抄録
The heart rates, based on the R-R intervals, and pneumogramms of 18 subjects have been measured for 35 min. at illumination levels from 10 to 2, 000 lx. Light sources used were the fluorescent lamps with the color temperature of 4200 K. The wall in the test room was yellow-green close to 7.5 GY 8/2, and the room temperature was kept at 24 ± 1 ° C. The amount of physiological load was assessed from the mean heart rate, heart rate variability, and mean amplitude and period of pneumogramm.
At the same time, psychological effects were investigated by use of a simple questionnaire.
The results indicated that physiological load was minimum at the illumination level of 320 lx, and increased with increase or decrease in illumination level from 320 lx. Therefore the level of 320 lx appears to be the physiologically optimum level of illumination.
Psychologically, however, the level of 1, 000 lx was estimated to be the most desirable level of illumination, and desirability decreased as the illumination level was icreased or decreased from 1, 000 lx.
