[Long-range correlations in human colonic pressure activity].
Using the method of detrended fluctuation analysis (DFA) and power spectral analysis (PSA), the paper deals with the characteristics of long-range correlations of colonic pressure activities and their surrogate data of healthy subjects. The DFA is a period representation of such correlations, whereas the PSA is a frequency representation. The analysis of the two methods consistently shows that there are long memories in colonic pressure activities and there exist long-range correlations, whereas there are no such long memories and long-range correlations in the surrogate data, whose sequential orders are randomly shuffled. The results to some extent indicate that human colonic pressure activities with normal motilities do have long memories, but these memories may be weaker or may even be destroyed with dysmotilities.
Yan
Rongguo
R
School of Medical Instrumentation and Food Engineering, Shanghai University for Science and Technology, Shanghai 200093, China. yanrongguo@sjtu.edu.cn
Yan
Guozheng
G
Zhang
Wenqiang
W
D000328:Adult; D003106:Colon / Q000502:physiology*; D003627:Data Interpretation, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011312:Pressure; D012815:Signal Processing, Computer-Assisted