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  • 1
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    Effects of eating on vection-induced motion sickness, cardiac vagal tone, and gastric myoelectric activity (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: This study investigated the effect of food ingestion on motion sickness severity and its physiological mechanisms. Forty-six fasted subjects were assigned either to a meal group or to a no-meal group. Electrogastrographic (EGG) indices (normal 3 cpm activity and abnormal 4-9 cpm tachyarrhythmia) and respiratory sinus arrhythmia (RSA) were measured before and after a meal and during a subsequent exposure to a rotating drum in which illusory self-motion was induced. The results indicated that food intake enhanced cardiac parasympathetic tone (RSA) and increased gastric 3 cpm activity. Postprandial effects on motion sickness severity remain equivocal due to group differences in RSA baseline levels. During drum rotation, dysrhythmic activity of the stomach (tachyarrhythmia) and vagal withdrawal were observed. Furthermore, high levels of vagal tone prior to drum rotation predicted a low incidence of motion sickness symptoms, and were associated positively with gastric 3 cpm activity and negatively with tachyarrhythmia. These data suggest that enhanced levels of parasympathetic activity can alleviate motion sickness symptoms by suppressing, in part, its dysrhythmic gastric underpinnings.
    Keywords: Aerospace Medicine
    Type: Psychophysiology (ISSN 0048-5772); Volume 29; 2; 193-201
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Electrical acustimulation relieves vection-induced motion sickness (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The aim of this study was to examine the effects of electrical acustimulation on gastric myoelectric activity and severity of symptoms of motion sickness. In experiment 1, 16 Chinese subjects received electrical acustimulation in one of two sessions. In experiment 2, 45 white and black American subjects were randomly divided into three groups: acustimulation, sham acustimulation, and control. Each subject sat in an optokinetic drum for 15 minutes baseline and 15 minutes of drum rotation. Subjects' electrogastrograms and subjective symptoms of motion sickness were obtained. In experiment 1, the mean symptom score and tachyarrhythmia during acustimulation sessions were significantly lower than during no-acustimulation sessions. In experiment 2, the mean symptom score of the acustimulation group was significantly lower than that of the sham-stimulation group and the control group; tachyarrhythmia in the acustimulation group was significantly less than that of the control group but not the sham-stimulation group. In conclusion, electrical acustimulation reduces the severity of symptoms of motion sickness and appears to decrease gastric tachyarrhythmia.
    Keywords: Aerospace Medicine
    Type: Gastroenterology (ISSN 0016-5085); Volume 102; 6; 1854-8
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Gastric dysrhythmias and the current status of electrogastrography (1989)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Myoelectrical activity recorded simultaneously from mucosal, serosal, and cutaneous electrodes has confirmed that the 3-cpm signal from such electrodes reflects gastric slow-wave activity. Now, the observation that patients with unexplained nausea and vomiting may have very rapid slow-wave frequencies (tachygastrias) and very slow, slow-wave frequencies (bradygastrias) suggests that electrogastrography, a reliable and noninvasive technique, may be useful in the diagnosis and management of patients with upper abdominal symptoms and gastroparesis.
    Keywords: Aerospace Medicine
    Type: Practical gastroenterology (ISSN 0277-4208); Volume 13; 4; 37, 41-44
    Format: text
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    NASA TECHNICAL REPORTS
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