Abstract
BackgroundMotion sensitivity after vestibular disorders is associated with symptoms of nausea, dizziness, and imbalance in busy environments. Dizziness and imbalance are reported in places such as supermarkets and shopping malls which have unstable visual backgrounds; however, the mechanism of motion sensitivity is poorly understood.ObjectiveThe main aim of this exploratory observational study is to investigate visual fixations and postural sway in response to increasingly complex visual environments in healthy adults and adults with motion sensitivity.MethodsA total of 20 healthy adults and 20 adults with motion sensitivity will be recruited for this study. Visual fixations, postural sway, and body kinematics will be measured with a mobile eye tracker device, force plate, and 3D motion capture system, respectively. Participants will be exposed to experimental tasks requiring visual fixation on letters, projected on a range of backgrounds on a large screen during quiet stance. Descriptive statistics (mean and standard deviation) will be calculated for each of the variables. One-way independent-measures analyses of variance will be performed to investigate the differences between groups for all variables.ResultsData collection was started in May 2019 and was completed by February 2020. It was approved by Health and Disability Ethics Committees, Ministry of Health, New Zealand on November 2, 2018 (Ethics ref: 18/CEN/193). We are currently processing the data and will begin data analysis in July 2020. We expect the results to be available for publication by the end of 2020. The trial was funded by the Neurology Special Interest Group, Physiotherapy New Zealand, and the Eisdell Moore Centre in November 2018.ConclusionsThis study will provide a detailed investigation of visual fixations in response to increasingly complex visual environments. Investigating characteristics of visual fixations in healthy adults and those with motion sensitivity will provide insight into this disabling condition and may inform the development of new intervention strategies which explicitly cater to the needs of this population.Trial RegistrationAustralian New Zealand Clinical Trials Registry, ACTRN12619000254190; https://tinyurl.com/yxbn7nksInternational Registered Report Identifier (IRRID)PRR1-10.2196/16805
Highlights
Motion sensitivity is characterized by nausea, dizziness, and imbalance in response to motion of the visual environment [1]
The study will determine whether complex visual environments are associated with fixational instability, altered Center of pressure (COP) displacement, and altered center of mass (COM) displacements of the head and body in adults with motion sensitivity compared with healthy adults
JMIR Res Protoc 2020 | vol 9 | iss. 7 | e16805 | p. 7 sensitivity and whether it leads to increased postural sway and altered kinematics in adults with motion sensitivity
Summary
Motion sensitivity is characterized by nausea, dizziness, and imbalance in response to motion of the visual environment [1]. It can develop as a sequela of a vestibular disorder and is one of the diagnostic criteria for persistent postural perceptual dizziness [1,2,3]. Objective: The main aim of this exploratory observational study is to investigate visual fixations and postural sway in response to increasingly complex visual environments in healthy adults and adults with motion sensitivity. Results: Data collection was started in May 2019 and was completed by February 2020 It was approved by Health and Disability Ethics Committees, Ministry of Health, New Zealand on November 2, 2018 (Ethics ref: 18/CEN/193). Trial Registration: Australian New Zealand Clinical Trials Registry, ACTRN12619000254190; https://tinyurl.com/yxbn7nks International Registered Report Identifier (IRRID): PRR1-10.2196/16805
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