Document Detail

Rhythms in the central nervous system and 1/f fluctuations of the heart rate.
MedLine Citation:
PMID:  7993853     Owner:  NLM     Status:  MEDLINE    
We have developed a system to analyze heart rate variability (HRV) (power spectral array of the HRV) during 24 h ambulatory electrocardiographic monitoring. Several rhythms (circadian and several ultradian rhythms) were observed in the power spectral array of the heart rates and 1/f-like fluctuations in the log-log scaled heart rate power spectrum. The circadian change of the heart rate is closely related to the body temperature rhythm. The 90 min rhythm of HRV during sleep was suspected to be produced by the sleep cycle (REM/NREM) and the lower frequency peak of the HRV was coherent with oscillation in amplitude modulated respiration. These circadian and ultradian rhythm as assessed by heart rate variability exist both in normal subjects and in patients with autonomic failure. The power of the high frequency band decreases in subjects with autonomic failure. The power of low frequency components increases during periodic breathing or Cheyne-Stokes respiration. Log-log scaled analysis of the power spectrum of HRV disclosed that the slope of the HRV is markedly modulated by the range of the frequency applied for the least square regression line analysis. The increased power that might be produced by periodic breathing and decreased power in patients with autonomic failure might strongly modulate the slope of the log-log scaled HRV. It is concluded that the power spectral array of the HRV during 24 h period is useful in the detection of circadian and ultradian rhythm, and log-log scaled power spectra might be useful in the overall integration of the heart rate dynamics produced by the central nervous system. The several rhythm factors that might be produced by the central nervous system might modulate 1/f fluctuations of the HRV.
Y Ichimaru; S Katayama
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering     Volume:  6     ISSN:  0921-3775     ISO Abbreviation:  Front Med Biol Eng     Publication Date:  1994  
Date Detail:
Created Date:  1995-01-17     Completed Date:  1995-01-17     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9011464     Medline TA:  Front Med Biol Eng     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  117-30     Citation Subset:  IM    
Department of Neurology, Dokkyo University School of Medicine, Shimotsuga, Japan.
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MeSH Terms
Body Temperature / physiology
Central Nervous System / physiology*
Circadian Rhythm / physiology*
Electrocardiography, Ambulatory
Heart Rate / physiology*
Reference Values
Shy-Drager Syndrome / diagnosis,  physiopathology
Signal Processing, Computer-Assisted*
Sleep Apnea Syndromes / diagnosis,  physiopathology
Sleep Stages / physiology

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