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Dupuis F, Prud’Homme F, Tougas A, Campeau-Lecours A, Mercier C, Roy JS. The effect of a task-specific training on upper limb performance and kinematics while performing a reaching task in a fatigued state. PLoS One 2024; 19:e0297283. [PMID: 38252643 PMCID: PMC10802943 DOI: 10.1371/journal.pone.0297283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 01/02/2024] [Indexed: 01/24/2024] Open
Abstract
BACKGROUND Fatigue impacts motor performance and upper limb kinematics. It is of interest to study whether it is possible to minimize the potentially detrimental effects of fatigue with prevention programs. OBJECTIVE To determine the effect of task-specific training on upper limb kinematics and motor performance when reaching in a fatigued state. METHODS Thirty healthy participants were recruited (Training group n = 15; Control group n = 15). Both groups took part in two evaluation sessions (Day 1 and Day 5) during which they performed a reaching task (as quickly and accurately as possible) in two conditions (rested and fatigued). During the reaching task, joint kinematics and motor performance (accuracy and speed) were evaluated. The Training group participated in three task-specific training sessions between Day 1 and Day 5; they trained once a day, for three days. The Control group did not perform any training. A three-way non-parametric ANOVA for repeated measures (Nonparametric Analysis of Longitudinal Data; NparLD) was used to assess the impact of the training (Condition [within subject]: rested, fatigued; Day [within subject]: Day 1 vs. Day 5 and Group [between subjects]: Training vs. Control). RESULTS After the training period, the Training group significantly improved their reaching speed compared to the Control group (Day x Group p < .01; Time effect: Training group = p < .01, Control group p = .20). No between-group difference was observed with respect to accuracy. The Training group showed a reduction in contralateral trunk rotation and lateral trunk flexion in Day 2 under the fatigue condition (Group x Day p < .04; Time effect: Training group = p < .01, Control group = p < .59). CONCLUSION After the 3-day training, participants demonstrated improved speed and reduced reliance on trunk compensations to complete the task under fatigue conditions. Task-specific training could help minimizing some effects of fatigue.
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Affiliation(s)
- Frédérique Dupuis
- Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration (Cirris), Quebec City, Quebec, Canada
| | - Félix Prud’Homme
- Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration (Cirris), Quebec City, Quebec, Canada
| | - Arielle Tougas
- Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration (Cirris), Quebec City, Quebec, Canada
| | - Alexandre Campeau-Lecours
- Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration (Cirris), Quebec City, Quebec, Canada
- Faculty of Science and Engineering, Université Laval, Quebec City, Quebec, Canada
| | - Catherine Mercier
- Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration (Cirris), Quebec City, Quebec, Canada
| | - Jean-Sébastien Roy
- Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration (Cirris), Quebec City, Quebec, Canada
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Souchet AD, Lourdeaux D, Burkhardt JM, Hancock PA. Design guidelines for limiting and eliminating virtual reality-induced symptoms and effects at work: a comprehensive, factor-oriented review. Front Psychol 2023; 14:1161932. [PMID: 37359863 PMCID: PMC10288216 DOI: 10.3389/fpsyg.2023.1161932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 05/16/2023] [Indexed: 06/28/2023] Open
Abstract
Virtual reality (VR) can induce side effects known as virtual reality-induced symptoms and effects (VRISE). To address this concern, we identify a literature-based listing of these factors thought to influence VRISE with a focus on office work use. Using those, we recommend guidelines for VRISE amelioration intended for virtual environment creators and users. We identify five VRISE risks, focusing on short-term symptoms with their short-term effects. Three overall factor categories are considered: individual, hardware, and software. Over 90 factors may influence VRISE frequency and severity. We identify guidelines for each factor to help reduce VR side effects. To better reflect our confidence in those guidelines, we graded each with a level of evidence rating. Common factors occasionally influence different forms of VRISE. This can lead to confusion in the literature. General guidelines for using VR at work involve worker adaptation, such as limiting immersion times to between 20 and 30 min. These regimens involve taking regular breaks. Extra care is required for workers with special needs, neurodiversity, and gerontechnological concerns. In addition to following our guidelines, stakeholders should be aware that current head-mounted displays and virtual environments can continue to induce VRISE. While no single existing method fully alleviates VRISE, workers' health and safety must be monitored and safeguarded when VR is used at work.
