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2007, Piran, Slovenia

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Environmental Ergonomics XII<br />

Igor B. Mekjavic, Stelios N. Kounalakis & Nigel A.S. Taylor (Eds.), © BIOMED, Ljubljana <strong>2007</strong><br />

the same way as described above. The feelings of sleepiness was also measured by using<br />

VAS.<br />

Paired t-tests were used to compare the differences between red-light and blue-light<br />

conditions. The effects of illumination and color temperature were analyzed by two-way<br />

repeated measures ANOVA. The level of statistical significance was set at 0.05.<br />

RESULTS<br />

The mean (±S.D.) of the 90-s time intervals for the red-light condition was 109.3 ±30.6 s; that<br />

for the blue-light condition was 114.0 ±21.6 s. The difference between the two light<br />

conditions was not significant. On the other hand, all subjects produced shorter 180-s time<br />

intervals in the red-light condition than in the blue-light condition. The mean (±S.D.) of the<br />

180-s time interval for the red-light condition was 163.2 ±50.4 s, and that for the blue-light<br />

condition was 199.0 ±54.4 s. This difference was found to be significant (p

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