Pub Date : 2022-01-22DOI: 10.18502/ijoh.v13i4.8429
F. Golbabaei, Akbar Ahmadi Asour, Sepideh Keyvani, Malihe Kolahdouzi, Mahdi Mohammadiyan, fatemeh fasih ramandi
The Wet Bulb Globe Temperature (WBGT) is still widely applied as a preliminary tool for evaluating heat stress. This index faces some limitations not considered yet. This systematic review was conducted aiming at highlighting some limitations for the development of the WBGT index. The present study was organized using more extensive databases, including PubMed, Google Scholar, Scientific Information Databases (SID), Elsevier, Web of Science, Scopus, Irandoc, Magiran, and Iran Medex. The used search terms were WBGT index, Heat stress, Thermal Stress, Heat strain, Wet Bulb Globe Temperature, Hot Condition, Occupational Health, and Occupational Exposure indices. In this study, 69 articles from the years 1950 to December 2021 were assessed. The WBGT index, despite having some advantages, suffers limitations that should be considered for a more accurate estimate of thermal stress. This study was pointed to the new limitations, including the value of WBGT is not clear for persons whose working in a seated posture. The additional problem with the use of this index was that it was used for adapted people who have consumed enough water and salt, while neither water nor salt is always readily available in most hot working environments. Therefore, using this index will cause an error. Also, in heterogeneous environments, if the heat source is near the head or legs, a coefficient will not be applied to these regions. The results of the study demonstrated that, because of the limitations of the WBGT index, it is recommended that this index be used along with other indicators and physiological parameters to assess heat stress until more extensive studies would be conducted in an attempt to improve and remove its limitations.
湿球温度(WBGT)作为评价热应力的初步工具仍被广泛应用。该指数面临一些尚未考虑到的限制。本系统综述旨在突出WBGT指数发展的一些局限性。本研究使用更广泛的数据库组织，包括PubMed、谷歌Scholar、科学信息数据库(SID)、Elsevier、Web of Science、Scopus、Irandoc、Magiran和Iran Medex。使用的搜索词是WBGT指数、热应力、热应力、热应变、湿球温度、热条件、职业健康和职业暴露指数。在这项研究中，从1950年到2021年12月的69篇文章被评估。WBGT指数，尽管有一些优点，也有局限性，应该考虑更准确地估计热应力。本研究指出了新的局限性，包括WBGT对坐着工作的人的价值尚不清楚。使用这个指数的另一个问题是，它是用于那些已经消耗了足够的水和盐的适应人群，而在大多数炎热的工作环境中，水和盐都不是随时可用的。因此，使用该索引将导致错误。此外，在非均匀环境中，如果热源靠近头部或腿部，则不会对这些区域施加系数。研究结果表明，由于WBGT指数的局限性，建议在进行更广泛的研究以改进和消除其局限性之前，将该指数与其他指标和生理参数一起用于评估热应激。
{"title":"Limitations of WBGT Index for Application in Industries: A Systematic Review","authors":"F. Golbabaei, Akbar Ahmadi Asour, Sepideh Keyvani, Malihe Kolahdouzi, Mahdi Mohammadiyan, fatemeh fasih ramandi","doi":"10.18502/ijoh.v13i4.8429","DOIUrl":"https://doi.org/10.18502/ijoh.v13i4.8429","url":null,"abstract":"The Wet Bulb Globe Temperature (WBGT) is still widely applied as a preliminary tool for evaluating heat stress. This index faces some limitations not considered yet. This systematic review was conducted aiming at highlighting some limitations for the development of the WBGT index. The present study was organized using more extensive databases, including PubMed, Google Scholar, Scientific Information Databases (SID), Elsevier, Web of Science, Scopus, Irandoc, Magiran, and Iran Medex. The used search terms were WBGT index, Heat stress, Thermal Stress, Heat strain, Wet Bulb Globe Temperature, Hot Condition, Occupational Health, and Occupational Exposure indices. In this study, 69 articles from the years 1950 to December 2021 were assessed. The WBGT index, despite having some advantages, suffers limitations that should be considered for a more accurate estimate of thermal stress. This study was pointed to the new limitations, including the value of WBGT is not clear for persons whose working in a seated posture. The additional problem with the use of this index was that it was used for adapted people who have consumed enough water and salt, while neither water nor salt is always readily available in most hot working environments. Therefore, using this index will cause an error. Also, in heterogeneous environments, if the heat source is near the head or legs, a coefficient will not be applied to these regions. The results of the study demonstrated that, because of the limitations of the WBGT index, it is recommended that this index be used along with other indicators and physiological parameters to assess heat stress until more extensive studies would be conducted in an attempt to improve and remove its limitations.","PeriodicalId":52667,"journal":{"name":"International Journal of Occupational Hygiene","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48077769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-22DOI: 10.18502/ijoh.v13i4.8430
Elnaz Taheri, FATEMEH DEHGHANI, Negar Safarpour Khotbesara, N. Kurd
