병우 (연세대학교 공대 전기전자공학과) ;
  • 이충근 (연세대학교 공대 전기전자공학과) ;
  • 김진권 (연세대학교 공대 전기전자공학과) ;
  • 정완진 (연세대학교 공대 전기전자공학과) ;
  • 이명호 (연세대학교 공대 전기전자공학과)
  • Received : 2011.03.17
  • Accepted : 2011.05.29
  • Published : 2011.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

This study describes a conductive fabric sensor and determines an optimum excitation frequency of the sensor to evaluate knee joint movements. Subjects were composed of 15 males (age: $30.7{\pm}5.3$) with no known problems with their knee joints. The upper side of subjects' lower limbs was divided into two areas and the lower side of subjects' lower limbs was divided into three areas. The sensors were attached to 1 for 3 spot from a hip joint and to 3 for 4 spot from a knee joint which are the optimum conductive fabric sensor configuration to evaluate knee joint movements. As a result, the optimum excitation frequency for evaluating knee joint movements using conductive fabric sensors was 25 kHz. Average and standard deviation of bio-impedance changes from 15 subjects were $92.1{\pm}137.2{\Omega}$ at 25 kHz. The difference of bio-impedance changes between 25 kHz and 50 kHz was statistically significant (p<0.05) and the difference of bio-impedance changes between 25 kHz and 100 kHz was also statistically significant (p<0.001). These results showed that conductive fabric sensors are more sensitive to measure bio-impedance for evaluating knee joint movements as an excitation frequency decreases.

Keywords

References

  1. T. Nakamura and Y. Yamamoto, "Evaluation System of Physical Exercise Ability using Bio-electrical Impedance," International Symposium on Industrial Electronics Proceedings 2001, pp. 2053-2058, 2001.
  2. R. K. Begg, R. Wytch, and R. E. Major, "Instrumentation used in clinical gait studies: a review," J. Med. Eng. Technol. vol. 13, pp. 290-295, 1989. https://doi.org/10.3109/03091908909016204
  3. M. J. Adrian and J. M. Cooper, Biomechanics of Human Movement, McGraw-Hill, pp. 20 - 31, 1994.
  4. C. G. Song, S. C. Kim, K. C. Nam, and D. W. Kim, "Optimum electrode configuration for detection of leg movement using bio-impedance," Physiological measurement, Vol. 26, No. 2, pp. S59-68, 2005. https://doi.org/10.1088/0967-3334/26/2/006
  5. D. Farina, R. Merletti, M. Nazzaro, and I. Caruso, "Effect of joint angle on EMG variables in leg and thigh muscles," IEEE Eng. Med. Biol. vol. 20, pp. 62-71, 2001. https://doi.org/10.1109/51.982277
  6. S. C. Kim, "Optimum electrode configuration for detection of arm movement using bio-impedance," Med. Biol. Eng. Comput., vol. 41, pp. 141-145, 2003. https://doi.org/10.1007/BF02344881
  7. L. E. Baker, "Principles of the impedance technique," IEEE engineering in medicine and biology magazine, pp. 11-15, 1989.
  8. D. W. Kim, "Detection of physiological events by impedance," Yonsei Medical Journal, Vol. 30, No. 1, 1989.
  9. A. Seo, M. Rys, and S. Konz, "Measuring lower leg swelling: optimum frequency for impedance method," Med. Biol. Eng. Comput., vol. 39, pp. 185-189, 2001. https://doi.org/10.1007/BF02344802
  10. J. G. Webster, Medical instrumentation: application and design., John Wiley & Sons, Inc., pp. 123 - 138, 1998.
  11. J. Nyboer, M. M. Kreider, and L. Hannapel, "Electrical Impedance Plethysmography: A Physical and Physiologic Approach to Peripheral Vascular Study," Circulation, Vol. II, pp. 811-821, 1950.
  12. T. J. C. Faes, H. A. van der Meij, J. C. de Munck, and R. M. Heethaar, "The electric resistivity of human tissues (100 Hz-10 MHz): a meta-analysis of review studies," Physiological measurement, Vol. 20, pp. R1-10, 1999. https://doi.org/10.1088/0967-3334/20/4/201
  13. M. Y. Jaffrin, M. Maasrani, A. Le Gourrier, and B. Boudailliez, "Extra- and intracellular volume monitoring by impedance during haemodialysis using Cole-Cole extrapolation," Med. Biol. Eng. Comput., vol. 35, pp. 266-270, 1997. https://doi.org/10.1007/BF02530048