変化騒音のTAF並びに体位変換による脳超音波減衰に及ぼす影響 (集中維持機能に関する研究-12,13-)

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The present experimental studies were made to clarify the relationship between the changes of CUSA due to postural change and the lowering in TAF under exposure to variable noise as a stress stimulus. The variable noise used was composed of band noise and white noise smaller than 90 phon which randomly varied in cycle, decibel and duration.Nine healthy male students were exposed to the unpleasant variable noise for two hours, and the TAF-test and the measurement of change of CUSA due to postural change were made both before and after the exposure.The results obtained were as follows:1) Exposure to variable noise caused a significant lowering in TAF-L in each examinee, as reported in our privious papers.2) The changes of CUSA due to postural change after the exposure to variable noise increased significantly in comparison with the values before the exposure.3) A significant correlation was observed between the lowering in TAF-L and the increase in the change of CUSA due to postural change, that is, the greater the lowering of TAF-L, the greater the incrcase of the change of CUSA.These facts suggested that the mechanism of cerebral circulation in postural change may be put under the control of the autonomic nervous system in a stress state due to noise exposure, that is corresponding with the lowering of TAF.
日本衛生学会の論文