PHYSIOLOGICAL EFFECTS OF BLUE LIGHT AND RED LIGHT AT NIGHT: MEASUREMENT　DEPENDENCE AND CORRELATION OF SUBJECTIVE IMPRESSION

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  • OCHIAI Shotaro
    Graduate School of Integrated Frontier Sciences, Kyushu　University
  • HARADA Kazuki
    Graduate School of Integrated Frontier Sciences, Kyushu　University
  • LEE Sang-il
    Department of Human Science, Faculty of Design, Kyushu　University
  • HIGUCHI Shigekazu
    Department of Human Science, Faculty of Design, Kyushu　University

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Other Title
  • 夜の青色光と赤色光の生理作用：測定項目間の違いと印象評価との関連性
  • ヨル ノ セイショクコウ ト セキショクコウ ノ セイリ サヨウ : ソクテイ コウモク カン ノ チガイ ト インショウ ヒョウカ ト ノ カンレンセイ

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Abstract

The aim of the present study was to determine the measurement dependence of the effects of color light and to clarify the correlation between physiological responses and subjective impression. Seventeen male university students without color vision deficiency were exposed to blue light and red light (200 lx at eye level) at night for three hours. The effects of blue light on pupil constriction and melatonin suppression were significantly greater than the effects of red light. On the other hand, heart rate tended to be higher under the red light condition. There was no significant difference between the effects of blue light and red light on rectal temperature or alertness. Individual variations in the subjective impression of light were correlated with heart rate and rectal temperature but not with melatonin concentration or pupil constriction. The results suggest that the physiological effects of light depend on measurements and that these variations may be influenced by subjective impression.

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