Showing 9 results for Hoseini
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.
Saideh Meshgin, Rahman Sheikhhoseini, Ramin Balouchi,
Volume 6, Issue 2 (Journal of Ergonomics 2018)
Abstract
Introduction: People with different ages especially children and teenagers spend most of their free time using electronic entertainments The purpose of this research was studying the relationship between “upper body posture” and physical activity, mental aspects and the use of electronic entertainments.
Materials & Methods: In this cross-sectional study, 160 female students aged 7-12 years old, from 17th district of Tehran were chosen. Tools for collecting information was short-form physical activity measure questionnaire (IPAQ), personal information questionnaire consisting of questions about the amount of time using electronic entertainments, Revised Children’s Manifest Anxiety Scale (RCMAS) and children’s depression inventory (CDI) by Maria Kovacs. Photogrammetric method was applied for measuring forward head and rounded shoulder angle, and a flexible ruler for measuring kyphosis angle. A linear regression test with a %95 level of certainty was used for analysing collected information (P <0.05).
Results: There is a meaningful relationship between depression and anxiety with students’ forward head angle, and depression and electronic entertainments with kyphosis angle (P<0.05). But no meaningful relationship was observed between rounded shoulder angle and mental aspects and physical activity.
Conclusion: A close relationship between psychological factors and upper body posture in female primary school students from Tehran was observed and this issue should be considered while designing preventive and corrective programs.
Dr Siavash Etemadi Nejad, Saed Ahmadi Ganjeh, Dr Jamshid Yazdani Charati, Dr Seyed Esmaeil Hoseininejad,
Volume 6, Issue 4 ( Iranian Journal of Ergonomics 2019)
Abstract
Introduction: The aim of this study was to evaluate the effect of unstable shoes on lower limb kinetic parameters of walking in healthy male students with different geometric shapes. Today, various shoes have been developed to reduce the effects of injury parameters and improve performance parameters for walking.
Methods: 20 of the healthy male lambs were selected 178.96 ± 3.92 cm, 27 ± 3 years old, 73.99 ± 6.6 kg and 42 (EU) number, in four position, domestic production unstable shoes , foreign Similar unstable shoes, regular control shoes, and barefoot, The Kinetic parameters associated with Lower limbs was evaluated by force plate while walking. To examine the significant statistical differences between dependent variables between the four conditions of foot cover, the general linear model and the analysis of variance with repeated data and / or Friedman in the case of normalization of data in the alpha level of 5% using software version 23 SPSS was used.
Results: In relation to the kenetic parameters of the lower extremity, there was no change in the peak Postereior Force and the peak active force in the case when there was a significant change in the peak passive force and peak anterior Force and and the free movment and loading rate.
Conculosion: The results indicate to the domestic production unstable shoes inefficiency in reducing the damage and increasing the comfort of the lower limbs.
Elnaz Rajabi Shameli, Rahman Sheikhhoseini, Shakiba Asadi Melerdi,
Volume 7, Issue 3 (Iranian Journal of Ergonomics 2019)
Abstract
Background and Objectives: Musculoskeletal disorders are common in students and several causes may be considered for them. The aim of this study was to investigate the relationship between school furniture dimensions and trunk posture with musculoskeletal disorders in students of the sixth grade of elementary school in Karaj.
Methods: In this cross-sectional study, 346 boy students in sixth grade of elementary school in Karaj were selected. A flexible ruler was used to measure thoracic kyphosis and lumbar lordosis angles. A 50-centimeter metal ruler was used to record ergonomic and anthropometric data of the students. Spearman’s correlation test was run to analyze the collected data at the significant level of 0.05.
Results: The results showed that only 18%, 12% and 50% of desk height, seat depth and seat height measures were at normal ergonomic conditions, respectively. A negative significant correlation was observed between seat depth and total Nordic score (P<0.05).
Conclusion: It seems that school furniture dimensions in sixth grade boy students of elementary school in Karaj were not in acceptable condition. So, we suggest that ergonomics standardization of school furniture should be considered to prevent its possible consequences.
Bahram Tahmacbi, Mahdi Zare Bahramabadi, Mahshid Izadi, Hamide Abdolhoseini,
Volume 7, Issue 4 (Iranian Journal of Ergonomics 2020)
Abstract
Background and Objectives: Factors affecting one's job performance include job stress, job calling and burnout. The purpose of this study was to determine the causal relationship between job stressors, job calling and job burnout among employees of Hamadan University of Medical Sciences.
Methods: This descriptive-analytical cross-sectional study was performed on 378 non-faculty members of Hamadan University of Medical Sciences. Data were collected using Maslach Burnout Inventory, Job Stress Questionnaire (HSE-Q) and Dik's job calling. To investigate the relationship between variables, Structural Equation Modeling (SEM) method was used in AMOS version 24 software.
Results: The mean age of participants was 38.93 years. The components of job stressors and job calling had a positive and significant correlation with the components of job burnout (P<0.05). The measurement model was acceptable with the collected data. Job stressors indirectly and mediate the dimensions of presence and search of job calling are related to job burnout of medical university employees. The sum of squares of multiple correlations for job burnout variable was 0.56. This finding indicated that occupational stressors and job calling account for 52% of the variance in burnout.
Conclusion: Given the detrimental effects of burnout on employees, it is suggested that authorities reduce stressors such as the psychological and physical needs of the workplace, lack of support, job insecurity, and job calling.
Hosein Hejazifar, Rahman Sheikhhoseini, Hashem Piri, Parisa Sayyadi,
Volume 10, Issue 1 (Iranian Journal of Ergonomics 2022)
Abstract
Objectives: Work-induced musculoskeletal pain disorders are among the most common problems among workers. This study aimed to compare fatigue and trunk and neck postures during work in tailors with and without nonspecific chronic neck pain.
