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Chander DS, Tomezzoli A, Cavatorta MP, Gréau M, Marie S, Pontonnier C. Biomechanical requirements of meat cutting tasks: A pilot study quantifying tasks sustainability and assistance required at the wrist. APPLIED ERGONOMICS 2024; 116:104186. [PMID: 38052153 DOI: 10.1016/j.apergo.2023.104186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 11/14/2023] [Accepted: 11/27/2023] [Indexed: 12/07/2023]
Abstract
The meat processing industry is particularly affected by distal upper limb musculoskeletal disorders. This pilot study aims at proposing a methodology able to quantify biomechanical requirements of meat cutting tasks at butchers' dominant wrist and, when necessary, at estimating the assistance needed to reach sustainability. Six professional butchers repeatedly cut pieces of pork. Joint angles were recorded using a motion capture system, cutting forces using an instrumented knife. Sustainability was computed by the maximal acceptable effort method. Assistance requirements were computed for isolated stressful exertions and for overall work cycle sustainability. Five butchers exceeded the sustainability threshold for wrist flexion. Ulnar or radial deviation torques were excessive for 2 and 3 of them, respectively. Extension torques were sustainable. The peak assistive torque for isolated exertions was at most 1.1Nm, 1.6Nm and 1.1Nm, and the percentage of assistance for overall sustainability was at most 60%, 56% and 56% for wrist flexion, ulnar and radial deviation, respectively.
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Mathieu E, Crémoux S, Duvivier D, Amarantini D, Pudlo P. Biomechanical modeling for the estimation of muscle forces: toward a common language in biomechanics, medical engineering, and neurosciences. J Neuroeng Rehabil 2023; 20:130. [PMID: 37752507 PMCID: PMC10521397 DOI: 10.1186/s12984-023-01253-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 09/18/2023] [Indexed: 09/28/2023] Open
Abstract
Different research fields, such as biomechanics, medical engineering or neurosciences take part in the development of biomechanical models allowing for the estimation of individual muscle forces involved in motor action. The heterogeneity of the terminology used to describe these models according to the research field is a source of confusion and can hamper collaboration between the different fields. This paper proposes a common language based on lexical disambiguation and a synthesis of the terms used in the literature in order to facilitate the understanding of the different elements of biomechanical modeling for force estimation, without questioning the relevance of the terms used in each field or the different model components or their interest. We suggest that the description should start with an indication of whether the muscle force estimation problem is solved following the physiological movement control (from the nervous drive to the muscle force production) or in the opposite direction. Next, the suitability of the model for force production estimation at a given time or for monitoring over time should be specified. Authors should pay particular attention to the method description used to find solutions, specifying whether this is done during or after data collection, with possible method adaptations during processing. Finally, the presence of additional data must be specified by indicating whether they are used to drive, assist, or calibrate the model. Describing and classifying models in this way will facilitate the use and application in all fields where the estimation of muscle forces is of real, direct, and concrete interest.
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Affiliation(s)
- Emilie Mathieu
- Univ. Polytechnique Hauts-de-France, LAMIH, CNRS, UMR 8201, Campus Mont Houy, 59313, Valenciennes, France
| | - Sylvain Crémoux
- Centre de Recherche Cerveau et Cognition (CerCO), UMR CNRS 5549, Paul Sabatier University, Toulouse, France
| | - David Duvivier
- Univ. Polytechnique Hauts-de-France, LAMIH, CNRS, UMR 8201, Campus Mont Houy, 59313, Valenciennes, France
| | - David Amarantini
- ToNIC, Toulouse NeuroImaging Center, Université de Toulouse, Inserm, Paul Sabatier University, Toulouse, France.
