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Showing 3 results for Lighting
Z Zamanian, K Nikeghbal, H Ebrahimi, S Purshahidi ,
Volume 2, Issue 1 (1-2013)
Abstract
Background: It has been prover that the prevalence of experiencing job related stress is very high among the dentists. This stress can be the result of factors such as poor lightening of dental office and noise. This stress can cause emotional distress and threaten dentists’ physical health and affect the quality of their life. This study is conducted to determine dentists’ professional quality of life and job-related stress and two important workplace factors that can affect them which are lighting and noise.
Materials and Methods: In this cross-sectional study the researchers visited the dental offices in Shiraz city and measured lighting and noise of the places, also dentist's quality of life and job stress were determined using McGill quality of life questionnaire and job-stress questionnaire.
Results: The relationship between quantitative variables was determined by using regression test and the multiple regression test was used for the modeling process. The average of local noise caused by dental drills and other parameters was 75.5 and 74.5 in public and private offices. In 2.2% of dental offices lightening condition was below the standard levels. Results show that 58.9% of dentists participating in this study experience good or fairly good quality of life.
Conclusion: The results suggest that workplace environmental situation and dentists’ professional stress and quality of life are correlated. So adjusting effective workplace parameters to the standard levels can lead to increase in the dentists’ quality of life.
A Esmaeili , M Rezaeian , Hr Naghizadeh , Sh Khajehosseini , M Mobini ,
Volume 6, Issue 2 (4-2017)
Abstract
Background: Lighting is a basic need for human beings and affects their physical, physiological, and psychological behavior. The required level of lighting for visual performance must be provided in order to ensure health and wellbeing. Students spend much of their time studying in libraries, and thus, sufficient lighting is necessary in libraries. Therefore, the aim of the present study was to determine lighting intensity in university libraries in Rafsanjan, Iran.
Materials and Methods: The present cross-sectional study was conducted on 13 university libraries of Rafsanjan in April 2014. To assess natural and total lighting intensity, the network method was used. Lighting intensity was measured in a total of 314 stations in the university libraries of Rafsanjan. The collected data were analyzed using descriptive statistics.
Results: The men’s section of the library of Vali-E-Asr University of Rafsanjan had the highest total lighting intensity (1265.40 ± 530.95 lx) and the men's section of the library of the School of Medicine, Rafsanjan University of Medical Sciences, had the lowest total lighting intensity (91.06 ± 29.40 lx). Among the 13 study halls of the studied libraries, 4 (30.7%) halls had no windows. The lack of windows has an undesirable effect on the intensity of natural lighting.
Conclusions: Based on the results of this study, the average lighting intensity in 50% of the studied libraries was less than the Iranian standard. Therefore, the redesigning and modification of the lighting systems of these libraries are necessary.
Parvaneh Yekzamani, Iraj Alimohamadi, Jamileh Abolghasemi, Batol Masruri, Azadeh Ashtarinezhad,
Volume 12, Issue 2 (4-2023)
Abstract
Background: Light can be considered as one of the factors affecting performance, visual comfort, proficiency, and energy efficiency in the workplace. This study aimed to investigate the oxidative stress-induced light intensity in male rats.
Materials and Method: In this experimental study, a total of 32 male rats were randomly divided into four groups of eight (control group: exposure to 150 lux, group 2, 3, and 4 exposure to 300, 5000, and 8000 lux, respectively). Blood samples were collected from each rat before, 7, and 14 days after exposure. Malondialdehyde (MDA) and Total Antioxidant Capacity (TAC) levels were measured as oxidative stress indices. Data were analyzed using SPSS software.
Results: The results showed that the intensity of 8000 lux increased the MDA level and decreased the TAC level 7 and 14 days after exposure. The TAC level decreased in the group exposed to 5000 lux light intensity during 7 and 14 days (0.31±0.065 mmol/L and 0.36±0.077 mmol/L, respectively). The 5000 and 8000 lux light intensities decreased the TAC and caused oxidative stress in male rats after 7 and 14 days, and only the group exposed to 300 lux light intensity can restore TAC to normal levels since the 7th day.
Conclusion: The results of this study showed that light intensity is a significant factor in the development of oxidative stress. It seems that higher light intensities along with 14 days have more effects on the oxidative stress.
