Stabilometry is useful to comprehensively investigate equilibrium function . To increase the diagnostic value of stabilometry, stabilometric procedures and analytical indices of recorded body sway have been established with regard to the total locus length and locus length per unit area . In particular, locus length per unit area is assumed to represent minute variations in postural control and is considered a scale for evaluation of spinal proprioceptive postural control . Body sway is generally measured in a standing position, such as in Romberg’s and Mann’s postures, and fewer studies on body sway in a seated position have been performed. However, motion sickness that occurs in cars, trains, and ships, visually induced motion sickness that occurs while watching visual contents, and 3-dimensional (3D) sickness, which occurs while watching 3D video or playing 3D games, frequently occurs in a seated position. In addition, many jobs are performed in a seated position, such as Video Display Terminal (VDT) operation, office work, and driving, and fatigue accumulates while maintaining a seated position for a prolonged period. Moreover, an upright posture is difficult to maintain for some handicapped and elderly persons. However, there are few methods to objectively evaluate body sway in a seated position.
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