| | - Philippe Pudlo
- Univ. Polytechnique Hauts-de-France, LAMIH, CNRS, UMR 8201, Campus Mont Houy, 59313, Valenciennes, France
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Shengxian Y, Zongxing L, Jing W, Lin G. The effect of the 2-UPS/RR ankle rehabilitation robot with coupling biomechanical model on muscle behaviors. Med Biol Eng Comput 2023; 61:421-434. [PMID: 36459326 DOI: 10.1007/s11517-022-02704-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Accepted: 09/21/2022] [Indexed: 12/03/2022]
Abstract
With the popularization of biomechanical simulation technology, aiming at the rehabilitation of ankle joint injury, we imported simplified model of proposed 2-UPS/RR (two identical unconstraint kinematic branches with a universal-prismatic-spherical (UPS) structure and two rotating pair (R)) ankle rehabilitation robot into AnyBody Modeling System. Therefore, a human-machine model was established using the HILL-type muscle model and muscle recruitment criteria. This paper investigated the effects of rehabilitation trajectories on biomechanical response during rehabilitation. Additionally, three main lower limb muscles (soleus, peroneal brevis, and extensor digitorum longus) were examined under different rehabilitation trajectories (plantar dorsiflexion, varus or valgus, and compound movement) in the present study. Based on the biomechanical response of lower limbs, the results showed that different muscles had different sensitivities to the change of rehabilitation trajectories. The correlation coefficient between joint force and plantar dorsiflexion angle reached 0.99 (P < 0.01), indicating that the change of joint force was mainly dominated by plantar dorsiflexion/plantar flexion, but also affected by varus or valgus. Safe rehabilitation training can be achieved by controlling the designed 2-UPS/RR rehabilitation robot. The behavior of muscle force and joint force under different rehabilitation trajectories can meet the needs of rehabilitation and treatment of joint diseases, and provide more reasonable suggestions for early rehabilitation.
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Affiliation(s)
- You Shengxian
- School of Mechanical Engineering and Automation, Fuzhou University, No. 2 Xueyuan Road, Fuzhou, 350116, Fujian, China
| | - Lu Zongxing
- School of Mechanical Engineering and Automation, Fuzhou University, No. 2 Xueyuan Road, Fuzhou, 350116, Fujian, China.
| | - Wang Jing
- School of Mechanical Engineering and Automation, Fuzhou University, No. 2 Xueyuan Road, Fuzhou, 350116, Fujian, China
| | - Guo Lin
- School of Mechanical Engineering and Automation, Fuzhou University, No. 2 Xueyuan Road, Fuzhou, 350116, Fujian, China
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Alexander N, Schwameder H, Baker R, Trinler U. Effect of different walking speeds on joint and muscle force estimation using AnyBody and OpenSim. Gait Posture 2021; 90:197-203. [PMID: 34509042 DOI: 10.1016/j.gaitpost.2021.08.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 08/23/2021] [Accepted: 08/30/2021] [Indexed: 02/02/2023]
Abstract
BACKGROUND To be able to use muscluloskeletal models in clinical settings, it is important to understand the effect of walking speed on joint and muscle force estimations in different generic musculoskeletal models. RESEARCH QUESTION The aim of the current study is to compare estimated joint and muscle forces as a function of walking speed between two standard approaches offered in two different modelling environments (AnyBody and OpenSim). METHODS Experimental data of 10 healthy participants were recorded at three different walking speeds (self-selected, 25 % slower, 25 % faster) using a ten-camera motion capture system together with four force plates embedded into a ten-meter walkway. Joint compression forces and muscle forces were calculated with a generic model in AnyBody and OpenSim. Trend analyses, mean absolute error (MAE) and correlation coefficients were used to compare joint compression forces and muscle forces between the two approaches. A one-way and two-way ANOVA with repeated measures were used to compare MAE and trend analysis changes, respectively (α = 0.05, Bonferroni corrected post-hoc tests). RESULTS Trend analyses showed the same speed effect for AnyBody and OpenSim. MAEs increased significantly from slow to fast walking for knee joint compression forces, biceps femoris long head, gluteus maximus, gluteus medius and vastus intermedius. Lower correlation coefficients during slower walking were found for quadriceps muscles, gluteus maximus and biceps femoris compared to normal and faster walking. SIGNIFICANCE Lower correlation coefficients during slower walking are assumed to be due to a higher amount of solutions solving the muscle recruitment in musculoskeletal models. This indicates that decreasing walking speed is more prone to speed dependent differences regarding variability, while the absolute error increased with increasing walking speed. To conclude, different modelling environments can react differently to changes in walking speed, but overall results are promising regarding the generalization across different generic musculoskeletal models.
