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Qi L, Li ZP, Tian ZH, Guan S, Zhou J, Liu Y. Differences in muscle coordination between older men and women during brisk walking. Proc Inst Mech Eng H 2023; 237:190-198. [PMID: 36524674 DOI: 10.1177/09544119221143838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Brisk walking is a highly recommended physical activity for healthy community-dwelling older adults. The objective of this study was to examine through principal component analysis (PCA) how muscle coordination differs between older women and men during brisk walking. Thirty-five healthy older adults (65.2 ± 3.0 years old, 18 females, and 17 males) participated in the study. Eight surface electromyographic electrodes were used to record lower extremity muscle activities, and four inertial measurement unit sensors to monitor hip, knee, and ankle motion. Energy expenditure and heart rate were also measured during brisk walking. The effects of a person's sex on muscle coordination were identified through wavelet and PCA analysis of the sEMG signals. The results of energy expenditure and heart rate confirmed that brisk walking exercise is beneficial for older adults. PCA analysis showed that muscle coordination patterns differ between older women and men: during the stance phase a greater co-contraction of tibialis anterior and soleus in the men, and a greater activation of the quadriceps muscles during the loading-response phase in the women. The wavelet and PCA analyses facilitated a quantitative appraisal of sex-specific differences in the muscle coordination patterns of older men and women during brisk walking.
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Affiliation(s)
- Liping Qi
- School of Biomedical Engineering, Dalian University of Technology, Dalian, Liaoning, China
| | - Zhi-Peng Li
- School of Biomedical Engineering, Dalian University of Technology, Dalian, Liaoning, China
| | - Zhi-Hao Tian
- School of Biomedical Engineering, Dalian University of Technology, Dalian, Liaoning, China
| | - Shuo Guan
- School of Biomedical Engineering, Dalian University of Technology, Dalian, Liaoning, China
| | - Jian Zhou
- Sports Social Science Research Center, Shenyang Sport University, Shenyang, Liaoning, China
| | - Ying Liu
- Sports Social Science Research Center, Shenyang Sport University, Shenyang, Liaoning, China
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Qi L, Guan S, Zhang L, Liu HL, Sun CK, Ferguson-Pell M. The Effect of Fatigue on Wheelchair Users' Upper Limb Muscle Coordination Patterns in Time-Frequency and Principal Component Analysis. IEEE Trans Neural Syst Rehabil Eng 2021; 29:2096-2102. [PMID: 34633931 DOI: 10.1109/tnsre.2021.3119359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
An assessment of shoulder muscle coordination patterns is important to gain insight into muscle fatigue during wheelchair propulsion. The objective of the present study was to quantify muscle coordination changes over time during fatiguing wheelchair propulsion, as the muscles go through distinct levels of fatigue, a) non-fatigued, b) transiting to fatigue and c) fatigued to exhaustion. We recorded surface electromyography (sEMG) signals of the anterior deltoid (AD), middle deltoid (MD), posterior deltoid (PD), infraspinatus (IS), upper trapezius (UT), sternal head of the pectoralis major (PM), biceps brachii (BB), and triceps brachii (TB) during a wheelchair incremental exercise test. Nine wheelchair users with a diagnosis of spina bifida or T6-T12 spinal cord injury volunteered for the study. Oxygen uptake and SmartWheel kinetic parameters were also recorded during the test. EMG signals were processed by wavelet and principal component analysis (PCA), allowing for an assessment of how wheelchair users modify their muscle coordination patterns over time. Analyses of covariance (ANCOVA) were conducted to identify the main effect of fatigue levels on muscle coordination patterns by controlling for the effect of increased workload as covariate. A significant effect of fatigue levels on the PC1 and PC3 loading scores was found after controlling for the effect of increasing workloads (with both cases). In addition, PC3 reflects the most dominant fatigue effect on muscle coordination patterns which are not affected by increased ergometer workload. PC3 indicates muscle imbalance when muscles are fully fatigued and muscle co-contraction when muscles are beginning to fatigue. We conclude that fatigue-related changes in neuromuscular activity during wheelchair propulsion contribute to muscle imbalance and reflect a strategy of stiffening the shoulder joint.
