Effect of frequency of horizontal linear oscillation on motion sickness and somatogravic illusion.

摘要: BACKGROUND Low frequency linear (translational) oscillation is an important stimulus in provoking motion sickness a variety of modes transport. HYPOTHESIS Lower frequencies horizontal would be more nauseogenic. The somatogravic illusion (SGI) affected by frequency. METHODS Subjects (n = 12) were exposed to sinusoidal (3.6 m.s-2 peak) at three different (0.205 Hz, 0.350 0.500 Hz) one week intervals, with order randomized between subjects. seated the upright position, through X head body axis. RESULTS mean (+/- S.D.) exposure time required produce moderate nausea decreased significantly (p < 0.01) towards lower frequency: 24.4 +/- 19.3 min. 12.0 9.5 7.8 6.2 0.205 Hz. fit (t) was -7.4 dB/octave. This equivalent -3.7 dB/octave decrease nauseogenic potential increasing frequency, if t1/2 used as standard "motion dose" models. SGI reported 5/12 subjects (mean illusory tilting angles 16.2 degrees forward, 14.3 back) but there no relationship and or sickness. CONCLUSIONS Horizontal than predicted mathematical models based on vertical oscillation, nauseogenicity for less steep that previously motion.