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Background  Motion sensitivity, or motion sickness, is common in modern vehicular and visually stimulating environments. Several studies have shown a relationship between motion sensitivity and decreased postural stability. We aimed to evaluate the effects of head motion (horizontal and vertical) on postural stability in healthy adults with and without chronic motion sensitivity (CMS).    Methods  Sixty healthy adult men and women (age, 20–40 years) with CMS (CMS group,  n  = 30) and without CMS (non-CMS group,  n  = 30) participated in the study. Postural stability was assessed during three conditions (static, horizontal head motion, and vertical head motion) using computerized dynamic posturography. Group and condition-related differences in equilibrium scores were evaluated.    Results  There was no significant group x condition interaction (F 2,114  = 0.9, partial ƞ 2  = 0.04,  p  = 0.35). However, significant condition-related differences in equilibrium scores were observed (F 2,114  = 26.4, partial ƞ 2  = 0.31,  p  < 0.001). Equilibrium scores were significantly worse in the horizontal and vertical head motion conditions compared to those in the static condition ( p  < 0.001), but were comparable in vertical and horizontal head motion conditions ( p  = 0.27).    Conclusions  Postural stability was lower in the horizontal and vertical conditions compared to the static condition. However, horizontal and vertical head motions had comparable effects on postural stability in both CMS and non-CMS groups, contrary to our expectations.

Effects of head motion on postural stability in healthy young adults with chronic motion sensitivity