Inexpensive and simple microextraction methods with high efficiency are highly recognized approaches for sample preparation in the analysis of pollutant compounds. Therefore, the present study was aimed to review the studies conducted by Iranian researchers on the use of microextraction methods to determine the occupational analytes from the urine sample. In the current review study, we used keywords, including microextraction, determine, extract, analytes, and urine samples among published articles by Iranian researchers from 2000 to 2019 in databases of Google Scholar, ISC, SID, Magiran, Web of Science, ScienceDirect, PubMed, and Scopus. Then, the extracted articles during the past 20 years were categorized and analyzed according to the title, author name, publication year, study method, study type, and evaluation results. The results of reviewing the selected articles were discussed in terms of several topics. They included optimization of affecting factors method efficiency and extraction efficiency, optimization of parameters affecting extraction performance, application of the optimized method for real samples, and comparison of the proposed method with other procedures. The developed methods in the selected articles were found to be fast, simple, with minimum solvent consumption, short extraction time, and environmentally friendly that can be used as alternatives to conventional methods.
廉价、简单、高效的微萃取方法是污染物分析中得到广泛认可的样品制备方法。因此，本研究的目的是审查伊朗研究人员关于使用微萃取方法从尿液样本中确定职业分析物的研究。在当前的综述研究中，我们在谷歌Scholar、ISC、SID、Magiran、Web of Science、ScienceDirect、PubMed和Scopus数据库中2000年至2019年伊朗研究人员发表的文章中使用了关键词，包括微提取、确定、提取、分析和尿液样本。然后，根据题目、作者姓名、发表年份、研究方法、研究类型、评价结果对近20年来提取的文章进行分类分析。对所选文章的审查结果进行了几个主题的讨论。包括影响因素、方法效率和提取效率的优化，影响提取性能的参数的优化，优化方法在实际样品中的应用，以及与其他方法的比较。结果表明，所建立的方法快速、简便、溶剂用量少、提取时间短、环境友好，可作为传统方法的替代。
{"title":"Application of Microextraction Methods to Extract and Determine the Occupational Analytes from Urine Samples: A Brief Review","authors":"Elnaz Taheri, FATEMEH DEHGHANI, Negar Safarpour Khotbesara, N. Kurd","doi":"10.18502/ijoh.v13i4.8430","DOIUrl":"https://doi.org/10.18502/ijoh.v13i4.8430","url":null,"abstract":"Inexpensive and simple microextraction methods with high efficiency are highly recognized approaches for sample preparation in the analysis of pollutant compounds. Therefore, the present study was aimed to review the studies conducted by Iranian researchers on the use of microextraction methods to determine the occupational analytes from the urine sample. In the current review study, we used keywords, including microextraction, determine, extract, analytes, and urine samples among published articles by Iranian researchers from 2000 to 2019 in databases of Google Scholar, ISC, SID, Magiran, Web of Science, ScienceDirect, PubMed, and Scopus. Then, the extracted articles during the past 20 years were categorized and analyzed according to the title, author name, publication year, study method, study type, and evaluation results. The results of reviewing the selected articles were discussed in terms of several topics. They included optimization of affecting factors method efficiency and extraction efficiency, optimization of parameters affecting extraction performance, application of the optimized method for real samples, and comparison of the proposed method with other procedures. The developed methods in the selected articles were found to be fast, simple, with minimum solvent consumption, short extraction time, and environmentally friendly that can be used as alternatives to conventional methods.","PeriodicalId":52667,"journal":{"name":"International Journal of Occupational Hygiene","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41779782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-22DOI: 10.18502/ijoh.v13i4.8425
M. HELMI-KOHNESHAHRI, Z. Kazemi, Reza Fazli, M. Pourhossein, A. Mazloumi
Nowadays, musculoskeletal disorders resulting from working with improper hand tools have been known as one of the major concerns in various industries. In the current study, an ergonomic nail removal device was proposed to evaluate the intervention for nail removal activity in the woodworking and carpentry industry. Eleven male workers, who were actively involved in nail removing activity, were asked to perform nailing activity by removing nails driven into the bottom and top of the door as the base points for painting the doors using both the nail removal device and the traditional plier. The Rapid Entire Body Assessment (REBA) and Strain Index (SI) techniques were used to characterize the level of risk. Moreover, nailing task duration and task repetition were measured as important criteria in manual works. According to the SI and REBA risk indices, the final scores for the designed device were estimated at 2 (low-risk level) and 1.5 (safe), respectively, while these values for the traditional pliers were 12 (high-risk level) and 15 (dangerous). Moreover, using the designed electric nail removal device led to a reduction in the repetition and duration of the task. Overall, the application of the proposed device in the nail removal tasks has shown risk indices below the critical thresholds in terms of correcting work posture and reducing strains imposed on workers' upper limbs.
