Motion Sickness Incidence as a Function of the Frequency and Acceleration of Vertical Sinusoidal Motion
Technical rept. 1 Jul 1972-30 Jun 1973
CANYON RESEARCH GROUP INC GOLETA CA HUMAN FACTORS RESEARCH DIV
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Fourteen experimental conditions of vertical sinusoidal motion were defined by combinations of wave frequency and acceleration level in a partial factorial design. The frequency range investigated was from 5 cycles per minute CPM, or .083 Hz to 30 CPM .500 Hz, and the average acceleration over each half-wave cycle ranged from about .03 to .40 g. Independent groups of 20 or more male Ss were exposed for 2 hours or until they began to vomit, whichever came first. Motion sickness incidence MSI, defined as the percentage of Ss experiencing vomiting, was greatest at a frequency of 10 CPM .167 Hz. For all wave frequencies, MSI increased as a monotonic function of the acceleration level. A mathematical model was derived from the data, and the implications for underlying physiological mechanisms and for transportation vehicle design were discussed.
- Stress Physiology
- Human Factors Engineering and Man Machine Systems