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Combinational spectral band activation complexity: Uncovering hidden neuromuscular firing dynamics in EMG. Biomed Signal Process Control 2021. [DOI: 10.1016/j.bspc.2021.102891] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Fuglsang-Damgaard L, Harrison A, Vitger A. Altered muscle activation in agility dogs performing warm-up exercises: an acoustic myography study. COMPARATIVE EXERCISE PHYSIOLOGY 2021. [DOI: 10.3920/cep190076] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Agility is physically demanding and dogs encounter a considerable risk of injury during training and competition. Pre-performance warm-up is used routinely among human athletes to prepare the tissues for these physical demands, but in canine sports evidence for effects of warm-up is lacking. The aim of this study was to investigate the effects of warm-up in dogs on two major muscles involved in locomotion. It was hypothesised that, after warm-up, the muscles would be used more efficiently (more fibre resting time/total time), recruit fewer fibres (reduced spatial summation) and/or activated with a lower firing frequency (reduced temporal summation). The following factors ‘sex, age, weight, height, training level and agility experience’ were evaluated for their potential impact on muscle function parameters. Fourteen large (≥46 cm at the withers) agility dogs of different breeds and training levels performed a 5 min warm-up program three times, with a 2 min break between the programs for recording purposes. Acoustic myography sensors were attached on the skin over the muscles m. triceps brachii (TB) and m. gluteus superficialis (GS). Recordings of muscle activity were made, while the dogs trotted before warm-up and after each 5 min warm-up program. The dogs used TB more efficiently after 5 min (P<0.05), 10 min (P<0.05) and 15 min (P<0.001) of exercise compared to pre-warm-up values. No changes were found in the activity of GS. For well-trained dogs, TB recruited fewer muscle fibres after 10 and 15 min of warm-up compared to dogs that trained less than 1 h weekly (P<0.03). For dogs with more than 2 years of experience, GS had a lower firing frequency before and after 10 min warm-up compared to dogs with less experience. The results indicate that warm-up alters muscle activation by an increased muscular efficiency. Training level and experience have an influence on muscle function parameters.
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Affiliation(s)
| | - A.P. Harrison
- University of Copenhagen, PAS (Physiology), Faculty of Health and Medical Sciences, Dyrlægevej 100, 1870 Frederiksberg C, Denmark
| | - A.D. Vitger
- DVM, University of Copenhagen, Faculty of Health and Medical Sciences, Veterinary Clinical Sciences, Dyrlægevej 16, 1870 Frederiksberg C, Denmark
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Qi L, Ma XC, Zhou DD, Guan S, Gao FS, Cong PX. Wavelet and principal component analysis of electromyographic activity and slow component of oxygen uptake during heavy and severe cycling exercise. Appl Physiol Nutr Metab 2019; 45:187-192. [PMID: 31287965 DOI: 10.1139/apnm-2019-0037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The aim of the study was to investigate whether the slow component of oxygen uptake was concurrent with the recruitment of large α-motoneuron muscle fibres by using wavelet and principal component analysis (PCA) of electromyography (EMG) during heavy and severe cycling exercise. Eleven male subjects participated in the study. After establishing each subject's maximum value of oxygen uptake through an incremental test on the cycle ergometer, the subjects performed 6-min cycling tests at heavy and severe intensity. EMG signals were collected from rectus femoris, biceps femoris long head, tibialis anterior, and medial gastrocnemius and processed by combined use of wavelet and PCA analysis. The time delays to the onset of slow component occurred significantly earlier during severe (105.22 ± 5.45 s) compared with during heavy (138.78 ± 15.09 s) exercise. ANOVA with repeated measures showed that for all muscles tested, the angle θ formed by the first and second principal components decreased significantly between time windows during heavy and severe exercise. However, significant increases of EMG mean power frequency (MPF) were found only during heavy exercise. Our results show the concurrence of the oxygen uptake slow component with the additional recruitment of muscle fibres, presumably less efficient large α-motoneuron fibres. Novelty The expected rise in MPF may be offset by muscle fatigue occurring in the later time windows of the slow component during severe exercise. The gradual shift to higher EMG frequencies throughout the slow-component phase was reflected in the progressive and significant decrease of angle θ.