{"title":"Ergonomic Design and Evaluation of an Electric Nail Removal Device","authors":"M. HELMI-KOHNESHAHRI, Z. Kazemi, Reza Fazli, M. Pourhossein, A. Mazloumi","doi":"10.18502/ijoh.v13i4.8425","DOIUrl":"https://doi.org/10.18502/ijoh.v13i4.8425","url":null,"abstract":"Nowadays, musculoskeletal disorders resulting from working with improper hand tools have been known as one of the major concerns in various industries. In the current study, an ergonomic nail removal device was proposed to evaluate the intervention for nail removal activity in the woodworking and carpentry industry. Eleven male workers, who were actively involved in nail removing activity, were asked to perform nailing activity by removing nails driven into the bottom and top of the door as the base points for painting the doors using both the nail removal device and the traditional plier. The Rapid Entire Body Assessment (REBA) and Strain Index (SI) techniques were used to characterize the level of risk. Moreover, nailing task duration and task repetition were measured as important criteria in manual works. According to the SI and REBA risk indices, the final scores for the designed device were estimated at 2 (low-risk level) and 1.5 (safe), respectively, while these values for the traditional pliers were 12 (high-risk level) and 15 (dangerous). Moreover, using the designed electric nail removal device led to a reduction in the repetition and duration of the task. Overall, the application of the proposed device in the nail removal tasks has shown risk indices below the critical thresholds in terms of correcting work posture and reducing strains imposed on workers' upper limbs.","PeriodicalId":52667,"journal":{"name":"International Journal of Occupational Hygiene","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44864472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-22DOI: 10.18502/ijoh.v13i4.8427
Nora MAHMOOD ALJUNAID, Amal S. Alzahrani, Amal AHMED HEGAZY, Khaled ABDULRAHMAN ALTASSAN
Carpal tunnel syndrome (CTS) is a common peripheral compression neuropathy that accounts for 90% of all entrapment neuropathies. Dentists typically have a higher prevalence of work-related musculoskeletal disorders including CTS. Currently, there is a lack of literature on CTS prevalence and risk factors among dentistry in Saudi Arabia. Our study was the first to examine the prevalence and the associated demographic and occupational factors of CTS among dental students. This cross-sectional study was conducted in the School of Dentistry at King Abdulaziz University. A total of 120 dental students in their final year were included. We used a validated self-administered questionnaire that included demographic data, work, medical history, and a modified Katz's hand diagram to assess the symptoms and occupational exposures. Descriptive statistics and logistic regression were applied using SPSS software version 16. The prevalence of CTS among dental students was 13.3%. It was higher in females 10% compared to male 3.3%. There was a significant relationship between the body mass index (P= 0.03) with underweight category by having a higher prevalence of CTS. The use of finger pinch grip showed an inverse association with CTS (P=0.04). Other risk factors were not significantly associated with CTS. The prevalence of CTS among dental students was higher than the general population. However, many previously identified risk factors showed no significant association with CTS adding to the controversy of the contributing risk factors of this disease among dentistry. Finger pinch grip showed inverse association which was contrary to published literature. Future studies may include exposure time for each occupational risk factor preferably in a prospective cohort.
