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Trunk postural change calculated with the data of the motion analysis system was defined by the total change of inter-segmental angles (θx,y(i)), which was formed with three consecutive retro-reflective markers on a the sagittal and b coronal planes and the sensing system was defined by the change of inclination differences between angles αi and βi , respectively, formed by the tangent and vertical line on c sagittal and d coronal planes
