Document Detail

Wavelet analysis of scaling properties of gastric electrical activity.
MedLine Citation:
PMID:  16794018     Owner:  NLM     Status:  MEDLINE    
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.
Bruce J West; Artur Maciejewski; Miroslaw Latka; Tadeusz Sebzda; Zbigniew Swierczynski; Sylwia Cybulska-Okolow; Eugeniusz Baran
Related Documents :
17693118 - Ecg compression using uniform scalar dead-zone quantization and conditional entropy cod...
19162828 - Multiclass voluntary facial expression classification based on filter bank common spati...
20126248 - Fractional fourier transform of flat-topped multi-gaussian beams.
23546278 - Shifted dispersion-induced radio-frequency fading in microwave photonic filters using a...
14710828 - Laser power dependence of mass spectral signatures from individual bacterial spores in ...
2807768 - Connectionism and an inescapable defect.
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    
Mathematical and Information Science Directorate, Army Research Office, Research Triangle Park, NC 27709-2211, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Electrodiagnosis / methods*
Fourier Analysis*
Gastrointestinal Motility / physiology*
Middle Aged
Models, Biological
Muscle Contraction
Scleroderma, Systemic / physiopathology
Stomach / physiology*,  physiopathology

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

Previous Document:  Cardiopulmonary resuscitation in a rat model of chronic myocardial ischemia.
Next Document:  Changes in tissue water content measured with multiple-frequency bioimpedance and metabolism measure...