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Showing 10 results for Golmohammadi

Farshid Ali Arabian, Majid Motamedzade, Rostam Golmohammadi, Abbas Moghim Beigi, Fereshteh Pir Hayati,
Volume 1, Issue 1 (Journal of Ergonomics 2013)
Abstract

Introduction: One of the major problems in hospitals leading to high prevalence of musculoskeletal disorders among the health staff is associated with patients handling. This study was aimed to reduce musculoskeletal disorders using ergonomic intervention among Nahavand Alimoradian hospital staff.

Material and Methods: This study was conducted in four wards of 160-bed Nahavand Alimoradian hospital. The data collecting tool was Nordic Musculoskeletal Questionnaire. SPSS software was used for data analysis. The questionnaire was completed, before and after educational intervention, for 46 employees of the four wards which had the most complaints about musculoskeletal disorders. Training classes were held for the target group covering prevention of work-related musculoskeletal disorders, proper techniques for patient handling and stretching exercises for low back pain prevention.

Results: The main results tended to be the high prevalence of musculoskeletal disorders especially in low back, shoulders and wrists of the employees. Low back pain was the most prevalent disorder among the personnel. The educational intervention had not significant effect on lessening the musculoskeletal disorders in hospital staff (p > 0.05).

Conclusion: At present, regarding enhancements in healthcare procedures, there is an urgent need to ergonomic intervention in the design of environment, tools and equipment concurrent with educational intervention. Normal 0 false false false EN-US X-NONE FA
Zohreh Karami, Rostam Golmohammadi, Ahmad Heydari Pahlavian, Rashid Heydari Moghaddam, Jalal Poorolajal,
Volume 1, Issue 2 (Journal of Ergonomics 2013)
Abstract

This before-after clinical trial investigated the effect of daylight on morning and night melatonin, subjective general health using GHQ questionnaire, sleepiness and alertness on elderly who lived in nursing houses. Nineteen nursing home residents participated voluntarily. They exposed to daylight from 9 to 10 A.M. and from 4 to 5 P.M. for 6 weeks. General health of all participants was evaluated using general health questionnaire (GHQ) as well. Also we used of KSS and VAS questionnaire foe assessment of sleepiness and alertness. Baseline morning and night melatonin levels were 25.39 (±19.75)pg/ml, and 40.3 (±21.55)pg/ml respectively. Daylight exposure significantly affected morning melatonin at 7:00 A.M. but had no significant effect on night melatonin at 8:00 P.M. Mean score of general health changed 36.31 to 29.89 (P=0.003). Karolinska sleepiness scale (KSS) and Visual Analogue Scale (VAS) showed increase sleepiness and decrease alertness from 3:00 to 7:00 A.M. Sleepiness decreased and alertness increased during 1:00 P.M and 20:00 P.M. Overall day light exposure may delay sleep phase and circadian rhythm problems in elderly people. Anxiety and insomnia could be improved with daylight exposure. Our findings suggest that elders should be exposed to scheduled daylight in morning and evening for prevention and improvement of mental disorders. Adequate light should be provided for elder’s homes and nursing house. We have proposed to further study with a larger sample size be done to assess effect of daylight on GHQ' subscales.
Rostam Golmohammadi, Mojtaba Kamalinia, Kamalodin Abedi, Sara Karimi, Mahbubeh Eshaghi,
Volume 2, Issue 1 (Journal of Ergonomics 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.
Rostam Golmohammadi, Mohammad Hajiakbari, Rashid Heydari Moghadam, Razie Zare, Seyede Khadije Hoseini, Samane Karami,
Volume 2, Issue 4 (Journal of Ergonomics 2015)
Abstract

Introduction: In an educational environment, the quality of vision is integral to educational progress. Creating visual comfort and increasing efficiency and the desire to study are among the benefits of adjusting the lighting in classrooms and preventing visual impairment in the students. The present study was conducted to evaluate the degree of internal lighting in girls' schools across Hamadan in 2006 and 2014 so as to help identify their potential problems.

Materials and Methods: The present study was conducted in girls' schools across Hamadan on two different occasions –in 2006 and 2014. On each occasion, the average general and local lighting on the classroom blackboards were measured by the recommended methods of the Illuminating Engineering Society of North America on non-sunny days using a Lux Meter and were then compared to the standard limits recommended in the Health and Safety Code of schools and by the Illuminating Engineering Society of North America. In addition to the degree of lighting, certain quality assessment criteria were assessed, including the lighting layout, lamp maintenance, contrast, internal surface cleaning, lighting system maintenance, type of lamps and technical suitability of the design.

Results: Taking the criteria for favorable lighting conditions into account, less than 25% of the sites examined had favorable lighting on both occasions in 2006, only 16% of the classes had favorable general lighting and in 2014, the degree of lighting fell to an unacceptable range in all classes and only 6% of the entire classroom were covered by a standard degree of local lighting on the blackboard. The results also show that surface reflection coefficients are within the desirable range.

