Showing 8 results for Habibi
Shirazeh Arghami, Maryam Moradi, Fatemeh Habibi,
Volume 3, Issue 3 (Journal of Ergonomics 2015)
Abstract
Background: Driver’s fatigue is a major factor contributing to the prevalence of road accidents. A vast number of city dwellers in most countries use public transport bus services to move around the city. Driver’s fatigue causes job burnout and affects the risk of a traffic accident injuring the public. Several methods have been used to date for evaluating mental fatigue however, using questionnaires tends to be a less time-consuming and more accessible technique. The present study was therefore conducted to develop a mental fatigue questionnaire for public transport bus drivers.
Materials and Methods: The study was conducted based on the criteria used for qualitative research. Semi-structured interviews were held with public transport bus drivers using probing questions and data were collected until their saturation so as to enable access to a direct description of mental fatigue by the bus drivers. Data saturation occurred with 30 interviews and sampling was then discontinued. The analysis of the interviews led to the extraction of the themes and an initial list of questionnaire items was then developed. The psychometric properties of the questionnaire were then evaluated through examining the content validity and internal consistency of the items. The content validity of the items was calculated using Lawshe’s table. A minimum CVR of 0.99 and a minimum CVI of 0.75 denoted an acceptable content validity for the items. To determine the internal consistency of the items, 200 bus drivers completed the final version of the questionnaire. The data obtained were then analyzed in SPSS-16 using Cronbach's alpha to measure the reliability of the questionnaire and considering an acceptance level of 0.7.
Results: The interviews conducted at the beginning of the study with 30 drivers led to the emergence of an initial list with 26 items. A total of 9 items with a CVR less than 0.99 were omitted from the list and 17 items with adequate simplicity, clarity and correlation between them and which had a minimum CVI of 0.75 were kept. The questionnaire had a Cronbach's alpha value of 0.87 and was therefore considered a reliable tool.
Conclusion: The questionnaire developed in this study has a good validity and reliability and can therefore be used to assess mental fatigue in public transport bus drivers.
Ehsanollah Habibi, Esmaeil Farrokhi, Marjan Mansourian,
Volume 4, Issue 1 (Journal of Ergonomics 2016)
Abstract
Introduction: Musculoskeletal disorders are the major health problems in nurses. One of the main reasons is patient transfer. The work technique of nursing personnel during patient transfers has been evaluated using different methods. One of the most useful ones is Direct Nurse Observation Instrument (DINO). The purpose of the present study was to assess the musculoskeletal disorders risk related to patient transfer in nursing personnel using the DINO method.
Methods: This cross-sectional study was carried out among 250 nurses working in affiliated hospitals of Isfahan University of Medical Sciences, Isfahan, Iran in 2015. Data were collected by Nordic questioners and DINO index check list. The validity and reliability of DINO checklist were reviewed and approved. For data analysis, independent t-test, chi-squared test and logistic regression were used.
Results: The average result of DINO checklist was 9.73 points (SD = 1.8), which can suggest that the way in which the technical transfer was carried out might not have been the safest. The results showed that the occurrence of musculoskeletal disorders in nursing staff was significantly associated with final scoring of the DINO index (P < 0.001).
Conclusions: According to the findings, DINO was an appropriate tool to assess musculoskeletal disorders risk due to patient handling in the nursing personnel. This method can be used in the evaluation of patient transfer educational programs and also to identify and assess an unsafe work techniques used by nurses.
Ehsanollah Habibi, Mina Salehi, Ali Taheri, Ghasem Yadegarfar,
Volume 5, Issue 4 (Journal of Ergonomics 2018)
Abstract
Background: Recently adaptive neuro-fuzzy inference system is used for the classification of physical load based on three parameters including %HRmax, HRrest, and body weight. The aim of this study was to optimize this model to reduce the error and increase the accuracy of the model in the classification of physical load.
Methods: The heart rate and oxygen consumption of 30 healthy men were measured during a step test in the laboratory. The VO2max of the participants was measured directly during a maximal treadmill test. A relationship was observed between the calculated %VO2max which is considered as the gold standard of physical load and the model inputs using ANFIS in MATLAB software version 8.0.0. the genetic algorithm was then applied as an optimization technique to the model.
Results: accuracy, sensitivity, and specificity of the model increased after optimization. The average of accuracy accelerated from 92.95% to 97.92%. The RMSE decreased from 5.4186 to 3.1882. Also, in %VO2max estimation, the maximum error of the mode was ±5% after optimization.
