101
|
Sun W, Zhu J, Jiang Y, Yokoi H, Huang Q. One-Channel Surface Electromyography Decomposition for Muscle Force Estimation. Front Neurorobot 2018; 12:20. [PMID: 29780317 PMCID: PMC5945831 DOI: 10.3389/fnbot.2018.00020] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 04/18/2018] [Indexed: 11/13/2022] Open
Abstract
Estimating muscle force by surface electromyography (sEMG) is a non-invasive and flexible way to diagnose biomechanical diseases and control assistive devices such as prosthetic hands. To estimate muscle force using sEMG, a supervised method is commonly adopted. This requires simultaneous recording of sEMG signals and muscle force measured by additional devices to tune the variables involved. However, recording the muscle force of the lost limb of an amputee is challenging, and the supervised method has limitations in this regard. Although the unsupervised method does not require muscle force recording, it suffers from low accuracy due to a lack of reference data. To achieve accurate and easy estimation of muscle force by the unsupervised method, we propose a decomposition of one-channel sEMG signals into constituent motor unit action potentials (MUAPs) in two steps: (1) learning an orthogonal basis of sEMG signals through reconstruction independent component analysis; (2) extracting spike-like MUAPs from the basis vectors. Nine healthy subjects were recruited to evaluate the accuracy of the proposed approach in estimating muscle force of the biceps brachii. The results demonstrated that the proposed approach based on decomposed MUAPs explains more than 80% of the muscle force variability recorded at an arbitrary force level, while the conventional amplitude-based approach explains only 62.3% of this variability. With the proposed approach, we were also able to achieve grip force control of a prosthetic hand, which is one of the most important clinical applications of the unsupervised method. Experiments on two trans-radial amputees indicated that the proposed approach improves the performance of the prosthetic hand in grasping everyday objects.
Collapse
Affiliation(s)
- Wentao Sun
- Intelligent Robotics Laboratory, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, China.,Beijing Innovation Center for Intelligent Robots and Systems, Beijing, China
| | - Jinying Zhu
- Intelligent Robotics Laboratory, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, China.,Intelligent Control Laboratory, College of Engineering, Peking University, Beijing, China
| | - Yinlai Jiang
- Beijing Innovation Center for Intelligent Robots and Systems, Beijing, China.,School of Informatics and Engineering, University of Electro-Communications, Tokyo, Japan
| | - Hiroshi Yokoi
- Beijing Innovation Center for Intelligent Robots and Systems, Beijing, China.,School of Informatics and Engineering, University of Electro-Communications, Tokyo, Japan
| | - Qiang Huang
- Beijing Innovation Center for Intelligent Robots and Systems, Beijing, China.,Key Laboratory of Biomimetic Robots and Systems, Ministry of Education, Beijing, China
| |
Collapse
|
102
|
Min K, Shin D, Lee J, Kakei S. Electromyogram refinement using muscle synergy based regulation of uncertain information. J Biomech 2018; 72:125-133. [DOI: 10.1016/j.jbiomech.2018.03.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 02/25/2018] [Accepted: 03/03/2018] [Indexed: 11/28/2022]
|
103
|
Wang K, Zhang X, Ota J, Huang Y. Estimation of Handgrip Force from SEMG Based on Wavelet Scale Selection. SENSORS 2018; 18:s18020663. [PMID: 29495248 PMCID: PMC5855185 DOI: 10.3390/s18020663] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 02/17/2018] [Accepted: 02/22/2018] [Indexed: 11/16/2022]
Abstract
This paper proposes a nonlinear correlation-based wavelet scale selection technology to select the effective wavelet scales for the estimation of handgrip force from surface electromyograms (SEMG). The SEMG signal corresponding to gripping force was collected from extensor and flexor forearm muscles during the force-varying analysis task. We performed a computational sensitivity analysis on the initial nonlinear SEMG-handgrip force model. To explore the nonlinear correlation between ten wavelet scales and handgrip force, a large-scale iteration based on the Monte Carlo simulation was conducted. To choose a suitable combination of scales, we proposed a rule to combine wavelet scales based on the sensitivity of each scale and selected the appropriate combination of wavelet scales based on sequence combination analysis (SCA). The results of SCA indicated that the scale combination VI is suitable for estimating force from the extensors and the combination V is suitable for the flexors. The proposed method was compared to two former methods through prolonged static and force-varying contraction tasks. The experiment results showed that the root mean square errors derived by the proposed method for both static and force-varying contraction tasks were less than 20%. The accuracy and robustness of the handgrip force derived by the proposed method is better than that obtained by the former methods.
Collapse
Affiliation(s)
- Kai Wang
- Guangdong Provincial Key Laboratory of Precision Equipment and Manufacturing Technology, South China University of Technology, Guangzhou 510640, China.
| | - Xianmin Zhang
- Guangdong Provincial Key Laboratory of Precision Equipment and Manufacturing Technology, South China University of Technology, Guangzhou 510640, China.
| | - Jun Ota
- Research into Artifacts, Center for Engineering, University of Tokyo, Chiba 113-8654, Japan.
| | - Yanjiang Huang
- Guangdong Provincial Key Laboratory of Precision Equipment and Manufacturing Technology, South China University of Technology, Guangzhou 510640, China.
- Research into Artifacts, Center for Engineering, University of Tokyo, Chiba 113-8654, Japan.
| |
Collapse
|
104
|
Vigotsky AD, Halperin I, Lehman GJ, Trajano GS, Vieira TM. Interpreting Signal Amplitudes in Surface Electromyography Studies in Sport and Rehabilitation Sciences. Front Physiol 2018; 8:985. [PMID: 29354060 PMCID: PMC5758546 DOI: 10.3389/fphys.2017.00985] [Citation(s) in RCA: 215] [Impact Index Per Article: 35.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2017] [Accepted: 11/17/2017] [Indexed: 12/31/2022] Open
Abstract
Surface electromyography (sEMG) is a popular research tool in sport and rehabilitation sciences. Common study designs include the comparison of sEMG amplitudes collected from different muscles as participants perform various exercises and techniques under different loads. Based on such comparisons, researchers attempt to draw conclusions concerning the neuro- and electrophysiological underpinning of force production and hypothesize about possible longitudinal adaptations, such as strength and hypertrophy. However, such conclusions are frequently unsubstantiated and unwarranted. Hence, the goal of this review is to discuss what can and cannot be inferred from comparative research designs as it pertains to both the acute and longitudinal outcomes. General methodological recommendations are made, gaps in the literature are identified, and lines for future research to help improve the applicability of sEMG are suggested.
Collapse
Affiliation(s)
- Andrew D Vigotsky
- Department of Biomedical Engineering, Northwestern University, Evanston, IL, United States
| | - Israel Halperin
- Physiology Discipline, Australian Institute of Sport, Canberra, ACT, Australia.,Centre for Exercise and Sport Science Research, School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia
| | | | - Gabriel S Trajano
- School of Exercise and Nutrition Sciences, Queensland University of Technology, Brisbane, QLD, Australia.,Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, QLD, Australia
| | - Taian M Vieira
- Laboratory for Engineering of the Neuromuscular System, Department of Electronics and Telecommunications, Politecnico di Torino, Turin, Italy
| |
Collapse
|
105
|
Baggen RJ, Van Roie E, van Dieën JH, Verschueren SM, Delecluse C. Weight bearing exercise can elicit similar peak muscle activation as medium-high intensity resistance exercise in elderly women. Eur J Appl Physiol 2018; 118:531-541. [PMID: 29290017 DOI: 10.1007/s00421-017-3793-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 12/15/2017] [Indexed: 11/28/2022]
Abstract
PURPOSE To assess whether stepping-based weight bearing exercise (WBE) can elicit peak activation of upper leg muscles similar to resistance exercise (RE) at an intensity required to induce strength gains in elderly women. METHODS Muscular activation of several upper leg muscles was measured during RE and WBE in a cohort of 19 healthy elderly women (69.3 ± 3.4 years). WBE consisted of forward and lateral stepping with step heights of 10, 20 and 30 cm. Muscular activation was compared to 60% of one-repetition maximum (1-RM) of congruent RE. RESULTS Peak activation during WBE was higher than RE at 60% 1-RM during forward and lateral stepping in vastus lateralis starting at 20 cm (p = 0.049 and p = 0.001), and biceps femoris at 30 cm step height (p = 0.024 and p = 0.030). Gluteus maximus peak activation matched RE at 60% 1-RM at 20 and 30 cm step height regardless of step direction (p ≥ 0.077). Peak activation of the rectus femoris and gluteus medius matched RE activation at 60% 1-RM during lateral stepping at 30 cm (p = 0.355 and p = 0.243, respectively) but not during forward stepping. WBE did not induce similar activation as RE in the semitendinosus. CONCLUSION In WBE, most upper leg muscles were recruited at an equal or higher intensity than in RE at 60% 1-RM. Lateral stepping at 30 cm step height showed the highest training potential of all WBE's applied.
