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Vestibular findings in professional divers.
Z Sharoni1, A Shupak, O Spitzer
1Israel Naval Medical Institute, Israel Defense Forces Medical Corps, and the Department of Otolaryngology--Head and Neck Surgery, Carmel Medical Center, Haifa.
The Annals of Otology, Rhinology, and Laryngology
|February 24, 2001
Summary
Professional divers show altered inner ear function, specifically reduced vestibular responses. This suggests a habituation process enhancing the canal-ocular system
Area of Science:
- Otolaryngology
- Neuroscience
- Physiology
Background:
- Professional diving involves significant pressure changes affecting the inner ear.
- Auditory and vestibular functions are crucial for diver safety and performance.
- Understanding long-term effects on the inner ear is vital for occupational health.
Purpose of the Study:
- To investigate potential auditory and vestibular changes in asymptomatic professional divers.
- To compare inner ear function between professional divers and non-diver controls.
- To explore habituation as a mechanism for altered vestibular responses.
Main Methods:
- Auditory function assessed via pure tone hearing thresholds.
- Vestibular function evaluated using smooth harmonic acceleration tests.
- Comparison of results between 13 professional divers and 12 non-diver controls.
Main Results:
- Divers exhibited slightly elevated pure tone hearing thresholds (not clinically significant).
- Significantly lower phase leads in smooth harmonic acceleration tests were observed in divers at low frequencies (0.01, 0.02, 0.04 Hz).
- These findings suggest prolonged vestibulo-ocular reflex time constants in divers.
Conclusions:
- Professional diving may induce adaptive changes in the vestibular system.
- Habituation appears to enhance the low-frequency response of the canal-ocular system.
- These adaptations could be a protective mechanism against diving-related inner ear stress.