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Zargari Marandi R, Madeleine P, Omland Ø, Vuillerme N, Samani A. An oculometrics-based biofeedback system to impede fatigue development during computer work: A proof-of-concept study. PLoS One 2019; 14:e0213704. [PMID: 31150405 PMCID: PMC6544207 DOI: 10.1371/journal.pone.0213704] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 05/18/2019] [Indexed: 12/19/2022] Open
Abstract
A biofeedback system may objectively identify fatigue and provide an individualized timing plan for micro-breaks. We developed and implemented a biofeedback system based on oculometrics using continuous recordings of eye movements and pupil dilations to moderate fatigue development in its early stages. Twenty healthy young participants (10 males and 10 females) performed a cyclic computer task for 31–35 min over two sessions: 1) self-triggered micro-breaks (manual sessions), and 2) biofeedback-triggered micro-breaks (automatic sessions). The sessions were held with one-week inter-session interval and in a counterbalanced order across participants. Each session involved 180 cycles of the computer task and after each 20 cycles (a segment), the task paused for 5-s to acquire perceived fatigue using Karolinska Sleepiness Scale (KSS). Following the pause, a 25-s micro-break involving seated exercises was carried out whether it was triggered by the biofeedback system following the detection of fatigue (KSS≥5) in the automatic sessions or by the participants in the manual sessions. National Aeronautics and Space Administration Task Load Index (NASA-TLX) was administered after sessions. The functioning core of the biofeedback system was based on a Decision Tree Ensemble model for fatigue classification, which was developed using an oculometrics dataset previously collected during the same computer task. The biofeedback system identified fatigue with a mean accuracy of approx. 70%. Perceived workload obtained from NASA-TLX was significantly lower in the automatic sessions compared with the manual sessions, p = 0.01 Cohen’s dz = 0.89. The results give support to the effectiveness of integrating oculometrics-based biofeedback in timing plan of micro-breaks to impede fatigue development during computer work.
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Affiliation(s)
- Ramtin Zargari Marandi
- Department of Health Science and Technology, Sport Sciences, Aalborg University, Aalborg, Denmark
- Univ. Grenoble Alpes, AGEIS, Grenoble, France
| | - Pascal Madeleine
- Department of Health Science and Technology, Sport Sciences, Aalborg University, Aalborg, Denmark
| | - Øyvind Omland
- Department of Health Science and Technology, Sport Sciences, Aalborg University, Aalborg, Denmark
- Aalborg University Hospital, Clinic of Occupational Medicine, Danish Ramazzini Center, Aalborg, Denmark
| | - Nicolas Vuillerme
- Department of Health Science and Technology, Sport Sciences, Aalborg University, Aalborg, Denmark
- Univ. Grenoble Alpes, AGEIS, Grenoble, France
- Institut Universitaire de France, Paris, France
| | - Afshin Samani
- Department of Health Science and Technology, Sport Sciences, Aalborg University, Aalborg, Denmark
- * E-mail:
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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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St-Onge N, Samani A, Madeleine P. Integration of active pauses and pattern of muscular activity during computer work. ERGONOMICS 2017; 60:1228-1239. [PMID: 28304226 DOI: 10.1080/00140139.2017.1303086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 03/01/2017] [Indexed: 06/06/2023]
Abstract
Submaximal isometric muscle contractions have been reported to increase variability of muscle activation during computer work; however, other types of active contractions may be more beneficial. Our objective was to determine which type of active pause vs. rest is more efficient in changing muscle activity pattern during a computer task. Asymptomatic regular computer users performed a standardised 20-min computer task four times, integrating a different type of pause: sub-maximal isometric contraction, dynamic contraction, postural exercise and rest. Surface electromyographic (SEMG) activity was recorded bilaterally from five neck/shoulder muscles. Root-mean-square decreased with isometric pauses in the cervical paraspinals, upper trapezius and middle trapezius, whereas it increased with rest. Variability in the pattern of muscular activity was not affected by any type of pause. Overall, no detrimental effects on the level of SEMG during active pauses were found suggesting that they could be implemented without a cost on activation level or variability. Practitioner Summary: We aimed to determine which type of active pause vs. rest is best in changing muscle activity pattern during a computer task. Asymptomatic computer users performed a standardised computer task integrating different types of pauses. Muscle activation decreased with isometric pauses in neck/shoulder muscles, suggesting their implementation during computer work.