Collapse
Affiliation(s)
- Remco J Baggen
- Department of Movement Sciences, Physical Activity, Sports and Health Research Group, KU Leuven, Tervuursevest 101, 3001, Leuven, Belgium. .,Department of Human Movement Sciences, MOVE Research Institute Amsterdam, Vrije Universiteit Amsterdam, Van der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands.
| | - Evelien Van Roie
- Department of Movement Sciences, Physical Activity, Sports and Health Research Group, KU Leuven, Tervuursevest 101, 3001, Leuven, Belgium
| | - Jaap H van Dieën
- Department of Human Movement Sciences, MOVE Research Institute Amsterdam, Vrije Universiteit Amsterdam, Van der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands
| | - Sabine M Verschueren
- Department of Rehabilitation Sciences, Research Group for Musculoskeletal Rehabilitation, KU Leuven, Tervuursevest 101, Leuven, 3001, Belgium
| | - Christophe Delecluse
- Department of Movement Sciences, Physical Activity, Sports and Health Research Group, KU Leuven, Tervuursevest 101, 3001, Leuven, Belgium
| |
Collapse
|
106
|
|
107
|
Oliveira FTM, de Oliveira CG, Monteiro WD, Farinatti P. Effects of pennation angle, electrodes orientation and knee angle on surface electromyography of vastus lateralis during isometric contractions. SPORT SCIENCES FOR HEALTH 2017. [DOI: 10.1007/s11332-017-0388-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
108
|
A model-based approach for estimation of changes in lumbar segmental kinematics associated with alterations in trunk muscle forces. J Biomech 2017; 70:82-87. [PMID: 29029957 DOI: 10.1016/j.jbiomech.2017.09.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Revised: 09/15/2017] [Accepted: 09/25/2017] [Indexed: 11/20/2022]
Abstract
The kinematics information from imaging, if combined with optimization-based biomechanical models, may provide a unique platform for personalized assessment of trunk muscle forces (TMFs). Such a method, however, is feasible only if differences in lumbar spine kinematics due to differences in TMFs can be captured by the current imaging techniques. A finite element model of the spine within an optimization procedure was used to estimate segmental kinematics of lumbar spine associated with five different sets of TMFs. Each set of TMFs was associated with a hypothetical trunk neuromuscular strategy that optimized one aspect of lower back biomechanics. For each set of TMFs, the segmental kinematics of lumbar spine was estimated for a single static trunk flexed posture involving, respectively, 40° and 10° of thoracic and pelvic rotations. Minimum changes in the angular and translational deformations of a motion segment with alterations in TMFs ranged from 0° to 0.7° and 0 mm to 0.04 mm, respectively. Maximum changes in the angular and translational deformations of a motion segment with alterations in TMFs ranged from 2.4° to 7.6° and 0.11 mm to 0.39 mm, respectively. The differences in kinematics of lumbar segments between each combination of two sets of TMFs in 97% of cases for angular deformation and 55% of cases for translational deformation were within the reported accuracy of current imaging techniques. Therefore, it might be possible to use image-based kinematics of lumbar segments along with computational modeling for personalized assessment of TMFs.
Collapse
|
109
|
Al Harrach M, Boudaoud S, Carriou V, Laforet J, Letocart AJ, Grosset JF, Marin F. Investigation of the HD-sEMG probability density function shapes with varying muscle force using data fusion and shape descriptors. Comput Biol Med 2017; 89:44-58. [PMID: 28783537 DOI: 10.1016/j.compbiomed.2017.07.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 06/26/2017] [Accepted: 07/28/2017] [Indexed: 10/19/2022]
Abstract
This work presents an evaluation of the High Density surface Electromyogram (HD-sEMG) Probability Density Function (PDF) shape variation according to contraction level. On that account, using PDF shape descriptors: High Order Statistics (HOS) and Shape Distances (SD), we try to address the absence of a consensus for the sEMG non-Gaussianity evolution with force variation. This is motivated by the fact that PDF shape information are relevant in physiological assessment of the muscle architecture and function, such as contraction level classification, in complement to classical amplitude parameters. Accordingly, both experimental and simulation studies are presented in this work. For data fusion, the watershed image processing technique was used. This technique allowed us to find the dominant PDF shape variation profiles from the 64 signals. The experimental protocol consisted of three isometric isotonic contractions of 30, 50 and 70% of the Maximum Voluntary Contraction (MVC). This protocol was performed by six subjects and recorded using an 8 × 8 HD-sEMG grid. For the simulation study, the muscle modeling was done using a fast computing cylindrical HD-sEMG generation model. This model was personalized by morphological parameters obtained by sonography. Moreover, a set of the model parameter configurations were compared as a focused sensitivity analysis of the PDF shape variation. Further, monopolar, bipolar and Laplacian electrode configurations were investigated in both experimental and simulation studies. Results indicated that sEMG PDF shape variations according to force increase are mainly dependent on the Motor Unit (MU) spatial recruitment strategy, the MU type distribution within the muscle, and the used electrode arrangement. Consequently, these statistics can give us an insight into non measurable parameters and specifications of the studied muscle primarily the MU type distribution.
Collapse
Affiliation(s)
- Mariam Al Harrach
- Sorbonne Universities, Universite de Technologie de Compiegne, CNRS UMR 7338 Biomechanics and Bioengineering, Centre de recherche Royallieu, CS 60203 Compiegne cedex, France.
| | - Sofiane Boudaoud
- Sorbonne Universities, Universite de Technologie de Compiegne, CNRS UMR 7338 Biomechanics and Bioengineering, Centre de recherche Royallieu, CS 60203 Compiegne cedex, France
| | - Vincent Carriou
- Sorbonne Universities, Universite de Technologie de Compiegne, CNRS UMR 7338 Biomechanics and Bioengineering, Centre de recherche Royallieu, CS 60203 Compiegne cedex, France
| | - Jeremy Laforet
- Sorbonne Universities, Universite de Technologie de Compiegne, CNRS UMR 7338 Biomechanics and Bioengineering, Centre de recherche Royallieu, CS 60203 Compiegne cedex, France
| | - Adrien J Letocart
- Sorbonne Universities, Universite de Technologie de Compiegne, CNRS UMR 7338 Biomechanics and Bioengineering, Centre de recherche Royallieu, CS 60203 Compiegne cedex, France
| | - Jean-François Grosset
- Sorbonne Universities, Universite de Technologie de Compiegne, CNRS UMR 7338 Biomechanics and Bioengineering, Centre de recherche Royallieu, CS 60203 Compiegne cedex, France; Universite de Paris 13, Université Sorbonne Paris Cité, UFR Health, Medicine and Human Biology, 93017 Bobigny, France
| | - Frédéric Marin
- Sorbonne Universities, Universite de Technologie de Compiegne, CNRS UMR 7338 Biomechanics and Bioengineering, Centre de recherche Royallieu, CS 60203 Compiegne cedex, France
| |
Collapse
|
110
|
Diamond LE, Van den Hoorn W, Bennell KL, Wrigley TV, Hinman RS, O'Donnell J, Hodges PW. Coordination of deep hip muscle activity is altered in symptomatic femoroacetabular impingement. J Orthop Res 2017; 35:1494-1504. [PMID: 27513847 DOI: 10.1002/jor.23391] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 08/05/2016] [Indexed: 02/04/2023]
Abstract
Diagnosis of femoroacetabular impingement (FAI) is increasing, yet the associated physical impairments remain poorly defined. This morphological hip condition can cause joint pain, stiffness, impaired function, and eventually hip osteoarthritis. This exploratory study compared coordination of deep hip muscles between people with and without symptomatic FAI using analysis of muscle synergies (i.e., patterns of activity of groups of muscles activated in synchrony) during gait. Fifteen individuals (11 males) with symptomatic FAI (clinical examination and imaging) and 14 age- and sex-comparable controls without morphological FAI underwent testing. Intramuscular fine-wire and surface electrodes recorded electromyographic activity of selected deep and superficial hip muscles. A non-negative matrix factorization algorithm extracted three synergies which were compared between groups. Information regarding which muscles were activated together in the FAI group (FAI group synergy vector) was used to reconstruct individual electromyography patterns and compare groups. Variance accounted for (VAF) by three synergies was less for the control (94.8 [1.4]%) than FAI (96.0 [1.0]%) group (p = 0.03). VAF of obturator internus was significantly higher in the FAI group (p = 0.02). VAF of the reconstructed individual electromyography patterns with the FAI or control group vector were significantly higher for the FAI group (p < 0.01). Following reconstruction, VAF of quadratus femoris was significantly more reduced in controls (p = 0.04), indicating greater between-subject variability. Coordination of deep hip muscles in the synergy related to hip joint control during early swing differed between groups. This phase involves movement towards the impingement position, which has relevance for the interpretation of synergy differences and potential clinical importance. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:1494-1504, 2017.
Collapse
Affiliation(s)
- Laura E Diamond
- Department of Physiotherapy, Center for Health, Exercise and Sports Medicine, The University of Melbourne, School of Health Sciences, 161 Barry Street, Parkville, Victoria, 3010, Australia
| | - Wolbert Van den Hoorn
- Center of Clinical Research Excellence in Spinal Pain, Injury and Health, The University of Queensland, School of Health and Rehabilitation Sciences, Brisbane, Queensland, 4072, Australia
| | - Kim L Bennell
- Department of Physiotherapy, Center for Health, Exercise and Sports Medicine, The University of Melbourne, School of Health Sciences, 161 Barry Street, Parkville, Victoria, 3010, Australia
| | - Tim V Wrigley
- Department of Physiotherapy, Center for Health, Exercise and Sports Medicine, The University of Melbourne, School of Health Sciences, 161 Barry Street, Parkville, Victoria, 3010, Australia
| | - Rana S Hinman
- Department of Physiotherapy, Center for Health, Exercise and Sports Medicine, The University of Melbourne, School of Health Sciences, 161 Barry Street, Parkville, Victoria, 3010, Australia
| | | | - Paul W Hodges
- Center of Clinical Research Excellence in Spinal Pain, Injury and Health, The University of Queensland, School of Health and Rehabilitation Sciences, Brisbane, Queensland, 4072, Australia
| |
Collapse
|
111
|
Krašna S, Đorđević S, Hribernik M, Trajkovski A. A Novel Approach to Measuring Muscle Mechanics in Vehicle Collision Conditions. SENSORS (BASEL, SWITZERLAND) 2017; 17:s17061389. [PMID: 28613265 PMCID: PMC5492481 DOI: 10.3390/s17061389] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 06/08/2017] [Accepted: 06/09/2017] [Indexed: 06/07/2023]
Abstract
The aim of the study was to evaluate a novel approach to measuring neck muscle load and activity in vehicle collision conditions. A series of sled tests were performed on 10 healthy volunteers at three severity levels to simulate low-severity frontal impacts. Electrical activity-electromyography (EMG)-and muscle mechanical tension was measured bilaterally on the upper trapezius. A novel mechanical contraction (MC) sensor was used to measure the tension on the muscle surface. The neck extensor loads were estimated based on the inverse dynamics approach. The results showed strong linear correlation (Pearson's coefficient = 0.821) between the estimated neck muscle load and the muscle tension measured with the MC sensor. The peak of the estimated neck muscle force delayed 0.2 ± 30.6 ms on average vs. the peak MC sensor signal compared to the average delay of 61.8 ± 37.4 ms vs. the peak EMG signal. The observed differences in EMG and MC sensor collected signals indicate that the MC sensor offers an additional insight into the analysis of the neck muscle load and activity in impact conditions. This approach enables a more detailed assessment of the muscle-tendon complex load of a vehicle occupant in pre-impact and impact conditions.