{"title":"Demographic and Occupational Risk Factors of Carpal Tunnel Syndrome among Dental students in their Final Year at King Abdulaziz University, Jeddah, Saudi Arabia","authors":"Nora MAHMOOD ALJUNAID, Amal S. Alzahrani, Amal AHMED HEGAZY, Khaled ABDULRAHMAN ALTASSAN","doi":"10.18502/ijoh.v13i4.8427","DOIUrl":"https://doi.org/10.18502/ijoh.v13i4.8427","url":null,"abstract":"Carpal tunnel syndrome (CTS) is a common peripheral compression neuropathy that accounts for 90% of all entrapment neuropathies. Dentists typically have a higher prevalence of work-related musculoskeletal disorders including CTS. Currently, there is a lack of literature on CTS prevalence and risk factors among dentistry in Saudi Arabia. Our study was the first to examine the prevalence and the associated demographic and occupational factors of CTS among dental students. This cross-sectional study was conducted in the School of Dentistry at King Abdulaziz University. A total of 120 dental students in their final year were included. We used a validated self-administered questionnaire that included demographic data, work, medical history, and a modified Katz's hand diagram to assess the symptoms and occupational exposures. Descriptive statistics and logistic regression were applied using SPSS software version 16. The prevalence of CTS among dental students was 13.3%. It was higher in females 10% compared to male 3.3%. There was a significant relationship between the body mass index (P= 0.03) with underweight category by having a higher prevalence of CTS. The use of finger pinch grip showed an inverse association with CTS (P=0.04). Other risk factors were not significantly associated with CTS. The prevalence of CTS among dental students was higher than the general population. However, many previously identified risk factors showed no significant association with CTS adding to the controversy of the contributing risk factors of this disease among dentistry. Finger pinch grip showed inverse association which was contrary to published literature. Future studies may include exposure time for each occupational risk factor preferably in a prospective cohort.","PeriodicalId":52667,"journal":{"name":"International Journal of Occupational Hygiene","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43870818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-22DOI: 10.18502/ijoh.v13i4.8428
Saadollah Andishe, Mohammad Jafari, fatemeh fasih ramandi, S. Khodakarim, A. Salehi
The psychometrics of instruments in safety performance evaluation is essential for the accreditation of an organization’s safety evaluation and has been emphasized in many studies. Psychometrics pertains to the validity and reliability of an evaluation instrument and describes its precision and consistency. The aim of the present study was to evaluate the psychometrics of safety level and safety culture questionnaires to provide a reliable and valid instrument for safety performance evaluation in industries. This descriptive cross sectional study was conducted with the intention of psychometric instruments used to evaluate the safety level and the safety climate at the Mapna Pars power plant generator manufacturing and engineering company. The face validity of the questionnaires was analyzed quantitatively and qualitatively. In the quantitative method, the importance of the influence score was applied and the content validity was calculated using the Lawshe method. Content Validity Ratio (CVR) and Content Validity Index (CVI) were also used. For this purpose, elicitation was obtained from experts within the professional health and safety community. The reliability of the instruments was determined via the Cronbach's alpha test and the Interclass Correlation Coefficient (ICC) test. Finally, the standardized questionnaires were used to evaluate the safety level and safety climate of the industry as a case study. The obtained data were analyzed using SPSS software solution v20. Based on the quantitative face validity results obtained at the Mapna Pars Company, one question was removed from each of the final instruments. The content reliability analysis revealed that the safety level questionnaire had a CRI of 0.99, CVR of 0.91, and was accepted. The safety climate questionnaire had an acceptable CVI of 0.95 and an acceptable CVR of 0.82. Regarding the reliability analysis, a Cronbach's alpha of 0.72 and 0.89 was obtained for the safety level questionnaire and the safety climate questionnaire, respectively. It can be concluded that both questionnaires had an acceptable level of internal consistency. The re-application of the questionnaires after two weeks revealed a relatively consistent safety level (ICC=0.90) and safety climate (ICC=0.74). Analyzing the data obtained in the present study showed that the safety level questionnaire with 66 questions and the safety climate questionnaire with 93 questions had acceptable validity and reliability. Thus, it may provide a useful approach for safety evaluations in similar industries.
