Denys Denis - Academia.edu (original) (raw)

Papers by Denys Denis

Research paper thumbnail of Évaluation D'Une Batterie De Tests Pour La Sélection Des Jointeurs D'Une Firme Hydroélectrique

Science & Sports, 1997

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Research paper thumbnail of Stock management influence on manual materials handling in two warehouse superstores

International Journal of Industrial Ergonomics, 2006

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Research paper thumbnail of Work factors affecting manual materials handling in a warehouse superstore

International Journal of Industrial Ergonomics, 2005

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Research paper thumbnail of Développement et évaluation d'une stratégie d'observation de conditions à risque pour la manutention

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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Research paper thumbnail of Enquête québécoise sur des conditions de travail, d’emploi et de santé et de sécurité du travail (EQCOTESST)

Perspectives interdisciplinaires sur le travail et la santé, 2011

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Research paper thumbnail of Airplane Maintenance: Musculoskeletal Disorders vs Difficulties Identified by Workers and by Workstation Characterization

Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 2000

ABSTRACT Export Date: 12 April 2011, Source: Scopus

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Research paper thumbnail of Apprentissage et polyvalence : quand la réalité nous rattrape

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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Research paper thumbnail of Analyse des activités de manutention de journaliers d'une grande municipalité québécoise : un outil pour composer avec le caractère changeant de la manutention

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Research paper thumbnail of Impact of observers' experience and training on reliability of observations for a manual handling task

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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Research paper thumbnail of 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

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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Research paper thumbnail of WHAT CAN WE ANTICIPATE FROM STUDYING EXPERT HANDLERS?

Journal of Biomechanics, 2007

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Research paper thumbnail of Biomechanical differences between expert and novice workers in a manual material handling task

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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Research paper thumbnail of Relative importance of expertise, lifting height and weight lifted on posture and lumbar external loading during a transfer task in manual material handling

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.

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Research paper thumbnail of Impact of observers' experience and training on reliability of observations for a manual handling task

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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Research paper thumbnail of La formation visant la prise en charge globale des troubles musculo-squelettiques par l’entreprise : une étude exploratoire

Perspectives interdisciplinaires sur le travail et la santé, 2011

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Research paper thumbnail of Évaluation D'Une Batterie De Tests Pour La Sélection Des Jointeurs D'Une Firme Hydroélectrique

Science & Sports, 1997

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Stock management influence on manual materials handling in two warehouse superstores

International Journal of Industrial Ergonomics, 2006

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Work factors affecting manual materials handling in a warehouse superstore

International Journal of Industrial Ergonomics, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Développement et évaluation d'une stratégie d'observation de conditions à risque pour la manutention

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

Research paper thumbnail of Enquête québécoise sur des conditions de travail, d’emploi et de santé et de sécurité du travail (EQCOTESST)

Perspectives interdisciplinaires sur le travail et la santé, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Airplane Maintenance: Musculoskeletal Disorders vs Difficulties Identified by Workers and by Workstation Characterization

Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 2000

ABSTRACT Export Date: 12 April 2011, Source: Scopus

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Apprentissage et polyvalence : quand la réalité nous rattrape

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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Research paper thumbnail of Analyse des activités de manutention de journaliers d'une grande municipalité québécoise : un outil pour composer avec le caractère changeant de la manutention

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Impact of observers' experience and training on reliability of observations for a manual handling task

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

Research paper thumbnail of 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

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

Research paper thumbnail of WHAT CAN WE ANTICIPATE FROM STUDYING EXPERT HANDLERS?

Journal of Biomechanics, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Biomechanical differences between expert and novice workers in a manual material handling task

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

Research paper thumbnail of Relative importance of expertise, lifting height and weight lifted on posture and lumbar external loading during a transfer task in manual material handling

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

Research paper thumbnail of Impact of observers' experience and training on reliability of observations for a manual handling task

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

Research paper thumbnail of La formation visant la prise en charge globale des troubles musculo-squelettiques par l’entreprise : une étude exploratoire

Perspectives interdisciplinaires sur le travail et la santé, 2011

Bookmarks Related papers MentionsView impact