The Experts below are selected from a list of 10194 Experts worldwide ranked by ideXlab platform
Houshang Shahnavaz - One of the best experts on this subject based on the ideXlab platform.
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musculoskeletal problems in iranian hand woven carpet industry guidelines for Workstation Design
Applied Ergonomics, 2007Co-Authors: Alireza Choobineh, Mostafa Hosseini, Mohammadali Lahmi, Reza Khani Jazani, Houshang ShahnavazAbstract:Abstract Long hours of static work with awkward posture at traditionally Designed looms can cause high prevalence of musculoskeletal disorders (MSDs) among carpet weavers. A comprehensive study was conducted in this industry with the objectives of determination of MSDs symptoms prevalence; identification of major factors associated with MSDs symptoms in carpet weaving occupation; and development of guidelines for weaving Workstation Design. In the present paper, this ergonomics study is presented. The study consisted of two phases. In the first phase, MSDs symptoms in nine Iranian provinces were surveyed by questionnaire among 1439 randomly selected weavers. Working posture and weaving Workstations were ergonomically assessed as well. The results of this phase revealed that symptoms from the musculoskeletal system occured in high rate among weavers with the prevalence significantly higher than that of the general Iranian population ( P 0.001 ). It was found that the majority of ergonomics shortcomings originated from ill-Designed weaving Workstation. Based on the findings, some general guidelines for Workstation Design were presented. In the second phase, considering the general guidelines, an adjustable Workstation was Designed and constructed. To develop quantitative guidlenes for optimizing Workstation set-up, in the laboratory, nine sets of experimental conditions were tested, and working posture and weavers’ perceptions were measured. The results of this lab work showed that working posture was acceptable for both the researchers and the weavers when the weaving height was adjusted 20 cm above the elbow height and a high seat with forward slope was used. By combining the results of the two phases, guidelines for weaving Workstation Design were presented. In this ergonomics-oriented Workstation, loom is vertical. Seat, loom and weaving heights are adjustable. There is enough leg room under the loom. The seat with 10° forward slope is adjusted 15 cm above the popliteal height of the weaver. Weaving height is set at 20 cm above the elbow height. It is believed that the recommended Workstation improves working posture and results in reduced postural stress on weavers’ bodies and, consequently, reduced prevalence of MSDs symptoms.
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musculoskeletal symptoms as related to ergonomic factors in iranian hand woven carpet industry and general guidelines for Workstation Design
International Journal of Occupational Safety and Ergonomics, 2004Co-Authors: Alireza Choobineh, Mohammadali Lahmi, Reza Khani Jazani, Houshang Shahnavaz, Mostafa HosseiniAbstract:Carpet weaving is a high risk occupation for developing musculoskeletal disorders (MSDs). The objectives of the present study, which was carried out in the Iranian hand-woven carpet industry, were determination of the prevalence of MSD symptoms, identification of major factors associated with MSD symptoms and development of guidelines for Workstation Design. 1,439 randomly selected weavers participated in this study. A questionnaire was used to collect data on MSD symptoms. The results revealed that the prevalence rates for symptoms in different body regions were high as compared to the general Iranian population (for neck, back and large joints, p < .0001). The results of multivariate analyses showed that major ergonomic factors associated with musculoskeletal symptoms were loom type, working posture, daily working time and seat type. Based on the results, some general guidelines for Designing weaving Workstations were developed. A prototype test showed that the new Workstation was acceptable for subject tests and that it improved working posture. MSDs in small-scale industries posture assessment in carpet hand weaving operation MSDs in industrially developing countries (IDCs) weaving Workstation Design
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Workstation Design in carpet hand weaving operation guidelines for prevention of musculoskeletal disorders
International Journal of Occupational Safety and Ergonomics, 2004Co-Authors: Alireza Choobineh, Mostafa Hosseini, Mohammadali Lahmi, Houshang Shahnavaz, Reza Khani JazaniAbstract:Carpet weavers suffer from musculoskeletal problems mainly attributed to poor working postures. Their posture is mostly constrained by the Design of Workstations. This study was conducted to investigate the effects of 2 Design parameters (weaving height and seat type) on postural variables and subjective experience, and to develop guidelines for Workstation adjustments. At an experimental Workstation, 30 professional weavers worked in 9 different conditions. Working posture and weavers’ perceptions were measured. It was shown that head, neck and shoulder postures were influenced by weaving height. Both Design parameters influenced trunk and elbows postures. The determinant factor for weavers’ perception on the neck, shoulders and elbows was found to be weaving height, and on the back and knees it was seat type. Based on the results, the following guidelines were developed: (a) weaving height should be adjusted to 20 cm above elbow height; (b) a 10o forward-sloping high seat is to be used at weaving Workstations. weaving Workstation Design carpet hand-weaving operation musculoskeletal problems, working posture
Alireza Choobineh - One of the best experts on this subject based on the ideXlab platform.
