Exposure to blue light during lunch break: Effects on autonomic arousal and behavioral alertness

Emi Yuda, Hiroki Ogasawara, Yutaka Yoshida, Junichiro Hayano

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Background: Exposures to melanopsin-stimulating (melanopic) component-rich blue light enhance arousal level. We examined their effects in office workers. Main body of abstract: Eight healthy university office workers were exposed to blue and orange lights for 30 min during lunch break on different days. We compared the effects of light color on autonomic arousal level assessed by heart rate variability (HRV) and behavioral alertness by psychomotor vigilance tests (PVT). Heart rate was higher and high-frequency (HF, 0.150.45 Hz) power of HRV was lower during exposure to the blue light than to orange light. No significant difference with light color was observed, however, in any HRV indices during PVT or in PVT performance after light exposure. Short conclusion: Exposure to blue light during lunch break, compared with that to orange light, enhances autonomic arousal during exposure, but has no sustained effect on autonomic arousal or behavioral alertness after exposure.

Original languageEnglish
Article number30
JournalJournal of Physiological Anthropology
Issue number1
Publication statusPublished - 2017


  • Alertness
  • Arousal
  • Blue light
  • Heart rate variability
  • Melanopsin
  • Non-image forming vision
  • Orange light
  • Organic light-emitting diode
  • Psychomotor vigilance


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