Conclusion: The lack of favorable general and local lighting on the blackboard at schools in 2014 and its comparison with the results of the 2006 lighting assessment indicate that providing standard lighting is still a problem for schools. Improper lighting layouts and the use of incandescents or inappropriate light bulbs are among the major causes of poor lighting conditions in girls' school across Hamadan. 

     
Mahtab Azizi, Mohsen Aliabadi, Rostam Golmohammadi ,
Volume 3, Issue 2 (Journal of Ergonomics 2015)
Abstract

Introduction: In recent years, compact fluorescent lamps have been more widely used across the country as a means of optimizing energy consumption. Given the health consequences of lighting sources, the present study was conducted to investigate the intensity of electromagnetic fields emitted by common compact fluorescent lamps.

Materials and Methods: The study examined 54 compact fluorescent lamp bulbs manufactured in local and international factories. The intensity of the electromagnetic fields emitted was measured at a very low frequency (VLF) and an extremely low frequency (ELF) using field measuring devices (Holaday HI 3603 and HI 3604 models). The data obtained were analyzed in SPSS.

Findings: The intensity of the emitted electric and magnetic fields decreased with the increase in their distance from the sources. At the reference point of 25 cm, the effective intensity of the electric field was 2.25 v/m at the very low frequency and 15.39 v/m at the extremely low frequency. The intensity of the magnetic fields was 0.47 mA/m at the very low frequency and 9.41 mA/m at the extremely low frequency. All the values were below the national exposure limits. There was a significant difference between the effective intensity of the electric and magnetic fields based on the lamps' manufacturers (p<0.05).

Conclusion: Although the intensities of the electromagnetic fields of the lamps were lower than the exposure limits, due to lack of conclusive evidence on the biological effects of fields, minimizing the public exposure to fields is essential. The use of standard-quality lamps is therefore highly recommended as a preventive measure.


Azam Biabani, Mohsen Aliabadi, Rostam Golmohammadi,
Volume 4, Issue 2 (Journal of Ergonomics 2016)
Abstract

Introduction: Nominal noise reduction rate of the earmuff manufacturers can be different compared with the actual attenuation rate. The present study aimed to determine the actual noise reduction rate of common hearing protection devices using microphone in real ear method.

Materials and Methods: In this study, five brands of common earmuffs used in Iranian industries were investigated on 30 subjects under laboratory conditions. Noise reduction rates of earmuffs were measured based on the ISO 11904 standard, microphone in real ear method, using noise dosimeter (SVANTEK, SV 102 model) equipped with a microphone SV 25 model. The earmuffs comfort was also assessed by the developed questionnaire.

Results: The results showed that the real noise reduction rates of the earmuffs were between 49% to 86% of nominal reduction rates. Moreover, the actual insertion losses were much negligible at low noise frequencies. The performances of earmuffs based on manufacturers were not statistically different (Pv> 0.05). Based on subjects’ comfort scores, comfort of ear muffs were within the acceptable range. The noise reduction rates of the different earmuffs of each model were not statistically different as well (Pv > 0.05).

Conclusions: Irregular use of earmuff can reduce the real attenuation of earmuff to lower than the minimum rate acquired in this study. Proper training and adequate supervision on proper use of earmuff can affect earmuff fitting along with increasing of real noise attenuation.


Rostam Golmohammadi, Mohsen Mehdinia, Reza Shahida, Ebrahim Darvishi,
Volume 5, Issue 2 (Journal of Ergonomics 2017)
Abstract

Introduction: Lighting affects many non-visual functions such as Circadian rhythm, alertness, core body temperature, hormone secretion and sleep. The aim of this study was to investigate the effects of lighting on human cognitive and mental performance.
Methods: In this systematic review, databases including ISI Web of Knowledge, Scopus, PubMed and Science Direct were searched to access the relevant studies. The search was performed using the keywords "Lighting" and "Illumination" and "Cognitive Performance", "Mental Performance", "Memory ", "Attention", and "Concentration" by title, keyword and abstracts of articles published in mentioned databases from 2010 to 2016.
Results: Lighting affects human cognitive performance in three areas of psycho-cognitive (visual comfort, visual perception, color recognition, identification of symbols, attention, working memory, learning, reaction time and brain function), biocognitive area (alertness, mood, vitality, subjective feelings, motivation, well-being and quality of sleep) and mental workload (amount of workload, psychological stress, and mental fatigue). The best light to regulate cognitive, biological (circadian rhythm) and mental processes is bright daylight in the morning with a short wavelength (wavelength 420-480 nm) and high intensity (1000lx).
Conclusions: Lighting design in addition to providing comfort and visual needs should provide the non-visual and cognitive needs such as attention, alertness, mood, sleep quality and decrease mental fatigue and eventually well-bing.