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musculoskeletal problems in iranian hand woven shoe sole making operation and developing guidelines for Workstation Design
The international journal of occupational and environmental medicine, 2016Co-Authors: Hemmat Veisi, Alireza Choobineh, Haleh GhaemAbstract:Background: Musculoskeletal disorders (MSDs) are among important health problems in working population. Because of performing difficult physical activities, hand-woven shoe-sole makers are at risk of developing various types of MSDs. Objective: To determine the prevalence of musculoskeletal symptoms in different body areas of hand-woven shoe-sole makers, assess workers′ postures and Workstations, evaluate ergonomic and individual factors associated with MSDs, and develop guidelines for Designing hand-woven shoe-sole making Workstation. Methods: In this cross-sectional study, the prevalence of MSDs symptoms and their risk factors were studied among 240 hand-woven shoe-sole makers. Working posture and Workstations were ergonomically assessed as well. The data were collected through interviewing and using Nordic musculoskeletal questionnaire and by direct observation of posture using RULA method. Logistic regression analysis was used to determine risk factors associated with MSDs symptoms. Results: The prevalence and severity of MSDs symptoms were high among the study population. Ergonomic factors including daily working time, working posture, and force exertion, as well as individual factors, such as age, job tenure, and education were significantly associated with MSDs symptoms. Conclusion: It seems that the majority of ergonomics shortcomings originate from poorly Designed Workstation. Some general guidelines for Designing shoe-sole making Workstation are presented.
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musculoskeletal problems in iranian hand woven carpet industry guidelines for Workstation Design
Applied Ergonomics, 2007Co-Authors: Alireza Choobineh, Mostafa Hosseini, Mohammadali Lahmi, Reza Khani Jazani, Houshang ShahnavazAbstract:Abstract Long hours of static work with awkward posture at traditionally Designed looms can cause high prevalence of musculoskeletal disorders (MSDs) among carpet weavers. A comprehensive study was conducted in this industry with the objectives of determination of MSDs symptoms prevalence; identification of major factors associated with MSDs symptoms in carpet weaving occupation; and development of guidelines for weaving Workstation Design. In the present paper, this ergonomics study is presented. The study consisted of two phases. In the first phase, MSDs symptoms in nine Iranian provinces were surveyed by questionnaire among 1439 randomly selected weavers. Working posture and weaving Workstations were ergonomically assessed as well. The results of this phase revealed that symptoms from the musculoskeletal system occured in high rate among weavers with the prevalence significantly higher than that of the general Iranian population ( P 0.001 ). It was found that the majority of ergonomics shortcomings originated from ill-Designed weaving Workstation. Based on the findings, some general guidelines for Workstation Design were presented. In the second phase, considering the general guidelines, an adjustable Workstation was Designed and constructed. To develop quantitative guidlenes for optimizing Workstation set-up, in the laboratory, nine sets of experimental conditions were tested, and working posture and weavers’ perceptions were measured. The results of this lab work showed that working posture was acceptable for both the researchers and the weavers when the weaving height was adjusted 20 cm above the elbow height and a high seat with forward slope was used. By combining the results of the two phases, guidelines for weaving Workstation Design were presented. In this ergonomics-oriented Workstation, loom is vertical. Seat, loom and weaving heights are adjustable. There is enough leg room under the loom. The seat with 10° forward slope is adjusted 15 cm above the popliteal height of the weaver. Weaving height is set at 20 cm above the elbow height. It is believed that the recommended Workstation improves working posture and results in reduced postural stress on weavers’ bodies and, consequently, reduced prevalence of MSDs symptoms.