Collapse
Affiliation(s)
- Simon Krašna
- Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva cesta 6, 1000 Ljubljana, Slovenia.
| | - Srđan Đorđević
- TMG-BMC d.o.o., Štihova ulica 24, 1000 Ljubljana, Slovenia.
| | - Marija Hribernik
- Faculty of Medicine, University of Ljubljana, Korytkova ulica 2, 1000 Ljubljana, Slovenia.
| | - Ana Trajkovski
- Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva cesta 6, 1000 Ljubljana, Slovenia.
| |
Collapse
|
112
|
Johnson RE, Kording KP, Hargrove LJ, Sensinger JW. EMG Versus Torque Control of Human–Machine Systems: Equalizing Control Signal Variability Does not Equalize Error or Uncertainty. IEEE Trans Neural Syst Rehabil Eng 2017; 25:660-667. [DOI: 10.1109/tnsre.2016.2598095] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
113
|
Zhang Q, Liu R, Chen W, Xiong C. Simultaneous and Continuous Estimation of Shoulder and Elbow Kinematics from Surface EMG Signals. Front Neurosci 2017; 11:280. [PMID: 28611573 PMCID: PMC5447720 DOI: 10.3389/fnins.2017.00280] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 05/01/2017] [Indexed: 11/20/2022] Open
Abstract
In this paper, we present a simultaneous and continuous kinematics estimation method for multiple DoFs across shoulder and elbow joint. Although simultaneous and continuous kinematics estimation from surface electromyography (EMG) is a feasible way to achieve natural and intuitive human-machine interaction, few works investigated multi-DoF estimation across the significant joints of upper limb, shoulder and elbow joints. This paper evaluates the feasibility to estimate 4-DoF kinematics at shoulder and elbow during coordinated arm movements. Considering the potential applications of this method in exoskeleton, prosthetics and other arm rehabilitation techniques, the estimation performance is presented with different muscle activity decomposition and learning strategies. Principle component analysis (PCA) and independent component analysis (ICA) are respectively employed for EMG mode decomposition with artificial neural network (ANN) for learning the electromechanical association. Four joint angles across shoulder and elbow are simultaneously and continuously estimated from EMG in four coordinated arm movements. By using ICA (PCA) and single ANN, the average estimation accuracy 91.12% (90.23%) is obtained in 70-s intra-cross validation and 87.00% (86.30%) is obtained in 2-min inter-cross validation. This result suggests it is feasible and effective to use ICA (PCA) with single ANN for multi-joint kinematics estimation in variant application conditions.
Collapse
Affiliation(s)
- Qin Zhang
- The State Key Laboratory of Digital Manufacturing Equipment and Technology, Institute of Rehabilitation and Medical Robotics, Huazhong University of Science and TechnologyWuhan, China
| | - Runfeng Liu
- The State Key Laboratory of Digital Manufacturing Equipment and Technology, Institute of Rehabilitation and Medical Robotics, Huazhong University of Science and TechnologyWuhan, China
| | - Wenbin Chen
- The State Key Laboratory of Digital Manufacturing Equipment and Technology, Institute of Rehabilitation and Medical Robotics, Huazhong University of Science and TechnologyWuhan, China
| | - Caihua Xiong
- The State Key Laboratory of Digital Manufacturing Equipment and Technology, Institute of Rehabilitation and Medical Robotics, Huazhong University of Science and TechnologyWuhan, China
| |
Collapse
|
114
|
Chandrapal M, Chen X, Wang W, Stanke B, Pape NL. Preliminary Evaluation of Intelligent Intention Estimation Algorithms for an Actuated Lower-Limb Exoskeleton. INT J ADV ROBOT SYST 2017. [DOI: 10.5772/56063] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Mervin Chandrapal
- Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand
| | - XiaoQi Chen
- Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand
| | - Wenhui Wang
- Department of Precision Instruments, Tsinghua University, Beijing, China
| | - Benjamin Stanke
- School of Biomimetics, University of Applied Sciences, Factorial 5: Nature and Engineering, Bremen, Germany
| | - Nicolas Le Pape
- Ecole Nationale Supérieure d'Ingénieurs de Limoges, Parc ESTER Technopole, Limoges, France
| |
Collapse
|
115
|
Robertson JW, Johnston JA. Modifying motor unit territory placement in the Fuglevand model. Med Biol Eng Comput 2017; 55:2015-2025. [PMID: 28390003 DOI: 10.1007/s11517-017-1645-7] [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] [Received: 03/27/2016] [Accepted: 03/25/2017] [Indexed: 10/19/2022]
Abstract
The Fuglevand model is often used to address challenging questions in neurophysiology; however, there are elements of the neuromuscular system unaccounted for in the model. For instance, in some muscles, slow and fast motor units (MUs) tend to reside deep and superficially in the muscle, respectively, necessarily altering the development of surface electromyogram (EMG) power during activation. Thus, the objective of this study was to replace the randomized MU territory (MUT) placement algorithm in the Fuglevand model with an optimized method capable of reflecting these observations. To accomplish this, a weighting term was added to a previously developed optimization algorithm to encourage regionalized MUT placement. The weighting term consequently produced significantly different muscle fibre type content in the deep and superficial portions of the muscle. The relation between simulated EMG and muscle force was found to be significantly affected by regionalization. These changes were specifically a function of EMG power, as force was unaffected by regionalization. These findings suggest that parameterizing MUT regionalization will allow the model to produce a larger variety of EMG-force relations, as is observed physiologically, and could potentially simulate the loss of specific MU types as observed in ageing and clinical populations.
Collapse
Affiliation(s)
- Jason W Robertson
- Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada. .,Biomedical Engineering Graduate Program, University of Calgary, Calgary, AB, Canada. .,Institute of Biomedical Engineering, University of New Brunswick, 25 Dineen Dr., Fredericton, NB, E3B 5A3, Canada.
| | - Jamie A Johnston
- Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada.,Biomedical Engineering Graduate Program, University of Calgary, Calgary, AB, Canada
| |
Collapse
|
116
|
Na Y, Kim J. Dynamic Elbow Flexion Force Estimation Through a Muscle Twitch Model and sEMG in a Fatigue Condition. IEEE Trans Neural Syst Rehabil Eng 2017; 25:1431-1439. [PMID: 28113944 DOI: 10.1109/tnsre.2016.2628373] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We propose a joint force estimation method to compute elbow flexion force using surface electromyogram (sEMG) considering time-varying effects in a fatigue condition. Muscle fatigue is a major cause inducing sEMG changes with respect to time over long periods and repetitive contractions. The proposed method composed the muscle-twitch model representing the force generated by a single spike and the spikes extracted from sEMG. In this study, isometric contractions at six different joint angles (10 subjects) and dynamic contractions with constant velocity (six subjects) were performed under non-fatigue and fatigue conditions. Performance of the proposed method was evaluated and compared with that of previous methods using mean absolute value (MAV). The proposed method achieved average 6.7 ± 2.8 %RMSE for isometric contraction and 15.6 ± 24.7%RMSE for isokinetic contraction under fatigue condition with more accurate results than the previous methods.
Collapse
|
117
|
Dai C, Bardizbanian B, Clancy EA. Comparison of Constant-Posture Force-Varying EMG-Force Dynamic Models About the Elbow. IEEE Trans Neural Syst Rehabil Eng 2016; 25:1529-1538. [PMID: 28113322 DOI: 10.1109/tnsre.2016.2639443] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Numerous techniques have been used to minimize error in relating the surface electromyogram (EMG) to elbow joint torque. We compare the use of three techniques to further reduce error. First, most EMG-torque models only use estimates of EMG standard deviation as inputs. We studied the additional features of average waveform length, slope sign change rate and zero crossing rate. Second, multiple channels of EMG from the biceps, and separately from the triceps, have been combined to produce two low-variance model inputs. We contrasted this channel combination with using each EMG separately. Third, we previously modeled nonlinearity in the EMG-torque relationship via a polynomial. We contrasted our model versus that of the classic exponential power law of Vredenbregt and Rau (1973). Results from 65 subjects performing constant-posture, force-varying contraction gave a "baseline" comparison error (i.e., error with none of the new techniques) of 5.5 ± 2.3% maximum flexion voluntary contraction (%MVCF). Combining the techniques of multiple features with individual channels reduced error to 4.8 ± 2.2 %MVCF, while combining individual channels with the power-law model reduced error to 4.7 ± 2.0 %MVCF. The new techniques further reduced error from that of the baseline by ≈ 15 %.
