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

Research Project

Project/Area Number	59870020
Research Category	Grant-in-Aid for Developmental Scientific Research
Allocation Type	Single-year Grants
Research Field	Hygiene
Research Institution	Hokkaido University
Principal Investigator	SAITO Kazuo Hokkaido University School of Medicine, Professor, 医学部, 教授 (80000917)
Co-Investigator(Kenkyū-buntansha)	SAITO Takeshi Hokkaido University School of Medicine, Instructor, 医学部, 助手 (40153811) HOSOKAWA Toshiyuki Hokkaido University School of Medicine, Instructor, 医学部, 助手 (00157025)
Project Period (FY)	1984 – 1986
Project Status	Completed (Fiscal Year 1986)
Budget Amount *help	¥2,800,000 (Direct Cost: ¥2,800,000) Fiscal Year 1986: ¥300,000 (Direct Cost: ¥300,000) Fiscal Year 1985: ¥700,000 (Direct Cost: ¥700,000) Fiscal Year 1984: ¥1,800,000 (Direct Cost: ¥1,800,000)
Keywords	Fatigue / VRT / CFF / TAF / VDT work / 脳波
Research Abstract	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