Seasickness Susceptability and Vestibular Time Constant
NCT ID: NCT05640258
Last Updated: 2022-12-14
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
NA
67 participants
INTERVENTIONAL
2017-09-18
2020-07-26
Brief Summary
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A vestibular time constant was calculated based on velocity step testing on a rotatory chair at baseline, 3 months and 6 month following active sailing duty.
A seasickness questionnaire (WIKER) was completed during follow-up visits. study participants were divided to three groups based on WIKER score - susceptible , non-susceptible and habituating. Vestibular time constant was compared between study groups.
Detailed Description
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Conditions
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Study Design
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NA
SINGLE_GROUP
DIAGNOSTIC
NONE
Study Groups
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seasickness susceptibility and vestibular time constant
All study participants underwent rotatory chair testing in a velocity step protocol to determine the Vestibular time constant.
testing were preformed at baseline, before commencing active duty on a ship, 3 month and 6 month follow up after the beginning of active sailing.
rotatory chair testing in a velocity step protocol.
Tc was evaluated by the rotational velocity step test using the OtoaccessTM interface (Interacoustics Nydiag 200, Middlefart, Denmark). Subjects were seated on the rotatory chair wearing videonystagmography goggles with their heads supported and tilted 30° forward, thus bringing the horizontal semicircular canals plane perpendicular to the axis of rotation. Standard videonystagmography techniques were employed to record eye-movements. Subsequent to eye movements' calibration, the chair was accelerated about the yaw axis at 30°/sec2 to a maximal velocity of 90°/sec, followed by rotation at a constant velocity. After 57 seconds of constant velocity rotation, the chair was decelerated to zero velocity at 30°/sec2. The described velocity step was conducted both clockwise and counter-clockwise, giving a total run time of 4 minutes.
Interventions
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rotatory chair testing in a velocity step protocol.
Tc was evaluated by the rotational velocity step test using the OtoaccessTM interface (Interacoustics Nydiag 200, Middlefart, Denmark). Subjects were seated on the rotatory chair wearing videonystagmography goggles with their heads supported and tilted 30° forward, thus bringing the horizontal semicircular canals plane perpendicular to the axis of rotation. Standard videonystagmography techniques were employed to record eye-movements. Subsequent to eye movements' calibration, the chair was accelerated about the yaw axis at 30°/sec2 to a maximal velocity of 90°/sec, followed by rotation at a constant velocity. After 57 seconds of constant velocity rotation, the chair was decelerated to zero velocity at 30°/sec2. The described velocity step was conducted both clockwise and counter-clockwise, giving a total run time of 4 minutes.
Eligibility Criteria
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Inclusion Criteria
Exclusion Criteria
* Otoscopic findings of ear pathology
* An implanted electrode
* A finding of vestibulopathy upon otoneurological examination -
* Discontinuation of active sailing for any reason during study follow-up
* Withdrawal of informed consent.
18 Years
20 Years
MALE
Yes
Sponsors
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Medical Corps, Israel Defense Force
OTHER
Responsible Party
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Locations
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Israeli Naval Medical Institute
Haifa, , Israel
Countries
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References
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Lagami D, Gutkovich YE, Jamison A, Fonar Y, Tal D. Seasickness susceptibility and the vestibular time constant: a prospective study. Exp Brain Res. 2024 Jan;242(1):267-274. doi: 10.1007/s00221-023-06745-z. Epub 2023 Nov 28.
Other Identifiers
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IDF-1710-2016
Identifier Type: -
Identifier Source: org_study_id