{"title":"Psychometrics of Questionnaires Designed for the Evaluation of Safety Levels and Safety Culture Case Study: Power Plant Generator Manufacturing Company","authors":"Saadollah Andishe, Mohammad Jafari, fatemeh fasih ramandi, S. Khodakarim, A. Salehi","doi":"10.18502/ijoh.v13i4.8428","DOIUrl":"https://doi.org/10.18502/ijoh.v13i4.8428","url":null,"abstract":"The psychometrics of instruments in safety performance evaluation is essential for the accreditation of an organization’s safety evaluation and has been emphasized in many studies. Psychometrics pertains to the validity and reliability of an evaluation instrument and describes its precision and consistency. The aim of the present study was to evaluate the psychometrics of safety level and safety culture questionnaires to provide a reliable and valid instrument for safety performance evaluation in industries. This descriptive cross sectional study was conducted with the intention of psychometric instruments used to evaluate the safety level and the safety climate at the Mapna Pars power plant generator manufacturing and engineering company. The face validity of the questionnaires was analyzed quantitatively and qualitatively. In the quantitative method, the importance of the influence score was applied and the content validity was calculated using the Lawshe method. Content Validity Ratio (CVR) and Content Validity Index (CVI) were also used. For this purpose, elicitation was obtained from experts within the professional health and safety community. The reliability of the instruments was determined via the Cronbach's alpha test and the Interclass Correlation Coefficient (ICC) test. Finally, the standardized questionnaires were used to evaluate the safety level and safety climate of the industry as a case study. The obtained data were analyzed using SPSS software solution v20. Based on the quantitative face validity results obtained at the Mapna Pars Company, one question was removed from each of the final instruments. The content reliability analysis revealed that the safety level questionnaire had a CRI of 0.99, CVR of 0.91, and was accepted. The safety climate questionnaire had an acceptable CVI of 0.95 and an acceptable CVR of 0.82. Regarding the reliability analysis, a Cronbach's alpha of 0.72 and 0.89 was obtained for the safety level questionnaire and the safety climate questionnaire, respectively. It can be concluded that both questionnaires had an acceptable level of internal consistency. The re-application of the questionnaires after two weeks revealed a relatively consistent safety level (ICC=0.90) and safety climate (ICC=0.74). Analyzing the data obtained in the present study showed that the safety level questionnaire with 66 questions and the safety climate questionnaire with 93 questions had acceptable validity and reliability. Thus, it may provide a useful approach for safety evaluations in similar industries.","PeriodicalId":52667,"journal":{"name":"International Journal of Occupational Hygiene","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49532606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-22DOI: 10.18502/ijoh.v13i4.8426
A. Dehdashti, Adel Malekmohamadi, Gholamreza Ghaeini
Sound absorbing materials have been widely used to decrease hazardous noise in indoor and outdoor environments. In the present study, we designed and constructed an experimental laboratory-scale chamber to measure the sound absorption coefficients of porous materials in comparison with the measurements of the test tube method. The main reason was to design and construct a small chamber to enable testing of acoustic material samples in small dimensions allowing easy and rapid testing of acoustic materials. The acoustic chamber method was based on the formation of reverberation field of the acoustic waves across testing chamber locations, but differences in sound pressure throughout the chamber may result in measurement errors. Therefore, the chamber was constructed with a volume of 2.85 m3, wall reflectors, and a rotating sound source was designed to ensure a diffusive field. The tests were conducted with samples of 12.4m2 installed on interior surfaces of the chamber. Sound absorption coefficients of acoustic polyethylene and polyurethane absorbents were measured across the central frequencies of the octave band. Sound absorption coefficients under reverberant random incidence and normal incidence were related to the sound frequency. The chamber method predicted higher sound absorption coefficients compared to the coefficients obtained by the tube test method for all tested porous materials. Based on the results of the proposed small chamber, it can be concluded that sound absorption coefficients measurement of samples in an environment was more similar to real situations.
