VRT as a new apparatus for fatigue measurement and its application.

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In this project the authors designed a computer-controlled apparatus to evaluate fatigue. The design of this apparatus was based on the TAF test, which was originated 20 years ago. Measuring VRT, a subject was instructed to follow a dot target with a cross-shaped marker controlled by a paddle, and to superimpose the marker on the target. The computer calculated the distance between the marker and the target every 0.2 sec, and recorded the data per minute. This process was repeated three times. The average of the data obtained from this measurement was called "VRT-M," and the S.D. of the data, "VRT-D."Firstly, training effects, daily changes, weekly changes and similarities of the VRT-values were analyzed. A significant training effect of the VRT-D was recognized through analysis with the ANOVA and the percentage of learning. However, analysis of the training effect curve revealed that the training effects of VRT disappeared after five practice sessions. The VRT-M and VRT-D values on Mo … More nday were higher than those on other days. Nevertheless, significant daily changes and weekly changes in the VRT-M and VRT-D values were not recognized. No similarity between the VRT value and the near-point distance was recognized. Significant similarities between the VRT value and the CFF value or TAF value were recognized.Secondary, two applications of the VRT were examined. In the first experiment, a task with paper and a VDT task were undertaken by subjects for two hours. Although VRT values during the work did not show any significant difference between the two tasks, after the work there was a significant difference in the VRT values of the VDT task and the paper task. In the second experiment, the combined effects of lightning and noise on VDT work were investigated. There were no significant differences under any conditions. There were significant correlations of the VRT value to answers to the questionnaire, to refraction, to pupillary diameter and to the TAF value. Significant correlations of VRT-M to CFF value and to the percent alpha value of the EEG were recognized. Less