Studies for the Evaluation of Human-Body Exposure to Whole-Body Vibration at Very Low Frequencies

There was the International Standard for a resident on the reaction of horizontal vibration from a traffic system and building and structure of ocean and so on. These effects were not evaluated yet by physiological method for the present. It showed, however, that the criterion curve evaluated a psychological method on the basis of the comfortable and uncomfortable feelings and did not establish by using the physiological data up to now. In this study, it tested the low frequency vibration to find the mutual effects by the physiological and psychological measuring method for fore-and-aft below 0.1Hz. The study has adopted a physiological measuring method of reflex of the autonomic nervous system and has adopted a psychological measuring method of evaluation of the introspective five and seven grades according to the twenty items. The result of this study has been used for the establishment of health guidance caution on the various transportation systems and structures, including occupational health. Furthermore these new data have made it possible to exhibit the applicability to the standard for the evaluation of a lower range.