Rostam Golmohammadi, Mojtaba Kamalinia, Kamalodin Abedi, Sara Karimi, Mahbubeh Eshaghi,
Volume 2, Issue 1 (6-2014)
Abstract
Introduction: Many calls already perform by cell phones that have need to radiation exposure by users. Because of health reasons and some doubts about effects, this study was conducted to determine the extent of the mobile phones radiations and self report symptoms of users.
Material and Method: In this cross-sectional study, 80 available randomly users contain students and staffs of Hamadan University of medical sciences in 2012 were selected. Electro Smog meter TES-593 was used as radiation measurements tool. In order to assess health effects of mobile phones’ radiation, a self-administered survey questionnaire were used. Statistical analyses were performed using T-test, ANOVA and X2 tests by SPSS 11.5.
Results: Results showed that the conversation mode had a highest level of electromagnetic indices in the studied cell phones. Compare means of power density that emitted from studied mobile phones had significantly difference (P=0.001). Relationship between exposure to the mobile phones radiation by symptoms of head-ache, anxiety and sleep disturb were significant (P=0.02, P=0.03, and P=0.002 respectively).
Conclusion: Although, there is founding the relations between exposure to cell phones electromagnetic fields and some self-reported symptoms in line with same reports, These symptoms can not be absolutely attributed to the use of mobile phones. With these considerations it is recommended that for prevention of health risks from cell phones, safe type selection, control of call duration and frequency of use of these devices should be mentioned.
Saeed Ilbeigi, Mohsen Ebrahimi, Mohammad Esmaeil Afzalpour, Hadi Moazeni,
Volume 9, Issue 2 (10-2021)
Abstract
Background & Objectives: The aim of this study was to investigate the ergonomics of armpits and aviators outdoor (park) based on anthropometry parameters of male users.
Methods: Among male users of these outdoor park equipment, 120 people from Tehran and in the age range over 20 years (48.38±16.27) were selected as a sample. The research variables were the dimensions of the devices and the anthropometry of the male users. The plumb line, engineering meter, ruler, goniometer and static anthropometer kit (caliper) were used to measure the dimensions of the devices and the anthropometry of the users (according to Pheasant instructions). Then, according to the standards of ergonomics and bodybuilding, the science of motor biomechanics and the way of installation on the devices, the fit of the devices was evaluated. Descriptive statistics were used to describe the data and single-group t-test (parametric statistics) and binomial statistics (non-parametric statistics) were used to test the hypotheses.
Results: The results showed that there was a significant difference between most of the desired dimensions of the devices with the relevant and optimal dimensions of users (P value<0.05). Therefore, from the anthropometric point of view, these devices are not ergonomic for male users, and it is necessary to adopt a method for the standardization of these devices.
Conclusion: Most dimensions of underarms and outdoor aviators are not ergonomic from the anthropometric point of view of male users. This mismatch can lead to complications and physical injuries to users. Therefore, users should be careful when using these devices and avoid working with devices that do not fit their physical dimensions.
Zahra Sadat Sharifi, Rasoul Hemmatjo, Abolfazl Ghahramani,
Volume 13, Issue 3 (9-2025)
Abstract
Objectives: Nowadays, electronic devices such as computers, mobile phones, and tablets have played an important role in people's work and lives, and the main complaint of users of video terminals is eye symptoms caused by them. This study aimed to evaluate the intensity of lighting and brightness and its possible relationship with visual fatigue in users of video terminals at Tabriz University of Medical Sciences.
Methods: This cross-sectional study was conducted on 171 users of video terminals at Tabriz University of Medical Sciences. In this study, the local illuminance intensity at the work surface and the luminance intensity from the screen at the user's eye level were measured. A 15-question visual fatigue questionnaire was used to assess visual fatigue. The results were analyzed using paired t-tests and chi-square tests using SPSS software.
Results: In this study, the average local illumination intensity on the desk was 306.6 lux and the average luminance intensity was 73.9 candelas per square meter. Local illumination intensity was lower than the recommended level in 41.6 percent of cases. There was no statistically significant relationship between illumination intensity and users' vision during the study, and there was also no statistically significant relationship between users' luminance and vision. The results of this study showed that vision at the end of the work has a significant relationship with the individual's vision at the beginning of the work. The results of this study also showed that there is a significant relationship between visual fatigue and the type of work.
Conclusion: According to the findings of the study, it is recommended that, if possible, the time to start working with visual terminals should be when there is no feeling of visual fatigue. Also, since one of the factors affecting visual fatigue is the type of work, it is recommended that users manage their work in such a way that they are mostly inactive (reading the page).
