Abstract
A few studies have evaluated swaying motion of the body in the seated posture; however, these studies did not evaluate motion sickness caused by watching movies, traveling, etc. This study aimed to analyze stabilograms recorded while the individuals were seated. Stabilometry was performed on 7 healthy male subjects (age, 21–22 years) in the seated position 5 min before, and at 5-min intervals from 5 to 60 min after alcohol load. Alcohol caused a decrease in the cerebellar equilibrium function that controls the vestibulospinal reflex. We adjusted the degree of simulative effect on the human equilibrium function. The stabilograms of the test subjects were analyzed according to the area of sway, total locus length, and total locus length per unit area. We found that significant alcohol-induced changes in the sway values in the seated posture were similar to those in the upright posture.
Highlights
Stabilometry is useful to comprehensively investigate equilibrium function [1]
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
The distance between the minimal points of the time-averaged potential estimated from the stabilogram measured in the seated position tended to increase when alcohol was ingested compared to that without ingestion, and this may have been due to alcohol ingestion-induced changes in the coefficient of the timeaveraged potential of a mathematical model describing the body sway
Summary
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 [2]. 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. 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. 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. There are few methods to objectively evaluate body sway in a seated position
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