The static standing position of autism spectrum disorder (ASD) is unstable. However, the cause has not been clarified. We will investigate the fluctuation of center of pressure (COP) by detrended fluctuation analysis (DFA) and contribute to the elucidation of the cause in the future.
We investigated the characteristics of fluctuations in the COP in 16 individuals with ASD and 13 individuals with typical development (TD). All participants stood on a Wii Balance Board for 70 s during which time we obtained COP data at 100 Hz. The eyes-open and eyes-closed conditions were performed once each. We obtained the locus length, total locus length, outer peripheral area, and the mean value and standard deviation of the coordinate position, and also calculated the mean value, standard deviation, coefficient variability, and alpha index of velocity from the acquired data, which we used as evaluation indices.
The locus lengths in the mediolateral and anteroposterior directions and the total length, as well as the outer peripheral area of the COP, found no significant differences between the groups. The alpha index showing the strength of long-term correlations of the standing position by DFA of moving distance per 100 Hz in the ASD group was significantly larger than that in the TD group (p = .011) in the anteroposterior direction under the eyes-closed condition.
Postural sway in the ASD group did not differ from TD but was maintained from a long-term perspective.
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The data presented in this article is part of a larger study and thus not available as Supplementary Material at the present time.
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We thank all participants who contributed to this study.
This research was supported by Grants-in-Aid for Scientific Research (A) (17H00883) and on Innovative areas (24119004), Grant-in-Aid for Challenging Exploratory Research (20K20649), and Grant-in-Aid for JSPS Research Fellow (18J14536).
We conducted the present study with the approval of the Institutional Ethics Committee of our university hospital, and also in accordance with the Declaration of Helsinki, and the Ethical Guidelines for Medical and Health Research Involving Human Subjects by the Japanese Ministry of Health, Labour, and Welfare.
All participants read the explanatory material about this study. Then, participants cooperated with the questionnaire and the experiment only if they consented to the study.
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Tsugita, N., Ogawa, S., Maki, N. et al. Fluctuations of the Center of Pressure in Autism Spectrum Disorder. Adv Neurodev Disord (2023). https://doi.org/10.1007/s41252-023-00314-9