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Affiliation(s)
- Nathalie Alexander
- Department of Sport Science and Kinesiology, University of Salzburg, Salzburg, Austria; Laboratory for Motion Analysis, Department of Paediatric Orthopaedics, Children's Hospital of Eastern Switzerland, St. Gallen, Switzerland; Department of Orthopaedics and Traumatology, Cantonal Hospital, St. Gallen, Switzerland.
| | - Hermann Schwameder
- Department of Sport Science and Kinesiology, University of Salzburg, Salzburg, Austria
| | - Richard Baker
- School of Health Science, University of Salford, Manchester, United Kingdom
| | - Ursula Trinler
- School of Health Science, University of Salford, Manchester, United Kingdom; Andreas Wentzensen Research Institut, BG Unfallklinik Ludwigshafen, Germany
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Tirloni SF, Tirloni AS, Roqueiro N, Díaz Merino EA, Schmidt Alves Díaz Merino G, Moro ARP. Cutting force measurement: Hand tool instrumentation used in slaughterhouses - a systematic review. EXCLI JOURNAL 2021; 20:727-747. [PMID: 33907540 PMCID: PMC8073857 DOI: 10.17179/excli2021-3167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Accepted: 03/29/2021] [Indexed: 11/10/2022]
Abstract
Workers' intensive use of hand tool cutting in the meat packing industry is a risk factor for occupational health, mainly by mechanical compression of tissues in the upper limbs, which can cause Work-Related Musculoskeletal Disorders (WMSDs). This systematic review aimed to identify the characteristics and measured variables of instrumented knives and determine how they should be designed. The review process and article extractions occurred through an analysis of the (article) titles, keywords and abstracts, followed by reading the full texts by two reviewers independently. Searches were conducted in Medline, Web of Science, Science Direct, Scopus, Ebsco and Engineering Village for articles published in peer-reviewed journals from January 2000 to March 2019, in the English language. The result of (the) search included 1289 potentially eligible studies, with 894 duplicated/triplicated/quadruplicated articles that were excluded, resulting in 404 remaining articles of which 33 were considered eligible, with 36 additional articles, totaling 69 evaluated full texts. After the review, none of the 14 analyzed studies, were rated as having good methodological quality. In addition, four types of instrumented knives were used. Data acquisition was performed in both laboratory and meat processing plants. It is noteworthy that only one knife was submitted to a validation process and that the articles did not provide complete technical information about the knives. The result demonstrated that the cutting force varies within and between subjects, tasks, plants and blade finishings. All knives used some type of electrical connection via cable or wires. Of the articles found, none considered the influences that the workers are subject to when they do not use the same tool daily for data acquisition. Therefore, the development of different types of instrumented knives, with wireless data transmission and more rigorous studies are necessary to expand the knowledge of the cutting force and development of WMSD in slaughterhouse workers who perform meat cutting.
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Affiliation(s)
| | | | - Nestor Roqueiro
- Technological Center, Federal University of Santa Catarina, SC, Brazil.,Automation and Systems Engineering, Federal University of Santa Catarina, SC, Brazil
| | - Eugenio Andrés Díaz Merino
- Technological Center, Federal University of Santa Catarina, SC, Brazil.,Communication and Expression Center, Federal University of Santa Catarina, SC, Brazil
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Denadai MS, Alouche SR, Valentim DP, Padula RS. An ergonomics educational training program to prevent work-related musculoskeletal disorders to novice and experienced workers in the poultry processing industry: A quasi-experimental study. APPLIED ERGONOMICS 2021; 90:103234. [PMID: 32932013 DOI: 10.1016/j.apergo.2020.103234] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Revised: 07/26/2020] [Accepted: 07/31/2020] [Indexed: 06/11/2023]
Abstract
This quasi-experimental study was conducted in a poultry processing industry with the aim of assessing the benefits of ergonomics educational training for novice and experienced workers in preventing work-related musculoskeletal disorders. Sociodemographic and occupational questionnaires were used to evaluate age, marital status, education, time in job, musculoskeletal complaints and pain intensity, perceived effort, biomechanical exposure, and perception of ease or difficulty in adoption of ergonomics educational training. Musculoskeletal complaints in the neck, back, and wrists were reduced with training, but pain intensity was reduced only in the wrist region. A reduction in the occupational biomechanical exposure from the baseline to immediately post-training and 2 months after training both for novice and experienced workers was also observed. The novice workers group differed from the experienced workers by presenting a higher reduction of biomechanical exposure in the cutting room. All workers in this study benefited from the ergonomics educational training in the short and medium term. However, the success of training was highly dependent on the content and approach of the training.
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Affiliation(s)
| | - Sandra Regina Alouche
- Masters and Doctoral Program in Physical Therapy, Universidade Cidade de São Paulo, SP, Brazil; Department of Physical Therapy, Universidade Cidade de São Paulo, SP, Brazil
| | | | - Rosimeire Simprini Padula
- Masters and Doctoral Program in Physical Therapy, Universidade Cidade de São Paulo, SP, Brazil; Department of Physical Therapy, Universidade Cidade de São Paulo, SP, Brazil.