Conclusion: The results of this study show that the use of Genetic Algorithm during training process can increase the accuracy and decrease the error of ANFIS model in the estimation of%VO2max. . The advantages of this model include high precision, simplicity and applicability in real-world working environments and also interpersonal differences.
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.
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.
Zahra Ordudari, Farzane Fadaei, Ehsanolah Habibi, Akbar Hassanzadeh,
Volume 7, Issue 3 (Iranian Journal of Ergonomics 2019)
Abstract
Background and Objectives: Musculoskeletal disorders cause about half of all work-related disease, and are the major cause of loss of time, increased costs, and labor injury. This study aims to evaluate the workload and its association with the prevalence of wrist disorders. It was carried out in the assembly workers of a manufacturing industry.
Methods: This cross-sectional study was conducted among 120 female workers employed. Theit mental workload, physical workload and prevalence of wrist MSDs were evaluated using the NASA-TLX, the OCRA method and the Nordic wrist and hand scan questionnaire respectively.
Results: The NASA-TLX showed that the physical demands and effort with mean scores of 78.79 and 78.37 were respectively the most important subjective mental workload (SMWL) scale. Also The results on the basis of the OCRA risk level showed that the highest right-hand risk was at risk level 3 and the highest left-hand risk was at risk level 1 .The Statistical analysis showed that OCRA risk levels and mean scale physical demands and efforts were significantly higher in those with wrist pain than those without pain (P<0.05).There was a direct correlation between the severity of the wrist pain with the OCRA risk index in both hands (P=0.001) and the total score of NASA (r=0.232, P<0.05).
Conclusion: It was revealed that mental load was high in assembly lines of the manufacturing industry and this result was also confirmed by physical evaluation. This study indicated that overall score of SMWL can affect the incidence of MSDs. That is why mental workload should be considered as a risk factor for MSDs.
Farin Khanehshenas, Peymaneh Habibi, Seyed Abolfazl Zakerian,
Volume 7, Issue 4 (Iranian Journal of Ergonomics 2020)
Abstract
Background and Aims: Ergonomics is associated with the study and systematic design of the workplace to improve human health and well-being. The health and well-being of employees are influenced by a variety of factors. Nature is a new paradigm in occupational ergonomics that has not been well explored in the main texts of ergonomics in relation to human well-being. Therefore, the main purpose of this study was to investigate the results of joining with nature on staff health, especially well-being in the form of a systematic review study.
Methods: By searching articles published from 2000 to 2019 in the field of Biophilic design, 25 articles were selected for the present systematic study based on the research criteria. Non-English language articles excluded.
Results: The results of this study showed that Biophilic design is associated with improved human well-being, performance, concentration and stress reduction.
Conclusion: Organizations, with the help of ergonomists, should consider such changes in the workplace, and nature-based solutions as strategic programs for improving well-being rather than merely applying a temporary strategy that changes the physical condition of a building or its landscape.
Ali Davoodizadeh, Mohsen Aliabadi, Majid Habibi Mohraz, Maryam Farhadian, Masoud Shafiee Motlagh,
Volume 11, Issue 2 (Iranian Journal of Ergonomics 2023)
Abstract
Objectives: This study aimed to investigate the effectiveness of cooling vests based on nanofibers and packages of phase change materials (PCM) in reducing the thermal stress of medical personnel in hot workplaces.
Methods: In this experimental study, 20 males were exposed to 10 combined scenarios of temperatures of 24°C and 32°C in a room simulating atmospheric conditions and having 5 samples of cooling vests. Physiological parameters, including skin surface temperature, tympanic temperature, and oral temperature were measured before and after exposure to air temperature conditions by simulating the activity metabolism of hospital workers. The normal distribution of the data was checked with the Kolmogorov-Smirnov test, and the analysis of the effect of the scenarios was performed through the analysis of variance with repeated measurements.
Results: The results confirmed that in the condition without a vest, the air temperature of 32°C compared to the air temperature of 24°C had a greater effect in increasing the tympanic body temperature (P<0.05). The significant effect of using nanofiber vests along with PCM packages was observed in reducing skin temperature, tympanic temperature, and oral temperature in hot temperature conditions with effect sizes of 0.498, 0.568, and 0.349, respectively (P<0.05). The effect size of increasing the air temperature was lower than that of the type of cooling vests on the physiological responses, indicating that the effectiveness of the designed vests is enhanced with an increase in temperature (P<0.05).
Conclusion: The use of nanofiber cooling vests and PCM packages is effective in maintaining the body temperature stability of medical personnel in hot environments due to ideal weight and acceptable effect size.
