Guignard J C, McCauley M E
Aviat Space Environ Med. 1982 Jun;53(6):554-63.
Independent groups of up to 32 young men exposed in a standard seated posture to one of five conditions of vertical (Z axis) motion for up to 2 h. Exposure was less in the event of vomiting or a volunteer's voluntary withdrawal from the experiment. A control condition, sinusoidal motion of 0.17 Hz and 0.13 G R.M.S., provided the basis for comparison with the remaining four conditions, each produced by the sum of two sinusoids, the fundamental at 0.17 Hz plus the second or third harmonic. The conditions differed in the phase relationship of the fundamental and second harmonic, or in the relative acceleration levels of the two harmonic components. The predicted motion sickness incidence (MSI) for each sinusoid alone was calculated from a previously derived mathematical model and compared with the obtained MSIs. Certain motion conditions provoked unexpectedly high MSIs compared with the control condition. It was found that R.M.S. acceleration is not reliable as the sole predictor of MSI in complex motion. Further data must be obtained before accurate prediction of MSI in broadband motion will be possible.
多达32名年轻男性被分为不同组，以标准坐姿暴露于五种垂直（Z轴）运动条件之一长达2小时。若出现呕吐或志愿者自愿退出实验，则暴露时间缩短。一种对照条件，即0.17赫兹和0.13G均方根的正弦运动，为与其余四种条件进行比较提供了基础，其余四种条件均由两个正弦波之和产生，基波为0.17赫兹，加上二次谐波或三次谐波。这些条件在基波与二次谐波的相位关系或两个谐波分量的相对加速度水平上有所不同。根据先前推导的数学模型计算每个单独正弦波的预测晕动病发病率（MSI），并与获得的MSI进行比较。与对照条件相比，某些运动条件引发的MSI出人意料地高。研究发现，均方根加速度作为复杂运动中MSI的唯一预测指标并不可靠。在能够准确预测宽带运动中的MSI之前，必须获取更多数据。
