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

Figure 1 Raw data of the gastric bio-impedance signal showing mainly the breathing oscillations (fast oscillations) and the gastric contribution (2-4/min), which are shown by the dashed curve. AU: Arbitrary units.

Figure 2 Typical frequency spectrum of the electrical bio-impedance gastric signal. The three curves show the typical changes during the tests (Stroop Test in this example): series 1: solid line, before the test; series 2: dotted line, during the test; series 3: dashed line after the test. AU: Arbitrary units.

Figure 3 Changes in the relative area under the frequency spectrum of the gastric electrical bio-impedance signal (mean ± SE). A: From 2 to 4 cpm; B: From 1 to 4 cpm; C: From 4 to 8 cpm; D: Median of the area from 2 to 8 cpm. Basal: Basal gastric motility recording; Stroop: Recording during the Stroop Test; IRP: Intermediate resting period; Raven: Recording during the Raven test; FRP: Final resting period.

Figure 4 Changes in the relative area under the frequency spectrum of the gastric electrical bio-impedance signal from 8 to 12 cpm (median and interquartile range). Basal: Basal gastric motility recording; Stroop: Recording during the Stroop Test; IRP: Intermediate resting period; Raven: Recording during the Raven Test; FRP: Final resting period.