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7
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Tirloni AS, dos Reis DC, Tirloni SF, Moro ARP. Exertion Perception When Performing Cutting Tasks in Poultry Slaughterhouses: Risk Assessment of Developing Musculoskeletal Disorders. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17249534. [PMID: 33352725 PMCID: PMC7766802 DOI: 10.3390/ijerph17249534] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 12/09/2020] [Accepted: 12/16/2020] [Indexed: 11/20/2022]
Abstract
Brazil is the leader in poultry meat exports, in which most products are in the form of cuts. This study analyzed the exertion perception of poultry slaughterhouses workers when performing cutting tasks, as well as the influence of knife sharpness on the risk of developing musculoskeletal disorders by Occupational Repetitive Action (OCRA) method. Participants (n = 101) from three slaughterhouses were asked to rate their perceived exertion on the Borg scale during the cutting task when the knife was well and poorly sharpened. The OCRA results showed that the score for cutting with a dull knife was greater (43.57 ± 13.51) than with a sharp knife (23.79 ± 3.10) (p < 0.001). Consequently, there was a significant increase in the risk level of acquiring upper-limb work-related musculoskeletal disorders (UL-WMSD) by using a “poorly sharpened” knife (29%; p < 0.001; Borg scale 2–8). Thus, maintaining well-sharpened knives for optimal performance of the cutting task (fewer technical actions) is suggested, as well as including knife sharpening in the standard operating procedure to reduce musculoskeletal disorders.
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Affiliation(s)
- Adriana Seára Tirloni
- School of Technology, Federal University of Santa Catarina, Florianópolis, Santa Catarina 88040-370, Brazil; (S.F.T.); (A.R.P.M.)
- Correspondence: ; Tel.: +55-48-3721-4776
| | - Diogo Cunha dos Reis
- Biomechanics Laboratory, Center of Sports (CDS), Federal University of Santa Catarina, Florianópolis, Santa Catarina 88040-370, Brazil;
| | - Salvador Francisco Tirloni
- School of Technology, Federal University of Santa Catarina, Florianópolis, Santa Catarina 88040-370, Brazil; (S.F.T.); (A.R.P.M.)
| | - Antônio Renato Pereira Moro
- School of Technology, Federal University of Santa Catarina, Florianópolis, Santa Catarina 88040-370, Brazil; (S.F.T.); (A.R.P.M.)
- Biomechanics Laboratory, Center of Sports (CDS), Federal University of Santa Catarina, Florianópolis, Santa Catarina 88040-370, Brazil;
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Martinez R, Assila N, Goubault E, Begon M. Sex differences in upper limb musculoskeletal biomechanics during a lifting task. APPLIED ERGONOMICS 2020; 86:103106. [PMID: 32342895 DOI: 10.1016/j.apergo.2020.103106] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 03/26/2020] [Accepted: 03/27/2020] [Indexed: 06/11/2023]
Abstract
Women experience higher prevalence of work-related upper limb musculoskeletal disorders compared to men. Previous studies have investigated the biological, kinematic and electromyographic sex-related differences during a lifting task but the actual differences in musculoskeletal loads remain unknown. We investigated the sex differences in three musculoskeletal indicators: the sum of muscle activations, the sum of muscle forces and the relative time spent beyond a shear-compression dislocation ratio. A musculoskeletal model was scaled on 20 women and 20 men lifting a 6 or 12kg box from hip to eye level. Women generated more muscle forces and activations than men, regardless of the lifted mass. Those differences occurred when the box was above shoulder level. In addition, women might spend more time beyond a shear-compression dislocation ratio. Our work suggests higher musculoskeletal loads among women compared to men during a lifting task, which could be the result of poor technique and strength difference.
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Affiliation(s)
- Romain Martinez
- School of Kinesiology and Exercise Science, Faculty of Medicine, University of Montreal, Canada.
