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Volume 12, Issue 4 (Iranian Journal of Ergonomics 2025)
Iran J Ergon 2025, 12(4): 252-262 |
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Research code: 163032719
Ethics code: IR.IAU.ILAM.RES.1403.091
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Fatahi K. Investigating the Effect of Carbon Dioxide in the Air on the Feeling of Thermal Comfort, Cognitive Function, and Heart Rate of Healthcare Workers while Working. Iran J Ergon 2025; 12 (4) :252-262
URL: http://journal.iehfs.ir/article-1-1055-en.html
URL: http://journal.iehfs.ir/article-1-1055-en.html
Department of Architecture, II.c., Islamic Azad University, Ilam, Iran , karenfatahi@yahoo.com
Abstract: (3064 Views)
Objectives: The primary aim of this study is to examine the impact of carbon dioxide (CO2) concentrations in the air on thermal comfort, cognitive performance, and heart rate among healthcare workers while they engage in their duties within therapeutic environments. These settings are often characterized by high occupancy, inadequate ventilation, underground locations, limited natural light, and exposure to pollutants.
Methods: In this laboratory-based research, 20 employees from a specialized clinic were randomly assigned into two groups of ten. They were exposed to varying levels of CO2 at a controlled temperature of 25°C: one group experienced 1100 ppm with adequate ventilation, while the other was subjected to 1800 ppm without ventilation. Key parameters, such as heart rate, thermal comfort (assessed using the ASHRAE standard questionnaire), and cognitive performance (measured through the MOCA test) were recorded. The collected data were analyzed using multivariate analysis of covariance (MANCOVA).
Results: The statistical analysis revealed significant effects of cognitive performance and CO2 levels (1800 ppm vs. 1100 ppm) on thermal comfort (F(1,15)=13.257, P<0.05 and F(1,15)=16.694, P<0.05). Furthermore, both the CO2 levels and the gender of participants significantly influenced the heart rate of healthcare workers in their work environments (F(1,15)=53.381, P<0.05 and F(1,15)=9.642, P<0.05). Specifically, individuals exposed to 1800 ppm of carbon dioxide reported a thermal dissatisfaction score that was 0.878 units higher and exhibited a heart rate that was 9.25 beats per minute greater compared to those exposed to 1100 ppm.
Conclusion: The findings underscore the importance of continuous air quality monitoring in workplace settings. Such measures can enhance thermal comfort levels, improve cognitive performance, and mitigate health risks for healthcare workers engaged in their professional activities.
Methods: In this laboratory-based research, 20 employees from a specialized clinic were randomly assigned into two groups of ten. They were exposed to varying levels of CO2 at a controlled temperature of 25°C: one group experienced 1100 ppm with adequate ventilation, while the other was subjected to 1800 ppm without ventilation. Key parameters, such as heart rate, thermal comfort (assessed using the ASHRAE standard questionnaire), and cognitive performance (measured through the MOCA test) were recorded. The collected data were analyzed using multivariate analysis of covariance (MANCOVA).
Results: The statistical analysis revealed significant effects of cognitive performance and CO2 levels (1800 ppm vs. 1100 ppm) on thermal comfort (F(1,15)=13.257, P<0.05 and F(1,15)=16.694, P<0.05). Furthermore, both the CO2 levels and the gender of participants significantly influenced the heart rate of healthcare workers in their work environments (F(1,15)=53.381, P<0.05 and F(1,15)=9.642, P<0.05). Specifically, individuals exposed to 1800 ppm of carbon dioxide reported a thermal dissatisfaction score that was 0.878 units higher and exhibited a heart rate that was 9.25 beats per minute greater compared to those exposed to 1100 ppm.
Conclusion: The findings underscore the importance of continuous air quality monitoring in workplace settings. Such measures can enhance thermal comfort levels, improve cognitive performance, and mitigate health risks for healthcare workers engaged in their professional activities.