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Affiliation(s)
- Alexis D. Souchet
- Heudiasyc UMR 7253, Alliance Sorbonne Université, Université de Technologie de Compiègne, CNRS, Compiègne, France
- Institute for Creative Technologies, University of Southern California, Los Angeles, CA, United States
| | - Domitile Lourdeaux
- Heudiasyc UMR 7253, Alliance Sorbonne Université, Université de Technologie de Compiègne, CNRS, Compiègne, France
| | | | - Peter A. Hancock
- Department of Psychology, University of Central Florida, Orlando, FL, United States
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De Bock S, Ampe T, Rossini M, Tassignon B, Lefeber D, Rodriguez-Guerrero C, Roelands B, Geeroms J, Meeusen R, De Pauw K. Passive shoulder exoskeleton support partially mitigates fatigue-induced effects in overhead work. APPLIED ERGONOMICS 2023; 106:103903. [PMID: 36148702 DOI: 10.1016/j.apergo.2022.103903] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 09/04/2022] [Accepted: 09/09/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND Despite the potential of occupational passive shoulder exoskeletons (PSEs) to relieve overhead work, limited insights in overhead work precision performance impedes large-scale adoption in industry. OBJECTIVE To investigate the effect of PSE support on the reduction in task performance caused by physical fatigue. METHODS This experiment consisted of a randomized, counterbalanced cross-over design comparing Exo4Work PSE support and no support, in a physically fatigued state and a control condition. Precision performance was determined using execution speed and drilling errors. Muscle activity and shoulder joint kinematics were recorded. RESULTS Fatigue altered task performance, shoulder joint kinematics, muscle activity and subjective experience during overhead work. The PSE support mitigated the fatigue-induced changes in shoulder kinematics. Additionally, a part of the fatigue-induced co-activation of shoulder stabilizing muscles was avoided when working with the PSE. The PSE support also reduced the activity of the anterior and medial deltoid. CONCLUSION Physical fatigue provokes compensatory movements and increased co-contraction of muscles when executing overhead work. These fatigue-induced alterations are generally believed to increase the overall musculoskeletal load. The support provided by the PSE reduced muscle activity of muscles working to elevate the arm, but also partially mitigated those fatigue-induced effects. SIGNIFICANCE This study shows that the effect of PSE support on precision performance is limited, and suggested that, apart from the known effects of PSE support during overhead work, wearing the exoskeleton in a physically fatigued state may provide additional advantages.
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Affiliation(s)
- Sander De Bock
- BruBotics, Vrije Universiteit Brussel, Brussels, Belgium; Human Physiology and Sports Physiotherapy Research Group, Vrije Universiteit Brussel, Brussels, Belgium
| | - Toon Ampe
- BruBotics, Vrije Universiteit Brussel, Brussels, Belgium; Human Physiology and Sports Physiotherapy Research Group, Vrije Universiteit Brussel, Brussels, Belgium
| | - Marco Rossini
- BruBotics, Vrije Universiteit Brussel, Brussels, Belgium; Robotics and Multibody Mechanics Research Group, Vrije Universiteit Brussel and Flanders Make, Brussels, Belgium
| | - Bruno Tassignon
- BruBotics, Vrije Universiteit Brussel, Brussels, Belgium; Human Physiology and Sports Physiotherapy Research Group, Vrije Universiteit Brussel, Brussels, Belgium
| | - Dirk Lefeber
- BruBotics, Vrije Universiteit Brussel, Brussels, Belgium; Robotics and Multibody Mechanics Research Group, Vrije Universiteit Brussel and Flanders Make, Brussels, Belgium
| | - Carlos Rodriguez-Guerrero
- BruBotics, Vrije Universiteit Brussel, Brussels, Belgium; Robotics and Multibody Mechanics Research Group, Vrije Universiteit Brussel and Flanders Make, Brussels, Belgium
| | - Bart Roelands
- BruBotics, Vrije Universiteit Brussel, Brussels, Belgium; Human Physiology and Sports Physiotherapy Research Group, Vrije Universiteit Brussel, Brussels, Belgium
| | - Joost Geeroms
- BruBotics, Vrije Universiteit Brussel, Brussels, Belgium; Robotics and Multibody Mechanics Research Group, Vrije Universiteit Brussel and Flanders Make, Brussels, Belgium
| | - Romain Meeusen
- BruBotics, Vrije Universiteit Brussel, Brussels, Belgium; Human Physiology and Sports Physiotherapy Research Group, Vrije Universiteit Brussel, Brussels, Belgium
| | - Kevin De Pauw
- BruBotics, Vrije Universiteit Brussel, Brussels, Belgium; Human Physiology and Sports Physiotherapy Research Group, Vrije Universiteit Brussel, Brussels, Belgium.