Methods: In this cross-sectional study, 30 sewing machine operators participated voluntarily and were divided in two groups of people with (15 persons) and without (15 persons) chronic nonspecific neck pain. The craniovertebral, cranial, and shoulder angles were calculated three intervals (at the start of work, after 2 hours of continuous work, after 4 hours of continuous work) using the photogrammetric method. Borg scale was used to examine work-induced fatigue. A one-way repeated measure analysis of variance at the significance level of 0.05 was used for data analysis.
Results: There were significant differences in craniovertebral, cranial, and shoulder angle changes (P < 0.001) between the two groups while working. Postural trunk and neck changes were more evident in the nonspecific chronic neck pain group. However, there were no significant differences in terms of fatigue levels between the two groups (P = 0.639).
Conclusion: The upper trunk related posture among workers with nonspecific chronic neck pain may be more negatively affected during work. So it is suggested that maintaining proper posture should be more emphasized among these workers.
Zahrasadat Javadi Hoseini, Hamidreza Mokhtarinia, Mohsen Vahedi,
Volume 10, Issue 2 (Iranian Journal of Ergonomics 2022)
Abstract
Objectives: Work-related musculoskeletal disorders are multifactorial conditions that result in time loss, disability, and increased economical costs. The aim of the current study was to evaluate the role of the physical, environmental and psychosocial factors in the development of musculoskeletal disorders in workers in the production and assembly of auto parts in Qom city in 2021.
Methods: In this cross-sectional study, 211 participants through an inconvenience sampling method entered the study. The demographic characteristics of participants and the prevalence of musculoskeletal disorders were assessed by a self-report questionnaire and the Extended Nordic questionnaire, respectively. The mental workload was evaluated by the NASA-TLX index and the physical, environmental and psychosocial risk factors were evaluated by the Structured Multidisciplinary Work Evaluation Tool (SMET). The binary logistic regression method was used to show the role of the different risk factors in the development of MSDs.
Results: Participants had an average age of 33.9 years (SD = 6.9). The lifetime prevalence of MSDs was obtained at about 77.72% in at least one area of the body. The neck, back, and shoulder areas were the most common regions. Gender, smoking history, surgery history, age, past surgery history, and sports history were most effective in the development of MSDs. In addition, subscales of mental workload play a role in causing pain in the shoulders, upper back, back and knees. SMET subscales play an effective role in the neck (OR = 1.396), upper back (OR = 1.663), hip, and knee, wrist/hand, and ankle/foot pain.
Conclusion: According to the role of various factors in developing disorders, the physical, psychosocial, and environmental factors should be considered simultaneously in planning preventive programs and ergonomics interventions.
Hamideh Abbasi, Mahmood Hoseini Boroojeni,
Volume 10, Issue 4 (Iranian Journal of Ergonomics 2023)
Abstract
Objectives: Proactive personalities, which refer to a person's ability with active behaviors to affect meaningful changes in the environment, are an important factor that affects the formation of job adaptability. The present study was conducted to investigate the effect of active personality on job adaptation with the role of mediator of flourishing at work.
Methods: The research has been a descriptive-analytical survey in terms of practical purpose and terms of data collection. The method of collection was using a questionnaire. In the current research, the standard questionnaire measuring flourishing at work, job adaptability, and active personalities have been used. The statistical population studied was all the employees of the Jundishapur University of Ahvaz, numbering 500 people. According to Morgan's table, the sample size is calculated as 271 people. In this research, the reliability of Cronbach's alpha method and the validity of the method has been confirmed through face validity. The method of analysis, description, and inference has been. IMOS software was used to test the hypotheses.
Results: The findings show that active personalities are effective for a job with a mediating role of flourishing at work. The effect of flourishing at work on job adjustment, the effect of active personality on job adjustment, and the effect of active personality on flourishing in the workplace have been confirmed.
Conclusion: The results show what personalities make people progress in the workplace, which in turn improves job adaptability. It is recommended that career counselors design interventions to promote career adjustment.
Seyed Ghafar Hoseini, Ebrahim Zarinkalam, Reza Heidary, Majid Jalili,
Volume 11, Issue 4 (Iranian Journal of Ergonomics 2024)
Abstract
Objectives: The maximum aerobic capacity (VO2max) is the most important indicator of physical fitness, which is closely related to the general health of the body. Considering the problems of laboratory measurement of VO2max, estimating VO2max by non-exercise equations will be one of the alternative solutions. This study aims to evaluate the validity of the native non-exercise equation in estimating VO2max of healthy adolescent boys.
Methods: The variables of age, height, weight, and body mass index were measured in 248 healthy boys aged 15 to 18. The subjects' VO2max was measured and predicted by exercise test and non-exercise native equation respectively. To evaluate the validity of the native non-exercise equation, Pearson's correlation, paired t-test, and Bland-Altman's agreement were used.
Results: There is a significant correlation between measured and predicted VO2max (R = 0.76, p<0.05). Also, no significant difference was observed between predicted and measured VO2max (43.10 ml/kg/min and 43.38 ml/kg/min respectively) (mean difference=0.28 ml/kg/min, P>0.05). Also, the Bland-Altman graphic diagram indicated agreement between the methods of measuring and estimating VO2max.
Conclusion: In the present study, the native non-sports equation had a high validity in estimating VO2max of adolescent boys. It seems that the use of non-sports VO2max equations can be used as a simple, safe, and low-cost tool to evaluate the maximum aerobic capacity of students at a wide level.
