Document Detail

Assessment of autonomic function using complex demodulation and posture entrainment techniques: an application to normal subjects and diabetic patients.
MedLine Citation:
PMID:  8679498     Owner:  NLM     Status:  MEDLINE    
The assessment of autonomic nervous systems (sympathetic and parasympathetic) using the method of complex demodulation and posture entrainment are presented. The heart rate variability signals were derived from the ECG of normal subjects and diabetic patients in both supine and standing positions. The method of complex demodulation is employed on the heart rate variability data for both groups. Two significant bands in the heart rate variability spectrum were investigated by this technique. The amplitude of the high frequency band (0.181-0.4 Hz) showed the parasympathetic changes in normal subjects and, to a lesser extent, in the diabetic patients. The amplitude of the low frequency band (0.03-0.15 Hz) showed the influence of sympathetic changes in both groups. The complex demodulation method indicated the effect of high frequency and low frequency bands on both divisions of autonomic function in regulating the heart rate variability in both normal subjects and diabetic patients. In the supine position, the parasympathetic and sympathetic were balanced. On standing (posture entrainment), the high frequency band showed a decrease in amplitude due to decreased parasympathetic activity, while the low frequency band showed an increase in amplitude, which indicated an increase in sympathetic activity. These patterns were repeated in both normal subjects and diabetic patients. It seems that the use of posture entrainment combined with the complex demodulation method is significant to characterize, assess and quantify the autonomic function in health and disease.
A Kamal
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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:  7     ISSN:  0921-3775     ISO Abbreviation:  Front Med Biol Eng     Publication Date:  1996  
Date Detail:
Created Date:  1996-08-16     Completed Date:  1996-08-16     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:  1-10     Citation Subset:  IM; S    
Department of Electrical Engineering, University of Bahrain, Isa Town, Bahrain.
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MeSH Terms
Autonomic Nervous System / physiology*
Autonomic Nervous System Diseases / complications,  physiopathology
Diabetes Complications
Diabetes Mellitus / physiopathology*
Diabetic Neuropathies / complications,  physiopathology
Electrocardiography / methods*
Heart Rate*
Middle Aged
Models, Neurological
Posture / physiology*
Supine Position / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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