Type of Study: Research |
Subject:
Other Cases
Received: 2024/11/28 | Accepted: 2025/02/28 | ePublished: 2025/02/28
Received: 2024/11/28 | Accepted: 2025/02/28 | ePublished: 2025/02/28
References
1. Tabe Afshar S, Toofan S, Saghafi Asl A. An Investigation of Sick Building Syndrome (SBS) in Workplaces, (Case Study: Engineering Organization Building of Urmia). Iran J Ergon 2022;10(2):90-100.
2. Thach TQ, Mahirah D, Dunleavy G, Nazeha N,Zhang Y, Tan CEH, et al. Prevalence of sick building syndrome and its association with perceived indoor environmental quality in an Asian multi-ethnic working population. Build Environ. 2019; 166:106420. [DOI:10.1016/j.buildenv.2019.106420]
3. Sadrizadeh S, Yao R, Yuan F, Awbi HB. Indoor air quality and health in schools: A critical review for developing the roadmap for the future school environment. J Build Engineer. 2022;57: 104908. [DOI:10.1016/j.jobe.2022.104908]
4. Ma N, Aviv D, Guo H, W. Braham W. Measuring the right factors: A review of variables and models for thermal comfort and indoor air quality. Renewable and Sustainable Energy Reviews. 2021;135: 110436. [DOI:10.1016/j.rser.2020.110436]
5. Karimi A, Bayat A, Mohammadzadeh N, Mohajerani M, Yeganeh M. Microclimatic analysis of outdoor thermal comfort of high-rise buildings with different configurations in Tehran: Insights from field surveys and thermal comfort indices. Build Environ. 2023;240:110445. [DOI:10.1016/j.buildenv.2023.110445]
6. Van JH, Mazej M, Hensen JLM. Thermal comfort: Research and practice. Front Biosci. 2010;15(2):765-788. [DOI:10.2741/3645]
7. Su X , Yuan Y , Wang Z , Liu W , Lan Li , Lian Z. Human thermal comfort in non-uniform thermal environments: A review. Energy Built Environ. 2024;5(6):853-862. [DOI:10.1016/j.enbenv.2023.06.012]
8. Mindeel TA, Spentzou E, Eftekhari M. Energy, thermal comfort, and indoor air quality: Multi-objective optimization review. Renewable and Sustainable Energy Reviews. 2024;202:114682. [DOI:10.1016/j.rser.2024.114682]
9. Yao R, Zhang S, Du C, Schweiker M, Hodder S, et al. Evolution and performance analysis of adaptive thermal comfort models- a comprehensive literature review. Build Environ. 2022;217:109020. [DOI:10.1016/j.buildenv.2022.109020]
10. Wu Y, Zhao J, Cao B. A systematic review of research on personal thermal comfort using infrared technology-Energy and Buildings. Energy Build. 2023;301:113666. [DOI:10.1016/j.enbuild.2023.113666]
11. Xiong J, Lian Z , Zhou X, You J, Lin Y. Effects of temperature steps on human health and thermal comfort. Build Environ. 2015;94(1):144-154. [DOI:10.1016/j.buildenv.2015.07.032]
12. Chen Y, Wang Z, Tian X, Liu W. Evaluation of cognitive performance in high temperature with heart rate: A pilot study. Build Environ. 2023;228:109801. [DOI:10.1016/j.buildenv.2022.109801]
13. Fisher GG, Chacon M, Chaffee DS. Theories of cognitive aging and work. In: Baltes B, Rudolph C, Zacher H, editors. Work across the lifespan. Cambridge, Massachusetts: Academic Press; 2019; 17-45. [DOI:10.1016/B978-0-12-812756-8.00002-5]
14. Fatahi K, Beigi M. Assessing the state of cognitive performance of employees and determining the range of thermal comfort of different genders in Ilam hospitals. TKJ. 2024;16(3):27-41.
15. Ahmadi H, Noorllahi M, Soleimani MR, Bitaraf E. Investigating the Effect of Environmental Thermal Comfort Components on Students' Cognitive Performance based on the Analysis of Fatigue Factor (Study Sample of Architecture Students of Universities in Ilam). Iran J Ergon 2023;10 (4):250-258.
