Abstract
There have been many reports of the effects of whole-body vibration on phy-siological function of human body, but there have been no experimental studies on the effect on sleep. Subjects were exposed to very low level of vibration (vertical direction) and the effects on sleep were studied. The subjects were 4 healthy male students and a vibration exposure was done to the subject sleeping on a vibration table once per 30 min for 30 sec. Vibration levels measured on bedclothes were 60, 65, 69, 74, 79 dBVL. Effects of vibration on sleep were investigated by comparing sleep stages before and after the vibration exposure.If the maximum permissible level of vibration on sleep is determined on the basis of the result of this experiment, 65 dBVL will be considered to be appropriate as vibration level not affecting to sleep in the Stage 2 so remarkably. If the maximum permissible level of vibration which does not affect to sleep is necessary to be determined, 60 dBVL will be appropriate.
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