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Goubault E, Martinez R, Assila N, Monga-Dubreuil É, Dowling-Medley J, Dal Maso F, Begon M. Effect of Expertise on Shoulder and Upper Limb Kinematics, Electromyography, and Estimated Muscle Forces During a Lifting Task. HUMAN FACTORS 2022; 64:800-819. [PMID: 33236930 DOI: 10.1177/0018720820965021] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
OBJECTIVE To highlight the working strategies used by expert manual handlers compared with novice manual handlers, based on recordings of shoulder and upper limb kinematics, electromyography (EMG), and estimated muscle forces during a lifting task. BACKGROUND Novice workers involved in assembly, manual handling, and personal assistance tasks are at a higher risk of upper limb musculoskeletal disorders (MSDs). However, few studies have investigated the effect of expertise on upper limb exposure during workplace tasks. METHOD Sixteen experts in manual handling and sixteen novices were equipped with 10 electromyographic electrodes to record shoulder muscle activity during a manual handling task consisting of lifting a box (8 or 12 kg), instrumented with three six-axis force sensors, from hip to eye level. Three-dimensional trunk and upper limb kinematics, hand-to-box contact forces, and EMG were recorded. Then, joint contributions, activation levels, and muscle forces were calculated and compared between groups. RESULTS Sternoclavicular-acromioclavicular joint contributions were higher in experts at the beginning of the movement, and in novices at the end, whereas the opposite was observed for the glenohumeral joint. EMG activation levels were 37% higher for novices but predicted muscle forces were higher in experts. CONCLUSION This study highlights significant differences between experts and novices in shoulder kinematics, EMG, and muscle forces; hence, providing effective work guidelines to ensure the development of a safe handling strategy is important. APPLICATION Shoulder kinematics, EMG, and muscle forces could be used as ergonomic tools to identify inappropriate techniques that could increase the prevalence of shoulder injuries.
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Affiliation(s)
| | | | - Najoua Assila
- 5622 Université de Montréal, Montréal, QC, Canada
- Sainte-Justine Hospital Research Center, Montréal, QC, Canada
| | | | | | - Fabien Dal Maso
- 5622 Université de Montréal, Montréal, QC, Canada
- Centre Interdisciplinaire sur le Cerveau et l'Apprentissage, Montréal, QC, Canada
| | - Mickael Begon
- 5622 Université de Montréal, Montréal, QC, Canada
- Sainte-Justine Hospital Research Center, Montréal, QC, Canada
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Dupuis F, Sole G, Mercier C, Roy JS. Impact of fatigue at the shoulder on the contralateral upper limb kinematics and performance. PLoS One 2022; 17:e0266370. [PMID: 35363812 PMCID: PMC8975159 DOI: 10.1371/journal.pone.0266370] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 03/18/2022] [Indexed: 12/03/2022] Open
Abstract
Background Altered movement patterns have been proposed as an etiological factor for the development of musculoskeletal pain. Fatigue influences upper limb kinematics and movement performance which could extend to the contralateral limb and potentially increasing risk of injury. The aim of this study was to investigate the impact of fatigue at the dominant arm on the contralateral upper limb movement. Methods Forty participants were randomly assigned to one of two groups: Control or Fatigue Group. All participants completed a reaching task at the baseline and post-experimental phase, during which they reached four targets with their non-dominant arm in a virtual reality environment. Following the baseline phase, the Fatigue Group completed a shoulder fatigue protocol with their dominant arm only, while the Control Group took a 10-minute break. Thereafter, the reaching task was repeated. Upper limb and trunk kinematics (joint angles and excursions), spatiotemporal (speed and accuracy) and surface electromyographic (sEMG) activity (sEMG signal mean epoch amplitude and median frequency of the EMG power spectrum) were collected. Two-way repeated-measures ANOVA were performed to determine the effects of Time, Group and of the interaction between these factors. Results There was a significant Time x Group interaction for sternoclavicular elevation range of motion (p = 0.040), movement speed (p = 0.043) and accuracy (p = 0.033). The Fatigue group showed higher contralateral sternoclavicular elevation and increased movement error while experiencing fatigue in the dominant arm. Moreover, the Control group increased their speed during the Post-experimental phase compared to baseline (p = 0.043), while the Fatigue group did not show any speed improvement. There was no EMG sign of fatigue in any of the muscles evaluated. Conclusion This study showed that fatigue at the dominant shoulder impacts movement at the contralateral upper limb. Such changes may be a risk factor for the development of shoulder pain in both the fatigued and non-fatigued limbs.
