Jeppe Frost

Danish Ramazzini Center

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Bo Eitel Seiferheld

Aalborg University

Regine Grytnes

Danish Ramazzini Center

David Høyrup Christiansen

Aarhus University

Annett Dalbøge

Aarhus University

Mathias Krog

Aalborg University

Christian Andersen

Aalborg University

Sebastian Skals

National Research Centre for the Working Environment

Afshin Samani

Aalborg University

Kent Kongsøre Klitgaard

Aalborg University

Jean‐Sébastien Roy

Université Laval

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Aalborg University

Biomechanics Institute of Valencia

Aarhus University

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Danish Ramazzini Center

Regional Hospital West Jutland

National Research Centre for the Working Environment

Regionshospitalet Herning

Regionshospitalet Silkeborg

Aarhus University Hospital

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Using a Shoulder Exoskeleton in Slaughterhouse Work: Expectations, Experiences, and Feasibility

Jeppe Frost David Høyrup Christiansen Annett Dalbøge Regine Grytnes

BACKGROUNDWork in the slaughterhouse industry increase the risk of shoulder disorders due to high occupational mechanical exposures. Assistive devices, such as exoskeletons, have been developed to reduce the mechanical exposures, but few studies have investigated exoskeleton´s feasibility, when used in a workplace setting.OBJECTIVESThe objective was to explore managers' and workers' expectations and experiences related to using a shoulder exoskeleton, and to evaluate its feasibility at a Danish slaughterhouse.PARTICIPANTSThe participants included 26 production line workers and their managers at a packaging department at a large slaughterhouse facility.METHODSIn a 5-month field study, data on worker´s expectations and experiences of using a shoulder exoskeleton, was compared to an existing assistive device (a 'lifting glove') and to working without any assistive device. Data was collected using semi-structured interviews, questionnaires, and on-site observations.RESULTSExpectations was that shoulder exoskeletons would reduce the mechanical exposure and strain in workers. Some managers also expected that workers could handle more weight/ produce more and that the need for job rotation could be reduced. Workers reported the exoskeleton to 'straighten the body', and reduced strain, but e others experienced no perceived support or found donning and doffing too time consuming.CONCLUSIONWe found different expectations as to what the shoulder exoskeleton should achieve. This could influence the evaluation of the feasibility of using a shoulder exoskeleton in slaughterhouse work. To facilitate the feasibility of exoskeletons it is important to explicate different expectations and to allow for individual tailoring in its implementation.

10.2139/ssrn.4384073

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New assistive walker improved local dynamic stability in young healthy adults

Journal of Electromyography and Kinesiology (2020)

Bo Eitel Seiferheld Jeppe Frost Christian Andersen Afshin Samani

Cadence

STRIDE

10.1016/j.jelekin.2020.102441

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Citations (6)

Using a shoulder exoskeleton in slaughterhouse work: Expectations, experiences, and feasibility

International Journal of Industrial Ergonomics (2024)

Jeppe Frost David Høyrup Christiansen Annett Dalbøge Regine Grytnes

10.1016/j.ergon.2023.103505

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Citations (1)

Full-Body Kinematics and Vertical Ground Reaction Forces in Elite Ten-Pin Bowling: A Field Study

Sensors (2023)

Bo Eitel Seiferheld Jeppe Frost Thorstein Brynildsen Østergaard Mathias Krog Kent Kongsøre Klitgaard

The purpose was to investigate full-body kinematics and vertical ground reaction forces in the lower extremities of the delivery and to determine delivery changes over time after many deliveries in ten-pin bowling. Six male elite ten-pin bowlers completed six bouts of twelve bowling deliveries, all strike attempts, while measuring full-body kinematics and vertical ground reaction forces. Full-body joint angles, peak vertical ground reaction forces in the feet, vertical breaking impulse, centre of mass velocity, bowling score, and ball release velocity (BRvel) were measured. Results revealed that the BRvel was significantly decreased over bouts (p < 0.001). Additionally, increased flexion of the dominant wrist (p < 0.001) and elbow (p = 0.004) prior to ball release (BR) and increased pronation of the dominant wrist during BR (p = 0.034) were observed at later bouts. It was concluded that these kinematic changes in the dominant wrist and elbow prior to and during BR were performed to compensate for the change in traction between ball and lane during a bowling match. This, in turn, caused a decrease in BRvel. A conservation of energy perspective was discussed to highlight training applications and possibilities to enhance elite athletes' bowling performance.

