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rdf:type |
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lifeskim:mentions |
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pubmed:dateCreated |
2004-5-10
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pubmed:abstractText |
The aim of this study was to explore the principal frequency components of the heart rate and blood pressure variability in the low frequency (LF) and very low frequency (VLF) band. The spectral composition of the R-R interval (RRI) and systolic arterial blood pressure (SAP) in the frequency range below 0.15 Hz were carefully analyzed using three different spectral methods: Fast Fourier transform (FFT), Wigner-Ville distribution (WVD), and autoregression (AR). All spectral methods were used to create time-frequency plots to uncover the principal spectral components that are least dependent on time. The accurate frequencies of these components were calculated from the pole decomposition of the AR spectral density after determining the optimal model order--the most crucial factor when using this method--with the help of FFT and WVD methods.
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pubmed:commentsCorrections |
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-11179406,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-1860193,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-1928405,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-2210809,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-2807315,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-2874900,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-2912176,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-4051021,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-4940430,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-6166045,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-7768574,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-7840304,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-9336376,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-9577947,
http://linkedlifedata.com/resource/pubmed/commentcorrection/14552660-9616258
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pubmed:language |
eng
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pubmed:journal |
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pubmed:citationSubset |
IM
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pubmed:status |
MEDLINE
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pubmed:month |
Oct
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pubmed:issn |
1472-6793
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pubmed:author |
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pubmed:issnType |
Electronic
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pubmed:day |
13
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pubmed:volume |
3
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
11
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pubmed:dateRevised |
2009-11-18
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pubmed:meshHeading |
pubmed-meshheading:14552660-Adult,
pubmed-meshheading:14552660-Blood Flow Velocity,
pubmed-meshheading:14552660-Blood Pressure,
pubmed-meshheading:14552660-Blood Pressure Determination,
pubmed-meshheading:14552660-Echocardiography,
pubmed-meshheading:14552660-Fourier Analysis,
pubmed-meshheading:14552660-Heart Rate,
pubmed-meshheading:14552660-Humans,
pubmed-meshheading:14552660-Image Interpretation, Computer-Assisted,
pubmed-meshheading:14552660-Models, Cardiovascular
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pubmed:year |
2003
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pubmed:articleTitle |
Fine structure of the low-frequency spectra of heart rate and blood pressure.
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pubmed:affiliation |
Department of Physics, University of Turku, 20014 Turku, Finland. tom.kuusela@utu.if
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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