Golding J F, Markey H M
DRA Centre for Human Sciences, Farnborough, Hants, U.K.
Aviat Space Environ Med. 1996 Feb;67(2):121-6.
Low frequency linear (translational) oscillation is an important stimulus in provoking motion sickness in a variety of modes of transport.
Lower frequencies of horizontal linear oscillation would be more nauseogenic. The somatogravic illusion (SGI) would be affected by frequency.
Subjects (n = 12) were exposed to horizontal sinusoidal motion (3.6 m.s-2 peak) at three different frequencies (0.205 Hz, 0.350 Hz, 0.500 Hz) at one week intervals, with order randomized between subjects. Subjects were seated in the upright position, with motion through the X head body axis.
The mean (+/- S.D.) motion exposure time required to produce moderate nausea decreased significantly (p < 0.01) towards the lower frequency: 24.4 +/- 19.3 min. at 0.500 Hz, 12.0 +/- 9.5 min. at 0.350 Hz, 7.8 +/- 6.2 min. at 0.205 Hz. The linear fit of time (t) to nausea with frequency was -7.4 dB/octave. This was equivalent to a -3.7 dB/octave decrease of nauseogenic potential with increasing frequency, if t1/2 were to be used as in the standard "motion dose" models. The SGI was reported by 5/12 subjects (mean illusory tilting angles 16.2 degrees forward, 14.3 degrees back) but there was no relationship between SGI and motion frequency or motion sickness.
Horizontal motion with subjects seated upright was more nauseogenic than would be predicted by mathematical models based on vertical oscillation, and the relationship of frequency to nauseogenicity for horizontal motion was significantly less steep than that previously reported for vertical motion.
低频线性（平移）振荡是在多种运输方式中引发晕动病的重要刺激因素。
较低频率的水平线性振荡会更易引发恶心。躯体重力错觉（SGI）会受频率影响。
12名受试者，以一周的间隔，暴露于三种不同频率（0.205赫兹、0.350赫兹、0.500赫兹）的水平正弦运动（峰值3.6米·秒-2）中，受试者之间的顺序随机。受试者坐姿直立，运动通过X头身轴。
产生中度恶心所需的平均（±标准差）运动暴露时间随着频率降低而显著减少（p<0.01）：0.500赫兹时为24.4±19.3分钟，0.350赫兹时为12.0±9.5分钟，0.205赫兹时为7.8±6.2分钟。时间（t）与恶心程度随频率的线性拟合为-7.4分贝/倍频程。如果像标准“运动剂量”模型那样使用t1/2，这相当于随着频率增加，致恶心潜能降低-3.7分贝/倍频程。12名受试者中有5名报告了躯体重力错觉（平均错觉倾斜角度向前16.2度，向后14.3度），但躯体重力错觉与运动频率或晕动病之间没有关系。
受试者坐姿直立时的水平运动比基于垂直振荡的数学模型预测的更易引发恶心，并且水平运动频率与致恶心性之间的关系比先前报道的垂直运动的关系明显更平缓。
