Department of Occupational Health, School of Public Health, Hamadan University of Medical Sciences, Iran.
Department of Ergonomics, School of Public Health, Hamadan University of Medical Sciences, Iran.
Ind Health. 2019 Aug 3;57(4):511-524. doi: 10.2486/indhealth.2018-0030. Epub 2018 Oct 27.
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.
通过环境因素干扰午饭后困倦和疲劳，可能会减少人为错误和事故，并提高工作绩效。最近的研究表明，红蓝白光都对人体警觉性和精神功能有积极影响。在本研究中，评估了光干预对缓解午饭后困倦的效果。20 名健康志愿者在进行连续性能测试（CPT）和记录脑电图（EEG）的同时，经历了四种光条件的 117 分钟：富含蓝光的白光（12,000K，500lx，BWL）、饱和红光的白光（2,700K，500lx，RWL）、正常白光（4,000K，500lx，NWL）和暗光（<5lx，DL）条件。其他结果测量包括主观困倦、情绪和性能测试（工作记忆、分散注意力和抑制能力）。我们发现，与 NWL 和 DL 条件相比，暴露在 BWL 和 RWL 条件下，下 alpha 波段的功率降低。在持续注意力、工作记忆和抑制能力任务中，NWL、RWL 和 BWL 条件之间的主观困倦和精神表现没有显著差异。本研究结果表明，与 NWL 条件相比，RWL 和 BWL 都可以改善 EEG 测量中警觉性的生理相关性。然而，这些变化并没有转化为任务表现和主观警觉性的提高。
