Document Detail

Temporally localized contributions to measures of large-scale heart rate variability.
MedLine Citation:
PMID:  9612351     Owner:  NLM     Status:  MEDLINE    
The purpose of this work was to determine the temporal origins of the standard deviation of successive 5-min mean heart period sequences (SDANN) and the power of the ultralow-frequency (ULF) spectral band (< 0.0033 Hz). We hypothesized that SDANN and ULF might have their origins in changes in human activity rather than slow oscillatory rhythms. Heart period sequences were obtained from 24-h Holter electrocardiograms of 10 healthy ambulatory subjects. There was no evidence of any persistent oscillation within the ULF band. Using moving 4-h windows in short-time Fourier transforms, we showed that the amplitude of ULF fluctuated markedly, particularly during times bordering sleep. The local ULF amplitude correlated (r = 0.59 +/- 0.09) with large-scale changes in heart period quantified with 2- and 4-h wavelet transforms. Local SDANN also fluctuated, mainly around times of sleep. Although the 24-h SDANN and ULF values correlated highly, there was little correlation between their temporal distributions (r = 0.10 +/- 0.25). The temporal distributions of measures of long-range heart period variability suggest that they reflect changes in human activity levels.
D Roach; A Sheldon; W Wilson; R Sheldon
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of physiology     Volume:  274     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1998 May 
Date Detail:
Created Date:  1998-06-24     Completed Date:  1998-06-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H1465-71     Citation Subset:  IM    
Cardiovascular Research Group, University of Calgary, Alberta, Canada.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Electrocardiography / methods*
Heart Rate*
Middle Aged
Models, Biological*
Models, Theoretical*
Predictive Value of Tests

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

Previous Document:  Ischemia-induced phosphorylation and translocation of stress protein alpha B-crystallin to Z lines o...
Next Document:  Cardiovascular responses attenuate with repeated NO synthesis inhibition in conscious fetal sheep.