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Affiliation(s)
- Liping Qi
- School of Biomedical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
| | - Xiao-Chi Ma
- School of Biomedical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
| | - Dong-Dong Zhou
- School of Biomedical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
| | - Shuo Guan
- School of Biomedical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
| | - Feng-Shan Gao
- Faculty of Physical Education, Dalian University of Technology, Dalian 116024, Liaoning, China
| | - Pei-Xin Cong
- Faculty of Physical Education, Dalian University of Technology, Dalian 116024, Liaoning, China
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Qi L, Ferguson-Pell M, Lu Y. The Effect of Manual Wheelchair Propulsion Speed on Users' Shoulder Muscle Coordination Patterns in Time-Frequency and Principal Component Analysis. IEEE Trans Neural Syst Rehabil Eng 2018; 27:60-65. [PMID: 30571642 DOI: 10.1109/tnsre.2018.2886826] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A rehabilitation program for wheelchair users should be based on a thorough understanding of shoulder muscle coordination patterns. The objective of the study was to quantify the extent to which the muscle electromyographic (EMG) patterns vary with propulsion speed. A total of 11 wheelchair-dependent participants with a diagnosis of spina bifida or T6-T12 spinal cord injury volunteered for the study. Each participant performed a series of wheelchair propulsion bouts at 1m/s, 1.3 m/s, and 1.6m/s. EMG signals of 8 shoulder muscles as well as the physiological and kinetic variables were recorded. Propulsion at 1.6m/s generated significantly higher EMG intensities in biceps brachii, anterior deltoid, pectoralis major, and middle deltoid than at 1m/s and 1.3m/s. The combined wavelet and principal component analysis showed that the faster propulsion speed requires higher push muscle activity in the early push phase and in the phase transitions between alternating push and recovery. Training to strengthen the shoulder flexors to achieve smoother phase transitions could improve rehabilitation outcomes by increasing functional speed while lessening shoulder strain.
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Plewa K, Samadani A, Orlandi S, Chau T. A novel approach to automatically quantify the level of coincident activity between EMG and MMG signals. J Electromyogr Kinesiol 2018; 41:34-40. [PMID: 29738937 DOI: 10.1016/j.jelekin.2018.04.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 02/26/2018] [Accepted: 04/03/2018] [Indexed: 11/25/2022] Open
Abstract
Although previous studies have highlighted both similarities and differences between the timing of electromyography (EMG) and mechanomyography (MMG) activities of muscles, there is no method to systematically quantify the temporal alignment between corresponding EMG and MMG signals. We proposed a novel method to determine the level of coincident activity in quasi-periodic MMG and EMG signals. The method optimizes 3 muscle-specific parameters: amplitude threshold, window size and minimum percent of EMG and MMG overlap using a particle swarm optimization algorithm to maximize the agreement (balanced accuracy) between electrical and mechanical muscle activity. The method was applied to bilaterally recorded EMG and MMG signals from 4 lower limb muscles per side of 25 pediatric participants during self-paced gait. Mean balanced accuracy exceeded 75% for all muscles except the lateral gastrocnemius, where EMG and MMG misalignment was notable (56% balanced accuracy). The proposed method can be applied to the criterion-driven comparison of simultaneously recorded myographic signals from two different measurement modalities during a motor task.
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Affiliation(s)
- Katherine Plewa
- Holland Bloorview Kids Rehabilitation Hospital, Canada; Institute of Biomaterials & Biomedical Engineering, University of Toronto, Canada
| | - Ali Samadani
- Holland Bloorview Kids Rehabilitation Hospital, Canada; Institute of Biomaterials & Biomedical Engineering, University of Toronto, Canada
| | - Silvia Orlandi
- Holland Bloorview Kids Rehabilitation Hospital, Canada; Institute of Biomaterials & Biomedical Engineering, University of Toronto, Canada
| | - Tom Chau
- Holland Bloorview Kids Rehabilitation Hospital, Canada; Institute of Biomaterials & Biomedical Engineering, University of Toronto, Canada.
