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  • Title: Gastric myoelectric activity during low frequency oscillation.
    Author: Holmes SR, Griffin MJ.
    Journal: Aviat Space Environ Med; 2000 Apr; 71(4):420-5. PubMed ID: 10766468.
    Abstract:
    BACKGROUND: The normal 3 cycles per minute (3 c/m) resting activity of the stomach has been reported to shift into the range of 4-9 c/m (tachyarrhythmia) in subjects with symptoms of motion sickness. Previous studies have provoked motion sickness with an optokinetic stimulus and have not normally reported changes relative to a control condition. The present experiment investigated changes in the electrogastrogram (EGG) during a control condition and during exposure to 0.125 Hz off-axis yaw oscillation of the body. METHODS: There were 16 male subjects who participated in the two conditions 1 wk apart. The electrogastrogram, respiration rate and subjective ratings of sickness were monitored throughout both conditions. Spectral analysis of the EGG time histories provided measures of 3 c/m power and tachyarrhythmia power, which were also expressed as a percentages of EGG power over the total EGG frequency range (0.04 to 0.16 Hz.). The median frequency of the EGG over this bandwidth was also calculated. RESULTS: During motion exposure, the median frequency of the EGG and the percentage tachyarrhythmia power increased and the percentage 3 c/m power decreased relative to a pre-exposure baseline period and relative to the static control condition. CONCLUSIONS: Low frequency off-axis yaw oscillations disrupted the normal resting gastric myoelectric activity relative to a control condition.
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