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Affiliation(s)
- Frédérique Dupuis
- Faculty of Medicine, Université Laval, Quebec City, Canada
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec City, Canada
| | - Gisela Sole
- Centre for Health, Activity and Rehabilitation Research, School of Physiotherapy, University of Otago, Dunedin, New Zealand
| | - Catherine Mercier
- Faculty of Medicine, Université Laval, Quebec City, Canada
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec City, Canada
| | - Jean-Sébastien Roy
- Faculty of Medicine, Université Laval, Quebec City, Canada
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec City, Canada
- * E-mail:
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Asadi H, Monfared S, Athanasiadis DI, Stefanidis D, Yu D. Continuous, integrated sensors for predicting fatigue during non-repetitive work: demonstration of technique in the operating room. ERGONOMICS 2021; 64:1160-1173. [PMID: 33974511 DOI: 10.1080/00140139.2021.1909753] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 03/21/2021] [Indexed: 06/12/2023]
Abstract
Surface electromyography (sEMG) can monitor muscle activity and potentially predict fatigue in the workplace. However, objectively measuring fatigue is challenging in complex work with unpredictable work cycles where sEMG may be influenced by the dynamically changing posture demands. This study proposes a multi-modal approach integrating sEMG with motion sensors and demonstrates the approach in the live surgical work environment. Seventy-two exposures from twelve participants were collected, including self-reported musculoskeletal discomfort, sEMG, and postures. Posture sensors were used to identify time windows where the surgeon was static and in non-demanding positions, and mean power frequencies (MPF) were then calculated during those time windows. In 57 out of 72 exposures (80%), participants experienced an increase in musculoskeletal discomfort. Integrated (multi-modality) measurements showed better performance than single-modality (sEMG) measurements in detecting decreases in MPF, a predictor of fatigue. Based on self-reported musculoskeletal discomfort, sensor-based thresholds for identifying fatigue are proposed for the trapezius and deltoid muscle groups. Practitioner summary Work-related fatigue is one of the intermediate risk factors to musculoskeletal disorders. This article presents an objective integrated approach to identify musculoskeletal fatigue using wearable sensors. The presented approach could be implemented by ergonomists to identify musculoskeletal fatigue more accurately and in a variety of workplaces. Abbreviations: sEMG: surface electromyography; IMU: inertia measurement unit; MPF: mean power frequency; ACGIH: American Conference of Governmental Industrial Hygienists; SAGES: Society of American Gastrointestinal and Endoscopic Surgeons; LD: left deltoid; LT: left trapezius; RD: right deltoid; RT: right trapezius.
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Affiliation(s)
- Hamed Asadi
- School of Industrial Engineering, Purdue University, West Lafayette, IN, USA
| | - Sara Monfared
- Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, USA
| | | | - Dimitrios Stefanidis
- Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Denny Yu
- School of Industrial Engineering, Purdue University, West Lafayette, IN, USA
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Dupuis F, Sole G, Wassinger C, Bielmann M, Bouyer LJ, Roy JS. Fatigue, induced via repetitive upper-limb motor tasks, influences trunk and shoulder kinematics during an upper limb reaching task in a virtual reality environment. PLoS One 2021; 16:e0249403. [PMID: 33831037 PMCID: PMC8031876 DOI: 10.1371/journal.pone.0249403] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Accepted: 03/17/2021] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Efficient shoulder movement depends on the ability of central nervous system to integrate sensory information and to create an appropriate motor command. Various daily encountered factors can potentially compromise the execution of the command, such as fatigue. This study explored how fatigue influences shoulder movements during upper limb reaching. METHODS Forty healthy participants were randomly assigned to one of two groups: Control or Fatigue Group. All participants completed an upper limb reaching task at baseline and post-experimental, during which they reached four targets located at 90° of shoulder abduction, 90° external rotation at 90° abduction, 120° scaption, and 120° flexion in a virtual reality environment. Following the baseline phase, the Fatigue Group completed a shoulder fatigue protocol, while Controls took a 10-minute break. Thereafter, the reaching task was repeated. Upper limb kinematic (joint angles and excursions) and spatiotemporal (speed and accuracy) data were collected during the reaching task. Electromyographic activity of the anterior and middle deltoids were also collected to characterize fatigue. Two-way repeated-measures ANOVA were performed to determine the effects of Time, Group and of the interaction between these factors. RESULTS The Fatigue group showed decreased mean median power frequency and increased electromyographic amplitudes of the anterior deltoid (p < 0.05) following the fatigue protocol. Less glenohumeral elevation, increased trunk flexion and rotation and sternoclavicular elevation were also observed in the Fatigue group (Group x Time interaction, p < 0.05). The Control group improved their movement speed and accuracy in post-experimental phase, while the Fatigue group showed a decrease of movement speed and no accuracy improvement (Group x Time interaction, p < 0.05). CONCLUSION In a fatigued state, changes in movement strategy were observed during the reaching task, including increased trunk and sternoclavicular movements and less glenohumeral movement. Performance was altered as shown by the lack of accuracy improvement over time and a decrease in movement speed in the Fatigue group.
