Volume 11, Issue 4 (12-2021)
J Health Saf Work 2021, 11(4): 674-699 |
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Askaripoor T, Motamedzade M, Golmohammadi R, Babamiri M, Farhadian M, Aghaei H, et al . The parallel effect of correlated color temperature and illumination level on alertness and cognitive performance: a multi-measure study. J Health Saf Work 2021; 11 (4) :674-699
URL: http://jhsw.tums.ac.ir/article-1-6581-en.html
URL: http://jhsw.tums.ac.ir/article-1-6581-en.html
Taleb Askaripoor1 
, Majid Motamedzade * 2, Rostam Golmohammadi3 , Mohammad Babamiri4 , Maryam Farhadian5 , Hamed Aghaei6 , Mohammad Ebrahim Ghaffari7 , Elahe Kazemi8 , Mehdi Samavati9
, Majid Motamedzade * 2, Rostam Golmohammadi3 , Mohammad Babamiri4 , Maryam Farhadian5 , Hamed Aghaei6 , Mohammad Ebrahim Ghaffari7 , Elahe Kazemi8 , Mehdi Samavati9
1- PhD., Dep. of Occupational Health and Safety Engineering, Faculty of Health, Semnan University of Medical Sciences, Semnan, Iran
2- Professor, Department of Ergonomics, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran ,motamedzade@yahoo.com
3- Professor, Center of Excellence for Occupational Health, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Science, Hamadan, Iran
4- PhD., Department of Ergonomics, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran
5- PhD., Department of Biostatistics, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran
6- PhD., Department of Occupational Health Engineering, School of Health, Arak University of Medical Sciences, Arak, Iran
7- PhD., Dental Sciences Research Center, Faculty of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
8- M.Sc., Dep. of Occupational Health and Safety Engineering, Faculty of Health, Semnan University of Medical Sciences, Semnan, Iran
9- PhD., Department of Medical Physics & Biomedical Engineering & Research Center for Biomedical Technologies and Robotics (RCBTR), Tehran University of Medical Sciences, Tehran, Iran
2- Professor, Department of Ergonomics, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran ,
3- Professor, Center of Excellence for Occupational Health, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Science, Hamadan, Iran
4- PhD., Department of Ergonomics, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran
5- PhD., Department of Biostatistics, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran
6- PhD., Department of Occupational Health Engineering, School of Health, Arak University of Medical Sciences, Arak, Iran
7- PhD., Dental Sciences Research Center, Faculty of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
8- M.Sc., Dep. of Occupational Health and Safety Engineering, Faculty of Health, Semnan University of Medical Sciences, Semnan, Iran
9- PhD., Department of Medical Physics & Biomedical Engineering & Research Center for Biomedical Technologies and Robotics (RCBTR), Tehran University of Medical Sciences, Tehran, Iran
Abstract: (1638 Views)
Introduction: Recent evidence indicates that lighting can affect physiological and neurobehavioral human functions, referred to as non-image forming (NIF) effects of lighteffects. This study aimed to determine the effects of illumination levels and correlated color temperature (CCT) on alertness and performance under NIF conditions.
Material and Methods: In this study, 22 participants were exposed to light at various levels of illumination, including very low illuminance (<5 lux, control) and light conditions with correlated color temperatures (CCT) of 4000 K, 8000 K, and 12000 K at 300 and 500 lux. The data collection process included recording the power of brainwaves (alpha, alpha-theta, beta, and theta), sleepiness and mood scales, and cognitive performance tests for sustained attention, psychomotor vigilance task (PVT), working memory, and inhibitory capacity.
Results: The results indicated that 500 lux light conditions at correlated color temperatures of 8000 and 12000K significantly reduced normalized alpha, alpha-theta power, subjective sleepiness, and performance compared to the dim light condition. Under illumination levels of 300 and 500 lux, there were no significant differences in the measured values of the variables.
Conclusion: Lighting interventions can be used as a supplement to other strategies for increasing alertness and performance in the workplace.
Material and Methods: In this study, 22 participants were exposed to light at various levels of illumination, including very low illuminance (<5 lux, control) and light conditions with correlated color temperatures (CCT) of 4000 K, 8000 K, and 12000 K at 300 and 500 lux. The data collection process included recording the power of brainwaves (alpha, alpha-theta, beta, and theta), sleepiness and mood scales, and cognitive performance tests for sustained attention, psychomotor vigilance task (PVT), working memory, and inhibitory capacity.
Results: The results indicated that 500 lux light conditions at correlated color temperatures of 8000 and 12000K significantly reduced normalized alpha, alpha-theta power, subjective sleepiness, and performance compared to the dim light condition. Under illumination levels of 300 and 500 lux, there were no significant differences in the measured values of the variables.
Conclusion: Lighting interventions can be used as a supplement to other strategies for increasing alertness and performance in the workplace.
Keywords: Sleepiness, Alertness, Light, Correlated color temperatures, Cognitive performance, Electroencephalography
Type of Study: Research |
Received: 2021/12/24 | Accepted: 2021/12/31 | Published: 2021/12/31
Received: 2021/12/24 | Accepted: 2021/12/31 | Published: 2021/12/31
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