Joseph Judith A, Griffin Michael J
Human Factors Research Unit, Institute of Sound and Vibration Research, University of Southampton, Southampton, UK.
Aviat Space Environ Med. 2008 Nov;79(11):1019-27. doi: 10.3357/asem.2208.2008.
In tilting trains, low-frequency lateral and roll oscillation combine and can cause motion sickness. During a journey, passengers are exposed to motions of varying magnitudes, but the effect of a change in magnitude on motion sickness is not known. It was hypothesized that the rate of increase in motion sickness would be greater during exposure to a high-magnitude motion than during exposure to a low-magnitude motion and that there would be no difference in sickness between motions when the 'motion sickness dose value' was the same.
At intervals of at least 1 wk, 20 subjects were exposed to 4 conditions consisting of 0.1-Hz sinusoidal lateral oscillation with 50% roll compensation. Each condition had four successive 15-min periods of motion presented without a break (total duration 1 h). Each 15-min motion was either a high-magnitude motion (H) (+/- 1.26 ms(-2) lateral oscillation with +/- 3.66 degrees roll oscillation) or a low-magnitude motion (L) (+/- 0.63 ms(-2) lateral oscillation with +/-1.83 degrees roll oscillation). The four conditions involved four different combinations of magnitude: 1) LLLL, 2) HHHH, 3) LHHL, and 4) HLHL. Subjects were seated in a rigid closed cabin and gave ratings of sickness at 1-min intervals.
Symptoms of motion sickness were experienced in 56 of the 80 sessions. The rate of increase in motion sickness was greater with the high-magnitude motion than with the low-magnitude motion. For the two variable conditions (i.e., LHHL and HLHL), there was no significant difference in accumulated illness ratings when the motion sickness dose values were the same (i.e., between 30 and 60 min of motion). Illness ratings decreased during periods of low-magnitude motion experienced after periods of high-magnitude motion and also after the cessation of all motion.
With combined lateral and roll oscillation, the rate of increase in motion sickness is greater during periods of high-magnitude motion than during periods of low-magnitude motion. With motions having the same motion sickness dose value but different sequences of exposure, there were no significant differences in accumulated illness ratings at times when the motion sickness dose values were the same.
在摆式列车中，低频横向和侧倾振荡相结合会导致晕动病。在旅程中，乘客会受到不同强度的运动影响，但运动强度变化对晕动病的影响尚不清楚。研究假设，与低强度运动相比，高强度运动期间晕动病的增加速率会更高，并且当“晕动病剂量值”相同时，不同运动之间的晕动病程度没有差异。
至少每隔1周，20名受试者暴露于4种条件下，这些条件包括0.1赫兹的正弦横向振荡以及50%的侧倾补偿。每种条件下有连续四个15分钟的运动时段，不间断呈现（总时长1小时）。每个15分钟的运动要么是高强度运动（H）（±1.26米/秒²的横向振荡以及±3.66度的侧倾振荡），要么是低强度运动（L）（±0.63米/秒²的横向振荡以及±1.83度的侧倾振荡）。这四种条件涉及四种不同的强度组合：1）LLLL，2）HHHH，3）LHHL，4）HLHL。受试者坐在一个刚性封闭舱内，并每隔1分钟对晕动病程度进行评分。
在80个时段中有56个时段出现了晕动病症状。高强度运动时晕动病的增加速率高于低强度运动。对于两个可变条件（即LHHL和HLHL），当晕动病剂量值相同时（即在运动30至60分钟之间），累积晕动病评分没有显著差异。在高强度运动时段之后以及所有运动停止之后经历的低强度运动时段，晕动病评分会降低。
对于横向和侧倾振荡相结合的情况，高强度运动期间晕动病的增加速率高于低强度运动期间。对于具有相同晕动病剂量值但暴露顺序不同的运动，在晕动病剂量值相同时，累积晕动病评分没有显著差异。