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Del Vecchio A, Negro F, Felici F, Farina D. Associations between motor unit action potential parameters and surface EMG features. J Appl Physiol (1985) 2017; 123:835-843. [PMID: 28751374 DOI: 10.1152/japplphysiol.00482.2017] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 07/24/2017] [Accepted: 07/25/2017] [Indexed: 11/22/2022] Open
Abstract
The surface interference EMG signal provides some information on the neural drive to muscles. However, the association between neural drive to muscle and muscle activation has long been debated with controversial indications due to the unavailability of motor unit population data. In this study, we clarify the potential and limitations of interference EMG analysis to infer motor unit recruitment strategies with an experimental investigation of several concurrently active motor units and of the associated features of the surface EMG. For this purpose, we recorded high-density surface EMG signals during linearly increasing force contractions of the tibialis anterior muscle, up to 70% of maximal force. The recruitment threshold (RT), conduction velocity (MUCV), median frequency (MDFMU), and amplitude (RMSMU) of action potentials of 587 motor units from 13 individuals were assessed and associated with features of the interference EMG. MUCV was positively associated with RT (R2 = 0.64 ± 0.14), whereas MDFMU and RMSMU showed a weaker relation with RT (R2 = 0.11 ± 0.11 and 0.39 ± 0.24, respectively). Moreover, the changes in average conduction velocity estimated from the interference EMG predicted well the changes in MUCV (R2 = 0.71), with a strong association to ankle dorsiflexion force (R2 = 0.81 ± 0.12). Conversely, both the average EMG MDF and RMS were poorly associated with motor unit recruitment. These results clarify the limitations of EMG spectral and amplitude analysis in inferring the neural strategies of muscle control and indicate that, conversely, the average conduction velocity could provide relevant information on these strategies.NEW & NOTEWORTHY The surface EMG provides information on the neural drive to muscles. However, the associations between EMG features and neural drive have been long debated due to unavailability of motor unit population data. Here, by using novel highly accurate decomposition of the EMG, we related motor unit population behavior to a wide range of voluntary forces. The results fully clarify the potential and limitation of the surface EMG to provide estimates of the neural drive to muscles.
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Affiliation(s)
- Alessandro Del Vecchio
- Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", Rome, Italy.,Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Francesco Negro
- Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy; and
| | - Francesco Felici
- Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", Rome, Italy
| | - Dario Farina
- Department of Bioengineering, Imperial College London, London, United Kingdom
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Deltoid Electromyography is Reliable During Submaximal Isometric Ramp Contractions. J Appl Biomech 2017; 33:237-240. [DOI: 10.1123/jab.2016-0224] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The EMG and load relationship is commonly measured with multiple submaximal isometric contractions. This method is both time consuming and may introduce fatigue. The purpose of this study was to determine if the electromyography (EMG) amplitude from the middle deltoid was reliable during isometric ramp contractions (IRCs) at different angles of elevation and rates of force application. Surface EMG was measured at 3 shoulder elevation angles during IRCs at 4 submaximal levels of maximum voluntary contraction (MVC). Data were reliable in all conditions except during the rate relative to the subjects’ MVC at 90° for 30% and 40% MVC. The main effect for angle on EMG amplitude was found to be significant, p < .01. EMG at 90° was greater than at 60° (p < .017) and at 30° (p < .017). The main effect of force level on EMG amplitude was significant, p < .01 and follow-up contrast demonstrated a significant (p < .001) linear increase of EMG amplitude with force level. We conclude that EMG amplitude from IRCs are reliable across all shoulder elevation angles and up to 40% MVC. IRCs are a feasible method for recording EMG at the deltoid.
