title: Relationship between Spectral Characteristics of Spontaneous Postural Sway and Motion Sickness Susceptibility.
abstract: Motion sickness (MS) usually occurs for a narrow band of frequencies of the imposed oscillation. It happens that this frequency band is close to that which are spontaneously produced by postural sway during natural stance. This study examined the relationship between reported susceptibility to motion sickness and postural control. The hypothesis is that the level of MS can be inferred from the shape of the Power Spectral Density (PSD) profile of spontaneous sway, as measured by the displacement of the center of mass during stationary, upright stance. In Experiment 1, postural fluctuations while standing quietly were related to MS history for inertial motion. In Experiment 2, postural stability measures registered before the onset of a visual roll movement were related to MS symptoms following the visual stimulation. Study of spectral characteristics in postural control showed differences in the distribution of energy along the power spectrum of the antero-posterior sway signal. Participants with MS history provoked by exposure to inertial motion showed a stronger contribution of the high frequency components of the sway signal. When MS was visually triggered, sick participants showed more postural sway in the low frequency range. The results suggest that subject-specific PSD details may be a predictor of the MS level. Furthermore, the analysis of the sway frequency spectrum provided insight into the intersubject differences in the use of postural control subsystems. The relationship observed between MS susceptibility and spontaneous posture is discussed in terms of postural sensory weighting and in relation to the nature of the provocative stimulus.
authors.affiliation: CNRS, LPNC, F-38000 Grenoble, France.|Univ. Grenoble Alpes, LPNC, F-38000 Grenoble, France.|INSERM/CNRS, CRNL, F-69675 Bron, France.
authors.forename: Rafael
authors.initials: R
authors.lastname: Laboissière
authors.affiliation: Service Explorations Audio-Vestibulaires, HCL, F-69003 Lyon, France.
authors.forename: Jean-Charles
authors.initials: JC
authors.lastname: Letievant
authors.affiliation: Service Explorations Audio-Vestibulaires, HCL, F-69003 Lyon, France.
authors.forename: Eugen
authors.initials: E
authors.lastname: Ionescu
authors.affiliation: CNRS, TIMC-IMAG, F-38000 Grenoble, France.
authors.forename: Pierre-Alain
authors.initials: PA
authors.lastname: Barraud
authors.affiliation: INSERM/CNRS, CRNL, F-69675 Bron, France.|Service Explorations Audio-Vestibulaires, HCL, F-69003 Lyon, France.
authors.forename: Michel
authors.initials: M
authors.lastname: Mazzuca
authors.affiliation: CNRS, LPNC, F-38000 Grenoble, France.|Univ. Grenoble Alpes, LPNC, F-38000 Grenoble, France.|Institut de Recherche Biomédicale des Armées, F-91223 Brétigny-sur-Orge, France.
authors.forename: Corinne
authors.initials: C
authors.lastname: Cian
mesh_terms: D000328:Adult; D003463:Cues; D004198:Disease Susceptibility; D005260:Female; D006801:Humans; D008297:Male; D009038:Motion; D009039:Motion Perception / Q000502:physiology*; D009041:Motion Sickness / Q000503:physiopathology*; D010775:Photic Stimulation; D004856:Postural Balance / Q000502:physiology*; D011434:Proprioception / Q000502:physiology*; D011795:Surveys and Questionnaires; D055815:Young Adult