Showing 9 results for Allahyari
Farin Khanehshenas, Teimour Allahyari, H.reza Khalkhali,
Volume 1, Issue 3 (Journal of Ergonomics 2014)
Abstract
Introduction: Bank staff experience high level of job stress due to the nature of their work. One of the consequences of stress is its impact on job performance. Since the internal studies in this area are relatively rare, this study was conducted to investigate the relationship between the psychosocial stressors and job performance among bank staff.
Materials and Methods: All staff of the bank branches participated in this study. The General Nordic Questionnaire and Human Resource Productivity Questionnaire were used for data collection. The correlation coefficient and regression models were employed to examine the relationship between job stressors and their scales as independent variables and job performance as the dependent variable. Furthermore, in order to accurately assess the relations between variables, structural equation models were utilized.
Results: The results revealed that the prevalence of stress among bank staff was in moderate level (46.6%). Meanwhile, there was a negative and significant relationship between stress in "task domain" and "socio-organizational domain" and job performance. Among the measures in socio-organizational domain, organizational culture and leadership showed highly negative and significant relationships with job performance (p= 0.001).
Conclusion: According to the obtained results, socio-organizational domain can be considered as the main cause of loss of productivity. Hence, it is suggested to make further attempts to control the psychosocial factors in workplaces and avoid performance deterioration, particularly in organizational culture and leadership measures.
Teymour Allahyari, Sara Hedayati, Hamidreza Khalkhali, Fariba Ghaderi,
Volume 2, Issue 2 (Journal of Ergonomics 2014)
Abstract
Background: Patient Manual handling is one of the major risk factors in musculoskeletal disorders among healthcare workers (HCWs). Therefore, the purpose of this study was to estimate the mechanical force on the low back of the staff responsible for patient manual handling and to exam in the effect of patient manual handling by two people on the level forces exerted on HCWs ҆ low back.
methods: the participants of this study were 10 health care workersdoing patient manual handling individually and by two people . To determine the posture of these people, we filmed them both from front and side and force plate was used to determine the weight of the patient handling by HCWs. 3DSSPP was used to estimate theforces exerted on the their low back during patient manual handling.
Results: Results showed that among the four studied tasks, the maximum compression forces exerted on discs L4/L5 and L5/S1 were 3591 ± 863 and 3342 ± 827 respectively when the patient was seated on wheelchair. The Maximum shear force exerted on the disc L4/L5 and L5/S1 were 252 ± 122 432 ± 36 N respectively when patient was seated on the bed. No significant difference was seen in the average forces exerted on low back except seating patient on wheelchair. ( P> 0.05)
Conclusions: The comparison of exerted force on disks with recommended limits revealed that only the task of placing patient on wheelchair exerted force on low back exceed NIOSH recommended weight limit. patient manual handling by two people most tasks of this study does not created significant difference. Therefore to reduce exert force on low back need ergonomic intervention including bed design, beds appropriate stabilization, training.
Parisa Hosseini Koukamari, Abdolzahra Naami, Teimour Allahyari,
Volume 3, Issue 1 (Journal of Ergonomics 2015)
Abstract
Introduction:
Adaptive performance is defined as an employee’s ability to deal with changes and new and unusual situations
in the workplace. The present study
mainly focused on factor analysis of the Adaptive Performance Scale (APS) and
determining its validity and reliability. Adaptive
performance is a multi-dimensional
structure with five
latent factors.
Materials and Methods: This method
validation study was conducted in Ahvaz, Iran. 210 randomly selected
public hospital nurses completed the Persian version of the APS. Exploratory factor analysis (varimax rotation) was used to explore the
factor structure of the scale. Confirmatory factor analysis and structural equation modeling were applied
to fit the model.
Results: The
overall reliability of the APS was confirmed (Cronbach’s alpha = 0.89). Factor
analysis was used to evaluate the factor structure of the scale. Kaiser-Meyer-Olkin index (0.88) and
Bartlett's sphericity test result (1639.093) were both significant.
Finally, varimax rotation showed all items to have significant factor loadings.
Conclusion: Our findings
confirmed the acceptable psychometric properties (reliability
and validity) of the APS for administration among nurses. Therefore, the
adaptive performance construct contains five distinct dimensions, namely dealing with emergency and
unexpected situations, work stress
management, creative problem solving,
learning, and interpersonal adaptability. These results are consistent
with previous studies.