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Harrison AP. A more precise, repeatable and diagnostic alternative to surface electromyography - an appraisal of the clinical utility of acoustic myography. Clin Physiol Funct Imaging 2017; 38:312-325. [PMID: 28251802 DOI: 10.1111/cpf.12417] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 01/11/2017] [Indexed: 11/27/2022]
Abstract
Acoustic myography (AMG) enables a detailed and accurate measurement of those muscles involved in a particular movement and is independent of electrical signals between the nerve and muscle, measuring solely muscle contractions, unlike surface electromyography (sEMG). With modern amplifiers and digital sound recording systems, measurements during physical activity both inside and outside a laboratory setting are now possible and accurate. Muscle sound gives a representation of the work of each muscle group during a complex movement, and under certain forms of movement even reveals both concentric and eccentric activity, something that sEMG is incapable of. Recent findings suggest that AMG has a number of advantages over sEMG, being simple to use, accurate and repeatable as well as being intuitive to interpret. The AMG signal comprises three physiological parameters, namely efficiency/coordination (E-score), spatial summation (S-score) and temporal summation (T-score). It is concluded that modern AMG units have the potential to accurately assess patients with neuromuscular and musculoskeletal complaints in hospital clinics, home monitoring situations as well as sports settings.
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Affiliation(s)
- Adrian P Harrison
- Department of Veterinary Clinical & Animal Sciences, Faculty of Health & Medical Sciences, Copenhagen University, Frederiksberg C, Denmark
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11
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Xie HB, Zhou P, Guo T, Sivakumar B, Zhang X, Dokos S. Multiscale Two-Directional Two-Dimensional Principal Component Analysis and Its Application to High-Dimensional Biomedical Signal Classification. IEEE Trans Biomed Eng 2016. [DOI: 10.1109/tbme.2015.2436375] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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Priego Quesada JI, Carpes FP, Bini RR, Salvador Palmer R, Pérez-Soriano P, Cibrián Ortiz de Anda RM. Relationship between skin temperature and muscle activation during incremental cycle exercise. J Therm Biol 2015; 48:28-35. [DOI: 10.1016/j.jtherbio.2014.12.005] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Revised: 12/10/2014] [Accepted: 12/11/2014] [Indexed: 10/24/2022]
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13
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Krueger E, Scheeren EM, Nogueira-Neto GN, Button VLDSN, Nohama P. Advances and perspectives of mechanomyography. ACTA ACUST UNITED AC 2014. [DOI: 10.1590/1517-3151.0541] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Eddy Krueger
- Universidade Tecnológica Federal do Paraná - UTFPR, Brasil
| | | | | | | | - Percy Nohama
- Universidade Tecnológica Federal do Paraná - UTFPR, Brasil; Pontifícia Universidade Católica do Paraná - PUCPR, Brasil; Universidade Estadual de Campinas - UNICAMP, Brasil
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Farina D, Merletti R, Enoka RM. The extraction of neural strategies from the surface EMG: an update. J Appl Physiol (1985) 2014; 117:1215-30. [PMID: 25277737 DOI: 10.1152/japplphysiol.00162.2014] [Citation(s) in RCA: 314] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
A surface EMG signal represents the linear transformation of motor neuron discharge times by the compound action potentials of the innervated muscle fibers and is often used as a source of information about neural activation of muscle. However, retrieving the embedded neural code from a surface EMG signal is extremely challenging. Most studies use indirect approaches in which selected features of the signal are interpreted as indicating certain characteristics of the neural code. These indirect associations are constrained by limitations that have been detailed previously (Farina D, Merletti R, Enoka RM. J Appl Physiol 96: 1486-1495, 2004) and are generally difficult to overcome. In an update on these issues, the current review extends the discussion to EMG-based coherence methods for assessing neural connectivity. We focus first on EMG amplitude cancellation, which intrinsically limits the association between EMG amplitude and the intensity of the neural activation and then discuss the limitations of coherence methods (EEG-EMG, EMG-EMG) as a way to assess the strength of the transmission of synaptic inputs into trains of motor unit action potentials. The debated influence of rectification on EMG spectral analysis and coherence measures is also discussed. Alternatively, there have been a number of attempts to identify the neural information directly by decomposing surface EMG signals into the discharge times of motor unit action potentials. The application of this approach is extremely powerful, but validation remains a central issue.
