대한의용생체공학회:학술대회논문집 (Proceedings of the KOSOMBE Conference)

대한의용생체공학회 (The Korean Society of Medical and Biological Engineering)
권호 표지

점증적 틸트 각도 변화에 대한 심박변동에 관한 연구

A Study on Heart Rate Variabilities during Graded Head-up Tilt

  • 정기삼 (연세대학교 공과대학 전기공학과) ;
  • 신건수 (연세대학교 의료기기 기술연구소) ;
  • 이정환 (연세대학교 공과대학 전기공학과) ;
  • 최석준 (연세대학교 공과대학 전기공학과) ;
  • 안준 (연세대학교 의과대학 재활의학과) ;
  • 전중선 (연세대학교 의과대학 재활의학과) ;
  • 이명호 (연세대학교 공과대학 전기공학과)
  • Jeong, K.S. (Dept. of Electrical Eng., College of Engineering, Yonsei University) ;
  • Shin, K.S. (The Institute of Medical Instruments Technology, Yonsei University) ;
  • Lee, J.W. (Dept. of Electrical Eng., College of Engineering, Yonsei University) ;
  • Choi, S.J. (Dept. of Electrical Eng., College of Engineering, Yonsei University) ;
  • Ahn, J. (Dept. of Rehabilitation Med., College of Medicine, Yonsei University) ;
  • Chon, J.S. (Dept. of Rehabilitation Med., College of Medicine, Yonsei University) ;
  • Lee, M.H. (Dept. of Electrical Eng., College of Engineering, Yonsei University)
  • 발행 : 1997.05.23
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초록

In this paper, the power spectral analysis and fractral dimension analysis of heart rate variability(HRV) were performed to evaluate effects of orthostatic stress with head-up tilt on autonomic nervous system(ANS) for 24 young and healthy subjects(age: $24{\pm}5yr$.). The ECG and respiration signals were recorded at the tilt angle of $0^{\circ},\;15^{\circ},\;30^{\circ},\;45^{\circ},\;70^{\circ}$ and $90^{\circ}$ successively for 5 minutes per each stage under the condition of frequency controlled respiration (0.25Hz). Heart rate(HR) gradually increased as the angle increased. Similarly, according to the increment of angle, normalized low frequency(LF) component(0.05-0.15Hz) gradually increased, whereas normalized high frequency(HF) component (0.20-0.30Hz) was reduced. From these results it is speculated that orthostatic stress, head-up tilt, results in the prevalence of sympathetic tone in autonomic balance with the increment of sympathetic tone and the decrement of parasympathetic tone, which seems to mean that autonomic nervous system plays a major role in compensating for disturbances of cardiovascular system due to it.

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