Collapse
|
118
|
Selective activation of lower leg muscles during maximum voluntary isometric contractions. Hum Mov Sci 2016; 50:30-37. [DOI: 10.1016/j.humov.2016.10.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Revised: 09/02/2016] [Accepted: 10/03/2016] [Indexed: 12/26/2022]
|
119
|
Xu L, Rabotti C, Mischi M. Towards Real-Time Estimation of Muscle-Fiber Conduction Velocity Using Delay-Locked Loop. IEEE Trans Neural Syst Rehabil Eng 2016; 25:1453-1460. [PMID: 27898382 DOI: 10.1109/tnsre.2016.2632755] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Decrease in muscle-fiber conduction velocity (MFCV) during sustained contraction has been widely accepted as myoelectric manifestation of muscle fatigue. Several methods have been proposed in the literature for MFCV estimation by analysing surface electromyography (EMG), e.g., cross-correlation (CC) function and maximum likelihood (ML). However, for all the availablemethods, windowing of the EMG signal and computationally demanding calculations are required, limiting the possibility to continuously monitor muscle fatigue in real time. In the present study, an adaptive scheme is proposed that permits real-time estimation of MFCV. The proposed scheme is based on a delay-lockedloop (DLL). Asecond-orderloop is adopted to track the delay variationover time. An error filter is employed to approximate a ML estimation in case of colored noise. Furthermore, the DLL system is extended for multichannel CV estimation. The performance of the proposed method is evaluated by both dedicated simulations and real EMG signals. Our results show the accuracy of the proposed method to be comparable to that of theML method formuch lower (1/40) computational complexity, especially suited for real-time MFCV measurements. Use of this method can enable new studies onmyoelectric fatigue, possibly leading to new insight on the underlying physiological processes.
Collapse
|
120
|
Haberfehlner H, Jaspers RT, Rutz E, Becher JG, Harlaar J, van der Sluijs JA, Witbreuk MM, Romkes J, Freslier M, Brunner R, Maas H, Buizer AI. Knee Moment-Angle Characteristics and Semitendinosus Muscle Morphology in Children with Spastic Paresis Selected for Medial Hamstring Lengthening. PLoS One 2016; 11:e0166401. [PMID: 27861523 PMCID: PMC5115739 DOI: 10.1371/journal.pone.0166401] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 10/30/2016] [Indexed: 11/18/2022] Open
Abstract
To increase knee range of motion and improve gait in children with spastic paresis (SP), the semitendinosus muscle (ST) amongst other hamstring muscles is frequently lengthened by surgery, but with variable success. Little is known about how the pre-surgical mechanical and morphological characteristics of ST muscle differ between children with SP and typically developing children (TD). The aims of this study were to assess (1) how knee moment-angle characteristics and ST morphology in children with SP selected for medial hamstring lengthening differ from TD children, as well as (2) how knee moment-angle characteristics and ST morphology are related. In nine SP and nine TD children, passive knee moment-angle characteristics and morphology of ST (i.e. fascicle length, muscle belly length, tendon length, physiological cross-sectional area, and volume) were assessed by hand-held dynamometry and freehand 3D ultrasound, respectively. At net knee flexion moments above 0.5 Nm, more flexed knee angles were found for SP compared to TD children. The measured knee angle range between 0 and 4 Nm was 30% smaller in children with SP. Muscle volume, physiological cross-sectional area, and fascicle length normalized to femur length were smaller in SP compared to TD children (62%, 48%, and 18%, respectively). Sixty percent of the variation in knee angles at 4 Nm net knee moment was explained by ST fascicle length. Altered knee moment-angle characteristics indicate an increased ST stiffness in SP children. Morphological observations indicate that in SP children planned for medial hamstring lengthening, the longitudinal and cross-sectional growth of ST muscle fibers is reduced. The reduced fascicle length can partly explain the increased ST stiffness and, hence, a more flexed knee joint in these SP children.
Collapse
Affiliation(s)
- Helga Haberfehlner
- Laboratory for Myology, Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit, Amsterdam, The Netherlands
- Department of Rehabilitation Medicine, VU University Medical Center, Amsterdam, The Netherlands
- MOVE Research Institute Amsterdam, The Netherlands
| | - Richard T. Jaspers
- Laboratory for Myology, Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit, Amsterdam, The Netherlands
- MOVE Research Institute Amsterdam, The Netherlands
- * E-mail:
| | - Erich Rutz
- Pediatric Orthopaedic Department, University Children’s Hospital Basle (UKBB), Basle, Switzerland
- Laboratory for Movement Analysis, University Children's Hospital Basle (UKBB), Basle, Switzerland
| | - Jules G. Becher
- Department of Rehabilitation Medicine, VU University Medical Center, Amsterdam, The Netherlands
- MOVE Research Institute Amsterdam, The Netherlands
| | - Jaap Harlaar
- Department of Rehabilitation Medicine, VU University Medical Center, Amsterdam, The Netherlands
- MOVE Research Institute Amsterdam, The Netherlands
| | - Johannes A. van der Sluijs
- MOVE Research Institute Amsterdam, The Netherlands
- Department of Orthopaedic Surgery, VU University Medical Center, Amsterdam, The Netherlands
| | - Melinda M. Witbreuk
- MOVE Research Institute Amsterdam, The Netherlands
- Department of Orthopaedic Surgery, VU University Medical Center, Amsterdam, The Netherlands
| | - Jacqueline Romkes
- Laboratory for Movement Analysis, University Children's Hospital Basle (UKBB), Basle, Switzerland
| | - Marie Freslier
- Laboratory for Movement Analysis, University Children's Hospital Basle (UKBB), Basle, Switzerland
| | - Reinald Brunner
- Pediatric Orthopaedic Department, University Children’s Hospital Basle (UKBB), Basle, Switzerland
- Laboratory for Movement Analysis, University Children's Hospital Basle (UKBB), Basle, Switzerland
| | - Huub Maas
- Laboratory for Myology, Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit, Amsterdam, The Netherlands
- MOVE Research Institute Amsterdam, The Netherlands
| | - Annemieke I. Buizer
- Department of Rehabilitation Medicine, VU University Medical Center, Amsterdam, The Netherlands
- MOVE Research Institute Amsterdam, The Netherlands
| |
Collapse
|
121
|
Botter A, Vieira TM. Filtered Virtual Reference: A New Method for the Reduction of Power Line Interference With Minimal Distortion of Monopolar Surface EMG. IEEE Trans Biomed Eng 2016; 62:2638-47. [PMID: 26513767 DOI: 10.1109/tbme.2015.2438335] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
GOAL This study tests and validates a new method to remove power line interference from monopolar EMGs detected by multichannel systems: the filtered virtual reference (FVR). FVR is an adaptation of the virtual reference (VR) method, which consists in referencing signals detected by each electrode in a grid to their spatial average. Signals may however be distorted with the VR approach, in particular when the skin region where the detection system is positioned does not cover the entire muscle. METHODS Simulated and experimental EMGs were used to compare the performance of FVR and VR in terms of interference reduction and distortion of monopolar signals referred to a remote reference. RESULTS Simulated data revealed the monopolar EMG signals processed with FVR were significantly less distorted than those filtered by VR. These results were similarly observed for experimental signals. Moreover, FVR method outperformed VR in removing power line interference when it was distributed unevenly across the signals of the grid. CONCLUSION Key results demonstrated that FVR improves the VR method as it reduces interference while preserving the information content of monopolar signals. SIGNIFICANCE Although the actual distribution of motor unit action potential is represented in monopolar EMGs, collecting high quality monopolar signals is challenging. This study presents a possible solution to this issue; FVR provides undistorted monopolar signals with negligible interference and is insensitive to muscle architecture. It is therefore relevant for EMG applications benefiting from a clean monopolar detection (e.g., decomposition, control of prosthetic devices, motor unit number estimation).
Collapse
|
122
|
Extracorporeal Shock Wave Stimulation as Alternative Treatment Modality for Wrist and Fingers Spasticity in Poststroke Patients: A Prospective, Open-Label, Preliminary Clinical Trial. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2016; 2016:4648101. [PMID: 27504139 PMCID: PMC4967701 DOI: 10.1155/2016/4648101] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 05/13/2016] [Accepted: 06/08/2016] [Indexed: 12/18/2022]
Abstract
Objective. To evaluate the effectiveness of radial shock waves (rESW) for wrist and fingers flexors spasticity in stroke patients. Methods. Twenty patients with upper limb muscle spasticity were enrolled in the study and treated with a single session of rESW. The spasticity level of the radio carpal (RC) and finger (FF) joints was assessed using Modified Ashworth Scale (MAS). The resting bioelectrical activity of the flexor carpi radialis (FCR) and flexor carpi ulnaris (FCU) was examined using surface electromyography (sEMG). Trophic conditions were measured using infrared thermal (IRT) imaging. All measurements were conducted at baseline (t0), immediately after rESW (t1), and 1 (t2) and 24 (t3) hours following rESW. Results. Significant reduction in MAS was observed for the RC joint in t1, as well as for the FF joints in t1, t2, and t3. A significant decrease in sEMG was shown for the FCR muscle in t1 and t2, as well as for the FCU muscle in t1 and t3. Also, a significant increase in IRT value was observed in t3 only. Conclusions. A single session of rESW could be an effective alternative treatment for reduction of limb spasticity and could lead to improvement of trophic conditions of the spastic muscles.
