Denys Denis - Academia.edu (original) (raw)
Papers by Denys Denis
Science & Sports, 1997
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International Journal of Industrial Ergonomics, 2006
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International Journal of Industrial Ergonomics, 2005
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It is accepted that material handling is an activity presenting a high risk for injury, particula... more It is accepted that material handling is an activity presenting a high risk for injury, particularly to the back. In this study, an observation strategy has been developed and validated in order to evaluate the presence of these risky conditions while performing a handling task. ...
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Perspectives interdisciplinaires sur le travail et la santé, 2011
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Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 2000
ABSTRACT Export Date: 12 April 2011, Source: Scopus
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La communication porte sur le processus d’implantation de la rotation dans deux stations d’assemb... more La communication porte sur le processus d’implantation de la rotation dans deux stations d’assemblage de la cabine dans une importante usine du secteur de l’aéronautique. Il s’agit de tâches d’assemblage complexes, caractérisées par des cycles longs avec des exigences de qualité considérables .Dans une analyse préalable, les deux stations de travail sont découpées en fonction des grandes étapes de la production : 14 unités de rotation sont ainsi décrites et pour chacune d’elles les difficultés d’apprentissage et les risque de TMS sont caractérisés. Le processus d’implantation de la rotation est mis en branle. Sur un mode participatif, les affectations pour un essai de rotation sont définies. La rotation est implantée et un suivi est effectué. Il ressort que depuis l’analyse préliminaire, la population a changé, il y a beaucoup de novices et, au total, l’expérience cumulée est de beaucoup réduite. Les affectations réelles diffèrent des affectations prévues et beaucoup d’interactions ...
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Ergonomics, Jan 15, 2002
Observation reliability (agreement percentage and kappa coefficients) for six experienced ergonom... more Observation reliability (agreement percentage and kappa coefficients) for six experienced ergonomists and six untrained participants was computed. Participants were first tested after a training session and 1 week later after an additional practice session. Two formats were used: free practice and directed exercise. Reliability was tested for 17 variables and 20 sequences using photographic and video supports. The participants were asked to indicate whether they were confident about their answer, to rate this confidence on a scale of 1 to 10, and when the confidence rating was below 8, to provide a reason for this. Experience and additional practices had no clear impact on reliability, which was excellent overall. The main reason given was that the event to be observed took place at the borderline between two classes. The observers' rating on the scale appeared to be tied to the subsequent reliability computed. The use of a confidence scale appeared to be a useful tool for forec...
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Conditions préalables à l'implantation de la rotation chez une population d'assembleurs-m... more Conditions préalables à l'implantation de la rotation chez une population d'assembleurs-monteurs du secteur de l'aéronautique L'impact des exigences de qualité sur le développement de la polyvalence et sur l'apprentissage Prévention durable en SST et environnement de travail
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Journal of Biomechanics, 2007
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Ergonomics, 2010
The objective was to verify whether the methods were safer and more efficient when used by expert... more The objective was to verify whether the methods were safer and more efficient when used by expert handlers than by novice handlers. Altogether, 15 expert and 15 novice handlers were recruited. Their task was to transfer four boxes from a conveyor to a hand trolley. Different characteristics of the load and lifting heights were modified to achieve a larger variety of methods by the participants. The results show that the net moments at the L5/S1 joint were not significantly different (p > 0.05) for the two groups. However, compared with the novices, the experts bent their lumbar region less (experts 54° (SD 11°); novices 66° (SD 15°)) but bent their knees more (experts approx. 72° (SD approx. 30°); novices approx. 53° (SD approx. 33°), which brought them closer to the box. The handler's posture therefore seems to be a major aspect that should be paid specific attention, mainly when there is maximum back loading. STATEMENT OF RELEVANCE: The findings of this research will be useful for improving manual material handling training programmes. Most biomechanical research is based on novice workers and adding information about the approach used by expert handlers in performing their tasks will help provide new avenues for reducing the risk of injury caused by this demanding physical task.
