Document Detail

Methods in heart rate variability analysis: which tachogram should we choose?
MedLine Citation:
PMID:  8275679     Owner:  NLM     Status:  MEDLINE    
We investigated the practical impact of the representation of the cardiac rhythm--the cardiotachogram--on two elementary spectral indexes in heart rate variability analysis: the low-frequency (0.07-0.14 Hz) and high-frequency (0.14-0.40 Hz) powers. Five commonly used tachograms (inter-beat interval function/series, counts, instantaneous heart rate function/series) were compared. Measurements were done on seven volunteers in the supine and standing positions. Ratios, and their deviations from 100%, of alternative power values were calculated. Mean low-frequency and high-frequency ratio deviations ranged from 0 to 5% and from 6 to 37%. The spectrum of counts yielded on average more (15-37%) high-frequency power. Spectra were incomparable without normalization of the tachogram with respect to heart rate. In conclusion, (i) the choice of a particular spectrum may lead to differing conclusions on the vagal contribution to heart rate variability and (ii) inconclusive results from studies using different tachogram variants can partly be due to the omission of normalization.
M J Janssen; C A Swenne; J de Bie; O Rompelman; J H van Bemmel
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Computer methods and programs in biomedicine     Volume:  41     ISSN:  0169-2607     ISO Abbreviation:  Comput Methods Programs Biomed     Publication Date:  1993 Sep 
Date Detail:
Created Date:  1994-02-08     Completed Date:  1994-02-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8506513     Medline TA:  Comput Methods Programs Biomed     Country:  IRELAND    
Other Details:
Languages:  eng     Pagination:  1-8     Citation Subset:  IM    
Department of Cardiology, Leiden University Hospital, Netherlands.
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MeSH Terms
Electrocardiography, Ambulatory
Heart Rate / physiology*
Monitoring, Physiologic / methods
Reference Values
Reproducibility of Results
Sensitivity and Specificity

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

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