Collapse
|
123
|
Asefi M, Moghimi S, Kalani H, Moghimi A. Dynamic modeling of SEMG–force relation in the presence of muscle fatigue during isometric contractions. Biomed Signal Process Control 2016. [DOI: 10.1016/j.bspc.2016.04.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
124
|
Kolk S, Klawer EME, Schepers J, Weerdesteyn V, Visser EP, Verdonschot N. Muscle Activity during Walking Measured Using 3D MRI Segmentations and [18F]-Fluorodeoxyglucose in Combination with Positron Emission Tomography. Med Sci Sports Exerc 2016; 47:1896-905. [PMID: 25551402 DOI: 10.1249/mss.0000000000000607] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PURPOSE This study aimed to determine the contribution of each muscle of the lower limb to walking using positron emission tomography (PET) with [F]-fluorodeoxyglucose (FDG). Furthermore, we compared our results obtained using volumetric analysis of entire muscles with those obtained using a more traditional approach considering the uptake in only one slice in each segment. METHODS Ten healthy subjects walked on a treadmill at self-selected comfortable walking speed for 90 min, 60 min before and 30 min after intravenous injection of 50-MBq FDG. A PET/computerized tomography scan of the lower limb was made subsequently. The three-dimensional contours of 39 muscles in the left lower limb were semiautomatically determined from magnetic resonance imaging scans. After nonrigidly registering the magnetic resonance imaging to the computerized tomography scans, we superimposed the muscle contours on the PET scans. RESULTS The muscles with the highest median FDG uptake among all subjects were the soleus, gluteus maximus, vastus lateralis, gastrocnemius medialis, and adductor magnus. We found a wide range of FDG uptake values among subjects, including in some of the most important muscles involved in walking (e.g., soleus, gluteus medius, gastrocnemius medialis). Compared with the volumetric analysis, the single slice analysis did not yield an accurate estimate of the FDG uptake in many of the most active muscles, including the gluteus medius and minimus (overestimated) as well as all the thigh muscles (underestimated). CONCLUSIONS The distribution of FDG among the muscles varied between subjects, suggesting that each subject had a unique activation pattern. The FDG uptake as estimated from single slices did not correspond well to the uptake obtained from volumetric analysis, which illustrates the added value of our novel three-dimensional image analysis techniques.
Collapse
Affiliation(s)
- Sjoerd Kolk
- 1Department of Rehabilitation, Donders Center for Neuroscience, Radboud University Medical Center, Nijmegen, THE NETHERLANDS; 2Laboratory for Biomechanical Engineering, MIRA Institute, University of Twente, Enschede, THE NETHERLANDS; 3Materialise N.V., Leuven, BELGIUM; 4Sint Maartenskliniek Research, Nijmegen, THE NETHERLANDS; 5Department of Nuclear Medicine, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, THE NETHERLANDS; and 6Orthopaedic Research Laboratory, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, THE NETHERLANDS
| | | | | | | | | | | |
Collapse
|
125
|
Jordanic M, Rojas-Martínez M, Mañanas MA, Alonso JF. Spatial distribution of HD-EMG improves identification of task and force in patients with incomplete spinal cord injury. J Neuroeng Rehabil 2016; 13:41. [PMID: 27129309 PMCID: PMC4850704 DOI: 10.1186/s12984-016-0151-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2015] [Accepted: 04/22/2016] [Indexed: 11/13/2022] Open
Abstract
Background Recent studies show that spatial distribution of High Density surface EMG maps (HD-EMG) improves the identification of tasks and their corresponding contraction levels. However, in patients with incomplete spinal cord injury (iSCI), some nerves that control muscles are damaged, leaving some muscle parts without an innervation. Therefore, HD-EMG maps in patients with iSCI are affected by the injury and they can be different for every patient. The objective of this study is to investigate the spatial distribution of intensity in HD-EMG recordings to distinguish co-activation patterns for different tasks and effort levels in patients with iSCI. These patterns are evaluated to be used for extraction of motion intention. Method HD-EMG was recorded in patients during four isometric tasks of the forearm at three different effort levels. A linear discriminant classifier based on intensity and spatial features of HD-EMG maps of five upper-limb muscles was used to identify the attempted tasks. Task and force identification were evaluated for each patient individually, and the reliability of the identification was tested with respect to muscle fatigue and time interval between training and identification. Results Three feature sets were analyzed in the identification: 1) intensity of the HD-EMG map, 2) intensity and center of gravity of HD-EMG maps and 3) intensity of a single differential EMG channel (gold standard). Results show that the combination of intensity and spatial features in classification identifies tasks and effort levels properly (Acc = 98.8 %; S = 92.5 %; P = 93.2 %; SP = 99.4 %) and outperforms significantly the other two feature sets (p < 0.05). Conclusion In spite of the limited motor functionality, a specific co-activation pattern for each patient exists for both intensity, and spatial distribution of myoelectric activity. The spatial distribution is less sensitive than intensity to myoelectric changes that occur due to fatigue, and other time-dependent influences.
Collapse
Affiliation(s)
- Mislav Jordanic
- Department of Automatic Control (ESAII), Biomedical Engineering Research Centre (CREB), Technical University of Catalonia UPC, Barcelona, Spain. .,Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain.
| | - Mónica Rojas-Martínez
- Department of Automatic Control (ESAII), Biomedical Engineering Research Centre (CREB), Technical University of Catalonia UPC, Barcelona, Spain.,Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain
| | - Miguel Angel Mañanas
- Department of Automatic Control (ESAII), Biomedical Engineering Research Centre (CREB), Technical University of Catalonia UPC, Barcelona, Spain.,Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain
| | - Joan Francesc Alonso
- Department of Automatic Control (ESAII), Biomedical Engineering Research Centre (CREB), Technical University of Catalonia UPC, Barcelona, Spain.,Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain
| |
Collapse
|
126
|
Perception of Muscular Effort During Dynamic Elbow Extension in Multiple Sclerosis. Arch Phys Med Rehabil 2016; 97:252-8. [DOI: 10.1016/j.apmr.2015.10.082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 09/30/2015] [Accepted: 10/05/2015] [Indexed: 11/23/2022]
|
127
|
Zhang S, Guo S, Gao B, Huang Q, Pang M, Hirata H, Ishihara H. Muscle Strength Assessment System Using sEMG-Based Force Prediction Method for Wrist Joint. J Med Biol Eng 2016. [DOI: 10.1007/s40846-016-0112-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
128
|
Johns G, Morin E, Hashtrudi-Zaad K. Force Modelling of Upper Limb Biomechanics Using Ensemble Fast Orthogonal Search on High-Density Electromyography. IEEE Trans Neural Syst Rehabil Eng 2016; 24:1041-1050. [PMID: 26761839 DOI: 10.1109/tnsre.2016.2515087] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
An important quality of upper limb force estimation is the repeatability and worst-case performance of the estimator. The following paper proposes a methodology using an ensemble learning technique coupled with the fast orthogonal search (FOS) algorithm to reliably predict varying isometric contractions of the right arm. This method leverages the rapid and precise modelling offered by FOS combined with a univariate outlier detection algorithm to dynamically combine the output of numerous FOS models. This is performed using high-density surface electromyography (HD-SEMG) obtained from three upper-arm muscles, the biceps brachii, triceps brachii and brachioradialis. This method offers improved performance over other HD-SEMG and SEMG based force estimators, with a substantial reduction in the number of channels required.
Collapse
|
129
|
Cremoux S, Amarantini D, Tallet J, Dal Maso F, Berton E. Increased antagonist muscle activity in cervical SCI patients suggests altered reciprocal inhibition during elbow contractions. Clin Neurophysiol 2016; 127:629-634. [DOI: 10.1016/j.clinph.2015.03.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 03/03/2015] [Accepted: 03/31/2015] [Indexed: 10/23/2022]
|
130
|
Na Y, Choi C, Lee HD, Kim J. A Study on Estimation of Joint Force Through Isometric Index Finger Abduction With the Help of SEMG Peaks for Biomedical Applications. IEEE TRANSACTIONS ON CYBERNETICS 2016; 46:2-8. [PMID: 25594990 DOI: 10.1109/tcyb.2014.2386856] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We propose a new method to estimate joint force using a biomechanical muscle model and peaks of surface electromyography (SEMG). The SEMG measurement was carried out from the first dorsal interosseous muscle during isometric index finger abduction. The SEMG peaks were used as the input of the biomechanical muscle model which is a transfer function to generate the force. The force estimation performance ( R(2) ) was evaluated using the proposed method with nine healthy subjects, and a former method using a mean absolute value (MAV), which is the full-wave rectified and averaged (or low-pass filtered) signal of SEMG in a time window, was compared with the proposed method; the performance of the proposed method (0.94 ± 0.03) was better than that of MAV (0.90 ± 0.02). The proposed method could be widely applied to quantitative analysis of muscle activities based on SEMG.
Collapse
|
131
|
Musculoskeletal Simulation for Assessment of Effect of Movement-Based Structure-Modifying Treatment Strategies. ACTA ACUST UNITED AC 2015. [DOI: 10.1155/2015/939480] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The better understanding of the complex mechanism between neural motor control and its resulting joint kinematics and muscle forces allows a better elucidation of the mechanisms behind body growth, aging progression, and disease development. This study aimed at investigating the impact of movement-based structure-modifying treatment strategies on joint kinematics, muscle forces, and muscle synergies of the gait with instrumented implant. A patient-specific musculoskeletal model was used to quantitatively assess the deviations of joint and muscle behaviors between the normal gait and 4 gait modifications (bouncy, medial thrust, midcrouch, and mtp (i.e., gait with forefoot strike)). Moreover, muscle synergy analysis was performed using EMG-based nonnegative matrix factorization. Large variation of 19 degrees and 190 N was found for knee flexion/extension and lower limb muscle forces, respectively. EMG-based muscle synergy analysis revealed that the activation levels of the vastus lateralis and tibialis anterior are dominant for the midcrouch gait. In addition, an important contribution of semimembranosus to the medial thrust and midcrouch gaits was also observed. In fact, such useful information could allow a better understanding of the joint function and muscle synergy strategies leading to deeper knowledge of joint and muscle mechanisms related to neural voluntary motor commands.
