Effects of light intervention on alertness and mental performance during the post-lunch dip: a multi-measure study

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  • ASKARIPOOR Taleb
    Department of Occupational Health, School of Public Health, Hamadan University of Medical Sciences, Iran
  • MOTAMEDZADE Majid
    Department of Ergonomics, School of Public Health, Hamadan University of Medical Sciences, Iran
  • GOLMOHAMMADI Rostam
    Center of Excellence for Occupational Health, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Science, Iran
  • FARHADIAN Maryam
    Department of Biostatistics, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, Iran
  • BABAMIRI Mohammad
    Department of Ergonomics, School of Public Health, Hamadan University of Medical Sciences, Iran
  • SAMAVATI Mehdi
    Department of Medical Physics & Biomedical Engineering & Research Center for Biomedical Technologies and Robotics (RCBTR), Tehran University of Medical Sciences, Iran

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<p>Disrupting sleepiness and fatigue during the post-lunch dip by environmental factors may result in a decrease in human errors and accidents, and enhance job performance. Recent studies have shown that both red white light as well as blue white light can have a positive effect on human alertness and mental functioning. In the present study, the light intervention was evaluated for its effectiveness on alleviating the post-lunch dip. Twenty healthy volunteers experienced 117 min of four light conditions preceded by a 13-min initial dim light while performing a continuous performance test (CPT) and undergoing recording of the electroencephalogram (EEG): blue-enriched white light (12,000 K, 500 lx, BWL), red saturated white light (2,700 K, 500 lx, RWL), normal white light (4,000 K, 500 lx, NWL), and dim light (<5 lx, DL) conditions. Other outcome measures were subjective sleepiness, mood, and performance tests (working memory, divided attention, and inhibitory capacity). We found that exposure to both BWL and RWL conditions decreased the lower alpha-band power compared to the NWL and DL conditions. No significant differences were observed in subjective sleepiness and mental performance during sustained attention, working memory, and inhibitory capacity tasks between NWL, RWL, and BWL conditions. The present findings suggest that both RWL and BWL, compared to NWL condition, can improve the physiological correlates of alertness in EEG measurements. However, these changes did not translate to improvements in task performance and subjective alertness.</p>

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