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Affiliation(s)
- Dario Farina
- Department of Neurorehabilitation Engineering, Bernstein Focus Neurotechnology Göttingen, Bernstein Center for Computational Neuroscience, University Medical Center Göttingen, Georg-August University, Göttingen, Germany;
| | - Roberto Merletti
- Laboratory for Engineering of the Neuromuscular System, Department of Electronics and Telecommunications, Politecnico di Torino, Turin, Italy; and
| | - Roger M Enoka
- Department of Integrative Physiology, University of Colorado Boulder, Colorado
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15
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Miura T, Sakuraba K. Properties of Force Output and Spectral EMG in Young Patients with Nonspecific Low Back Pain during Isometric Trunk Extension. J Phys Ther Sci 2014; 26:323-9. [PMID: 24707077 PMCID: PMC3975996 DOI: 10.1589/jpts.26.323] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Accepted: 09/22/2013] [Indexed: 12/19/2022] Open
Abstract
[Purpose] To clarify the influence of nonspecific low back pain (NSLBP) on force
fluctuation and the myoelectric data of back muscles during isometric trunk extension at
low to high force levels. [Subjects] Fourteen male subjects with NSLBP and 14 healthy male
control subjects participated in this study. [Methods] All participants extended their
trunk isometrically maintaining 10 levels of target force [2, 5, 10, 15, 20, 30, 50, 70,
80 and 90% of maximal voluntary contraction (MVC) in a random order] for about 4 seconds
with visual feedback. A force transducer and tri-axis force sensor were positioned at the
7th thoracic vertebra to measure force output and the direction of force. Myoelectric
activities of the back muscles (longissimus thoracis, L2 level; multifidus, S1 level) were
recorded by surface electromyography. [Results] Force output of NSLBP subjects fluctuated
more than that of healthy subjects at 30% and 50%MVC. Higher median power frequency in the
multifidus was observed in NSLBP subjects at moderate to high force levels. [Conclusion]
These results show that the properties of force output in NSLBP subjects differ from those
in healthy subjects, suggesting that the assessment of force fluctuation of back muscles
at moderate force levels is a useful index for evaluating and discriminating NSLBP.
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Affiliation(s)
- Tatsuhiro Miura
- Department of Sports Medicine, Graduate School of Medicine, Juntendo University, Japan
| | - Keishoku Sakuraba
- Department of Sports Medicine, Graduate School of Health and Sports Science, Juntendo University, Japan
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EMG oscillator model-based energy kernel method for characterizing muscle intrinsic property under isometric contraction. CHINESE SCIENCE BULLETIN-CHINESE 2014. [DOI: 10.1007/s11434-014-0147-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Harrison AP, Danneskiold-Samsøe B, Bartels EM. Portable acoustic myography - a realistic noninvasive method for assessment of muscle activity and coordination in human subjects in most home and sports settings. Physiol Rep 2013; 1:e00029. [PMID: 24303115 PMCID: PMC3831924 DOI: 10.1002/phy2.29] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 06/13/2013] [Accepted: 06/14/2013] [Indexed: 11/24/2022] Open
Abstract
Muscle sound gives a local picture of muscles involved in a particular movement and is independent of electrical signals between nerve and muscle. Sound recording (acoustic myography) is a well-known noninvasive technique that has suffered from not being easily applicable, as well as not being able to register at sufficient sampling speed. With modern amplifiers and digital sound recording this has changed, and such assessment during movement outside a laboratory setting may be possible. Our aim was to develop a setup for muscle-sound assessment, which could be reliably applied in any local setting. A group of healthy subjects were assessed during standing, stair climbing, walking, and running. Piezoelectric microphones were applied to the skin using contact gel. A digital sound recorder enabled sampling speeds of around 96,000 Hz. Surface electromyography was measured in parallel as a comparison. The recorded signals were assessed and described in terms of signal frequency (Hz) and peak-to-peak amplitude (mV) using Chart software. Bioimpedance of the involved muscles was measured. Sound recording was shown to be an easy noninvasive method for assessment of muscle function during movement with the possibility of being applied in most clinical, sports, and home settings. Muscle sound gives a representation of the work of each muscle group during a complex movement, illustrated here by a step test, which revealed both concentric and eccentric activity. The method in the presented new setup has great potential for assessment of function in patients with musculoskeletal complaints in out-of-clinic settings, as well as in sports.
