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Journal of the Korean Academy of Rehabilitation Medicine 2000;24(1):35-41.
Assessment of Autonomic Nervous Function with Power Spectral Analysis of Heart Rate Variability in Spinal Cord Injured Patients.
Park, Chang Il , Chon, Joong Son , Shin, Ji Cheol , Kim, Deog Yong , Cho, Sung Rae
1Department of Rehabilitation Medicine, Yonsei University College of Medicine.
2Institute of Rehabilitation Medicine, Yonsei University College of Medicine.
3Department of Rehabilitation Medicine, Joong Moon College of Medicine.
척수손상 환자에서의 심박변동 분석에 의한 자율신경기능 평가
박창일, 전중선1, 신지철, 김덕용, 조성래
연세대학교 의과대학 재활의학교실 및 재활의학연구소, 1중문의대 분당 차병원 재활의학과
Abstract

Objective
To investigate the autonomic activities in spinal cord injured patients, and to compare their activities according to the level and completeness of spinal cord lesions.


Method
Thirty-five spinal cord injured patients and thirty healthy adults participated in this study. The ECG signals were recorded at the tilt angle of 0o and 70o for 5 minutes, and power spectral analysis of Heart Rate Variability (HRV) was done at each angle.


Results
The data reveals two major components such as a low-frequency (LF) component (0.05∼0.15 Hz) reflecting primarily sympathetic activities with orthostatic stress, and a high- frequency (HF) component (0.2∼0.3 Hz) reflecting parasympathetic activity. In supine position, all frequency components were not significantly different regardless the level and completeness of spinal cord lesion. At 70o head-up tilt position, the LF power and heart rate didn't increase in complete tetraplegia but significantly increased in paraplegia and healthy adults (p<0.05). However, the HF power didn't reveal any differences in four groups by decreasing significantly in all groups.


Conclusion
We concluded that there is an abnormal control of autonomic activities especially the sympathetic function in complete tetraiplegia, compared with paraplegia and healthy adults.

Key Words: Autonomic nervous function, Heart rate variability, Spinal cord injury


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