D Farina

Summary

Affiliation: Politecnico di Torino
Country: Italy

Publications

  1. ncbi request reprint Assessment of low back muscle fatigue by surface EMG signal analysis: methodological aspects
    Dario Farina
    Centro di Bioingegneria, Dip di Elettronica, Politecnico di Torino, Torino, Italy
    J Electromyogr Kinesiol 13:319-32. 2003
  2. ncbi request reprint Blind separation of linear instantaneous mixtures of nonstationary surface myoelectric signals
    Dario Farina
    Centro di Bioingegneria, Dipartimento di Elettronica, Politecnico di Torino, Torino 10129, Italy
    IEEE Trans Biomed Eng 51:1555-67. 2004
  3. ncbi request reprint Simulation of surface EMG signals generated by muscle tissues with inhomogeneity due to fiber pinnation
    Luca Mesin
    L Mesin is with the Centro di Bioingegneia, Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
    IEEE Trans Biomed Eng 51:1521-9. 2004
  4. ncbi request reprint Effect of side dominance on myoelectric manifestations of muscle fatigue in the human upper trapezius muscle
    Dario Farina
    Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy
    Eur J Appl Physiol 90:480-8. 2003
  5. ncbi request reprint A novel approach for estimating muscle fiber conduction velocity by spatial and temporal filtering of surface EMG signals
    Dario Farina
    Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
    IEEE Trans Biomed Eng 50:1340-51. 2003
  6. ncbi request reprint Low-threshold motor unit membrane properties vary with contraction intensity during sustained activation with surface EMG visual feedback
    Dario Farina
    Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
    J Appl Physiol 96:1505-15; discussion. 2004
  7. ncbi request reprint Reproducibility of muscle-fiber conduction velocity estimates using multichannel surface EMG techniques
    Dario Farina
    Bioengineering Center, Department of Electronics, Politechnic of Turin, Corso Duca degli Abruzzi 24, Turin 10129, Italy
    Muscle Nerve 29:282-91. 2004
  8. ncbi request reprint Advances in surface electromyographic signal simulation with analytical and numerical descriptions of the volume conductor
    D Farina
    Dipartimento di Elettronica, Laboratorio di Ingegneria del Sistema Neuromuscolare, Politecnico di Torino, Torino, Italy
    Med Biol Eng Comput 42:467-76. 2004
  9. ncbi request reprint Comparison of spatial filter selectivity in surface myoelectric signal detection: influence of the volume conductor model
    D Farina
    Centro di Bioingegneria, Dip di Elettronica, Politecnico di Torino, Torino, Italy
    Med Biol Eng Comput 42:114-20. 2004
  10. ncbi request reprint Methods for estimating muscle fibre conduction velocity from surface electromyographic signals
    D Farina
    Dipartimento di Elettronica, Laboratorio di Ingegneria del Sistema Neuromuscolare, Politecnico di Torino, Torino, Italy
    Med Biol Eng Comput 42:432-45. 2004