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Affiliation(s)
- Frédérique Dupuis
- Faculty of Medicine, Université Laval, Quebec City, Canada
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec City, Canada
| | - Gisela Sole
- Centre for Health, Activity and Rehabilitation Research, School of Physiotherapy, University of Otago, Dunedin, New Zealand
| | - Craig Wassinger
- Department of Physical Therapy, East Tennessee State University, Johnson City, TN, United States of America
| | - Mathieu Bielmann
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec City, Canada
| | - Laurent J. Bouyer
- Faculty of Medicine, Université Laval, Quebec City, Canada
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec City, Canada
| | - Jean-Sébastien Roy
- Faculty of Medicine, Université Laval, Quebec City, Canada
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec City, Canada
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Gaudez C, Mouzé-Amady M. Which subject-related variables contribute to movement variability during a simulated repetitive and standardised occupational task? Recurrence quantification analysis of surface electromyographic signals. ERGONOMICS 2021; 64:366-382. [PMID: 33026299 DOI: 10.1080/00140139.2020.1834148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 10/04/2020] [Indexed: 06/11/2023]
Abstract
Movement variability is a component of human movement. This study applied recurrence quantification analysis (RQA) on electromyographic signals to determine the effects of two types of variables on movement variability during a short, simulated repetitive and standardised occupational clip-fitting task. The electrical activity of six muscles in the dominant upper limb was recorded in 21 participants. Variables related to the task performance (insertion force and movements performed when fitting clips) affected RQA measures: recurrence rate (RR), percentage of determinism (DET) and diagonal line length entropy (ENT). Variables related to participant's characteristics (sex, age, and BMI) affected only DET and ENT. A constrasting variability was observed such as a high-DET value combined with a high-ENT value and inversely. Variables affected mainly the recurrences organisation of the more distal muscles. Even if movement variability is complex, it should be considered by ergonomists and work place designers to better understanding of operators' movements. Practitioner summary: It is essential to consider the complexity of operators' movement variability to understand their activities. Based on intrinsic movement variability knowledge, ergonomists and work place designers will be able to modulate the movement variability by acting on workstation designs and occupational organisation with the aim of preserving operators' health. Abbreviations: RR: recurrence rate; DET: percentage of determinism; ENT: diagonal line length entropy; BMI: body mass index; FDS: flexor digitorum superficialis; EXT: extensor digitorum communis; BIC: biceps brachii; TRI: triceps brachii; DEL: deltoideus anterior; TRA: trapezius pars descendens; F: female; M: male; S: supinated; P: pronated; CM: continuous movement; DM: discontinuous movement.
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Affiliation(s)
- Clarisse Gaudez
- INRS - Institut National de Recherche et de Sécurité, Vandoeuvre cedex, France
| | - Marc Mouzé-Amady
- INRS - Institut National de Recherche et de Sécurité, Vandoeuvre cedex, France
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Mulla DM, McDonald AC, Keir PJ. Joint moment trade-offs across the upper extremity and trunk during repetitive work. APPLIED ERGONOMICS 2020; 88:103142. [PMID: 32421639 DOI: 10.1016/j.apergo.2020.103142] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 04/28/2020] [Accepted: 05/01/2020] [Indexed: 06/11/2023]
Abstract
Individuals can coordinate small kinematic changes at several degrees of freedom simultaneously in the presence of fatigue, leaving it unclear how overall biomechanical demands at each joint are altered. The purpose of this study was to evaluate trade-offs in joint moments between the trunk, shoulder, and elbow during repetitive upper extremity work. Participants performed four simulated workplace tasks cyclically until meeting fatigue termination criteria. Emergent fatigue-induced adaptations to repetitive work resulted in task-dependent trade-offs in joint moments. In general, reduced shoulder moments were compensated for by increased elbow and trunk joint moment contributions. Although mean joint moment changes were modest (range: 1-3 Nm) across participants, a wide distribution of responses was observed, with standard deviations exceeding 10 Nm. Re-distributing biomechanical demands across joints may alleviate constant tissue loads and facilitate continued task performance with fatigue but may be at the expense of increasing demands at adjacent joints.
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Affiliation(s)
- Daanish M Mulla
- Department of Kinesiology, McMaster University, Hamilton, ON, Canada
| | - Alison C McDonald
- Department of Kinesiology, McMaster University, Hamilton, ON, Canada
| | - Peter J Keir
- Department of Kinesiology, McMaster University, Hamilton, ON, Canada.
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