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musculoskeletal symptoms as related to ergonomic factors in iranian hand woven carpet industry and general guidelines for Workstation Design
International Journal of Occupational Safety and Ergonomics, 2004Co-Authors: Alireza Choobineh, Mohammadali Lahmi, Reza Khani Jazani, Houshang Shahnavaz, Mostafa HosseiniAbstract:Carpet weaving is a high risk occupation for developing musculoskeletal disorders (MSDs). The objectives of the present study, which was carried out in the Iranian hand-woven carpet industry, were determination of the prevalence of MSD symptoms, identification of major factors associated with MSD symptoms and development of guidelines for Workstation Design. 1,439 randomly selected weavers participated in this study. A questionnaire was used to collect data on MSD symptoms. The results revealed that the prevalence rates for symptoms in different body regions were high as compared to the general Iranian population (for neck, back and large joints, p < .0001). The results of multivariate analyses showed that major ergonomic factors associated with musculoskeletal symptoms were loom type, working posture, daily working time and seat type. Based on the results, some general guidelines for Designing weaving Workstations were developed. A prototype test showed that the new Workstation was acceptable for subject tests and that it improved working posture. MSDs in small-scale industries posture assessment in carpet hand weaving operation MSDs in industrially developing countries (IDCs) weaving Workstation Design
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Workstation Design in carpet hand weaving operation guidelines for prevention of musculoskeletal disorders
International Journal of Occupational Safety and Ergonomics, 2004Co-Authors: Alireza Choobineh, Mostafa Hosseini, Mohammadali Lahmi, Houshang Shahnavaz, Reza Khani JazaniAbstract:Carpet weavers suffer from musculoskeletal problems mainly attributed to poor working postures. Their posture is mostly constrained by the Design of Workstations. This study was conducted to investigate the effects of 2 Design parameters (weaving height and seat type) on postural variables and subjective experience, and to develop guidelines for Workstation adjustments. At an experimental Workstation, 30 professional weavers worked in 9 different conditions. Working posture and weavers’ perceptions were measured. It was shown that head, neck and shoulder postures were influenced by weaving height. Both Design parameters influenced trunk and elbows postures. The determinant factor for weavers’ perception on the neck, shoulders and elbows was found to be weaving height, and on the back and knees it was seat type. Based on the results, the following guidelines were developed: (a) weaving height should be adjusted to 20 cm above elbow height; (b) a 10o forward-sloping high seat is to be used at weaving Workstations. weaving Workstation Design carpet hand-weaving operation musculoskeletal problems, working posture
Arijit K. Sengupta - One of the best experts on this subject based on the ideXlab platform.
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Industrial Workstation Design: A systematic ergonomics approach
Applied Ergonomics, 1996Co-Authors: Biman Das, Arijit K. SenguptaAbstract:For the Design of an industrial Workstation, ergonomics guidelines are presented in a systematic manner. The guidelines provide a conceptual basis for a good Workstation Design. In a real world Design situation, the implementation of the recommendations or guidelines needs the matching of the population anthropometry with the various components of the Workstation. Adequate posture, work height, normal and maximum working areas, lateral clearance and visual requirement are determined for the intended user population. The procedure for determining the Workstation dimensions and layout has been explained. The importance of building a mock-up of the Designed Workstation and its evaluation with representative subjects is emphasized. A case problem (supermarket checkstand Workstation) is discussed to illustrate the Workstation Design procedure.