| | - Najoua Assila
- School of Kinesiology and Exercise Science, Faculty of Medicine, University of Montreal, Canada
| | - Etienne Goubault
- School of Kinesiology and Exercise Science, Faculty of Medicine, University of Montreal, Canada
| | - Mickaël Begon
- School of Kinesiology and Exercise Science, Faculty of Medicine, University of Montreal, Canada
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Castro MN, Rasmussen J, Bai S, Andersen MS. Validation of subject-specific musculoskeletal models using the anatomical reachable 3-D workspace. J Biomech 2019; 90:92-102. [DOI: 10.1016/j.jbiomech.2019.04.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 04/25/2019] [Accepted: 04/26/2019] [Indexed: 01/08/2023]
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Dupré T, Dietzsch M, Komnik I, Potthast W, David S. Agreement of measured and calculated muscle activity during highly dynamic movements modelled with a spherical knee joint. J Biomech 2018; 84:73-80. [PMID: 30587376 DOI: 10.1016/j.jbiomech.2018.12.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Revised: 12/07/2018] [Accepted: 12/10/2018] [Indexed: 11/24/2022]
Abstract
The inclusion of muscle forces into the analysis of joint contact forces has improved their accuracy. But it has not been validated if such force and activity calculations are valid during highly dynamic multidirectional movements. The purpose of this study was to validate calculated muscle activation of a lower extremity model with a spherical knee joint for running, sprinting and 90°-cutting. Kinematics, kinetics and lower limb muscle activation of ten participants were investigated in a 3D motion capture setup including EMG. A lower extremity rigid body model was used to calculate the activation of these muscles with an inverse dynamics approach and a cubic cost function. Correlation coefficients were calculated to compare measured and calculated activation. The results showed good correlation of the modelled and calculated data with a few exceptions. The highest average correlations were found during walking (r = 0.81) and the lowest during cutting (r = 0.57). Tibialis anterior had the lowest average correlation (r = 0.33) over all movements while gastrocnemius medius had the highest correlation (r = 0.9). The implementation of a spherical knee joint increased the agreement between measured and modelled activation compared to studies using a hinge joint knee. Although some stabilizing muscles showed low correlations during dynamic movements, the investigated model calculates muscle activity sufficiently.
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Affiliation(s)
- Thomas Dupré
- Institute of Biomechanics and Orthopaedics, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933 Cologne, Germany.
| | - Mareike Dietzsch
- Institute of Biomechanics and Orthopaedics, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933 Cologne, Germany
| | - Igor Komnik
- Institute of Biomechanics and Orthopaedics, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933 Cologne, Germany
| | - Wolfgang Potthast
- Institute of Biomechanics and Orthopaedics, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933 Cologne, Germany
| | - Sina David
- Institute of Biomechanics and Orthopaedics, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933 Cologne, Germany
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11
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Chander DS, Cavatorta MP. Multi-directional one-handed strength assessments using AnyBody Modeling Systems. APPLIED ERGONOMICS 2018; 67:225-236. [PMID: 29122194 DOI: 10.1016/j.apergo.2017.09.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 09/27/2017] [Accepted: 09/29/2017] [Indexed: 06/07/2023]
Abstract
Digital human modeling tools support proactive ergonomics in optimizing work tasks and workplace layouts. Empirical-statistical model based tools are often used to estimate the force exertion capability of the operators. This work is intended to serve as an initial probing into the usability of a musculoskeletal model based software, AnyBody Modeling Systems (AMS), in evaluating the force exertion capability at different points in the workspace and for various exertion directions. As a first step, it focuses on the modeling approach and the accuracy of one-handed isometric strength estimates of AMS. An existing literature database was used to compare the predicted strength at 8 hand locations and in 26 exertion directions, while simulating the empirical postures. The results show a correlation coefficient of 0.7 between the simulated and the experimental strength. AMS emphasizes the biomechanical advantages in strength due to the alignment of force exertion direction with the shoulder. Additionally, some discrepancies have been identified and discussed.
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Affiliation(s)
| | - Maria Pia Cavatorta
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Torino, Italy
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12
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Januario LB, Madeleine P, Cid MM, Samani A, Oliveira AB. Can exposure variation be promoted in the shoulder girdle muscles by modifying work pace and inserting pauses during simulated assembly work? APPLIED ERGONOMICS 2018; 66:151-160. [PMID: 28958424 DOI: 10.1016/j.apergo.2017.08.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 08/16/2017] [Accepted: 08/17/2017] [Indexed: 06/07/2023]
Abstract
This study investigated the acute effects of changing the work pace and implementing two pause types during an assembly task. Eighteen healthy women performed a simulated task in four different conditions: 1) slow or 2) fast work pace with 3) passive or 4) active pauses every two minutes. The root mean square (RMS) and exposure variation analysis (EVA) from the trapezius and serratus anterior muscles, as well as the rate of perceived exertion (RPE) from the neck-shoulder region, were observed. Decreased RMS and RPE as well as more variable muscle activity (EVA) were observed in the slow work pace compared with the fast one. The pause types had a limited effect, but active pauses resulted in increased RMS of the clavicular trapezius. The findings revealed the importance of work pace in the reduction of perceived exertion and promotion of variation in muscle activation during assembly tasks. However, the pause types had no important effect on the evaluated outcomes.
