Document Detail

Vestibular and cardiac reactions to open-sea exposure.
MedLine Citation:
PMID:  1342389     Owner:  NLM     Status:  MEDLINE    
Nineteen healthy male volunteers were exposed to a 72-hour open-sea stay in a lifeboat in order to study whether randomized protracted stimulation of different parts of the vestibular system would cause a decrease of vestibular activity as assessed by unilateral calorization of the horizontal vestibular canal. The influence on the autonomic nervous system was investigated by calculating the heart rate by the R-R intervals at ECG at rest and at maximum speed of the nystagmus slow phase. Calorization and ECG investigations were performed immediately before and after the open-sea exposure. Seven healthy males who were not exposed to the open sea served as controls. They were investigated in the same manner as the test subjects, that is twice, 3 days apart. All test subjects experienced seasickness. After the sea stay, the caloric nystagmus response had decreased significantly more than in the controls. In 7 subjects with the most pronounced vestibular habituation, the resting heart rate decreased significantly after the sea exposure. Caloric stimulation of the labyrinths did not cause any specific change of the heart rate. It is concluded that prolonged open-sea exposure causes vestibular habituation to unilateral labyrinthine stimulation. Furthermore, there are some indications that the mechanism that is responsible for vestibular habituation to some extent influences the function of the autonomic nervous system, resulting in a decreased pulse rate.
O I Kolev; L Tibbling
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of vestibular research : equilibrium & orientation     Volume:  2     ISSN:  0957-4271     ISO Abbreviation:  J Vestib Res     Publication Date:  1992  
Date Detail:
Created Date:  1994-02-10     Completed Date:  1994-02-10     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  9104163     Medline TA:  J Vestib Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  153-7     Citation Subset:  IM; S    
Department of Otoneurology, Institute of Neurology, Psychiatry and Neurosurgery, Sofia, Bulgaria.
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MeSH Terms
Autonomic Nervous System / physiology
Caloric Tests
Habituation, Psychophysiologic / physiology*
Heart Rate*
Motion Sickness / physiopathology*
Nystagmus, Physiologic
Oceans and Seas
Vestibule, Labyrinth / physiology*

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