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J Korean Acad Rehabil Med. 1997 Oct;21(5):928-935. Korean. Original Article.
Chon J , Chun SI , Cho KJ , Jin MR , Kim TS , Kim DY , Ahn J , Jeong KS , Shin KS , Lee MH .
Department of Rehabilitation Medicine, Yonsei University College of Medicine, Korea.
Institute of Traditional Medicine, Yonsei University College of Medicine, Korea.
Department of Electrical Engineering, Yonsei University College of Engineering, Korea.
Institute of Medical Instruments Technology, Yonsei University, Korea.

The powers of the low-frequency(LF) and high-frequency(HF) components characterizing heart rate variability (HRV) appear to reflect, in their reciprocal relationship, changes in the state of the sympatho-vagal balance occurring during orthostatic stress with head-up tilt. We studied 24 healthy volunteers (median age, 23.1 years) who were subjected after a rest period to a series of passive head-up tilt steps chosen from the following angles: 0 degree. 15 degrees, 30degrees, 45degrees, 70degrees, and 90degrees under the condition of frequency controlled respiration(0.25Hz) in order to get data of the Korean young adults. During head-up tilt, heart rate and normalized low frequency power(LF(N : 0.05-0.15 Hz) of HRV showed significant increase(p=0.000), but normalized high frequency power(HFN : 0.2-0.3 Hz) and total power showed progressive decrease(p=0.000, p<0.01 respectively). Male showed significantly higher LF(N and lower HFN than female at tilt table angle 0degree(p<0.01). Power spectral analysis of HRV appears to be capable of providing a noninvasive quantitatibve evaluation of graded changes in the state of the sympatho-vagal balance.

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