Effect of Variation in Swing Radius and Arc on Incidence of Swing Sickness

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Abstract
In these expts. 250 human subjects were swung on a 2-pole swing through angles of 50, 90 and 130[degree], using radii of 6, 10 or 16 ft., to determine the importance of frequency and of quantity of G change in the occurrence of swing sickness. The incidence of swing sickness was increased from 4 to 58% when the frequency was decreased from 22/min. on the 6-ft. swing to 15/min. on the 16-ft. swing. The incidence of swing sickness was reduced from 50 to 22% by reducing the oscillation angle from 90 to 50[degree] (or G change from 0.9 to 0.25). Increasing the angle from 90 to 130[degree] did not increase incidence of sickness. The frequency and quantity of G change on the 16-ft., 90[degree] swing are similar to those of an elevator used in other work in which sickness was almost absent. This suggests that the tangential component of force on the swing is a significant factor. It would appear that a threshold combination of at least 2 forms of motion is necessary for the production of motion sickness.

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