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Affiliation(s)
- Adrian P Harrison
- Department of Veterinary Clinical & Animal Sciences, Faculty of Health & Medical Sciences, Copenhagen University Grønnegårdsvej 7, DK-1870, Frederiksberg C, Denmark
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Qi L, Wakeling J, Grange S, Ferguson-Pell M. Patterns of shoulder muscle coordination vary between wheelchair propulsion techniques. IEEE Trans Neural Syst Rehabil Eng 2013; 22:559-66. [PMID: 23797282 DOI: 10.1109/tnsre.2013.2266136] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
This study investigated changes in the coordination patterns of shoulder muscles and wheelchair kinetics with different propulsion techniques by comparing wheelchair users' self-selected propulsion patterns with a semicircular pattern adopted after instruction. Wheelchair kinetics data were recorded by Smart(Wheel) on an ergometer, while EMG activity of seven muscles was recorded with surface electrodes on 15 able-bodied inexperienced participants. The performance data in two sessions, first using a self-selected and then the learned semicircular pattern, were compared with a paired t-test. Muscle coordination patterns across seven muscles were analyzed by principal component analysis. The semicircular pattern was characterized by significantly lower push frequency, significantly longer push length, push duration and push distance (p < 0.05, all cases) without a significant increase in push force, when compared with the self-selected pattern. In addition, our results show that in the semicircular propulsion technique, synergistic muscles were recruited in distinct phases and displayed a clearer separation between activities in the push phase and recovery phase muscles. An instruction session in semicircular propulsion technique is recommended for the initial use of a wheelchair after an injury.
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Islam MA, Sundaraj K, Ahmad RB, Ahamed NU. Mechanomyogram for muscle function assessment: a review. PLoS One 2013; 8:e58902. [PMID: 23536834 PMCID: PMC3594217 DOI: 10.1371/journal.pone.0058902] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Accepted: 02/08/2013] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Mechanomyography (MMG) has been extensively applied in clinical and experimental practice to examine muscle characteristics including muscle function (MF), prosthesis and/or switch control, signal processing, physiological exercise, and medical rehabilitation. Despite several existing MMG studies of MF, there has not yet been a review of these. This study aimed to determine the current status on the use of MMG in measuring the conditions of MFs. METHODOLOGY/PRINCIPAL FINDINGS Five electronic databases were extensively searched for potentially eligible studies published between 2003 and 2012. Two authors independently assessed selected articles using an MS-Word based form created for this review. Several domains (name of muscle, study type, sensor type, subject's types, muscle contraction, measured parameters, frequency range, hardware and software, signal processing and statistical analysis, results, applications, authors' conclusions and recommendations for future work) were extracted for further analysis. From a total of 2184 citations 119 were selected for full-text evaluation and 36 studies of MFs were identified. The systematic results find sufficient evidence that MMG may be used for assessing muscle fatigue, strength, and balance. This review also provides reason to believe that MMG may be used to examine muscle actions during movements and for monitoring muscle activities under various types of exercise paradigms. CONCLUSIONS/SIGNIFICANCE Overall judging from the increasing number of articles in recent years, this review reports sufficient evidence that MMG is increasingly being used in different aspects of MF. Thus, MMG may be applied as a useful tool to examine diverse conditions of muscle activity. However, the existing studies which examined MMG for MFs were confined to a small sample size of healthy population. Therefore, future work is needed to investigate MMG, in examining MFs between a sufficient number of healthy subjects and neuromuscular patients.
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Affiliation(s)
- Md Anamul Islam
- AI-Rehab Research Group, Universiti Malaysia Perlis (UniMAP), Kompleks Pauh Putra, Arau, Perlis, Malaysia.
