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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
5 Pt 2
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pubmed:dateCreated |
1998-6-24
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pubmed:abstractText |
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.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:status |
MEDLINE
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pubmed:month |
May
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pubmed:issn |
0002-9513
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
274
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
H1465-71
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:9612351-Adolescent,
pubmed-meshheading:9612351-Adult,
pubmed-meshheading:9612351-Aged,
pubmed-meshheading:9612351-Electrocardiography,
pubmed-meshheading:9612351-Female,
pubmed-meshheading:9612351-Heart Rate,
pubmed-meshheading:9612351-Humans,
pubmed-meshheading:9612351-Male,
pubmed-meshheading:9612351-Middle Aged,
pubmed-meshheading:9612351-Models, Biological,
pubmed-meshheading:9612351-Models, Theoretical,
pubmed-meshheading:9612351-Predictive Value of Tests
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pubmed:year |
1998
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pubmed:articleTitle |
Temporally localized contributions to measures of large-scale heart rate variability.
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pubmed:affiliation |
Cardiovascular Research Group, University of Calgary, Alberta, Canada.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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