Askaripoor Taleb, Motamedzadeh Majid, Golmohammadi Rostam, Farhadian Maryam, Babamiri Mohammad, Samavati Mehdi
Department of Occupational Health, School of Public Health, Hamadan University of Medical Sciences, IR.
Department of Ergonomics, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, IR.
J Circadian Rhythms. 2018 Sep 12;16:9. doi: 10.5334/jcr.167.
Fatigue and sleepiness are one of the main causes of human errors and accidents in the workplace. The empirical evidence has approved that, in addition to stimulating the visual system, light elicits brain responses, which affect physiological and neurobehavioral human functions, known as the non-image forming (NIF) effects of light. As recent evidences have shown the positive effects of red or low correlated color temperature white light on alertness and performance, we investigated whether exposure to 2564 K light could improve subjective and objective measures of alertness and performance compared with 7343 K, 3730 K, and dim light (DL) conditions during the daytime. Twenty two healthy participants were exposed to the light while they were performing a sustained attention task and their electroencephalogram (EEG) and electrocardiogram (ECG) were recorded. Both 2564 K and 7343 K conditions significantly reduced EEG alpha-power compared with the DL and 3730 K conditions. Moreover, the 2564 K, 7343 K, and 3730 K conditions significantly reduced subjective fatigue, sleepiness and increased heart rate and performance compared with the DL condition. Furthermore, the effects of light conditions on alertness and performance varied over the day so that more effective responses were observed during the afternoon hours. These findings suggest that light interventions can be applied to improve daytime performance.
疲劳和困倦是工作场所人为失误和事故的主要原因之一。经验证据表明，除了刺激视觉系统外，光线还会引发大脑反应，影响人类的生理和神经行为功能，这被称为光的非成像（NIF）效应。最近的证据显示红色或低相关色温白光对警觉性和工作表现有积极影响，因此我们研究了在白天，与7343K、3730K和暗光（DL）条件相比，暴露于2564K光线下是否能改善警觉性和工作表现的主观和客观指标。22名健康参与者在执行持续注意力任务时暴露于不同光线下，并记录他们的脑电图（EEG）和心电图（ECG）。与DL和3730K条件相比，2564K和7343K条件均显著降低了EEG的α波功率。此外，与DL条件相比，2564K、7343K和3730K条件均显著减轻了主观疲劳和困倦，并提高了心率和工作表现。此外，光照条件对警觉性和工作表现的影响在一天中有所不同，下午时段观察到的反应更有效。这些发现表明，光照干预可用于改善白天的工作表现。
