Document Detail


Wavelet analysis of scaling properties of gastric electrical activity.
MedLine Citation:
PMID:  16794018     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We present a novel approach to the analysis of fluctuations in human myoelectrical gastric activity measured noninvasively from the surface of the abdomen. The time intervals between successive maxima of the wavelet transformed quasi-periodic electrogastrographic waveform define the gastric rate variability (GRV) time series. By using the method of average wavelet coefficients, the statistical fluctuations in the GRV signal in healthy individuals are determined to scale in time. Such scaling was previously found in a variety of physiological phenomena, all of which support the hypothesis that physiological dynamics utilize fractal time series. We determine the scaling index in a cohort of 17 healthy individuals to be 0.80 +/- 0.14, which compared with a set of surrogate data is found to be significant at the level P < 0.01. We also determined that the dynamical pattern, so evident in the spectrum of average wavelet coefficients of the GRV time series of healthy individuals, is significantly reduced in a cohort of systemic sclerosis patients having a scaling index 0.64 +/- 0.17. These results imply that the long-term memory in GRV time series is significantly reduced from healthy individuals to those with systemic sclerosis. Consequently, this disease degrades the complexity of the underlying gastrointestinal control system and this degradation is manifest in the loss of scaling in the GRV time series.
Authors:
Bruce J West; Artur Maciejewski; Miroslaw Latka; Tadeusz Sebzda; Zbigniew Swierczynski; Sylwia Cybulska-Okolow; Eugeniusz Baran
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Publication Detail:
Type:  Journal Article     Date:  2006-06-22
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  101     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2006 Nov 
Date Detail:
Created Date:  2006-10-17     Completed Date:  2006-11-28     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1425-31     Citation Subset:  IM    
Affiliation:
Mathematical and Information Science Directorate, Army Research Office, Research Triangle Park, NC 27709-2211, USA. Bruce.J.West@us.army.mil
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Electrodiagnosis / methods*
Female
Fourier Analysis*
Fractals
Gastrointestinal Motility / physiology*
Humans
Male
Middle Aged
Models, Biological
Muscle Contraction
Periodicity
Scleroderma, Systemic / physiopathology
Stomach / physiology*,  physiopathology

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


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