{"title":"Determining and Comparison of Sound Absorption Coefficients using Small Reverberation Chamber and Test Tube Methods","authors":"A. Dehdashti, Adel Malekmohamadi, Gholamreza Ghaeini","doi":"10.18502/ijoh.v13i4.8426","DOIUrl":"https://doi.org/10.18502/ijoh.v13i4.8426","url":null,"abstract":"Sound absorbing materials have been widely used to decrease hazardous noise in indoor and outdoor environments. In the present study, we designed and constructed an experimental laboratory-scale chamber to measure the sound absorption coefficients of porous materials in comparison with the measurements of the test tube method. The main reason was to design and construct a small chamber to enable testing of acoustic material samples in small dimensions allowing easy and rapid testing of acoustic materials. The acoustic chamber method was based on the formation of reverberation field of the acoustic waves across testing chamber locations, but differences in sound pressure throughout the chamber may result in measurement errors. Therefore, the chamber was constructed with a volume of 2.85 m3, wall reflectors, and a rotating sound source was designed to ensure a diffusive field. The tests were conducted with samples of 12.4m2 installed on interior surfaces of the chamber. Sound absorption coefficients of acoustic polyethylene and polyurethane absorbents were measured across the central frequencies of the octave band. Sound absorption coefficients under reverberant random incidence and normal incidence were related to the sound frequency. The chamber method predicted higher sound absorption coefficients compared to the coefficients obtained by the tube test method for all tested porous materials. Based on the results of the proposed small chamber, it can be concluded that sound absorption coefficients measurement of samples in an environment was more similar to real situations. \u0000 ","PeriodicalId":52667,"journal":{"name":"International Journal of Occupational Hygiene","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41280422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-19DOI: 10.18502/ijoh.v13i4.8422
A. Bolandian, I. Alimohammadi, B. Forough
There are several risk factors in dentistry that among them repetitive movements, being in a position for a long time due to muscle imbalances, and work-related musculoskeletal disorders which can cause problems such as limited mobility, fatigue, job loss or even changing jobs. Muscle imbalance between the stabilizers and mobilizers of the neck and shoulders in dentists leads to increased work-related disorders, superficial muscle fatigue, and deep muscle atrophy, which in turn, leads to many health problems such as neck pain and disability. To prevent such disorders, a high endurance of the cervical stabilizer muscles is essential for repetitive movements in the distal and shoulder region. In this study, the exercise program, including postural exercises, simultaneous training of shoulder-neck, scapular movements, and co-contraction were designed for 48 dentists. The statistical analysis showed that there was a significant decrease in the median frequency slope of the middle deltoid muscle (p = 0.004) and for the group who received the proprioception training along with posture correction exercises and exercise therapy (p = 0.004). Neck pain increased in the control group who received no exercises, after six weeks (p = 0.165). Six weeks of corrective exercises with ergonomic intervention balance muscles activity and can be used to decrease musculoskeletal disorders and muscle fatigue in person with Non-Specific Chronic Neck Pain.
{"title":"Effect of Proprioceptive Exercises along with Ergonomic Intervention on Middle Deltoid and Serratus Anterior Fatigue in Dentists with Non-Specific Chronic Neck Pain","authors":"A. Bolandian, I. Alimohammadi, B. Forough","doi":"10.18502/ijoh.v13i4.8422","DOIUrl":"https://doi.org/10.18502/ijoh.v13i4.8422","url":null,"abstract":"There are several risk factors in dentistry that among them repetitive movements, being in a position for a long time due to muscle imbalances, and work-related musculoskeletal disorders which can cause problems such as limited mobility, fatigue, job loss or even changing jobs. Muscle imbalance between the stabilizers and mobilizers of the neck and shoulders in dentists leads to increased work-related disorders, superficial muscle fatigue, and deep muscle atrophy, which in turn, leads to many health problems such as neck pain and disability. To prevent such disorders, a high endurance of the cervical stabilizer muscles is essential for repetitive movements in the distal and shoulder region. In this study, the exercise program, including postural exercises, simultaneous training of shoulder-neck, scapular movements, and co-contraction were designed for 48 dentists. The statistical analysis showed that there was a significant decrease in the median frequency slope of the middle deltoid muscle (p = 0.004) and for the group who received the proprioception training along with posture correction exercises and exercise therapy (p = 0.004). Neck pain increased in the control group who received no exercises, after six weeks (p = 0.165). Six weeks of corrective exercises with ergonomic intervention balance muscles activity and can be used to decrease musculoskeletal disorders and muscle fatigue in person with Non-Specific Chronic Neck Pain.","PeriodicalId":52667,"journal":{"name":"International Journal of Occupational Hygiene","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48886003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-19DOI: 10.18502/ijoh.v13i3.8421