Ground reaction force

10.3390/s23198284

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Biomechanical investigation of a passive upper-extremity exoskeleton for manual material handling - a computational parameter study and modelling approach

International Journal of Human Factors Modelling and Simulation (2022)

Bo Eitel Seiferheld Jeppe Frost Mathias Krog Sebastian Skals Christian Andersen

Passive upper-extremity exoskeletons may decrease the risk of developing work-related musculoskeletal disorders. This study examined how shoulder muscle forces and biomechanical loads in the glenohumeral and L4-L5 joint changed as different support torque (1.1 Nm-11.2 Nm) and angle settings (60°-120°) of an exoskeleton were simulated during an overhead manual material handling task. Full-body kinematics of 15 grocery workers, who lifted a bread case (7.9 kg) onto shopping shelves (145.5 cm), were captured on site. The kinematic data were used to drive a detailed human-exoskeleton model based on inverse dynamics. Generally, simulations with maximum torque combined with a peak angle setting between 75°-105° reduced L4-L5 compression and anteroposterior shear forces, glenohumeral contact forces and shoulder flexor muscle forces. The exoskeleton therefore, seemed effective for reducing physical exposure during overhead handling. However, maximum torque with the lowest angle setting, 60°, increased musculoskeletal loading, suggesting that not adjusting the exoskeleton properly could be detrimental.

Inverse dynamics

Biomechanics

10.1504/ijhfms.2022.124304

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Citations (6)

Biomechanical investigation of a passive upper-extremity exoskeleton for manual material handling - a computational parameter study and modelling approach

International Journal of Human Factors Modelling and Simulation (2022)

Bo Eitel Seiferheld Michael Skipper Andersen Jeppe Frost Mathias Krog Sebastian Skals

Passive upper-extremity exoskeletons may decrease the risk of developing work-related musculoskeletal disorders.This study examined how shoulder muscle forces and biomechanical loads in the glenohumeral and L4-L5 joint changed as different support torque (1.1-11.2Nm) and angle settings (60-120°) of an exoskeleton were simulated during an overhead manual material handling task.Full-body kinematics of 15 grocery workers, who lifted a bread case (7.9 kg) onto shopping shelfs (145.5 cm), were captured on site.The kinematic data were used to drive a detailed humanexoskeleton model based on inverse dynamics.Generally, simulations with maximum torque combined with a peak angle setting between 75-105° reduced L4-L5 compression and anteroposterior shear forces, glenohumeral contact forces and shoulder flexor muscle forces.The exoskeleton therefore, seemed effective for reducing physical exposure during overhead handling.However, maximum torque with the lowest angle setting, 60°, increased musculoskeletal loading, suggesting that not adjusting the exoskeleton properly could be detrimental.

Biomechanics

10.1504/ijhfms.2022.10048946

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Effects of a passive shoulder exoskeleton on muscle activity among Danish slaughterhouse workers

Applied Ergonomics (2023)

Annett Dalbøge Jeppe Frost Regine Grytnes Jean‐Sébastien Roy Afshin Samani

To evaluate the effect of a shoulder exoskeleton on muscle activity and to compare the effect with a lifting glove among slaughterhouse workers in occupational settings.We conducted a crossover study of 26 workers measured during two work days with and without the use of a passive shoulder exoskeleton and a lifting glove at a Danish slaughterhouse. Electromyography sensors were placed bilateral on 5 shoulder muscles. The 10th, 50th, and 90th percentiles of muscle activity normalized by maximal voluntary contractions were measured and analyzed using mixed effect models.For the 50th percentiles of the agonist muscles, the exoskeleton reduced muscle activity bilaterally for deltoid anterior with up to 29.47%, deltoid middle with 10.22%, and upper trapezius with 22.21%. The lifting glove only reduced muscle activity for right deltoid anterior (36.59%) and upper trapezius (7.11%), but generally increased left muscle activity with up to 15.58%.The exoskeleton showed larger reductions in muscle activity compared to the lifting glove.

Danish

10.1016/j.apergo.2023.104111

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Citations (1)