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Sugawara H, Shimose R, Tadano C, Ushigome N, Muro M. Change in EMG with skin friction at different frequencies during elbow flexion. Somatosens Mot Res 2013; 30:72-80. [DOI: 10.3109/08990220.2012.760451] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Ahamed NU, Sundaraj K, Ahmad B, Rahman M, Islam A, Ali A. Surface Electromyography Assessment of the Biceps Brachii Muscle between the Endplate Region and Distal Tendon Insertion: Comparison in Terms of Gender, Dominant Arm and Contraction. J Phys Ther Sci 2013. [DOI: 10.1589/jpts.25.3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
| | | | - Badlisha Ahmad
- School of Computer & Communication Engineering, Universiti Malaysia Perlis
| | - Matiur Rahman
- College of Computer Science and Information System, Najran University, Kingdom of Saudi Arabia
| | - Anamul Islam
- School of Computer & Communication Engineering, Universiti Malaysia Perlis
| | - Asraf Ali
- School of Computer & Communication Engineering, Universiti Malaysia Perlis
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Fischer SL, Hampton RH, Albert WJ. A simple approach to guide factor retention decisions when applying principal component analysis to biomechanical data. Comput Methods Biomech Biomed Engin 2012; 17:199-203. [DOI: 10.1080/10255842.2012.673594] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Progressive resistance exercise and Parkinson's disease: a review of potential mechanisms. PARKINSONS DISEASE 2011; 2012:124527. [PMID: 22191068 PMCID: PMC3236435 DOI: 10.1155/2012/124527] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 09/19/2011] [Accepted: 09/20/2011] [Indexed: 01/12/2023]
Abstract
This paper reviews the therapeutically beneficial effects of progressive resistance exercise (PRE) on Parkinson's disease (PD). First, this paper discusses the rationale for PRE in PD. Within the first section, the review discusses the central mechanisms that underlie bradykinesia and muscle weakness, highlights findings related to the central changes that accompany PRE in healthy individuals, and extends these findings to individuals with PD. It then illustrates the hypothesized positive effects of PRE on nigro-striatal-thalamo-cortical activation and connectivity. Second, it reviews recent findings of the use of PRE in individuals with PD. Finally, knowledge gaps of using PRE on individuals with PD are discussed along with suggestions for future research.
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Qi L, Wakeling JM, Ferguson-Pell M. Spectral properties of electromyographic and mechanomyographic signals during dynamic concentric and eccentric contractions of the human biceps brachii muscle. J Electromyogr Kinesiol 2011; 21:1056-63. [PMID: 22000481 DOI: 10.1016/j.jelekin.2011.08.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2010] [Revised: 08/23/2011] [Accepted: 08/24/2011] [Indexed: 11/27/2022] Open
Abstract
The purpose of this study was to describe and examine the variations in recruitment patterns of motor units (MUs) in biceps brachii (BB) through a range of joint motion during dynamic eccentric and concentric contractions. Twelve healthy participants (6 females, 6 males, age=30±8.5 years) performed concentric and eccentric contractions with constant external loading at different levels. Surface electromyography (EMG) and mechanomyography (MMG) were recorded from BB. The EMGs and MMGs were decomposed into their intensities in time-frequency space using a wavelet technique. The EMG and MMG spectra were then compared using principal component analysis. Variations in total intensity, first principal component (PCI), and the angle θ formed by first component (PCI) and second component (PCII) loading scores were explained in terms of MU recruitment patterns and elbow angles. Elbow angle had a significant effect on dynamic concentric and eccentric contractions. The EMG total intensity was greater for concentric than for eccentric contractions in the present study. MMG total intensity, however, was lower during concentric than during eccentric contractions. In addition, there was no significant difference in θ between concentric and eccentric contractions for both EMG and MMG. Selective recruitment of fast MUs from BB muscle during eccentric muscle contractions was not found in the present study.
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Affiliation(s)
- Liping Qi
- ASPIRE Centre for Disability Sciences, Institute of Orthopedics and Musculoskeletal Science, University College London, Brockley Hill, Stanmore, London HA7 4LP, UK
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