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Affiliation(s)
- Nancy St-Onge
- a Department of Exercise Science , Concordia University , Montreal , Canada
- b Center for Interdisciplinary Research in Rehabilitation of Greater Montreal - Constance Lethbridge site , Montreal , Canada
- c 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
| | - Afshin Samani
- c 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
- c 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
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Rodriguez AC, Barrero LH. Job rotation: Effects on muscular activity variability. APPLIED ERGONOMICS 2017; 60:83-92. [PMID: 28166903 DOI: 10.1016/j.apergo.2016.11.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 10/25/2016] [Accepted: 11/04/2016] [Indexed: 06/06/2023]
Abstract
Job rotation strategies have been used for years as an administrative intervention to reduce the risk of musculoskeletal disorders. The benefits of job rotation have been hypothesized to occur via changes in muscular activity variability (MAV). However, the effect of job rotation on MAV has not been fully analyzed in a literature review. A wide search was conducted to identify studies testing the effect of different job rotation strategies on MAV. Twenty-six studies of acceptable quality were included. Several studies on different types of tasks supported the view that job rotation can increase muscular activity variability, particularly with strategies such as alternating tasks and pace changes. However, it remains uncertain whether such variability changes immediately translate into benefits for the worker because little evidence was found that showed simultaneous changes in different muscular groups. Additionally, variability was occasionally achieved at the expense of average activity in the assessed muscles.
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Affiliation(s)
- Andres C Rodriguez
- Pontificia Universidad Javeriana, Department of Industrial Engineering, Carrera 7 # 40-62, Bogotá, Colombia.
| | - Lope H Barrero
- Pontificia Universidad Javeriana, Department of Industrial Engineering, Carrera 7 # 40-62, Bogotá, Colombia
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Januario LB, Moreira RDFC, Cid MM, Samani A, Madeleine P, Oliveira AB. Effects of active pause pattern of surface electromyographic activity among subjects performing monotonous tasks: A systematic review. J Electromyogr Kinesiol 2016; 30:196-208. [DOI: 10.1016/j.jelekin.2016.07.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Revised: 06/27/2016] [Accepted: 07/21/2016] [Indexed: 12/31/2022] Open
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Gaudez C, Gilles MA, Savin J. Intrinsic movement variability at work. How long is the path from motor control to design engineering? APPLIED ERGONOMICS 2016; 53 Pt A:71-78. [PMID: 26674406 DOI: 10.1016/j.apergo.2015.08.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 08/27/2015] [Accepted: 08/31/2015] [Indexed: 06/05/2023]
Abstract
For several years, increasing numbers of studies have highlighted the existence of movement variability. Before that, it was neglected in movement analysis and it is still almost completely ignored in workstation design. This article reviews motor control theories and factors influencing movement execution, and indicates how intrinsic movement variability is part of task completion. These background clarifications should help ergonomists and workstation designers to gain a better understanding of these concepts, which can then be used to improve design tools. We also question which techniques--kinematics, kinetics or muscular activity--and descriptors are most appropriate for describing intrinsic movement variability and for integration into design tools. By this way, simulations generated by designers for workstation design should be closer to the real movements performed by workers. This review emphasises the complexity of identifying, describing and processing intrinsic movement variability in occupational activities.
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Affiliation(s)
- C Gaudez
- Institut national de recherche et de sécurité (INRS), 1 rue du Morvan, CS 60027, 54519 Vandoeuvre Cedex, France.
| | - M A Gilles
- Institut national de recherche et de sécurité (INRS), 1 rue du Morvan, CS 60027, 54519 Vandoeuvre Cedex, France.
| | - J Savin
- Institut national de recherche et de sécurité (INRS), 1 rue du Morvan, CS 60027, 54519 Vandoeuvre Cedex, France.