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Ergonomics, 2012
The objective of this study was to measure the effect size of three important factors in manual m... more The objective of this study was to measure the effect size of three important factors in manual material handling, namely expertise, lifting height and weight lifted. The effect of expertise was evaluated by contrasting 15 expert and 15 novice handlers, the effect of the weight lifted with a 15-kg box and a 23-kg box and the effect of lifting height with two different box heights: ground level and a 32 cm height. The task consisted of transferring a series of boxes from a conveyor to a hand trolley. Lifting height and weight lifted had more effect size than expertise on external back loading variables (moments) while expertise had low impact. On the other hand, expertise showed a significant effect of posture variables on the lumbar spine and knees. All three factors are important, but for a reduction of external back loading, the focus should be on the lifting height and weight lifted. The objective was to measure the effect size of three important factors in a transfer of boxes from a conveyor to a hand trolley. Lifting height and weight lifted had more effect size than expertise on external back loading variables but expertise was a major determinant in back posture.
Bookmarks Related papers MentionsView impact
Ergonomics, 2002
Observation reliability (agreement percentage and kappa coefficients) for six experienced ergonom... more Observation reliability (agreement percentage and kappa coefficients) for six experienced ergonomists and six untrained participants was computed. Participants were first tested after a training session and 1 week later after an additional practice session. Two formats were used: free practice and directed exercise. Reliability was tested for 17 variables and 20 sequences using photographic and video supports. The participants were asked to indicate whether they were confident about their answer, to rate this confidence on a scale of 1 to 10, and when the confidence rating was below 8, to provide a reason for this. Experience and additional practices had no clear impact on reliability, which was excellent overall. The main reason given was that the event to be observed took place at the borderline between two classes. The observers' rating on the scale appeared to be tied to the subsequent reliability computed. The use of a confidence scale appeared to be a useful tool for forecasting observation problems.
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Perspectives interdisciplinaires sur le travail et la santé, 2011
Bookmarks Related papers MentionsView impact
Science & Sports, 1997
Bookmarks Related papers MentionsView impact
International Journal of Industrial Ergonomics, 2006
Bookmarks Related papers MentionsView impact
International Journal of Industrial Ergonomics, 2005
Bookmarks Related papers MentionsView impact
It is accepted that material handling is an activity presenting a high risk for injury, particula... more It is accepted that material handling is an activity presenting a high risk for injury, particularly to the back. In this study, an observation strategy has been developed and validated in order to evaluate the presence of these risky conditions while performing a handling task. ...
Bookmarks Related papers MentionsView impact
Perspectives interdisciplinaires sur le travail et la santé, 2011
Bookmarks Related papers MentionsView impact
Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 2000
ABSTRACT Export Date: 12 April 2011, Source: Scopus
Bookmarks Related papers MentionsView impact
La communication porte sur le processus d’implantation de la rotation dans deux stations d’assemb... more La communication porte sur le processus d’implantation de la rotation dans deux stations d’assemblage de la cabine dans une importante usine du secteur de l’aéronautique. Il s’agit de tâches d’assemblage complexes, caractérisées par des cycles longs avec des exigences de qualité considérables .Dans une analyse préalable, les deux stations de travail sont découpées en fonction des grandes étapes de la production : 14 unités de rotation sont ainsi décrites et pour chacune d’elles les difficultés d’apprentissage et les risque de TMS sont caractérisés. Le processus d’implantation de la rotation est mis en branle. Sur un mode participatif, les affectations pour un essai de rotation sont définies. La rotation est implantée et un suivi est effectué. Il ressort que depuis l’analyse préliminaire, la population a changé, il y a beaucoup de novices et, au total, l’expérience cumulée est de beaucoup réduite. Les affectations réelles diffèrent des affectations prévues et beaucoup d’interactions ...
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Ergonomics, Jan 15, 2002
Observation reliability (agreement percentage and kappa coefficients) for six experienced ergonom... more Observation reliability (agreement percentage and kappa coefficients) for six experienced ergonomists and six untrained participants was computed. Participants were first tested after a training session and 1 week later after an additional practice session. Two formats were used: free practice and directed exercise. Reliability was tested for 17 variables and 20 sequences using photographic and video supports. The participants were asked to indicate whether they were confident about their answer, to rate this confidence on a scale of 1 to 10, and when the confidence rating was below 8, to provide a reason for this. Experience and additional practices had no clear impact on reliability, which was excellent overall. The main reason given was that the event to be observed took place at the borderline between two classes. The observers' rating on the scale appeared to be tied to the subsequent reliability computed. The use of a confidence scale appeared to be a useful tool for forec...