Collapse
|
132
|
Ruiz Muñoz M, González-Sánchez M, Cuesta-Vargas AI. Tibialis anterior analysis from functional and architectural perspective during isometric foot dorsiflexion: a cross-sectional study of repeated measures. J Foot Ankle Res 2015; 8:74. [PMID: 26688692 PMCID: PMC4684620 DOI: 10.1186/s13047-015-0132-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Accepted: 12/15/2015] [Indexed: 11/10/2022] Open
Abstract
Background The purpose of the present study is to establish the relationship and degree of contribution between torque and sonomiography variables (pennation angle – muscle thickness), and electromyography variables (EMGAreaUnderCurve – EMGMaximalPeak) of the tibialis anterior muscle during (TA) maximal and relative isometric foot dorsiflexion (IFD). Secondary aim: To determine the measurement’s reliability. Methods Cross-sectional study. 31 participants (15 men; 16 women) performed IFD at different intensities (100, 75, 50, and 25 %) of the maximal voluntary contraction (MVC) (three times for each intensity). Outcome variables: To determine the torque, pennation angle, muscle thickness, EMGMaximalPeak, and EMGAreaUnderCurve. Statistical analysis: In order to test the measurement’s reliability, Cronbach’s alpha and standard error of the measurement were determined. An inferential analysis was carried out using Pearson correlations(r). For each contraction intensity, a multiple regression analysis was performed, where the dependent variable was torque and the independent variables were EMGAreaUnderCurve, EMGMaximalPeak, muscle thickness and pennation angle. Results All outcome variables show excellent reliability. The highest correlation value was 0.955 (thickness 100 % – thickness 25 %). R2 values ranged from 0.713 (100 % MVC) to 0.588 (25 % MVC). Conclusion The outcome variables demonstrated excellent reliability in terms of measuring IFD at different intensities. The correlations between all outcome variables were moderate-to-strong. TA functional and architectural variables have a significant impact on the torque variance during IFD at different intensities.
Collapse
Affiliation(s)
- Maria Ruiz Muñoz
- Departamento de Enfermería y Podología, Instituto de Investigación Biomédica de Málaga (IBIMA), Universidad de Málaga, Málaga, Spain
| | - Manuel González-Sánchez
- Departamento Ciencias de la Salud. Instituto de Investigación Biomédica de Málaga (IBIMA), Universidad de Jaén, Málaga, Spain
| | - Antonio I Cuesta-Vargas
- Departamento de Fisioterapia, Facultd de Ciencias de la Salud, Instituto de Investigacion Biomedica de Malaga (IBIMA), Grupo Clinimetria F-14 Universidad de Malaga, Andalucia Tech, Malaga, Spain ; School of Clinical Sciences at Queensland University, Brisbane, Australia
| |
Collapse
|
133
|
A Hertzian Integrated Contact Model of the Total Knee Replacement Implant for the Estimation of Joint Contact Forces. ACTA ACUST UNITED AC 2015. [DOI: 10.1155/2015/945379] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The prediction of lower limb muscle and contact forces may provide useful knowledge to assist the clinicians in the diagnosis as well as in the development of appropriate treatment for musculoskeletal disorders. Research studies have commonly estimated joint contact forces using model-based muscle force estimation due to the lack of a reliable contact model and material properties. The objective of this present study was to develop a Hertzian integrated contact model. Then, in vivo elastic properties of the Total Knee Replacement (TKR) implant were identified using in vivo contact forces leading to providing reliable material properties for modeling purposes. First, a patient specific rigid musculoskeletal model was built. Second, a STL-based implant model was designed to compute the contact area evolutions during gait motions. Finally, a Hertzian integrated contact model was defined for the in vivo identification of elastic properties (Young’s modulus and Poisson coefficient) of the instrumented TKR implant. Our study showed a potential use of a new approach to predict the contact forces without knowledge of muscle forces. Thus, the outcomes may lead to accurate and reliable prediction of human joint contact forces for new case study.
Collapse
|
134
|
Abstract
Sensory events in the space around us trigger specific motor patterns directed toward or away from the spatial location of the sensory source. Spatially-defined sensorimotor associations are well-known in the visual domain but less so for the auditory modality. In particular no spatially-directed audio-motor association has been described for the upper limb. We tested the instantaneous directional tuning of the corticospinal system by means of single-pulse transcranial magnetic stimulation (TMS) over the left motor cortex in 16 healthy volunteers while at rest. We recorded the lateral accelerations of the TMS-evoked movement by means of an accelerometer placed on the forearm. Acoustic stimuli (pure tone frequency=1000Hz, duration=50ms) coming from 25 different directions lying in the axial anterior half-plane at the height of the participant's ears were played on earphones. The entire set of sound directions covered a span of 160° (±80° where 0° is the frontal direction) at a fixed azimuth angle. Six different intervals between sound onset and TMS (0, 25, 50, 100, 150 and 200ms) were tested for each sound direction. Significant correlations were found between sound origin and TMS-evoked arm accelerations only when TMS was delivered 50ms prior to sound onset. We show the presence in the upper limb motor system of auditory spatial tuning. Sound information accesses the motor system at very short latency, potentially compatible with both a subcortical and a cortical origin of the response. The use of TMS-evoked accelerations allowed us to disclose a strict directional tuning in audio-motor associations.
Collapse
Affiliation(s)
- L Cattaneo
- Center for Mind/Brain Sciences (CIMeC), University of Trento, Italy.
| | - G Barchiesi
- Center for Mind/Brain Sciences (CIMeC), University of Trento, Italy
| |
Collapse
|
135
|
Piitulainen H, Botter A, Bourguignon M, Jousmäki V, Hari R. Spatial variability in cortex-muscle coherence investigated with magnetoencephalography and high-density surface electromyography. J Neurophysiol 2015; 114:2843-53. [PMID: 26354317 DOI: 10.1152/jn.00574.2015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 09/04/2015] [Indexed: 11/22/2022] Open
Abstract
Cortex-muscle coherence (CMC) reflects coupling between magnetoencephalography (MEG) and surface electromyography (sEMG), being strongest during isometric contraction but absent, for unknown reasons, in some individuals. We used a novel nonmagnetic high-density sEMG (HD-sEMG) electrode grid (36 mm × 12 mm; 60 electrodes separated by 3 mm) to study effects of sEMG recording site, electrode derivation, and rectification on the strength of CMC. Monopolar sEMG from right thenar and 306-channel whole-scalp MEG were recorded from 14 subjects during 4-min isometric thumb abduction. CMC was computed for 60 monopolar, 55 bipolar, and 32 Laplacian HD-sEMG derivations, and two derivations were computed to mimic "macroscopic" monopolar and bipolar sEMG (electrode diameter 9 mm; interelectrode distance 21 mm). With unrectified sEMG, 12 subjects showed statistically significant CMC in 91-95% of the HD-sEMG channels, with maximum coherence at ∼25 Hz. CMC was about a fifth stronger for monopolar than bipolar and Laplacian derivations. Monopolar derivations resulted in most uniform CMC distributions across the thenar and in tightest cortical source clusters in the left rolandic hand area. CMC was 19-27% stronger for HD-sEMG than for "macroscopic" monopolar or bipolar derivations. EMG rectification reduced the CMC peak by a quarter, resulted in a more uniformly distributed CMC across the thenar, and provided more tightly clustered cortical sources than unrectifed sEMGs. Moreover, it revealed CMC at ∼12 Hz. We conclude that HD-sEMG, especially with monopolar derivation, can facilitate detection of CMC and that individual muscle anatomy cannot explain the high interindividual CMC variability.
Collapse
Affiliation(s)
- Harri Piitulainen
- Brain Research Unit, Department of Neuroscience and Biomedical Engineering, and MEG Core and Advanced Magnetic Imaging (AMI) Centre, Aalto NeuroImaging, Aalto University School of Science, Aalto, Espoo, Finland; and
| | - Alberto Botter
- Laboratory of Engineering of Neuromuscular System and Motor Rehabilitation, Dipartimento di Elettronica e Telecomunicazioni, Politecnico di Torino, Turin, Italy
| | - Mathieu Bourguignon
- Brain Research Unit, Department of Neuroscience and Biomedical Engineering, and MEG Core and Advanced Magnetic Imaging (AMI) Centre, Aalto NeuroImaging, Aalto University School of Science, Aalto, Espoo, Finland; and
| | - Veikko Jousmäki
- Brain Research Unit, Department of Neuroscience and Biomedical Engineering, and MEG Core and Advanced Magnetic Imaging (AMI) Centre, Aalto NeuroImaging, Aalto University School of Science, Aalto, Espoo, Finland; and
| | - Riitta Hari
- Brain Research Unit, Department of Neuroscience and Biomedical Engineering, and MEG Core and Advanced Magnetic Imaging (AMI) Centre, Aalto NeuroImaging, Aalto University School of Science, Aalto, Espoo, Finland; and
| |
Collapse
|
136
|
Elattar EA, Saber NZ, Farrag DA. Predictive factors for progression of adolescent idiopathic scoliosis: a 1-year study. EGYPTIAN RHEUMATOLOGY AND REHABILITATION 2015. [DOI: 10.4103/1110-161x.163943] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
137
|
Haberfehlner H, Maas H, Harlaar J, Newsum IE, Becher JG, Buizer AI, Jaspers RT. Assessment of net knee moment-angle characteristics by instrumented hand-held dynamometry in children with spastic cerebral palsy and typically developing children. J Neuroeng Rehabil 2015; 12:67. [PMID: 26272620 PMCID: PMC4536590 DOI: 10.1186/s12984-015-0056-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 07/13/2015] [Indexed: 08/21/2023] Open
Abstract
Background The limited range of motion during walking in children with spastic cerebral palsy (SCP) may be the result of altered mechanical characteristics of muscles and connective tissues around the knee joint. Measurement of static net knee moment-angle relation will provide insights into these alterations, for which instrumented hand-held dynamometry may be applied. The aims of this study were: (1) to test the measurement error of the estimated net knee moment-angle characteristics, (2) to determine the correlation between knee extension angle measurement at a standardized knee moment and popliteal angle from common physical examination and (3) to compare net knee moment–angle characteristics in SCP versus typically developing children. Methods With the child lying in sideward position, the knee was extended by moving the lower leg by a hand-held force transducer on a low friction cart. Force data were collected for a range of knee angles. Data were excluded when activity (EMG) levels of knee extensor and flexor muscles exceeded the EMG level during rest by more than two standard deviations. The net knee flexion moments were calculated from recorded force data and measured moment arm. Reliability for knee angles corresponding with 0.5, 1, 2, 3, and 4 Nm knee net flexion moments was assessed by standard error of measurements (SEM) and smallest detectable difference (SDD). Results For between day comparison, SEMs were about 5° and SDDs were below 14° for knee angles at 1-4 Nm net knee flexion moments. In SCP children, the knee angle measured at 4 Nm knee flexion moment was not related to the popliteal angle (r = 0.52). The slope at 4 Nm of the knee moment-angle curve in SCP children was significantly higher than that in typically developing children. Conclusions The presented knee hand-held dynamometry allows assessment of net knee flexion moment-knee angle characteristics in typically developing and SCP children and can be used to identify clinically relevant changes as a result of treatment. Overall stiffness of structures that contribute to the net knee flexion moment at the knee (i.e. muscles, tendons, ligaments) is elevated in SCP children. Electronic supplementary material The online version of this article (doi:10.1186/s12984-015-0056-y) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Helga Haberfehlner
- Faculty of Human Movement Sciences, VU University Amsterdam, Van der Boechorststraat 9, 1081, BT, Amsterdam, The Netherlands. .,Department of Rehabilitation Medicine, VU University Medical Center, De Boelelaan 1118, 1081, HZ, Amsterdam, The Netherlands. .,MOVE Research Institute Amsterdam, VU University Amsterdam, Amsterdam, The Netherlands, Van der Boechorststraat 9, 1081, BT, Amsterdam, The Netherlands.