Teimour Allahyari, Sholeh Jafari, Hamidreza Khalkhali,
Volume 3, Issue 3 (Journal of Ergonomics 2015)
Abstract
Background: Power and pinch hand grip strengths are major clinical and ergonomic parameters contributing to the hand muscle power. The data on hand grip strength measurements can have many benefits, including application in the design of hand tools. The present study was conducted to measure power hand grip strength among male and female students aged 19 to 36 using a Jamar Dynamometer and to compare their measurement data with the data obtained from other groups of the population.
Materials and Methods: The present cross sectional study was conducted on 234 male and female students aged 19-36 in Urmia University of Medical Sciences. Hand grip strength was measured using Jamar hand dynamometer and according to the Southampton protocol for adult grip strength measurement.
Results: The mean (±standard deviation of) hand grip strength calculated was 44.39 (±9.71) in the male students 20.48 (±5.86) in the female students. A high correlation was observed between the power hand grip strength in the left and right hands (r=0.94 and P<0.001) and a significant difference then between the power hand grip strength in the dominant and non-dominant hands.
Conclusion: The findings of the present study and similar studies about power hand grip strength in the Iranian population can be used by ergonomists and manufacturers to improve the design of hand tools and the performance of tasks requiring hand muscle power.
Roya Emamgholizadeh Minaei, Mohammad Hajaghazadeh, Teimour Allahyari, Hamidreza Khalkhali, Mansoor Keramat,
Volume 4, Issue 1 (Journal of Ergonomics 2016)
Abstract
Introduction: Foot anthropometric dimensions could be useful in designing comfortable footwear. The objective of this study was the measurement of foot anthropometric dimensions in a group of students.
Methods: This was a descriptive study in which 21 dimensions of foot for 580 males and females were measured manually. To measure the foot dimensions, a digital caliper and a tape were used. The measured dimensions included the important lengths, widths, heights and girths of foot. Descriptive statistics such as percentiles, mean and standard deviation were calculated for the collected data. To test and survey of the mean of foot dimensions between males and females, statistics such as independent t-test and effect size (Cohen’s d) were used.
Results: The values of mean, standard deviation, the 5th, 50th, and 95th percentiles were calculate and tabulated for the total studied population and for gender. In all measured foot dimensions, males had bigger dimensions than females. Gender had different impacts on the measured foot dimensions. The mean of all foot dimensions was significantly different between males and females (P value = 0.001). Digital pattering of I and II were observed in 78% and 22% of the studied population, respectively.
Conclusions: In the present study, important anthropometric data of foot were collected for a group of students. The presented percentiles could be used in design of male and female shoes. Conducting similar studies in children with different age categories could help completion of the anthropometric database.
Samaneh Asadi, Teimour Allahyari, Hamidreza Khalkhali , Alireza Choobineh ,
Volume 5, Issue 2 (Journal of Ergonomics 2017)
Abstract
Introduction: Psychosocial factors and fatigue are significant factors in nurses’ performance. Since the relationship between psychosocial factors and fatigue has been rarely studied, the aim of this study was investigating the relationship between psychosocial work factors and fatigue among nurses.
Method: In this cross-sectional study, 270 nurses from hospitals of Urmia University of Medical Sciences randomly participated. The Job Content Questionnaire and Swedish Occupational Fatigue Inventory were used for data collection. Pearson’s correlation coefficient and Structural Equation Modeling were used for data analysis.
Results: The mean (SD) of control was 66.32 (7.36), psychological job demand 35.47 (3.68), social support 22.31 (2.64), physical job demand 15.22 (2.18), and job insecurity 8.72 (4.06). Control and social support dimensions had low levels. Moreover, psychological and physical job demand had high levels, which indicates a high stress level. According to the results, psychological and physical job demand had a significant relationship with all dimensions of fatigue (P < 0.001).
Conclusions: The majority of nurses were exposed to high levels of job stress. Among psychosocial factors, physical demand was identified as the most effective factor on fatigue. Any comprehensive interventional program regarding psychosocial work factor in order to reduce job stress and fatigue can improve health care quality and also prevent medical errors.
Teimour Allahyari, Ali Mahboubi,
Volume 12, Issue 1 (Iranian Journal of Ergonomics 2024)
Abstract
Objectives: Nowadays, due to the increase in the volume of accidents, pre-hospital emergency personnel, as the frontline of treatment by providing relief and assistance to patients and victims of various incidents, have encountered various work-related challenges and problems, including cardiovascular diseases, digestive diseases, excessive fatigue, and reduced sleep quality. In this regard, the present research aimed to study the relationship among shift work, sleep quality, and work ability index in pre-hospital emergency personnel.