Bookmarks Related papers MentionsView impact
Conditions préalables à l'implantation de la rotation chez une population d'assembleurs-m... more Conditions préalables à l'implantation de la rotation chez une population d'assembleurs-monteurs du secteur de l'aéronautique L'impact des exigences de qualité sur le développement de la polyvalence et sur l'apprentissage Prévention durable en SST et environnement de travail
Bookmarks Related papers MentionsView impact
Journal of Biomechanics, 2007
Bookmarks Related papers MentionsView impact
Ergonomics, 2010
The objective was to verify whether the methods were safer and more efficient when used by expert... more The objective was to verify whether the methods were safer and more efficient when used by expert handlers than by novice handlers. Altogether, 15 expert and 15 novice handlers were recruited. Their task was to transfer four boxes from a conveyor to a hand trolley. Different characteristics of the load and lifting heights were modified to achieve a larger variety of methods by the participants. The results show that the net moments at the L5/S1 joint were not significantly different (p > 0.05) for the two groups. However, compared with the novices, the experts bent their lumbar region less (experts 54° (SD 11°); novices 66° (SD 15°)) but bent their knees more (experts approx. 72° (SD approx. 30°); novices approx. 53° (SD approx. 33°), which brought them closer to the box. The handler's posture therefore seems to be a major aspect that should be paid specific attention, mainly when there is maximum back loading. STATEMENT OF RELEVANCE: The findings of this research will be useful for improving manual material handling training programmes. Most biomechanical research is based on novice workers and adding information about the approach used by expert handlers in performing their tasks will help provide new avenues for reducing the risk of injury caused by this demanding physical task.
Bookmarks Related papers MentionsView impact
Ergonomics, 2012
The objective of this study was to measure the effect size of three important factors in manual m... more The objective of this study was to measure the effect size of three important factors in manual material handling, namely expertise, lifting height and weight lifted. The effect of expertise was evaluated by contrasting 15 expert and 15 novice handlers, the effect of the weight lifted with a 15-kg box and a 23-kg box and the effect of lifting height with two different box heights: ground level and a 32 cm height. The task consisted of transferring a series of boxes from a conveyor to a hand trolley. Lifting height and weight lifted had more effect size than expertise on external back loading variables (moments) while expertise had low impact. On the other hand, expertise showed a significant effect of posture variables on the lumbar spine and knees. All three factors are important, but for a reduction of external back loading, the focus should be on the lifting height and weight lifted. The objective was to measure the effect size of three important factors in a transfer of boxes from a conveyor to a hand trolley. Lifting height and weight lifted had more effect size than expertise on external back loading variables but expertise was a major determinant in back posture.
Bookmarks Related papers MentionsView impact
Ergonomics, 2002
Observation reliability (agreement percentage and kappa coefficients) for six experienced ergonom... more Observation reliability (agreement percentage and kappa coefficients) for six experienced ergonomists and six untrained participants was computed. Participants were first tested after a training session and 1 week later after an additional practice session. Two formats were used: free practice and directed exercise. Reliability was tested for 17 variables and 20 sequences using photographic and video supports. The participants were asked to indicate whether they were confident about their answer, to rate this confidence on a scale of 1 to 10, and when the confidence rating was below 8, to provide a reason for this. Experience and additional practices had no clear impact on reliability, which was excellent overall. The main reason given was that the event to be observed took place at the borderline between two classes. The observers' rating on the scale appeared to be tied to the subsequent reliability computed. The use of a confidence scale appeared to be a useful tool for forecasting observation problems.
Bookmarks Related papers MentionsView impact
Perspectives interdisciplinaires sur le travail et la santé, 2011
Bookmarks Related papers MentionsView impact