Document Detail

Temporal contribution of body movement to very long-term heart rate variability in humans.
MedLine Citation:
PMID:  10749695     Owner:  NLM     Status:  MEDLINE    
A newly developed, very long-term ( approximately 7 days) ambulatory monitoring system for assessing beat-to-beat heart rate variability (HRV) and body movements (BM) was used to study the mechanism(s) responsible for the long-period oscillation in human HRV. Data continuously collected from five healthy subjects were analyzed by 1) standard auto- and cross-spectral techniques, 2) a cross-Wigner distribution (WD; a time-frequency analysis) between BM and HRV for 10-s averaged data, and 3) coarse-graining spectral analysis for 600 successive cardiac cycles. The results showed 1) a clear circadian rhythm in HRV and BM, 2) a 1/f (beta)-type spectrum in HRV and BM at ultradian frequencies, and 3) coherent relationships between BM and HRV only at specific ultradian as well as circadian frequencies, indicated by significant (P < 0.05) levels of the squared coherence and temporal localizations of the covariance between BM and HRV in the cross-WD. In a single subject, an instance in which the behavioral (mean BM) and autonomic [HRV power >0.15 Hz and mean heart rate (HR)] rhythmicities were dissociated occurred when the individual had an irregular daily life. It was concluded that the long-term HRV in normal humans contained persistent oscillations synchronized with those of BM at ultradian frequencies but could not be explained exclusively by activity levels of the subjects.
N Aoyagi; K Ohashi; S Tomono; Y Yamamoto
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of physiology. Heart and circulatory physiology     Volume:  278     ISSN:  0363-6135     ISO Abbreviation:  Am. J. Physiol. Heart Circ. Physiol.     Publication Date:  2000 Apr 
Date Detail:
Created Date:  2000-04-27     Completed Date:  2000-04-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100901228     Medline TA:  Am J Physiol Heart Circ Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H1035-41     Citation Subset:  IM    
Educational Physiology Laboratory, Graduate School of Education, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
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MeSH Terms
Circadian Rhythm / physiology*
Electrocardiography, Ambulatory / methods*
Heart Rate / physiology*
Movement / physiology*
Time Factors
Vagus Nerve / physiology

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

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