VDT 作業における視覚条件と生理的負担

概要

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Cardiac interbeat interval sequences have been measured during VDT works under the three ambient illuminance levels of 100,320 and 1000lx. The light sources were fluorescent lamps with color temperature of 4200K. Three brightness contrasts of 3 : 1,8 : 1 and 20 : 1 were adopted on a CRT display surface at each of the abovementioned illuminance levels. Spectral analysis of the cardiac interval signals showed the presence of the vasomotor blood pressure component centered at about 0.1Hz. The mean heart rate and the power ratio of the vasomotor component to all fluctuating components of the cardiac signals were found to have significant relations with the ambient illuminance and the brightness contrast on a CRT display surface. The results obtained suggest that the visual condition of the ambient illuminance level of 320lx and the brightness contrast of 8 : 1 causes the minimum physiological load.
湘南工科大学の論文
1986-03-26