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Salivary changes associated with seasickness.

C R Gordon1, H Ben-Aryeh, R Szargel

  • 1Motion Sickness and Human Performance Laboratory, Israel Naval Hyperbaric Institute, Haifa.

Journal of the Autonomic Nervous System
|February 1, 1989
PubMed
Summary
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Seasickness reduces saliva flow and alters its composition, with lower potassium and higher sodium levels correlating with severity. These findings challenge traditional views on salivation during seasickness.

Area of Science:

  • Physiology
  • Human Physiology
  • Marine Medicine

Background:

  • Seasickness is a common condition with complex physiological responses.
  • Traditional understanding suggests increased salivation during motion sickness.
  • Objective biomarkers for seasickness severity are needed.

Purpose of the Study:

  • To investigate salivary changes in healthy males during a real seasickness event.
  • To correlate salivary parameters with the severity of seasickness symptoms.

Main Methods:

  • Salivary composition and flow rate were measured in 13 healthy male volunteers.
  • Measurements included whole unstimulated and stimulated saliva.
  • Subjects were exposed to a real seasickness-inducing environment at sea.

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Main Results:

  • Salivary flow rates (unstimulated and stimulated) were significantly reduced in approximately 80% of subjects at sea.
  • Reduced salivary flow rate showed a negative correlation with seasickness severity.
  • Potassium concentration decreased, while sodium concentration increased in saliva.
  • Salivary sodium and protein concentrations positively correlated with seasickness severity.

Conclusions:

  • The study findings contradict the traditional concept of increased salivation during seasickness.
  • Objective salivary measurements, including flow rate and composition, can serve as valuable indicators for evaluating seasickness syndrome.
  • These salivary biomarkers offer a novel approach to assessing seasickness severity.