Effect of psychological stress on gastric motility assessed by electrical bio-impedance  

作　　者：María Raquel Huerta-Franco Miguel Vargas-Luna Juana Berenice Montes-Frausto Ismael Morales-Mata Lorena Ramirez-Padilla 

机构地区：[1]Department of Applied Sciences to Work,Health Science Division,University of Guanajuato,37320 Leon,Guanajuato,Mexico [2]Department of Physical Engineering,Science and Engineering Division,University of Guanajuato,37150 Leon,Guanajuato,Mexico

出　　处：《World Journal of Gastroenterology》2012年第36期5027-5033,共7页世界胃肠病学杂志（英文版）

基　　金：Supported by Research and Graduate Department,2008-2010, University of Guanajuato

摘　　要：AIM:To evaluate gastric motility using electrical bioimpedance(EBI) and gastric changes as a result of stress induced by psychological tests.METHODS:A group of 57 healthy women,aged 40-60 years,was recruited,and a clinical history and physical examination were performed.The women were free from severe anxiety,chronic or acute stress,severe depression,mental diseases and conditions that affect gastric activity.The women were evaluated under fasting conditions,and using a four-electrode configuration,the gastric signals were obtained through a BIOPAC MP-150 system.The volunteers were evaluated using the following paradigm:basal state,recording during the Stroop Test,intermediate resting period,recording during the Raven Test,and a final resting period.We analyzed the relative areas of the frequency spectrum:A1(1-2 cpm),A2(2-4 cpm),A3(4-8 cpm),and A4(8-12 cpm),as well as the median of area A2 + A3.The data were analyzed by an autoregressive method using a Butterworth filter with MatLab and Origin.Analysis of variance(ANOVA) and Friedman ANOVA(for nonparametric variables) were performed;in addition,pairs of groups were compared using the T dependent and Wilcoxon T tests.RESULTS:The results of the main values of area A2 were not significantly different comparing the five steps of the experimental paradigm.Nevertheless,there was a tendency of this A2 region to decrease during the stress tests,with recuperation at the final resting step.When an extended gastric region was considered(1-4 cpm),significant differences with the psychological stress tests were present(F = 3.85,P = 0.005).The A3 region also showed significant changes when the stress psychological tests were administered(F = 7.25,P < 0.001).These differences were influenced by the changes in the adjacent gastric region of A2.The parameter that we proposed in previous studies for the evaluation of gastric motility by electrical bio-impedance(EBI) was the median of the area under the region from 2 to 8 cpm(A2 + A3).The mean values of these frequencies(median of AIM： To evaluate gastric motility using electrical bio- impedance （EBI） and gastric changes as a result of stress induced by psychological tests. METHODS： A group of 57 healthy women, aged 40-60 years, was recruited, and a clinical history and physi- cal examination were performed. The women were free from severe anxiety, chronic or acute stress, severe de- pression, mental diseases and conditions that affect gas- tric activity. The women were evaluated under fasting conditions, and using a four-electrode configuration, the gastric signals were obtained through a BIOPAC MP-150 system. The volunteers were evaluated using the follow- ing paradigm： basal state, recording during the Stroop Test, intermediate resting period, recording during the Raven Test, and a final resting period. We analyzed the relative areas of the frequency spectrum： A1 （1-2 cpm）, A2 （2-4 cpm）, A3 （4-8 cpm）, and A4 （8-12 cpm）, as well as the median of area A2 ＋ A3. The data were analyzed by an autoregressive method using a Butterworth filter with MatLab and Origin. Analysis of variance （ANOVA） and Friedman ANOVA （for nonparametric variables） were performed; in addition, pairs of groups were compared using the Tdependent and Wilcoxon Ttests. RESULTS： The results of the main values of area A2 were not significantly different comparing the five steps of the experimental paradigm. Nevertheless, there was a tendency of this A2 region to decrease during the stress tests, with recuperation at the final resting step. When an extended gastric region was considered （1-4 cpm）, significant differences with the psychological stress tests were present （F = 3.85, P = 0.005）. The A3 region also showed significant changes when the stress psychological tests were administered （F = 7.25, P 〈 0.001）. These differences were influenced by the chang- es in the adjacent gastric region of A2. The parameter that we proposed in previous studies for the evaluation of gastric motility by electrical bio-impedance （EBI

关 键 词：Psychological stress BIO-IMPEDANCE Gas-tric motility 

分 类 号：R395[哲学宗教—心理学]