Correlations between the responses of electrogastrograms, heart rate and respiratory rate to the stress of the mirror drawing test in human subjects

Abstract

Original C o r r e l a t i o n s b e t w e e n t h e r e s p o n s e s o felectrogastrograms, heart rate and respiratory rate to the stress of the mirror drawing test in human subjects AbstractAn electrogastrogram (EGG) recorded on the skin is believed to reflect the electrical activity of the gastrointestinal tract. In this study, linear correlations were calculated for the EGG spectral frequencies and the power ratios, changes in heart and respiratory rate before and during mirror drawing test (MDT) stress and after having meals, with the changes in the sympathetic tone indicator (LF/HF) and HADS anxiety and depression scores in human subjects (n=48). Depression scores had a negative linear correlation with the EGG resting frequencies of the epigastric and supraumbilical 6 cpm groups (5.0-7.4 cpm). Anxiety scores had a positive linear correlation with the EGG area power ratio of the resting to MDT stress responses of the epigastric and infraumbilical 6 cpm groups (6 cpm area during MDT/that during fasting rest). The resting LF/HF had a positive linear correlation with the EGG area power ratio of the resting to MDT stress responses of the epigastric and infraumbilical 3 cpm groups (2.5-4.9 cpm). The resting LF/HF ratio had a negative correlation with the area power ratio of the resting to postprandial responses (postprandial power/resting power) in the epigatric, supraumbilical and infraumbilical 6 cpm groups. The resting LF/HF ratio had a positive linear correlation with the heart rate at rest and during MDT-stress. In contrast, the resting LF/HF ratio had a negative linear correlation with the respiratory rate at rest and during MDT-stress. EGGs of the surface electrical activities of the gastrointestinal tract were influenced by acute MDT-stress and their frequencies and their response power ratios were correlated linearly with anxiety scores, depression scores and the sympathetic tone indicator, the LF/HF ratio.

Local differences in electrogastrographic responses to the stress of the mirror drawing test (MDT) as determined by multichannel electrogastrography

“…In fact, stress induces dual excitatory and inhibitory effects on gastrointestinal activity Enck, 1991: Musial andEnck, 1993). We have previously reported the effects of acute stress of MDT on the gastric and colonic facilitation and inhibition with EGG (Homma, 2005(Homma, , 2006(Homma, , 2009.…”

“…To make topographic EGG maps, the electrode positions were represented by two-dimensional standard coordinates, Xi and Yi, and a spectral peak at a certain electrode position was expressed as Zi = (Xi,Yi) (Homma, 1997: Homma et al, 1999: Homma, 2006. Thereafter, the contour map program (Shiono et al, 1988) was applied and EGG maps were drawn for the power content ratio (Homma, 1997).…”

“…In addition, the electromyographic activity of an EGG has been shown to partially reflect gastro-intestinal motility (Smout et al, 1980;Mintchef and Bowes, 1997). Therefore, it is possible to record the effects of stress on gastrointestinal activity using EGG (Homma, 2005(Homma, , 2006(Homma, , 2009. We have previously reported the facilitation or inhibition of gastrointestinal activity by recording the EGG at 16 locations on the thoraco-abdominal surface, by means of 1) the peak power ratio (peak power during MDT/peak power at rest) at locations in each of the epigastric (CHI), supraumbilical (CHII) and infraumbilical regions (CHIII) and of 2) the maximal power foci (MPFs) obtained from each of 16 locations (Homma, 2005).…”

Evaluation of Comfortable Spaces for Women Using Virtual Environment

“…However, it should be mentioned that the differences in values in Fig. 7 may be subtle, because the value of LF/HF may range from 0 to 7 [12].…”

Gastrointestinal influence on the electrophysiology of the heart: induction of cardiac arrhythmic episodes by myoelectrical uncoupling within the gut

“…In studies of response to stress using the mirror drawing test (MDT), in which the subject traces along the edge of a metal star reflected in a mirror, it has been shown that resting scores associated with depression had a negative linear correlation with respect to EGG frequency, while the anxiety scores demonstrated a positive linear relation with respect to EGG area power ratio (Homma, 2006). This research also showed that acute stress had a correlated effect on the GEA of visceral smooth muscle evidenced by EGG.…”