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Transfer function analysis of heart rate variability correlated with gastric myoelectrical activity using a liquid
Chien-Lin Chen1, Cheryl C H Yang, Terry B J Kuo
1Department of Medicine, Buddhist Tzu Chi Hospital and University, School of Medicine, Hualien 970, Taiwan, ROC.
Abstract:
We aimed to investigate difference in the effects of water and a liquid nutritional meal on the parasympathetic and gastric myoelectrical activities. The study was a repeated-measures design in which each subject was presented with 500 ml of water and a liquid nutritional meal (Ensure) on two separate and random sessions. The electrogastrography (EGG) and electrocardiogram were simultaneously recorded in 16 healthy subjects. There were no significant changes in the EGG-3 cycle per minute (cpm) power, any HRV variable, or the transfer function magnitude after Ensure intake. Water ingestion resulted in a significant increase in both the EGG-3 cpm power and the transfer magnitude compared to Ensure intake (P < 0.05). The effects of water and Ensure on the parasympathetic and gastric electric activities are different, in which the latter is less likely to provoke an autonomic response after gastric stimulation.
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