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Showing 3 results for Salimi
Effects of elbow and forearm support on upper trapezius muscle fatigue while typing
Mohamad Hosein Ghasemi, Abed Salimi, Mehrdad Anbarian, Maasome Fadaee, Sara Moghadasi, Hamed Esmaeeli,
Volume 3, Issue 1 (Journal of Ergonomics 2015)
Abstract
 

Introduction: Today, computers are widely used in many homes and workplaces. The relationship between computer use and musculoskeletal disorders in the neck and upper extremities has been well documented. Muscle fatigue in the shoulder and arm regions is one of the most frequently reported problems in computer users. Supporting the upper extremities has been suggested as a way to reduce the static load on upper body muscles while using a keyboard. The purpose of this study was to determine the effect of elbow and forearm support on upper trapezius muscle fatigue while typing.

Materials and Methods: Eight students of Bu-Ali Sina University (Hamadan, Iran) participated in this quasi-experimental study. The surface electromyography activity of the upper trapezius muscle of the dominant side was recorded in three positions, namely without elbow support, elbow support with the table, and elbow support with a pad while typing. The muscle fatigue index for the three typing positions was calculated based on the median frequency slope of the raw electromyography signals. Repeated measures analysis of variance (ANOVA) was employed for statistical analyses.

Results: Median frequency slope decreased significantly in elbow support with the table in comparison with non-support position (p = 0.04). There were no significant differences between elbow support with a pad and other two positions.

Conclusion: These results suggested elbow support as a mechanism to delay trapezius muscle fatigue and thus increase task efficiency. More research is required to determine the advantages or disadvantages of using different pads.

       
A Survey lifting the cylindrical things and comparing them with the NIOSH lifting index
Dr Ehsanollah Habibi, Emad Mirsalimi, Faezeh Darabi, Kamran Ebrahimi,
Volume 6, Issue 4 ( Iranian Journal of Ergonomics 2019)
Abstract
Background and Objectives: This study focused on lifting drill rods. Drilling is a repetitive and heavy mining operation with a high incidence and severity of musculoskeletal injuries. The purpose of this study was to examine how to lift a vertical drill bit (1.61m and 35kg in height) using two types of rod height and four feet positions, and finally compare them with the Lifting Index (LI).
Methods: Seven workers participated in this study. Each person raised a rod and held it vertically. Reflective markers were installed on each person, and from three cameras and an Ergo-meter plate for record forces and Movement of the limbs. In this case, four positions of the foot and pressures on the lower back were Investigated (position0=to the rod, position45=diagonally to the rod, position90=right side of the bar and free posture). In addition, two positions of the height of the rod were Investigated, at the first, the end of rod was on the ground (height of the rod was 83 m), and in the following the end of rod was on the Basket with height 20cm (rod height of 1.03 m).
Results: The Lifting Index (LI) for each person was equal to 1.4 in the NIOSH lifting equation. It was found that the vertical height of the rod had the greatest effect at the load on the lower back. Some workers use techniques that endure less pressure on their waist.
Conclusion: Finally, it was found that the asymmetric loading Condition (90 ° angle) was the worst case compared to the Lifting index and NIOSH standard.
 
A Study on the Status of Cognitive Failures and Their Relationship with Individual Factors and Personality Traits among Midwives Working in Kermanshah Province
Seyedeh Aghdas Hosseini, Zeynab Moradian Haft Cheshmeh, Fardin Zandsalimi, Mahsa Mashayekhi,
Volume 12, Issue 4 (Iranian Journal of Ergonomics-In Press 2025)
Abstract
Objectives: Cognitive failures are important for reducing accidents and improving performance, and they depend on multiple factors. Given that this issue has received less attention among midwives, the present study aimed to determine the status of cognitive failures concerning individual factors and personality traits among midwives.
Methods: This cross-sectional study was conducted in the summer of 2024 on 211 midwives working in Kermanshah province in Iran. The samples were selected using a convenience sampling method. In addition, a standard three-part questionnaire was used. The first part included demographic information, and the second and third parts included questions from the Cognitive Failures Questionnaire and the short form of the NEO Personality Inventory. Moreover, data were analyzed using the SPSS (version 24) software.
Results: The mean age and work experience of the midwives participating in this study were 36.22±8.03 years and 10.38±7.85 years, respectively. The overall scores for cognitive failures in memory, action, and attention were 16.79±3.04, 17.41±2.80, and 16.30±3.62, in respective order. The results revealed a positive relationship between age, work experience, and body mass index (BMI) with cognitive failures and a negative relationship between exercising and cognitive failures. Neuroticism, agreeableness, and openness were positively related to cognitive failures, while conscientiousness was negatively related to cognitive failures.
Conclusion: The status of cognitive failures in the action dimension was more unfavorable than the other two dimensions. Some individual and personality traits were directly, and others inversely related to cognitive failures. Further research in this area is necessary.

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