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Evaluation of Factors Affecting Job Burnout in Employees of Regional Electric Company, Kerman, Iran
Mohammad Babamiri, Azita Zahiri, , Zekrollah Morovati, Majid Yousefi Afrashte, Yousef Dehghani,
Volume 3, Issue 4 (Journal of Ergonomics 2016)
Abstract

Introduction: Job burnout can have negative effects on organizations and their employees. This study tried to investigate the relationships between job burnout and occupational stress, the four dimensions of organizational justice, personality characteristics, role clarity, and role overload.

Material and Methods: All full-time employees of the Regional Electric Company of Kerman (n = 200) were selected as the study sample. Finally, 138 usable questionnaires were collected. Previously designed questionnaires were used to measure work overload, occupational stress, role calrity, and organizational justice and respect. Maslach Burnout Inventory and NEO were also administered. Pearson’s correlation and multiple regression analyses were applied to analyze the data. All analyses were performed using SPSS 16.0.

Results: Job burnout was significantly related with occupational stress, distributive justice, extraversion, role clarity, role overload, organizational respect. Multiple regression analysis suggested distributive justice, overload, procedural justice, and occupational stress as the best predictors of job burnout. These factors explained 48% of the variance in burnout.

Conclusion: According to the results of this study, policymakers and planners of the organization are recommended to pay more attention to parameters contributing to job burnout. This will prevent job burnout among the personnel and promote organizational efficiency.


Effect of Workstation Designed for Sewing, on Neck and Shoulder Muscles of Users
Siavash Etemadi Nejad, Seyyed Esmail Hosseininejad, Jamshid Yazdani Charati, Fariba Ghaempanah, Mahmoud Yousefi Chemazkati, Mojtaba Ahmadi, Ali Amani,
Volume 7, Issue 4 (Iranian Journal of Ergonomics 2020)
Abstract

Background and Objectives: Sewing is one of the occupations where the prevalence of musculoskeletal disorders is high. Sewing conditions at the workstation have made tailors face musculoskeletal injuries in various areas of their body, particularly pain in the neck, shoulder, and upper back and even waist. The purpose of this study was to evaluate the effect of a workstation designed for tailoring considering the results of previous studies on the neck and shoulder muscles of users by electromyography.
Methods: In this interventional analytical study, the activity levels of four superficial neck and shoulder muscles (meridian, anterior deltoid, middle deltoid, posterior deltoid) were Electromyographed on 33 participants (male and female) at two new and custom designed workstations.
Results: There was a significant difference in the amount of muscle activity in the new and existing workstations (P<0.05). But there was no significant difference between the different modes of the new workstation.
Conclusion: All four muscles were less active at the new workstation than the conventional workstation, meaning that the designed workstation was able to reduce neck and shoulder muscle activity during work.


Study of Work Ability Index (WAI) and Its Association with Demographic Characteristics Among Firefighters
Ramin Rahmani, Raheleh Hashemi Habybabady, Mohammad Hossein Mahmoudi, Haniyeh Yousefi, Siavash Shahnavazi,
Volume 9, Issue 1 (Iranian Journal of Ergonomics 2021)
Abstract
Background and Objectives: Assessing the workability of employees is very important, and firefighting is one of the critical jobs. Therefore, the aim of this study was to evaluate the work ability index (WAI), and identify some effective factors among firefighters.
Methods: This cross-sectional study was carried out with participation of 101 firefighters in Zahedan, Iran in 2018. Subjects were included in the study by census method. Data were collected using a two-part questionnaire (demographic information and WAI items), and data analysis was performed using SPSS 24.
Results: The mean of age and work experience of the subjects were 34.18±6.70 and 8.47±6.79 years, respectively. Only 18 individuals (17.8%) were single, and most of them exercised at least once a week. The mean score of WAI was 44.33±3.56 and most of the subjects were in the excellent range. With increasing age and work experience, WAI decreased, and there was also a significant relationship between marital status and weekly exercise with WAI.
Conclusions: In general, the condition of the firefighters was favorable in terms of workability. However, due to the relationship between personal characteristics and WAI, it is necessary to adjust the duties of older people with more work experience.

Comparison of Common Mechanisms in the Design of Hip Belts in Backpacks on the Coordination between Trunk and Hip Segments during Walking
Faridah Aghahasni Mahabadi, Abbas Farjad Pezeshk, Mohammad Yousefi,
Volume 12, Issue 2 (Iranian Journal of Ergonomics 2024)
Abstract
Objectives: Using a backpack with a hip belt limits hip movements and prevents disruption in hip and trunk coordination. Therefore, this study aimed to compare the effect of common mechanisms in the design of hip belts in mountaineering backpacks on the coordination between trunk and pelvis organs during walking.
Methods: This semi-experimental research was conducted on 16 men. Three types of backpacks with different hip belts were used. Participants carried backpacks with a load of 13 kg. The continuous relative phase and its variability were used to analyze the coordination. Descriptive statistics of mean and standard deviation and analysis of variance with repeated measures were used to compare variables in four conditions.
Results: According to the results, there was a difference between the level of coordination in two conditions of without a backpack and a normal backpack, with the normal backpack showing a significant decrease in coordination (P<0.05). The results also indicated that the variability in coordination increased after using backpacks with movable hip belts and cross frames compared to walking without a backpack (P<0.05).
Conclusion: Based on the existing findings, backpacks with a cross-movable frame maintain the antiphase coordination between the trunk and pelvis by allowing freedom of movement in these two organs. It also creates more flexibility by increasing variability in coordination.

Muscular Synergy of Trunk and Hip Segments in Carrying Hand Loads with Different Weights in Healthy Young People
Saeed Ilbeigi, Masoumeh Al-Eghabi, Mohammad Yousefi, Mohammad Hamed Hosseini,
Volume 12, Issue 3 (Iranian Journal of Ergonomics 2024)
Abstract
Objectives: Designing one-handed carrying tasks based on biomechanical findings has a significant impact on preventing musculoskeletal injuries. The present study was conducted to investigate the muscle synergy of the trunk and pelvis in the manual carrying of loads with different weights in healthy young people.
Methods: In this experimental study, 20 male volunteers performed the walking protocol without load, carrying different weights of 5%, 10%, and 15% of their own weight during unilateral manual load carrying. The electrical activity of the trunk and pelvis muscles while carrying loads of different weights was recorded using an electromyography device (Biovision). To evaluate the differences between different load-carrying conditions, a repeated measures test was used at a significance level of P≤0.05.
Results: The results showed that in the performance of manual load carrying, there was a significant difference between muscle synergy (synergy size) in all walking protocols, including 5% and 10% of body weight and 5% and 15% of body weight and between 15% and 10% (P≤05). While in the performance of manual load carrying, a significant difference was found between muscle synergy (synergy direction) in 5% of body weight and 10% of body weight, this difference was not seen in manual load carrying with 5% of body weight and 15% of body weight and also between synergy of 15% and 10% (P≥0.05).
Conclusion: It seems that the difference in muscle synergy in terms of size in unilateral manual load carrying can, with increasing load, create more tension in the back and pelvic muscles; however, the direction or angle does not change compared to the no-load state.

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