| | - Huub Maas
- Faculty of Human Movement Sciences, VU University Amsterdam, Van der Boechorststraat 9, 1081, BT, Amsterdam, The Netherlands. .,MOVE Research Institute Amsterdam, VU University Amsterdam, Amsterdam, The Netherlands, Van der Boechorststraat 9, 1081, BT, Amsterdam, The Netherlands.
| | - Jaap Harlaar
- Department of Rehabilitation Medicine, VU University Medical Center, De Boelelaan 1118, 1081, HZ, Amsterdam, The Netherlands. .,MOVE Research Institute Amsterdam, VU University Amsterdam, Amsterdam, The Netherlands, Van der Boechorststraat 9, 1081, BT, Amsterdam, The Netherlands.
| | - Irene E Newsum
- Department of Rehabilitation Medicine, VU University Medical Center, De Boelelaan 1118, 1081, HZ, Amsterdam, The Netherlands.
| | - Jules G Becher
- Department of Rehabilitation Medicine, VU University Medical Center, De Boelelaan 1118, 1081, HZ, Amsterdam, The Netherlands. .,MOVE Research Institute Amsterdam, VU University Amsterdam, Amsterdam, The Netherlands, Van der Boechorststraat 9, 1081, BT, Amsterdam, The Netherlands.
| | - Annemieke I Buizer
- Department of Rehabilitation Medicine, VU University Medical Center, De Boelelaan 1118, 1081, HZ, Amsterdam, The Netherlands.
| | - Richard T Jaspers
- Faculty of Human Movement Sciences, VU University Amsterdam, Van der Boechorststraat 9, 1081, BT, Amsterdam, The Netherlands. .,MOVE Research Institute Amsterdam, VU University Amsterdam, Amsterdam, The Netherlands, Van der Boechorststraat 9, 1081, BT, Amsterdam, The Netherlands.
| |
Collapse
|
138
|
Li J, Zhou Y, Zheng YP, Li G. An attempt to bridge muscle architecture dynamics and its instantaneous rate of force development using ultrasonography. ULTRASONICS 2015; 61:71-78. [PMID: 25911147 DOI: 10.1016/j.ultras.2015.03.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 03/23/2015] [Accepted: 03/28/2015] [Indexed: 06/04/2023]
Abstract
Muscle force output is an essential index in rehabilitation assessment or physical exams, and could provide considerable insights for various applications such as load monitoring and muscle assessment in sports science or rehabilitation therapy. Besides direct measurement of force output using a dynamometer, electromyography has earlier been used in several studies to quantify muscle force as an indirect means. However, its spatial resolution is easily compromised as a summation of the action potentials from neighboring motor units of electrode site. To explore an alternative method to indirectly estimate the muscle force output, and with better muscle specificity, we started with an investigation on the relationship between architecture dynamics and force output of triceps surae. The muscular architecture dynamics is captured in ultrasonography sequences and estimated using a previously reported motion estimation method. Then an indicator named as the dorsoventrally averaged motion profile (DAMP) is employed. The performance of force output is represented by an instantaneous version of the rate of force development (RFD), namely I-RFD. From experimental results on ten normal subjects, there were significant correlations between the I-RFD and DAMP for triceps surae, both normalized between 0 and 1, with the sum of squares error at 0.0516±0.0224, R-square at 0.7929±0.0931 and root mean squared error at 0.0159±0.0033. The statistical significance results were less than 0.01. The present study suggested that muscle architecture dynamics extracted from ultrasonography during contraction is well correlated to the I-RFD and it can be a promising option for indirect estimation of muscle force output.
Collapse
Affiliation(s)
- Jizhou Li
- School of Medicine, Shenzhen University, China; Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong
| | - Yongjin Zhou
- School of Medicine, Shenzhen University, China; National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, China; Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, China.
| | - Yong-Ping Zheng
- Interdisciplinary Division of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong
| | - Guanglin Li
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, China
| |
Collapse
|
139
|
Lee J, Kagamihara Y, Kakei S. A New Method for Functional Evaluation of Motor Commands in Patients with Cerebellar Ataxia. PLoS One 2015; 10:e0132983. [PMID: 26186225 PMCID: PMC4505901 DOI: 10.1371/journal.pone.0132983] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 06/23/2015] [Indexed: 11/19/2022] Open
Abstract
Quantitative evaluation of motor functions of patients with cerebellar ataxia is vital for evidence-based treatments and has been a focus in previous investigations of movement kinematics. Due to redundancy of the musculoskeletal system, muscle activities contain more information than the movement kinematics. Therefore, it is preferable to analyze causal anomalies of muscle activities to evaluate motor functions in patients. Here we propose a new method to evaluate the motor functions at the level of muscle activities and movement kinematics. Nineteen patients and 10 control subjects performed two movement tasks of the wrist joint, a step-tracking task and a pursuit task, with a manipulandum. The movements of the wrist joint and activities of the four wrist prime movers were recorded. We developed a linear model for the wrist joint to approximate the causal relationship between muscle activities and movement kinematics in terms of the wrist joint torque. We used a canonical correlation analysis to verify the causality between the muscle activities and the movement kinematics in the model. We found that the activities of the four muscles were related almost entirely to the position and velocity, with negligible correlation with the acceleration of the wrist joint. Moreover, the ratio of the weights for position- and velocity-related torque components characterized the contents of the muscle activities in terms of the movement kinematics. Next, we compared the ratios for the two movement tasks between the controls and patients. In control subjects, the ratios indicated clear task-specific changes that conformed to the functional requirements of the tasks. In contrast, in patients, the task-specific changes diminished highly significantly. The present results indicate that this ability to accommodate motor commands to the task requirements provides a novel quantitative parameter to characterize motor functions in patients with cerebellar ataxia.
Collapse
Affiliation(s)
- Jongho Lee
- Movement Disorders Project, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
| | - Yasuhiro Kagamihara
- Department of Neurology, Tokyo Metropolitan Neurological Hospital, Fuchu, Tokyo 183-0042, Japan
| | - Shinji Kakei
- Movement Disorders Project, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
| |
Collapse
|
140
|
Zhang Q, Hosoda R, Venture G. Human joint motion estimation for electromyography (EMG)-based dynamic motion control. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2015; 2013:21-4. [PMID: 24109614 DOI: 10.1109/embc.2013.6609427] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This study aims to investigate a joint motion estimation method from Electromyography (EMG) signals during dynamic movement. In most EMG-based humanoid or prosthetics control systems, EMG features were directly or indirectly used to trigger intended motions. However, both physiological and nonphysiological factors can influence EMG characteristics during dynamic movements, resulting in subject-specific, non-stationary and crosstalk problems. Particularly, when motion velocity and/or joint torque are not constrained, joint motion estimation from EMG signals are more challenging. In this paper, we propose a joint motion estimation method based on muscle activation recorded from a pair of agonist and antagonist muscles of the joint. A linear state-space model with multi input single output is proposed to map the muscle activity to joint motion. An adaptive estimation method is proposed to train the model. The estimation performance is evaluated in performing a single elbow flexion-extension movement in two subjects. All the results in two subjects at two load levels indicate the feasibility and suitability of the proposed method in joint motion estimation. The estimation root-mean-square error is within 8.3% ∼ 10.6%, which is lower than that being reported in several previous studies. Moreover, this method is able to overcome subject-specific problem and compensate non-stationary EMG properties.
Collapse
|
141
|
Naik GR, Selvan SE, Nguyen HT. Single-Channel EMG Classification With Ensemble-Empirical-Mode-Decomposition-Based ICA for Diagnosing Neuromuscular Disorders. IEEE Trans Neural Syst Rehabil Eng 2015; 24:734-43. [PMID: 26173218 DOI: 10.1109/tnsre.2015.2454503] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
An accurate and computationally efficient quantitative analysis of electromyography (EMG) signals plays an inevitable role in the diagnosis of neuromuscular disorders, prosthesis, and several related applications. Since it is often the case that the measured signals are the mixtures of electric potentials that emanate from surrounding muscles (sources), many EMG signal processing approaches rely on linear source separation techniques such as the independent component analysis (ICA). Nevertheless, naive implementations of ICA algorithms do not comply with the task of extracting the underlying sources from a single-channel EMG measurement. In this respect, the present work focuses on a classification method for neuromuscular disorders that deals with the data recorded using a single-channel EMG sensor. The ensemble empirical mode decomposition algorithm decomposes the single-channel EMG signal into a set of noise-canceled intrinsic mode functions, which in turn are separated by the FastICA algorithm. A reduced set of five time domain features extracted from the separated components are classified using the linear discriminant analysis, and the classification results are fine-tuned with a majority voting scheme. The performance of the proposed method has been validated with a clinical EMG database, which reports a higher classification accuracy (98%). The outcome of this study encourages possible extension of this approach to real settings to assist the clinicians in making correct diagnosis of neuromuscular disorders.
