4.1. Sitting pressure
The sitting pressure at the time of the SPV judgment showed that postural change was based on visual, somatosensory, and gravity perception. Sitting pressure during the SPV judgment was notably different between the control and experimental conditions and between the left- and right-side tilts. The wedge balance training with maximum lateral truncal tilt changed the directional errors on the left side, and variability errors in SPV judgment occurred. The balance training significantly affected the weight-bearing sitting pressure distribution during the SPV judgment. The relationship between WBA in postural balance and sitting pressure, caused by sensory adaptation in body tilt, and balance strategies have been previously reported.