Methods: This research was performed on 102 operational personnel of a pre-hospital emergency department in Urmia, Iran. After the collection of demographic information, the number of work shifts per week, the number of working hours per month, the quality of sleep, and the work ability of the personnel were measured by the Petersburg sleep quality questionnaire and work ability index questionnaire. The relationship between research variables was investigated using correlation coefficient, Fisher's exact test, and one-way analysis of variance tests.
Results: Mean total sleep quality score of the personnel was 6.01 ± 2.38, which indicated poor and unfavorable sleep quality. Moreover, work ability index scores of 34.3%, 52%, and 13.7% of participants were at poor, moderate, good, and excellent levels, respectively. Regarding the comparison between the two variables of shift work and sleep quality, there was a significant difference, and a strong and significant relationship was observed between sleep quality and work ability index.
Conclusion: Through the increase in the number of work shifts and working hours, the sleep quality of the personnel became unfavorable and weak which led to a decrease in the work ability index score and a reduction in the job performance of the personnel. Reduction of working hours, usage of young people with high work ability, management and control of the number of work shifts of the personnel by considering resting and closure time, consideration of morning-evening and night shifts in a balanced and equal manner, and prevention of people from working in monotonous shifts (activity only in the form of night work or only day work), and avoidance of working in consecutive work shifts without rest and vacation in order to improve the quality of sleep and work performance is recommended.
Sahel Fouri, Teimour Allahyari, Iraj Mohebbi,
Volume 13, Issue 1 (Iranian Journal of Ergonomics-In Press 2025)
Abstract
Objectives: Traffic accidents are considered among the leading causes of mortality and severe injuries. Driver behavior is a significant factor influencing this issue. The present study aimed to investigate the status of unsafe driving behaviors and their relationship with road accidents among inter-city drivers in Urmia, Iran, in 2023.
Methods: This cross-sectional study was conducted on 378 inter-city drivers visiting the Occupational Medicine Center at Urmia University of Medical Sciences, Iran. Sampling was performed using a convenience method. The Driver Behavior Questionnaire (DBQ) was employed as the standard instrument. Data analysis was conducted using the SPSS (version 24) software at a significance level of 0.05.
Results: The highest score for unsafe behaviors was related to non-routine violations, with a mean of 1.33±0.44. Significant positive correlations were found between all four DBQ subscales and road accidents (P<0.001). Linear regression analysis revealed that routine violations and errors significantly predicted 24.3% of the variance in annual accidents.
Conclusion: The present work demonstrated significant associations between unsafe driving behaviors and traffic accidents, emphasizing the need for targeted interventions to reduce high-risk driving behaviors.
Teimour Allahyari, Akram Mahmoodi,
Volume 13, Issue 2 (Iranian Journal of Ergonomics-In Press 2025)
Abstract
Background and Objectives: In today’s demanding work environments, workforce resilience and ergonomic climate are recognized as critical factors for maintaining employee well-being and enhancing organizational productivity.
Methods:This cross-sectional, descriptive-analytical study investigated the relationship between ergonomic climate and employee resilience in a gas company. A total of 170 employees were selected through cluster random sampling. Data were collected using two validated instruments: the Ergonomic Climate Questionnaire and the Connor-Davidson Resilience Scale (CD-RISC). Statistical analyses were conducted using SPSS version 26, including descriptive statistics, Pearson correlation, one-sample t-tests, and regression analysis. Results:The findings indicated that the mean scores for ergonomic climate, operational performance, employee well-being, and individual resilience were significantly higher than the midpoint of the Likert scale. A positive and significant correlation was observed between all dimensions of ergonomic climate—namely, management commitment, employee involvement, hazard identification and control, and training and knowledge—and individual resilience. However, no significant relationships were found between demographic variables (age, gender, education, work experience) and resilience.
Conclusion: A favorable ergonomic climate plays a significant role in reducing stress and improving the psychological conditions of the workplace. Enhancing physical and mental health, reducing stress, increasing job satisfaction, and improving the quality of work life can all positively influence employees’ resilience in various ways. Therefore, organizational attention to ergonomic issues and the implementation of supportive strategies to improve workplace ergonomics can lead to an increased level of individual resilience among employees.