Mostafa Hosseini - One of the best experts on this subject based on the ideXlab platform.
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musculoskeletal problems in iranian hand woven carpet industry guidelines for Workstation Design
Applied Ergonomics, 2007Co-Authors: Alireza Choobineh, Mostafa Hosseini, Mohammadali Lahmi, Reza Khani Jazani, Houshang ShahnavazAbstract:Abstract Long hours of static work with awkward posture at traditionally Designed looms can cause high prevalence of musculoskeletal disorders (MSDs) among carpet weavers. A comprehensive study was conducted in this industry with the objectives of determination of MSDs symptoms prevalence; identification of major factors associated with MSDs symptoms in carpet weaving occupation; and development of guidelines for weaving Workstation Design. In the present paper, this ergonomics study is presented. The study consisted of two phases. In the first phase, MSDs symptoms in nine Iranian provinces were surveyed by questionnaire among 1439 randomly selected weavers. Working posture and weaving Workstations were ergonomically assessed as well. The results of this phase revealed that symptoms from the musculoskeletal system occured in high rate among weavers with the prevalence significantly higher than that of the general Iranian population ( P 0.001 ). It was found that the majority of ergonomics shortcomings originated from ill-Designed weaving Workstation. Based on the findings, some general guidelines for Workstation Design were presented. In the second phase, considering the general guidelines, an adjustable Workstation was Designed and constructed. To develop quantitative guidlenes for optimizing Workstation set-up, in the laboratory, nine sets of experimental conditions were tested, and working posture and weavers’ perceptions were measured. The results of this lab work showed that working posture was acceptable for both the researchers and the weavers when the weaving height was adjusted 20 cm above the elbow height and a high seat with forward slope was used. By combining the results of the two phases, guidelines for weaving Workstation Design were presented. In this ergonomics-oriented Workstation, loom is vertical. Seat, loom and weaving heights are adjustable. There is enough leg room under the loom. The seat with 10° forward slope is adjusted 15 cm above the popliteal height of the weaver. Weaving height is set at 20 cm above the elbow height. It is believed that the recommended Workstation improves working posture and results in reduced postural stress on weavers’ bodies and, consequently, reduced prevalence of MSDs symptoms.
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musculoskeletal symptoms as related to ergonomic factors in iranian hand woven carpet industry and general guidelines for Workstation Design
International Journal of Occupational Safety and Ergonomics, 2004Co-Authors: Alireza Choobineh, Mohammadali Lahmi, Reza Khani Jazani, Houshang Shahnavaz, Mostafa HosseiniAbstract:Carpet weaving is a high risk occupation for developing musculoskeletal disorders (MSDs). The objectives of the present study, which was carried out in the Iranian hand-woven carpet industry, were determination of the prevalence of MSD symptoms, identification of major factors associated with MSD symptoms and development of guidelines for Workstation Design. 1,439 randomly selected weavers participated in this study. A questionnaire was used to collect data on MSD symptoms. The results revealed that the prevalence rates for symptoms in different body regions were high as compared to the general Iranian population (for neck, back and large joints, p < .0001). The results of multivariate analyses showed that major ergonomic factors associated with musculoskeletal symptoms were loom type, working posture, daily working time and seat type. Based on the results, some general guidelines for Designing weaving Workstations were developed. A prototype test showed that the new Workstation was acceptable for subject tests and that it improved working posture. MSDs in small-scale industries posture assessment in carpet hand weaving operation MSDs in industrially developing countries (IDCs) weaving Workstation Design
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Workstation Design in carpet hand weaving operation guidelines for prevention of musculoskeletal disorders