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Affiliation(s)
- Leticia Bergamin Januario
- Laboratory of Clinical and Occupational Kinesiology (LACO), Department of Physical Therapy, Federal University of São Carlos, São Carlos, São Paulo, Brazil; Laboratory for Ergonomics and Work-Related Disorders, Physical Activity and Human Performance Group - SMI, Department of Health Science and Technology, Aalborg University, Aalborg East, Denmark.
| | - Pascal Madeleine
- Laboratory for Ergonomics and Work-Related Disorders, Physical Activity and Human Performance Group - SMI, Department of Health Science and Technology, Aalborg University, Aalborg East, Denmark
| | - Marina Machado Cid
- Laboratory of Clinical and Occupational Kinesiology (LACO), Department of Physical Therapy, Federal University of São Carlos, São Carlos, São Paulo, Brazil
| | - Afshin Samani
- Laboratory for Ergonomics and Work-Related Disorders, Physical Activity and Human Performance Group - SMI, Department of Health Science and Technology, Aalborg University, Aalborg East, Denmark
| | - Ana Beatriz Oliveira
- Laboratory of Clinical and Occupational Kinesiology (LACO), Department of Physical Therapy, Federal University of São Carlos, São Carlos, São Paulo, Brazil
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Inter- and Intrasubject Similarity of Muscle Synergies During Bench Press With Slow and Fast Velocity. Motor Control 2017; 22:100-115. [PMID: 28338394 DOI: 10.1123/mc.2016-0026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We investigated the effect of low and high bar velocity on inter- and intrasubject similarity of muscle synergies during bench press. A total of 13 trained male subjects underwent two exercise conditions: a slow- and a fast-velocity bench press. Surface electromyography was recorded from 13 muscles, and muscle synergies were extracted using a nonnegative matrix factorization algorithm. The intrasubject similarity across conditions and intersubject similarity within conditions were computed for muscle synergy vectors and activation coefficients. Two muscle synergies were sufficient to describe the dataset variability. For the second synergy activation coefficient, the intersubject similarity within the fast-velocity condition was greater than the intrasubject similarity of the activation coefficient across the conditions. An opposite pattern was observed for the first muscle synergy vector. We concluded that the activation coefficients are robust within conditions, indicating a robust temporal pattern of muscular activity across individuals, but the muscle synergy vector seemed to be individually assigned.
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Karltun J, Vogel K, Bergstrand M, Eklund J. Maintaining knife sharpness in industrial meat cutting: A matter of knife or meat cutter ability. APPLIED ERGONOMICS 2016; 56:92-100. [PMID: 27184316 DOI: 10.1016/j.apergo.2016.03.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 03/18/2016] [Accepted: 03/20/2016] [Indexed: 06/05/2023]
Abstract
Knife sharpness is imperative in meat cutting. The aim of this study was to compare the impact of knife blade steel quality with meat cutters' individual ability to maintain the cutting edge sharp in an industrial production setting. Twelve meat cutters in two different companies using three different knives during normal production were studied in this quasi-experimental study. Methods included were measuring knife cutting force before and after knife use, time knives were used, ratings of sharpness and discomfort and interviews. Results showed that the meat cutters' skill of maintaining sharpness during work had a much larger effect on knife sharpness during work than the knife steel differences. The ability was also related to feelings of discomfort and to physical exertion. It was found that meat cutters using more knives were more likely to suffer from discomfort in the upper limbs, which is a risk for developing MSD.
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Affiliation(s)
- J Karltun
- School of Engineering, Jönköping University, P.O Box 1026, SE-551 11 Jönköping, Sweden.
| | - K Vogel
- KTH Royal Institute of Technology, STH, Unit of Ergonomics, Alfred Nobels allé 10, SE-141 52 Huddinge, Sweden.
| | - M Bergstrand
- Avonova Hälsa, Repslagaregatan 4, SE-591 30 Motala, Sweden.
| | - J Eklund
- KTH Royal Institute of Technology, STH, Unit of Ergonomics, Alfred Nobels allé 10, SE-141 52 Huddinge, Sweden.
