ＶＤＴ作業における作業負担に関する実験的研究　第２編　　入力方式の相違による影響

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タイトル別名
  • An experimental study of work load on VDT performance. Part 2. Effects of difference in input devices.
  • VDT サギョウ ニ オケル サギョウ フタン ニ カンスル ジッケンテキ ケ
  • Part 2. Effects of Difference in Input Devices
  • 第2編 入力方式の相違による影響

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Effects of the difference in input device on work load of VDT task were studied.<br>The subjects of the experiment were eight healthy male college students (age: 21-22 yr) having a binocular vision of not less than 0.7 and no astigmatism or hyperopia.<br>The test consisted of an experimental word processing task in which the subjects visually searched e's in given sequences of alphabetical letters displayed on the CRT and converted them to 5's through input device operation.<br>As for experimental conditions, two kinds of input devices, namely, keyboard and lightpen were adopted and 1 h was provided as each operation time.<br>Critical flicker fusion (CFF), near point distance, accommodation time, subjective fatigue symptoms, blinking counts, pupillary reflex, electromyogram in upper limb, neck and shoulder and performance score were measured.<br>The results were as follows.<br>1) Decrease in C. F. F. was observed in two experimental conditions during the process of operating time.<br>2) Increments in complaints of subjective fatigue related to visual function were seen in the two experimental conditions after 1 h VDT task.<br>3) A higher error rate in performance was observed in the subjects using the lightpen compared to the one using the keyboard.<br>4) The frequency of both blinking and pupil-size changes were lower in the subjects using the lightpen compared to those using the keyboard. This suggests that the gaze time of the VDT screen with lightpen-condition is longer than that in keyboard-condition.<br>5) Complaints of subjective fatigue to shoulders, back, arm and low back, and also larger amplitude of electromyogram in upper limb, neck and shoulder were observed in the subjects using the lightpen compared to those using the keyboard. This suggests that the muscular load of the upper limbs and the restriction of posture in the lightpen-condition are larger than those of the keyboard-condition.

収録刊行物

  • 産業医学

    産業医学 28 (6), 462-469, 1986

    社団法人 日本産業衛生学会

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