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Vestibular evoked myogenic potentials and saccular plasticity in divers
Haim Lavon1, Dror Tal, Gil Kaminski-Graif
1Motion Sickness and Human Performance Laboratory, Israel Naval Medical Institute, Israel Defense Forces Medical Corps, Haifa, Israel.
Aviation, Space, and Environmental Medicine
|February 6, 2010
Summary
Professional divers show faster sacculocollic reflex responses, indicated by reduced N23 wave latency. This adaptation likely compensates for altered sensory input in underwater environments, enhancing otolith organ function.
Area of Science:
- Vestibular neuroscience
- Human physiology
- Diving medicine
Background:
- Otolith organs, crucial for sensing linear motion, may be affected by the denser medium encountered in underwater diving.
- Changes in otolith function could impact divers' balance and spatial orientation.
Purpose of the Study:
- To investigate potential alterations in the sacculocollic reflex among professional divers.
- To determine if diving leads to adaptive changes in the saccular response.
Main Methods:
- Utilized vestibular evoked myogenic potential (VEMP) to assess saccular function in 12 professional divers and 12 matched non-divers.
- Recorded VEMP parameters, including wave latencies, amplitudes, asymmetry ratio, and response threshold, shortly after diving and after a 24-hour interval.
Main Results:
- Divers exhibited a statistically significant shortening of the N23 wave latency compared to the control group (22 ± 0.1 ms vs. 24.5 ± 0.5 ms).
- No significant differences in VEMP parameters were observed between early and late post-dive recordings in the divers group.
Conclusions:
- The reduced N23 latency suggests long-term adaptation of the sacculocollic reflex to underwater conditions.
- This adaptation may involve increased reflex sensitivity to counteract reduced linear velocity and acceleration, optimizing otolith organ stimulation.
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