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Stock MS, Drusch AS, Thompson BJ. The minimum number of contractions required to examine the EMG amplitude versus isometric force relationship for the vastus lateralis and vastus medialis. J Electromyogr Kinesiol 2015; 24:827-34. [PMID: 25455255 DOI: 10.1016/j.jelekin.2014.10.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 09/26/2014] [Accepted: 10/01/2014] [Indexed: 10/24/2022] Open
Abstract
Studies have demonstrated that the electromyographic (EMG) amplitude versus submaximal isometric force relationship is relatively linear. The purpose of this investigation was to determine the minimum number of contractions required to study this relationship. Eighteen men (mean age = 23 years) performed isometric contractions of the leg extensors at 10-90% of the maximum voluntary contraction (MVC) in 10% increments while surface EMG signals were detected from the vastus lateralis and vastus medialis. Linear regression was used to determine the coefficient of determination, slope coefficient, and y-intercept for each muscle and force combination with successively higher levels included in the model (i.e., 10-30%,... 10-90% MVC). For the slope coefficients, there was a main effect for force combination (P < .001). The pairwise comparisons showed there was no difference from 10-60% through 10-90% MVC. For the y-intercepts, there were main effects for both muscle (vastus lateralis [4.3 μV RMS] > vastus medialis [-3.7 μV RMS]; P = .034) and force combination (P < .001), with similar values shown from 10-50% through 10-90% MVC. The linearity of the absolute EMG amplitude versus isometric force relationship for the vastus lateralis and vastus medialis suggests that investigators may exclude high force contractions from their testing protocol.
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Affiliation(s)
- Matt S Stock
- Texas Tech University, Muscular Assessment Laboratory, 3204 Main Street, TX 79409-3011, USA.
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Unilateral balance training enhances neuromuscular reactions to perturbations in the trained and contralateral limb. Gait Posture 2013; 38:894-9. [PMID: 23706505 DOI: 10.1016/j.gaitpost.2013.04.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Revised: 04/17/2013] [Accepted: 04/18/2013] [Indexed: 02/02/2023]
Abstract
The aim of this study was to investigate the effect of unilateral balance training on the reactive recovery of balance for both trained and untrained limbs. Twenty-three subjects were randomly assigned to either a control group (CG) or a training group (TG). The latter performed six weeks of balance training for the right leg. The pre- and post-training measurements were based on single leg standing posture on a moveable force platform which moved 6 cm anteriorly. TG subjects were tested on the trained (TR) and untrained leg (UTR), whereas CG subjects were tested on the right leg (CTR). The center of pressure trajectory length (CPLEN) and average speed (CPSPD) as well as onsets of muscular activation and time to peak (EMGTP) from lower limb muscles were calculated and compared by a 2-way ANOVA (three legs×two training status). Muscular onsets were reduced after training for TR (∼19 ms, p<0.05) and UTR (∼17 ms, p<0.05) with no significant changes for CTR. No effects of training for CPLEN and medial-lateral CPSPD were found. Furthermore, the EMGTP of UTR was predominantly greater before training (∼17 ms, p<0.05). However, after training the EMGTP was similar among limbs. These results suggest that concomitant with improved balance recovery and neuromuscular reactions in TR, there is also a cross-education effect in UTR, which might be predominantly related to supraspinal adaptations shared between interconnected structures in the brain.
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Rathleff M, Samani A, Olesen C, Kersting U, Madeleine P. Inverse relationship between the complexity of midfoot kinematics and muscle activation in patients with medial tibial stress syndrome. J Electromyogr Kinesiol 2011; 21:638-44. [DOI: 10.1016/j.jelekin.2011.03.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Revised: 03/04/2011] [Accepted: 03/04/2011] [Indexed: 10/18/2022] Open
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Godil SS, Shamim MS, Enam SA, Qidwai U. Fuzzy logic: A "simple" solution for complexities in neurosciences? Surg Neurol Int 2011; 2:24. [PMID: 21541006 PMCID: PMC3050069 DOI: 10.4103/2152-7806.77177] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2010] [Accepted: 01/03/2011] [Indexed: 11/24/2022] Open
Abstract
Background: Fuzzy logic is a multi-valued logic which is similar to human thinking and interpretation. It has the potential of combining human heuristics into computer-assisted decision making, which is applicable to individual patients as it takes into account all the factors and complexities of individuals. Fuzzy logic has been applied in all disciplines of medicine in some form and recently its applicability in neurosciences has also gained momentum. Methods: This review focuses on the use of this concept in various branches of neurosciences including basic neuroscience, neurology, neurosurgery, psychiatry and psychology. Results: The applicability of fuzzy logic is not limited to research related to neuroanatomy, imaging nerve fibers and understanding neurophysiology, but it is also a sensitive and specific tool for interpretation of EEGs, EMGs and MRIs and an effective controller device in intensive care units. It has been used for risk stratification of stroke, diagnosis of different psychiatric illnesses and even planning neurosurgical procedures. Conclusions: In the future, fuzzy logic has the potential of becoming the basis of all clinical decision making and our understanding of neurosciences.
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Affiliation(s)
- Saniya Siraj Godil
- Faculty of Health Sciences, Medical College, Aga Khan University, Karachi, Pakistan
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