International Journal of Occupational Safety and Ergonomics, 2004Co-Authors: Alireza Choobineh, Mostafa Hosseini, Mohammadali Lahmi, Houshang Shahnavaz, Reza Khani JazaniAbstract:Carpet weavers suffer from musculoskeletal problems mainly attributed to poor working postures. Their posture is mostly constrained by the Design of Workstations. This study was conducted to investigate the effects of 2 Design parameters (weaving height and seat type) on postural variables and subjective experience, and to develop guidelines for Workstation adjustments. At an experimental Workstation, 30 professional weavers worked in 9 different conditions. Working posture and weavers’ perceptions were measured. It was shown that head, neck and shoulder postures were influenced by weaving height. Both Design parameters influenced trunk and elbows postures. The determinant factor for weavers’ perception on the neck, shoulders and elbows was found to be weaving height, and on the back and knees it was seat type. Based on the results, the following guidelines were developed: (a) weaving height should be adjusted to 20 cm above elbow height; (b) a 10o forward-sloping high seat is to be used at weaving Workstations. weaving Workstation Design carpet hand-weaving operation musculoskeletal problems, working posture
Pascal Madeleine - One of the best experts on this subject based on the ideXlab platform.
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Kinematic synergy in a real and a virtual simulated assembly task
2015Co-Authors: Afshin Samani, Charles Pontonnier, Georges Dumont, Pascal MadeleineAbstract:In ergonomics, digital mock-ups of Workstation Design in virtual reality environments are often used to evaluate the occupational risks related to a working condition. However, the effectiveness of such technology, particularly in terms of human performance can be questionable. In the present study, we investigated the pattern of movement variability in a simulated assembly task and presented an index of task performance that can highlight the differences in terms of motor control strategy between a real assembly task and its virtual simulation. The movement variability was decomposed into goal-equivalent and non-goal equivalent components and the ratio of these components was introduced as an index of performance. The ratio was greater in the real than in the virtual environment. This study highlights the differences in terms of motor control strategies in real and virtual environments. Practitioner Summary: A simulated assembly task was implemented in a real and a virtual environment. A performance index in light of the motor control theory was introduced. This index could discern a lower performance in the virtual compared with the real environment. The developed approach can provide an objective index to investigate the system fidelity in virtual environments.
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trend validation of a musculoskeletal model with a Workstation Design parameter
arXiv: Medical Physics, 2012Co-Authors: Charles Pontonnier, Mark De Zee, Afshin Samani, Georges Dumont, Pascal MadeleineAbstract:The aim of this article is to present the application of a trend validation to validate a simulation model. The Workstation parameter used to define the trend is the table height of simulated meat cutting tasks (well known to be related to MSD).
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Cutting force and EMG recording for ergonomics assessment of meat cutting tasks : influence of the workbench height and the cutting direction on muscle activation levels
2012Co-Authors: Charles Pontonnier, Mark De Zee, Afshin Samani, Georges Dumont, Pascal MadeleineAbstract:Repetitive arm movement and force exertion are common in meat cutting tasks and often lead to musculosketal disorders. In this study, the effects of the workbench height and the cutting direction on the levels of muscular activation of the upper extremity during meat cutting tasks were investigated. Seven subjects performed 4 trials of 20s each at the 4 different heights (0cm, -10cm, -20cm and -30cm below the elbow height), alternating two cutting directions. Activation levels of upper extremity muscles (biceps brachii, triceps long head, deltoideus anterior, deltoideus medialis and upper trapezius) and cutting forces were recorded synchronously. Then the trends of the normalized activations with regard to the workplace Design parameters (table height and cutting direction) were computed. Results showed that the optimal configuration is a partially related to the task, whereas motor control strategies have also an influence on it. The present results provide new key information about the effects of workbench heights during a repetitive meat cutting task and a complete assessment protocol to analyse Workstation Design parameters influence on muscles activation levels.