16. LiangY, Yu J, Xu R, Zhang J, Zhou X, Luo M. Correlating working performance with thermal comfort, emotion, and fatigue evaluations through on-site study in office buildings. Build Environ. 2024;265:111960. [DOI:10.1016/j.buildenv.2024.111960]
17. Barmanesh F, Fatahi K, Nooroullahi M, Malekshahi A. Impact of Air Flow and Humidity on the Erosion of Walli Castle in Ilam: A CFD Approach. Journal of Iranian Architecture Studies.2024;13(25),79-95.
18. Meyer SC, Hünefeld L. Challenging Cognitive Demands at Work, Related Working Conditions, and Employee Well-Being. Int J Environ Res Public Health. 2018;15(12):2911. [DOI:10.3390/ijerph15122911]
19. Tao D, Tan H, Wang H, Zhang X, Qu X, Zhang T. A Systematic Review of Physiological Measures of Mental Workload. International Journal of Environmental Research and Public Health. 2019; 16(15):2716. [DOI:10.3390/ijerph16152716]
20. Erdmann CA, Steiner KC, Apte MG. Indoor carbon dioxide concentrations and sick building syndrome symptoms in the base study revisited: Analyses of the 100 building dataset. Proceedings: Indoor Air. 2002.
21. Ansari Manesh M, Nasrollahi N. Determining the appropriate range of carbon dioxide to optimize the quality of the indoor environment in office buildings in Kermanshah city. Naqshejahan. 2018; 8(1): 9-15.
22. Farhadi F, Khakzand M, Barzegar Z, Khanmohammadi MA. Investigating parameters affecting indoor air quality in healthcare spaces. Sadra Medi Sci J. 2024;12(2):151-160.
23. Zhou Q, Lyu Z, Qian H, Song J, Möbs VC. Field-measurement of CO2 level in general hospital wards in Nanjing. Procedia Engineer. 2015; 121:52-58. [DOI:10.1016/j.proeng.2015.08.1018]
24. Apte MG, Fisk WJ, Daisey JM. Associations between indoor CO2 concentrations and sick building syndrome symptoms in U.S. office buildings: an analysis of the 1994-1996 BASE study data. Indoor Air. 2000;10(4): 246-257. [DOI:10.1034/j.1600-0668.2000.010004246.x]
25. Allen JG, MacNaughton P, Laurent JGC, Flanigan SS, et al. Green Buildings and Health. Curr Envir Health Rpt. 2015; 2(3):250-258. [DOI:10.1007/s40572-015-0063-y]
26. Gauthier S, Liu B, M.Huebner G, Shipworth D. Investigating the effect of CO2 concentration on reported thermal comfort. Scartezzini, Jean-louis (ed.) In Proceedings of CISBAT 2015 International Conference on Future Buildings and Districts - Sustainability from Nano to Urban Scale - Vol. I. Info Science. 2015; 315-320.
27. Vickers K, Jafarpour S, Mofidi A, Rafat B, Woznica A. The 35% carbon dioxide test in stress and panic research: Overview of effects and integration of findings. Clin Psychol Rev. 2012;32(3):153-164. [DOI:10.1016/j.cpr.2011.12.004]
28. Fatahi K, Shadieh S. Experimental Study of the Effect of Ambient and Water Temperature During Showering on the Feeling of Thermal Comfort of Elderly Men.3 JNE 2025;13(6):1-15. [DOI:10.61186/jria.13.1.5]
29. Zare M, Dehghan H, Yazdanirad S, Khoshakhlagh AH. Comparison of the Impact of an Optimized Ice Cooling Vest and a Paraffin Cooling Vest on Physiological and Perceptual Strain. Saf Health Work. 2019;10(2):219-223. [DOI:10.1016/j.shaw.2019.01.004]
30. Crosby S, Rysanek A. Predicting thermal satisfaction as a function of indoor CO2 levels: Bayesian modelling of new field data. Build Environ. 2022;209:108569. [DOI:10.1016/j.buildenv.2021.108569]
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