4.2. Subjective postural vertical with eyes-opened and subjective postural vertical
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The directional errors of SPV-EO showed no significant main effects of time nor group (wedge condition) in the control and experimental groups. However, the interaction of time and group showed a significant difference between the control and experimental conditions. Nevertheless, our results were obtained in healthy individuals, in whom stability was not significantly higher on the left side than on the right side (only minimal clinically important differences). SPV directional errors were within the normal range (0.12° ± 0.95° in the roll plane and −2.5° ± 2.5° in the roll plane).In the present study, the directional errors of SPV showed no significant differences in terms of simple main effects after training in the experimental condition. The variability of errors of SPV was significantly different in terms of time and group interactions. Therefore, somatosensory wedge adaptation was symmetrical in the vertical axis. However, adaptation did not occur only on the left side in our healthy participants, as values were within the minimal clinically important differences.