R. Jafari Nodoushan, R. Pirouzeh, V. Anoosheh, Saeideh Taherzadeh
Despite all the positive effects of cell phones on communication, the improper use of these devices may lead to fatigue and many other problems, including academic, physical, and social problems. Among different age groups, students are the most affected due to the importance of cell phones in their educational and communications needs. In this study, we seek to investigate the relationship between improper use of cell phones and fatigue in Iranian medical students. In the present descriptive-analytical and cross-sectional study, 400 students were randomly selected from the Iran University of Medical Sciences by cluster sampling. Data collection tools included demographic information questionnaires, harmful cell phone use (COS), and fatigue (Smets). Data were analyzed using SPSS software version 22 based on the frequency tests, mean, standard deviation, and ANOVA with a significance level of 0.05. The mean age of students was 24.1±5.65. The total population of the study was 56% female and 44%, male. The results revealed that the prevalence of fatigue among students was moderate (56.60%). The status of harmful cell phone use was reported to be moderate (90%). There was a significant relationship between mobile phone use and total fatigue (p=0.029), decreased motivation (p=0.025), and mental fatigue (p = 0.001). Results showed that excessive use of cell phones had an adverse impact on total fatigue, mental fatigue, and motivation. Therefore, it is recommended to design effective interventions to prevent harmful use of cell-phone, student fatigue, and other consequences, including academic failure and reduction of mental health.
{"title":"Investigating the Impact of Cell-Phone on Fatigue: A Case Study of Iranian Medical Students","authors":"R. Jafari Nodoushan, R. Pirouzeh, V. Anoosheh, Saeideh Taherzadeh","doi":"10.18502/ijoh.v13i3.8421","DOIUrl":"https://doi.org/10.18502/ijoh.v13i3.8421","url":null,"abstract":"Despite all the positive effects of cell phones on communication, the improper use of these devices may lead to fatigue and many other problems, including academic, physical, and social problems. Among different age groups, students are the most affected due to the importance of cell phones in their educational and communications needs. In this study, we seek to investigate the relationship between improper use of cell phones and fatigue in Iranian medical students. In the present descriptive-analytical and cross-sectional study, 400 students were randomly selected from the Iran University of Medical Sciences by cluster sampling. Data collection tools included demographic information questionnaires, harmful cell phone use (COS), and fatigue (Smets). Data were analyzed using SPSS software version 22 based on the frequency tests, mean, standard deviation, and ANOVA with a significance level of 0.05. The mean age of students was 24.1±5.65. The total population of the study was 56% female and 44%, male. The results revealed that the prevalence of fatigue among students was moderate (56.60%). The status of harmful cell phone use was reported to be moderate (90%). There was a significant relationship between mobile phone use and total fatigue (p=0.029), decreased motivation (p=0.025), and mental fatigue (p = 0.001). Results showed that excessive use of cell phones had an adverse impact on total fatigue, mental fatigue, and motivation. Therefore, it is recommended to design effective interventions to prevent harmful use of cell-phone, student fatigue, and other consequences, including academic failure and reduction of mental health.","PeriodicalId":52667,"journal":{"name":"International Journal of Occupational Hygiene","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49342340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-19DOI: 10.18502/ijoh.v13i3.8415
Leshan J Kimbrough
The jarless cyclone calibration method is an appealing approach because it removes the need for calibration adapters and eliminates potential sources of error that result from poor or inconsistent seals in calibration adapters or calibration jar lids. The aim of this study was to perform a detailed review of the jarless calibration method by (1) examining the rationale behind the initial pressure drop range specified by the method and (2) evaluating the accuracy of the method in contrast to flow rate measurements in a well-controlled, jar protocol. Four types of respirable cyclones and two filter brands with samples from three separate production lots were considered as components of the sampling trains under consideration. Volumetric flow rate and pressure drop were measured under controlled conditions in a cylindrical jar designed for these determinations. The initial challenge pressure range evaluated in this study was modified based on cyclone type. The measured pressure drop fell within the modified range for all configurations considered, indicating the modified ranges were appropriate. The accuracy of the jarless method was then evaluated by comparing measured volumetric flow rates using different calibration methods for various cyclone, filter brand, and filter lot combination. The jarless method provided accurate calibration results utilizing the modified initial pressure drop ranges utilized in this study. Therefore, it is recommended the initial pressure drop range specified by the jarless method be modified to account for differences among cyclone types.