Collapse
|
142
|
Kalani H, Moghimi S, Akbarzadeh A. SEMG-based prediction of masticatory kinematics in rhythmic clenching movements. Biomed Signal Process Control 2015. [DOI: 10.1016/j.bspc.2015.04.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
143
|
Luger T, Bosch T, Hoozemans M, de Looze M, Veeger D. Task variation during simulated, repetitive, low-intensity work--influence on manifestation of shoulder muscle fatigue, perceived discomfort and upper-body postures. ERGONOMICS 2015; 58:1851-1867. [PMID: 26046391 DOI: 10.1080/00140139.2015.1043356] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
UNLABELLED Work-related musculoskeletal disorders are increasing due to industrialisation of work processes. Task variation has been suggested as potential intervention. The objectives of this study were to investigate, first, the influence of task variation on electromyographic (EMG) manifestations of shoulder muscle fatigue and discomfort; second, noticeable postural shoulder changes over time; third, if the association between task variation and EMG might be biased by postural changes. Outcome parameters were recorded using multichannel EMG, Optotrak and the Borg scale. Fourteen participants performed a one-hour repetitive Pegboard task in one continuous and two interrupted conditions with rest and a pick-and-place task, respectively. Manifestations of shoulder muscle fatigue and discomfort feelings were observed throughout the conditions but these were not significantly influenced by task variation. After correction for joint angles, the relation between task variation and EMG was significantly biased but significant effects of task variation remained absent. PRACTITIONER SUMMARY Comparing a one-hour continuous, repetitive Pegboard task with two interrupted conditions revealed no significant influences of task variation. We did observe that the relation between task variation and EMG was biased by posture and therefore advise taking account for posture when investigating manifestations of muscle fatigue in assembly tasks.
Collapse
Affiliation(s)
- Tessy Luger
- a MOVE Research Institute , Faculty of Human Movement Sciences, VU University Amsterdam , Amsterdam , The Netherlands
- b TNO , Leiden , The Netherlands
- c Body@Work, Research Centre of Physical Activity, Work and Health , TNO-VU/VUmc , Amsterdam , The Netherlands
| | - Tim Bosch
- b TNO , Leiden , The Netherlands
- c Body@Work, Research Centre of Physical Activity, Work and Health , TNO-VU/VUmc , Amsterdam , The Netherlands
| | - Marco Hoozemans
- a MOVE Research Institute , Faculty of Human Movement Sciences, VU University Amsterdam , Amsterdam , The Netherlands
| | - Michiel de Looze
- a MOVE Research Institute , Faculty of Human Movement Sciences, VU University Amsterdam , Amsterdam , The Netherlands
- b TNO , Leiden , The Netherlands
- c Body@Work, Research Centre of Physical Activity, Work and Health , TNO-VU/VUmc , Amsterdam , The Netherlands
| | - Dirkjan Veeger
- a MOVE Research Institute , Faculty of Human Movement Sciences, VU University Amsterdam , Amsterdam , The Netherlands
- d Laboratory for Biomechatronics and Biorobotics, Faculty of Mechanical, Maritime and Materials Engineering , Delft University of Technology , Delft , The Netherlands
| |
Collapse
|
144
|
Therapeutic effects of functional electrical stimulation on gait, motor recovery, and motor cortex in stroke survivors. Hong Kong Physiother J 2015. [DOI: 10.1016/j.hkpj.2014.10.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
145
|
Brachialis muscle activity can be assessed with surface electromyography. J Electromyogr Kinesiol 2015; 25:199-204. [DOI: 10.1016/j.jelekin.2014.11.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Revised: 10/09/2014] [Accepted: 11/11/2014] [Indexed: 11/19/2022] Open
|
146
|
Liu P, Liu L, Clancy EA. Influence of Joint Angle on EMG-Torque Model During Constant-Posture, Torque-Varying Contractions. IEEE Trans Neural Syst Rehabil Eng 2015; 23:1039-46. [PMID: 25706722 DOI: 10.1109/tnsre.2015.2405765] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Relating the electromyogram (EMG) to joint torque is useful in various application areas, including prosthesis control, ergonomics and clinical biomechanics. Limited study has related EMG to torque across varied joint angles, particularly when subjects performed force-varying contractions or when optimized modeling methods were utilized. We related the biceps-triceps surface EMG of 22 subjects to elbow torque at six joint angles (spanning 60° to 135°) during constant-posture, torque-varying contractions. Three nonlinear EMG σ -torque models, advanced EMG amplitude (EMG σ ) estimation processors (i.e., whitened, multiple-channel) and the duration of data used to train models were investigated. When EMG-torque models were formed separately for each of the six distinct joint angles, a minimum "gold standard" error of 4.01±1.2% MVC(F90) resulted (i.e., error relative to maximum voluntary contraction at 90° flexion). This model structure, however, did not directly facilitate interpolation across angles. The best model which did so achieved a statistically equivalent error of 4.06±1.2% MVC(F90). Results demonstrated that advanced EMG σ processors lead to improved joint torque estimation as do longer model training durations.
Collapse
|
147
|
Trulsson A, Miller M, Hansson GÅ, Gummesson C, Garwicz M. Altered movement patterns and muscular activity during single and double leg squats in individuals with anterior cruciate ligament injury. BMC Musculoskelet Disord 2015; 16:28. [PMID: 25887306 PMCID: PMC4333170 DOI: 10.1186/s12891-015-0472-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 01/16/2015] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Individuals with Anterior Cruciate Ligament (ACL) injury often show altered movement patterns, suggested to be partly due to impaired sensorimotor control. Here, we therefore aimed to assess muscular activity during movements often used in ACL-rehabilitation and to characterize associations between deviations in muscular activity and specific altered movement patterns, using and further exploring the previously developed Test for substitution Patterns (TSP). METHODS Sixteen participants (10 women) with unilateral ACL rupture performed Single and Double Leg Squats (SLS; DLS). Altered movement patterns were scored according to TSP, and Surface Electromyography (SEMG) was recorded bilaterally in six hip, thigh and shank muscles. To quantify deviations in muscular activity, SEMG ratios were calculated between homonymous muscles on injured and non-injured sides, and between antagonistic muscles on the same side. Correlations between deviations of injured/non-injured side SEMG ratios and specific altered movement patterns were calculated. RESULTS Injured/non-injured ratios were low at transition from knee flexion to extension in quadriceps in SLS, and in quadriceps and hamstrings in DLS. On injured side, the quadriceps/hamstrings ratio prior to the beginning of DLS and end of DLS and SLS, and tibialis/gastrocnemius ratio at end of DLS were lower than on non-injured side. Correlations were found between specific altered movement patterns and deviating muscular activity at transition from knee flexion to extension in SLS, indicating that the more deviating the muscular activity on injured side, the more pronounced the altered movement pattern. "Knee medial to supporting foot" correlated to lower injured/non-injured ratios in gluteus medius (rs = -0.73, p = 0.001), "lateral displacement of hip-pelvis-region" to lower injured/non-injured ratios in quadriceps (rs = -0.54, p = 0.03) and "displacement of trunk" to higher injured/non-injured ratios in gluteus medius (rs = 0.62, p = 0.01). CONCLUSIONS Deviations in muscular activity between injured and non-injured sides and between antagonistic muscular activity within injured as compared to non-injured sides indicated specific alterations in sensorimotor control of the lower limb in individuals with ACL rupture. Also, correlations between deviating muscular activity and specific altered movement patterns were suggested as indications of altered sensorimotor control. We therefore advocate that quantitative assessments of altered movement patterns should be considered in ACL-rehabilitation.
Collapse
Affiliation(s)
- Anna Trulsson
- Department of Health Sciences, Physiotherapy, Lund University, Lund, Sweden. .,Department of Rehabilitation Medicine, Skane University Hospital, Lund, Sweden.
| | - Michael Miller
- Department of Health Sciences, Physiotherapy, Lund University, Lund, Sweden.
| | - Gert-Åke Hansson
- Occupational and Environmental Medicine, Lund University, and University and Regional Laboratories Region Scania, Lund, Sweden.
| | | | - Martin Garwicz
- Department of Experimental Medical Science, Neuronano Research Center, Lund University, Lund, Sweden.
| |
Collapse
|
148
|
Zander T, Dreischarf M, Schmidt H, Bergmann G, Rohlmann A. Spinal loads as influenced by external loads: A combined in vivo and in silico investigation. J Biomech 2015; 48:578-584. [DOI: 10.1016/j.jbiomech.2015.01.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 12/04/2014] [Accepted: 01/11/2015] [Indexed: 01/15/2023]
|
149
|
On the nature of the electromyographic signals recorded during vibration exercise. Eur J Appl Physiol 2015; 115:1095-106. [DOI: 10.1007/s00421-014-3091-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Accepted: 12/19/2014] [Indexed: 11/27/2022]
|
150
|
Garcia DGB, Benevides SD, Araujo RP, Ribeiro CDO, Mello SMF. Mastigação habitual e atividade eletromiográfica dos músculos masseter e temporal em escolares de 7 a 12 anos. REVISTA CEFAC 2014. [DOI: 10.1590/1982-0216201412413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|