Zahra Pirmoradi, Rostam Golmohammadi, Javad Faradmal, Majid Motamedzade,
Volume 5, Issue 4 (Journal of Ergonomics 2018)
Abstract

Background: Inadequate lighting in the workplace can cause unconventional changes in the posture of office workers. Poor ergonomic conditions in the office cause inappropriate postures during work and increase pressure on the musculoskeletal system which can cause some disorders in long-term. In this study, the relationship between work environment lighting with the prevalence and severity of musculoskeletal pain among office workers has been investigated.
 
Methods: In this study, the intensity of local illumination at work surface and at the perpendicular surface (perpendicular surface to the work surface and at the height of workers eye), and intensity of general lighting was measured based on the standard of The Illuminating Engineering Society (IES) using the SEKONIC, C-7000 SpectroMaster. Also, to assess the prevalence and severity of pain of musculoskeletal disorders, a Nordic Questionnaire and a Body map index were used respectively. To assess the office work strain, Rapid Office Strain Assessment techniques (ROSA) were used. Data were analyzed by SPSS 21.
Results: The results showed that the average intensity of general lighting, local lighting at work surface and at the perpendicular surface were 30.6%, 33.9%, and 38.4% respectively, which is lower than required illumination intensity of Occupational Exposure Limits (OEL). The neck and waist had the highest prevalence of the musculoskeletal disorders among the workers. The highest frequency percentage of scores in the ROSA method was the score 5 (41.7%) which had a significant correlation with illumination intensity.
Conclusion: Illumination intensity can be considered as one of the important factors affecting posture in administrative staff. Therefore, the improvement of illumination intensity can decrease the severity of musculoskeletal pain and improve the body postures of the staff and, consequently, increase their comfort.

Azar Soltani, Mohsen Aliabadi, Rostam Golmohammadi, Majid Motamedzade,
Volume 6, Issue 1 (Journal of Ergonomics 2018)
Abstract

Background: Exposure to hand-arm vibration is one of the most common physical harmful factors. The purpose of this study was Experimental study of  the level of manual performance disability caused by exposure to hand-arm vibration among automobile casting workers.
 Methods: This study was performed on 53 casting workers as case group and 28 controls as
control group. The measurement of the vibration of the worker's arms and hands was carried out in accordance with the ISO 5349 standard. The level of manual performance disability was evaluated using skeletal-muscular, sensory-neural and vascular tests. Also, a questionnaire was used for the level of disability of the arm, shoulder and hand DASH. Data were analyzed using SPSS16 software.
 Results: The 8-hour vibration exposure was 8.33 m / s2 (4.49), which is exceeded the permissible level. Skill and dexterity, fingers and grip strength of the dominant hand in the case group were decreased by 4%, 13.3%
and 11%, respectively (p <0.05). The regeneration time of the dominant hand in the case group was 41.2% higher than the control group (p <0.05). Sensory-neurological complications increased in the case group compared to the control group, however, it was not statistically significant. The DASH score in the case group was 10.7 (13.4) and the control group was 4.1 (5.1).
 Conclusion: Hand-arm manual performance disability in workers exposed to vibration decreased from 4% to 14%, which confirmed the DASH score. In addition, workers showed a higher level of vascular complications compared with sensory-neurological complications.

 

Reza Shahidi, Rostam Golmohammadi, Zahra Pirmoradi Rizevandi, Azar Soltani, Nassrin Shirmohammadi Khoram, Reza Kazemi,
Volume 8, Issue 1 (Iranian Journal of Ergonomics 2020)
Abstract

Background and Aim: Undesirable lighting at work environment causes visual and non-visual effects on employers. The aim of this study was to compare the quantity and quality of combined and artificial lighting in daytime and its relationship with the indexes of mental performance.
Methods: This study was carried out at 65 rooms and on 81 employees randomly selected from different clusters. Measurement of lighting parameters was done using a spectrometer. To assess the cognitive function, the Pshycomotor Vigiliance Task (PVT) test and for the sake of visual comfort, alertness and sleep quality, the Conlone, KSS (Karolinska Sleepiness Scale) and PSQI (Pittsburgh Sleep Quality Index) questionnaires were used respectively.
Results: Most artificial sources used in the rooms included fluorescent lights in different shapes and colors. The average indexes of combined lighting was more than artificial lightings (P<0.001). Visual comfort was correlated with high color temperature (P=0.006, r = 0.315). The employees with natural lighting had less visually impairment. The sleep quality of the subjects was related to the type of work environment lighting (Chi2=0.59, P=0.44). Alertness of subjects exposed to high color temperature or natural light was better at 8 and 11 hours. The results of cognitive performance test showed no significant difference between different lighting conditions.
Conclusion: Using natural light or artificial lights with adequate illuminance and high correlated color temperature can increase the alertness and visual comfort to some extent and improve the sleep quality of day staff employers.



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