{"title":"Evaluation of the Jarless Method for Cyclone Calibration in Occupational Air Sampling","authors":"Leshan J Kimbrough","doi":"10.18502/ijoh.v13i3.8415","DOIUrl":"https://doi.org/10.18502/ijoh.v13i3.8415","url":null,"abstract":"The jarless cyclone calibration method is an appealing approach because it removes the need for calibration adapters and eliminates potential sources of error that result from poor or inconsistent seals in calibration adapters or calibration jar lids. The aim of this study was to perform a detailed review of the jarless calibration method by (1) examining the rationale behind the initial pressure drop range specified by the method and (2) evaluating the accuracy of the method in contrast to flow rate measurements in a well-controlled, jar protocol. Four types of respirable cyclones and two filter brands with samples from three separate production lots were considered as components of the sampling trains under consideration. Volumetric flow rate and pressure drop were measured under controlled conditions in a cylindrical jar designed for these determinations. The initial challenge pressure range evaluated in this study was modified based on cyclone type. The measured pressure drop fell within the modified range for all configurations considered, indicating the modified ranges were appropriate. The accuracy of the jarless method was then evaluated by comparing measured volumetric flow rates using different calibration methods for various cyclone, filter brand, and filter lot combination. The jarless method provided accurate calibration results utilizing the modified initial pressure drop ranges utilized in this study. Therefore, it is recommended the initial pressure drop range specified by the jarless method be modified to account for differences among cyclone types.","PeriodicalId":52667,"journal":{"name":"International Journal of Occupational Hygiene","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44200206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-19DOI: 10.18502/ijoh.v13i3.8418
S. Mehdi
The human being is the noblest of all the creations by Allah Rabbul-Izzat. Allah gave special commands to humans which made differences over other species, the hygiene practice is one of them. The researches on toilets, defecation, urination and self-cleansing may be supposed as unthinkable subjects in daily discussions, but these topics are important for health and hygiene perspectives. Designers and manufacturers are busy making aesthetically attractive, ergonomically and anthropometrically defined toilet seats. But there is a need for some adjustments in the size and design of modern toilet seats as per the hygiene perspective. This paper presents a conceptual design framework aimed, increasing the level of hygiene and introduced the three-dimensional designs of sitting and squatting types of toilet seats with some amendments as compared to modern designs, concerning hygiene perspective. The present conceptual design of toilet seats can become the integration of human hygiene practice. In this study, Solidworks Designing Software was used for three-dimensional designs. This framework study dedicates to Iranian society.
{"title":"Conceptual Framework of Toilet Seats Design from Hygiene Perspective for the Society of the ‘Islamic Republic of Iran’","authors":"S. Mehdi","doi":"10.18502/ijoh.v13i3.8418","DOIUrl":"https://doi.org/10.18502/ijoh.v13i3.8418","url":null,"abstract":"The human being is the noblest of all the creations by Allah Rabbul-Izzat. Allah gave special commands to humans which made differences over other species, the hygiene practice is one of them. The researches on toilets, defecation, urination and self-cleansing may be supposed as unthinkable subjects in daily discussions, but these topics are important for health and hygiene perspectives. Designers and manufacturers are busy making aesthetically attractive, ergonomically and anthropometrically defined toilet seats. But there is a need for some adjustments in the size and design of modern toilet seats as per the hygiene perspective. This paper presents a conceptual design framework aimed, increasing the level of hygiene and introduced the three-dimensional designs of sitting and squatting types of toilet seats with some amendments as compared to modern designs, concerning hygiene perspective. The present conceptual design of toilet seats can become the integration of human hygiene practice. In this study, Solidworks Designing Software was used for three-dimensional designs. This framework study dedicates to Iranian society. \u0000 ","PeriodicalId":52667,"journal":{"name":"International Journal of Occupational Hygiene","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47326073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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