Influence of change in posture on the gastric myoelectrical activity in healthy subjects

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Abstract Gastric motor activity is enhanced by increasing parasympathetic nerve activity. However, it is not known whether position changes affect the gastric myoelectrical activity. This study investigated whether the change from sitting to supine alters gastric myoelectrical activity using the electrogastrogram (EGG) technique. Eight healthy males participated in this study. They were tested in the sitting position for 20 minutes and then in the supine position 20 minutes. The EGG signals were analyzed using fast Fourier transformation, and we compared peak amplitude and frequency. The parasympathetic nerve activity was evaluated using the high-frequency (HF) components in the heart rate variability from electrocardiogram. The change in posture increased the amplitude of EGG, while the peak frequency did not differ in the two positions. The position change increased the HF components. These results suggest that it is necessary to keep the same body position for an accurate clinical evaluation of gastric myoelectrical activity.
山形県立米沢女子短期大学の論文