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Heinen F, Lund ME, Rasmussen J, de Zee M. Muscle-tendon unit scaling methods of Hill-type musculoskeletal models: An overview. Proc Inst Mech Eng H 2016; 230:976-84. [PMID: 27459500 DOI: 10.1177/0954411916659894] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2016] [Accepted: 06/17/2016] [Indexed: 11/17/2022]
Abstract
This article gives an overview of the state of the art in scaling methods of generic Hill-type muscle model parameters in view of different applications and implementation of experimental data. This article establishes the requirements used to alter a generic model toward subject-specific musculoskeletal models. This article aims to improve model transparency by a structured description of scaling methods and the associated limitations in musculoskeletal models and highlight the importance of selecting a scaling method supporting the purpose of the model.
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Affiliation(s)
- Frederik Heinen
- Department of Health Science and Technology, Aalborg University, Aalborg, Denmark Department of Mechanical and Manufacturing Engineering, Aalborg University, Aalborg, Denmark
| | - Morten E Lund
- Department of Mechanical and Manufacturing Engineering, Aalborg University, Aalborg, Denmark
| | - John Rasmussen
- Department of Mechanical and Manufacturing Engineering, Aalborg University, Aalborg, Denmark
| | - Mark de Zee
- Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
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16
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Davoudabadi Farahani S, Andersen MS, de Zee M, Rasmussen J. Human arm posture prediction in response to isometric endpoint forces. J Biomech 2015; 48:4178-4184. [PMID: 26482735 DOI: 10.1016/j.jbiomech.2015.09.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Revised: 09/16/2015] [Accepted: 09/24/2015] [Indexed: 10/22/2022]
Abstract
The ability to predict the musculoskeletal response to external loads has multiple applications for the design of machines with a human interface and for the prediction of outcomes of musculoskeletal interventions. In this study, we applied an inverse-inverse dynamics technique to investigate its ability to predict arm posture in response to isometric hand forces. For each subject, we made a three-dimensional musculoskeletal model using the AnyBody Modelling System (AMS). Then, we had each subject-specific model hold a weight anteriorly to the right shoulder joint at a distance of half of the arm length. We selected the glenohumeral abduction angle (GHAA) as the only free parameter. Subsequently, we used inverse-inverse dynamics to find the optimal GHAA that minimised a performance criterion with physiological constraints. In this study, we investigated the performance of two different objective functions: summation of squared muscle activity (SSMA) and summation of squared normalised joint torques (SSNJT). To validate the simulation results, arm posture responses to different isometric downward hand forces were measured for six healthy male subjects. Five trials were performed for each loading condition. The results showed that, with an increase in hand load, there was a reduced GHAA in all subjects. Another interesting finding was that self-selected postures for lighter tasks varied more than postures for heavier tasks for all subjects. To understand this, we investigated the curvature of the objective function as a function of the load and observed an increased curvature with increased load. This may explain the reduced intra-subject variations observed for increasing loads.
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Affiliation(s)
| | - Michael Skipper Andersen
- Department of Mechanical and Manufacturing Engineering, Aalborg University, 9220 Aalborg East, Denmark
| | - Mark de Zee
- Department of Health Science and Technology, Aalborg University, 9220 Aalborg East, Denmark
| | - John Rasmussen
- Department of Mechanical and Manufacturing Engineering, Aalborg University, 9220 Aalborg East, Denmark
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17
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Kaklanis N, Stavropoulos G, Tzovaras D. Modeling people with motor disabilities to empower the automatic accessibility and ergonomic assessment of new products. APPLIED ERGONOMICS 2015; 51:120-136. [PMID: 26154211 DOI: 10.1016/j.apergo.2015.04.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Revised: 04/22/2015] [Accepted: 04/27/2015] [Indexed: 06/04/2023]
Abstract
Virtual User Models (VUMs) can be a valuable tool for accessibility and ergonomic evaluation of designs in simulation environments. As increasing the accessibility of a design is usually translated into additional costs and increased development time, the need for specifying the percentage of population for which the design will be accessible is crucial. This paper addresses the development of VUMs representing specific groups of people with disabilities. In order to create such VUMs, we need to know the functional limitations, i.e. disability parameters, caused by each disability and their variability over the population. Measurements were obtained from 90 subjects with motor disabilities and were analyzed using both parametric and nonparametric regression methods as well as a proposed hybrid regression method able to handle small sample sizes. Validation results showed that in most cases the proposed regression analysis can produce valid estimations on the variability of each disability parameter.
