NCT05640258

Seasickness Susceptability and Vestibular Time Constant

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 67 (actual)
• Sponsor: Medical Corps, Israel Defense Force · Academic / Other
• Sex: Male
• Age: 18 Years – 20 Years
• Healthy volunteers: Accepted

Summary

Participants were selected from the military navy crewmembers prior to commencing of active sailing. 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.

Conditions

• Seasickness

Interventions

Type	Name	Description
DIAGNOSTIC_TEST	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.

Timeline

• Start date: 2017-09-18
• Primary completion: 2020-01-26
• Completion: 2020-07-26
• First posted: 2022-12-07
• Last updated: 2022-12-14

Locations

1 site across 1 country: Israel