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Updated: Apr 28, 2026

How to Study Placebo Responses in Motion Sickness with a Rotation Chair Paradigm in Healthy Participants
Published on: December 14, 2014
Space motion sickness countermeasures: a pharmacological double-blind, placebo-controlled study
Meclizine and dimenhydrinate with cinnarizine reduced the vestibulo-ocular reflex gain, potentially alleviating space motion sickness (SMS). Promethazine with d-amphetamine altered saccadic eye responses and ocular counterrolling, suggesting complex vestibular interactions.
Area of Science:
- Vestibular neuroscience
- Space medicine
- Pharmacology
Background:
- Space motion sickness (SMS) stems from a canal-otolith conflict.
- Current treatments like promethazine have inconsistent efficacy for SMS.
- This study explores if suppressing semicircular canals (SCCs) can alleviate SMS.
Purpose of the Study:
- To evaluate the effects of meclizine, dimenhydrinate/cinnarizine, and promethazine/d-amphetamine on SCCs and otoliths.
- To investigate potential new treatments for space motion sickness.
Main Methods:
- Double-blind, placebo-controlled study with 20 healthy men.
- Electronystagmography assessed SCC function.
- Unilateral centrifugation and cervical vestibular evoked myogenic potentials tested otolith and saccular function, respectively.
Main Results:
- Meclizine and dimenhydrinate/cinnarizine decreased vestibulo-ocular reflex gain.
- Promethazine/d-amphetamine reduced saccadic eye response latency.
- Promethazine/d-amphetamine increased ocular counterrolling during centrifugation.
Conclusions:
- Meclizine and dimenhydrinate/cinnarizine may affect the medial vestibular nucleus.
- D-amphetamine counteracts promethazine's vestibular suppression and fatigue effects.
- Further research is needed to confirm if SCC suppression alleviates SMS.
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