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Affiliation(s)
- Nikolaos Kaklanis
- Information Technologies Institute, Centre for Research and Technology Hellas, 6th Klm. Charilaou - Thermi Road, P.O. BOX 60361, GR-570 01, Thessaloniki, Greece.
| | - Georgios Stavropoulos
- Information Technologies Institute, Centre for Research and Technology Hellas, 6th Klm. Charilaou - Thermi Road, P.O. BOX 60361, GR-570 01, Thessaloniki, Greece.
| | - Dimitrios Tzovaras
- Information Technologies Institute, Centre for Research and Technology Hellas, 6th Klm. Charilaou - Thermi Road, P.O. BOX 60361, GR-570 01, Thessaloniki, Greece.
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18
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Duprey S, Savonnet L, Black N, Wang X. Muscle force prediction: can we rely on musculoskeletal model estimations? A case study on push force exertions with the upper limb. Comput Methods Biomech Biomed Engin 2015; 18 Suppl 1:1934-5. [DOI: 10.1080/10255842.2015.1069575] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- S. Duprey
- Université de Lyon, Lyon, France
- Université Claude Bernard Lyon 1, Villeurbanne, France
- LBMC Laboratoire de Biomécanique et Mécanique des Chocs, IFSTTAR, Bron, France
| | - L. Savonnet
- Université de Lyon, Lyon, France
- Université Claude Bernard Lyon 1, Villeurbanne, France
- LBMC Laboratoire de Biomécanique et Mécanique des Chocs, IFSTTAR, Bron, France
| | - N. Black
- Département de génie mécanique, Faculté d’ingénierie, Université de Moncton, Moncton, Canada
| | - X. Wang
- Université de Lyon, Lyon, France
- Université Claude Bernard Lyon 1, Villeurbanne, France
- LBMC Laboratoire de Biomécanique et Mécanique des Chocs, IFSTTAR, Bron, France
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19
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Samani A, Pontonnier C, Dumont G, Madeleine P. Shoulder kinematics and spatial pattern of trapezius electromyographic activity in real and virtual environments. PLoS One 2015; 10:e0116211. [PMID: 25768123 PMCID: PMC4358981 DOI: 10.1371/journal.pone.0116211] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Accepted: 12/05/2014] [Indexed: 11/29/2022] Open
Abstract
The design of an industrial workstation tends to include ergonomic assessment steps based on a digital mock-up and a virtual reality setup. Lack of interaction and system fidelity is often reported as a main issue in such virtual reality applications. This limitation is a crucial issue as thorough ergonomic analysis is required for an investigation of the biomechanics. In the current study, we investigated the biomechanical responses of the shoulder joint in a simulated assembly task for comparison with the biomechanical responses in virtual environments. Sixteen male healthy novice subjects performed the task on three different platforms: real (RE), virtual (VE), and virtual environment with force feedback (VEF) with low and high precision demands. The subjects repeated the task 12 times (i.e., 12 cycles). High density electromyography from the upper trapezius and rotation angles of the shoulder joint were recorded and split into the cycles. The angular trajectories and velocity profiles of the shoulder joint angles over a cycle were computed in 3D. The inter-subject similarity in terms of normalized mutual information on kinematics and electromyography was investigated. Compared with RE the task in VE and VEF was characterized by lower kinematic maxima. The inter-subject similarity in RE compared with intra-subject similarity across the platforms was lower in terms of movement trajectories and greater in terms of trapezius muscle activation. The precision demand resulted in lower inter- and intra-subject similarity across platforms. The proposed approach identifies biomechanical differences in the shoulder joint in both VE and VEF compared with the RE platform, but these differences are less marked in VE mostly due to technical limitations of co-localizing the force feedback system in the VEF platform.
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Affiliation(s)
- Afshin Samani
- Laboratory for Ergonomics and Work-related Disorders, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7 D-3, 9220, Aalborg East, Denmark
| | - Charles Pontonnier
- Centre de Recherche des Ecoles de Coëtquidan, Ecoles Militaires de Saint-Cyr Coëtquidan, 56 381, Guer, France
- MimeTIC, IRISA/INRIA Centre de Bretagne, Campus de Beaulieu, 35042, Rennes, France
| | - Georges Dumont
- MimeTIC, IRISA/INRIA Centre de Bretagne, Campus de Beaulieu, 35042, Rennes, France
- ENS Rennes, Campus de Ker Lann, 35170, Bruz, France
| | - Pascal Madeleine
- Laboratory for Ergonomics and Work-related Disorders, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7 D-3, 9220, Aalborg East, Denmark
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