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Showing 3 results for Sharifi
Ergonomic Redesign of Industrial Chair
Zahra Sharifi, Reza Osqueizadeh, Seyyed Farhad Tabatabai Ghomshe,
Volume 3, Issue 1 (Journal of Ergonomics 2015)
Abstract
Introduction: Job satisfaction and productivity among industrial workforce depend on multiple factors. Among these factors, designing the workstation based on bodily characteristics and dimensions of the workers is of critical significance. Since industrial chairs have direct impacts on biomechanical and anthropometric compatibility, they play a major role in enhancing workers’ interaction with their workplace. The current study approached the redesign of such a product with a focus on ergonomics. Materials and Methods: The present research was a typical combined design project. In the quantitative phase, 90 participants underwent 12 anthropometric measurements (which were important in designing industrial chairs). The underlying cognitive aspects of the question were evaluated via qualitative methodologies. Results: Since normal distribution of the data was confirmed, raw anthropometric data were descriptively processed and reported. Cognitive assessments revealed correlations between correct form and softness of the backrest, and appropriate slope of the seat-pan, being a main factor determining the level of comfort while interacting with industrial chairs. Conclusion: Diverse physical constraints and conditions caused by the variety of duties and workstations have made it somehow difficult for specialists to design a universal industrial chair functioning in all different contexts. Nevertheless, the current study confirmed the effectiveness of involving personnel in redesigning the workplace and easing the challenges.
The Impact of Mental Workload Levels on Physiological and Subjective Responses
Majid Fallahi, Majid Motamedzade, Zahra Sharifi, Rashid Heidari Moghaddam, Alireza Soltanian,
Volume 4, Issue 3 (Journal of Ergonomics 2016)
Abstract

Introduction: Advances in technology and the use of complex systems at work have imposed high mental workloads to operators; so, continuous monitoring of mental workload can help to prevent mental problems and maintain mental health. Therefore, this study aimed to investigate the impact of mental workload on physiological and subjective responses.

Methods: This cross-sectional descriptive-analytical study was performed on 16 healthy university students in 2014 at a laboratory setting. Physiological parameters of surface electromyography and electrocardiography in six blocks (resting, high mental work, moderate, low, very low and recovery) were measured using NeXus-4. After performing each block, the NASA-TLX questionnaire was completed. Statistical analysis was conducted using SPSS software version 21.0. A 5% significance level was adopted in all the tests.

Results: The results showed significant differences for the average score of NASA-TLX between the different levels of mental work load (P < 0.05). Also, the analysis of repeated measures variance showed significant differences for heart rate and heart rate variability parameters in the six blocks (P < 0.05), but no significant difference was observed for the shoulder muscles activity.

Conclusions: Different levels of mental work load can impact on people's subjective responses and some of their physiological responses. Thus, in such workplaces, it will be necessary to conduct an ergonomic program to manage mental health.


Study the relationship between the physical activity and work ability index to office workers and operatives
Zahra Ordudari, Shiva Soury, Ehsanollah Habibi, Zahra Sharifian,
Volume 6, Issue 2 (Journal of Ergonomics 2018)
Abstract
Introduction: Regular physical activity plays an important role in the prevention of low back pain, osteoporosis, cardiovascular disease, obesity, diabetes, cancer, hypertension, depression and early death. Also, work ability is related to the interactions between physical and mental ability, working conditions, employee efficiency, and employee health status. In this research, the relationship between work ability and the level of physical activity is investigated.
Materials & Methods: This study was descriptive-analytical and cross-sectional, which was conducted among 120 office workers and operatives. Physical activity and work ability index were measured using physical activity questionnaire and Iranian version of work ability index. Data analysis was performed using SPSS20 and (P <0.05) was considered significant.
Results: In this study, gardeners and office workers respectively,had the highest and lowest levels of physical activity with the mean of 4206.09 and 3567.58. However, work ability almost was the same in all groups. Also, Pearson correlation coefficient showed that there was no significant relationship between work ability index and physical activity.
Conclusion: According to the results,the work ability index of subjects was good and physical activity was high. Also, there was no significant relationship between work ability index and physical activity, thus making plans to promote the work ability index should be a priority in the intervention program.
 

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