Detail Information

Publications94

  1. ncbi request reprint Assessment of low back muscle fatigue by surface EMG signal analysis: methodological aspects
    Dario Farina
    Centro di Bioingegneria, Dip di Elettronica, Politecnico di Torino, Torino, Italy
    J Electromyogr Kinesiol 13:319-32. 2003
    ..The limitations indicated above are important and should be carefully discussed when presenting surface EMG results as a means for low back muscle assessment in clinical practice...
  2. ncbi request reprint Blind separation of linear instantaneous mixtures of nonstationary surface myoelectric signals
    Dario Farina
    Centro di Bioingegneria, Dipartimento di Elettronica, Politecnico di Torino, Torino 10129, Italy
    IEEE Trans Biomed Eng 51:1555-67. 2004
    ....
  3. ncbi request reprint Simulation of surface EMG signals generated by muscle tissues with inhomogeneity due to fiber pinnation
    Luca Mesin
    L Mesin is with the Centro di Bioingegneia, Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
    IEEE Trans Biomed Eng 51:1521-9. 2004
    ....
  4. ncbi request reprint Effect of side dominance on myoelectric manifestations of muscle fatigue in the human upper trapezius muscle
    Dario Farina
    Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy
    Eur J Appl Physiol 90:480-8. 2003
    ..A possible explanation for the results is that long preferential use of one side with respect to the other leads to changes in muscle fiber membrane and control properties, in agreement with previous results on limb muscles...
  5. ncbi request reprint A novel approach for estimating muscle fiber conduction velocity by spatial and temporal filtering of surface EMG signals
    Dario Farina
    Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
    IEEE Trans Biomed Eng 50:1340-51. 2003
    ..The proposed method led to significantly lower bias than the spectral matching method in the experimental conditions, confirming the simulation results...
  6. ncbi request reprint Low-threshold motor unit membrane properties vary with contraction intensity during sustained activation with surface EMG visual feedback
    Dario Farina
    Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
    J Appl Physiol 96:1505-15; discussion. 2004
    ..it is possible to distinguish between CV changes of the same MU at slightly different firing rates. The technique provides a practical method for the noninvasive assessment of both control and membrane properties of single MUs...
  7. ncbi request reprint Reproducibility of muscle-fiber conduction velocity estimates using multichannel surface EMG techniques
    Dario Farina
    Bioengineering Center, Department of Electronics, Politechnic of Turin, Corso Duca degli Abruzzi 24, Turin 10129, Italy
    Muscle Nerve 29:282-91. 2004
    ..Thus, reproducibility of MFCV estimates may be improved significantly using advanced multichannel estimation methods with respect to classic two-channel techniques...
  8. ncbi request reprint Advances in surface electromyographic signal simulation with analytical and numerical descriptions of the volume conductor
    D Farina
    Dipartimento di Elettronica, Laboratorio di Ingegneria del Sistema Neuromuscolare, Politecnico di Torino, Torino, Italy
    Med Biol Eng Comput 42:467-76. 2004
    ..The study thus proposes an approach for surface EMG signal simulation in space invariant systems, as well as new models of the volume conductor using numerical methods...
  9. ncbi request reprint Comparison of spatial filter selectivity in surface myoelectric signal detection: influence of the volume conductor model
    D Farina
    Centro di Bioingegneria, Dip di Elettronica, Politecnico di Torino, Torino, Italy
    Med Biol Eng Comput 42:114-20. 2004
    ..Similar considerations could be drawn for other selectivity indexes. Thus, modelling should be used carefully to infer conclusions on spatial selectivity and to indicate particular choices of spatial filters...
  10. ncbi request reprint Methods for estimating muscle fibre conduction velocity from surface electromyographic signals
    D Farina
    Dipartimento di Elettronica, Laboratorio di Ingegneria del Sistema Neuromuscolare, Politecnico di Torino, Torino, Italy
    Med Biol Eng Comput 42:432-45. 2004
    ..The many open issues in CV estimation are also presented...
  11. ncbi request reprint A surface EMG generation model with multilayer cylindrical description of the volume conductor
    Dario Farina
    Centro di Bioingegneria, Dip di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, 10129 Italy
    IEEE Trans Biomed Eng 51:415-26. 2004
    ..The resultant model is based on analytical derivations and constitutes a step forward in surface EMG signal modeling, including features not described in any other analytical approach...
  12. ncbi request reprint Estimation of average muscle fiber conduction velocity from two-dimensional surface EMG recordings
    Dario Farina
    Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
    J Neurosci Methods 134:199-208. 2004
    ..The method promises to be a useful tool when average CV is estimated for muscle assessment and diagnostic purposes...
  13. ncbi request reprint The extraction of neural strategies from the surface EMG
    Dario Farina
    Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
    J Appl Physiol 96:1486-95. 2004
    ..Although the global surface EMG is a useful measure of muscle activation and assessment, there are limits to the information that can be extracted from this signal...
  14. ncbi request reprint Assessment of average muscle fiber conduction velocity from surface EMG signals during fatiguing dynamic contractions
    Dario Farina
    Center of Bioengineering, Department of Electronics, Politecnico di Torino, Torino, Italy
    IEEE Trans Biomed Eng 51:1383-93. 2004
    ..Ten subjects were investigated during a 4-min cycling task. The method provided reliable assessment of muscle fatigue for these subjects during dynamic contractions...
  15. ncbi request reprint M-wave properties during progressive motor unit activation by transcutaneous stimulation
    Dario Farina
    Laboratorio di Ingegneria del Sistema Neuromuscolare, Dipartimento di Elettronica, Politecnico di Torino, Torino, 10129 Italy
    J Appl Physiol 97:545-55. 2004
    ....
  16. ncbi request reprint Sensitivity of surface EMG-based conduction velocity estimates to local tissue in-homogeneities--influence of the number of channels and inter-channel distance
    D Farina
    Laboratorio di Ingegneria del Sistema Neuromuscolare LISIN, Dipartimento di Elettronica, Politecnico di Torino, Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
    J Neurosci Methods 142:83-9. 2005
    ..The results were in agreement and explained previous experimental findings. It was concluded that multi-channel methods for CV estimation significantly reduce the sensitivity of CV estimates to tissue in-homogeneities...
  17. ncbi request reprint A new method for the extraction and classification of single motor unit action potentials from surface EMG signals
    Marco Gazzoni
    Laboratorio de Ingegneria del Sistema Neuromuscolare LISiN, Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Turin 10129, Italy
    J Neurosci Methods 136:165-77. 2004
    ..The main limitation of the approach is that complete firing patterns can be obtained only in specific cases due to MU action potential superpositions...
  18. ncbi request reprint Compensation of the effect of sub-cutaneous tissue layers on surface EMG: a simulation study
    D Farina
    Centro di Bioingegneria, Dept of Electronics Politecnico di Torino, ASL1 Regione Piemonte, Italy
    Med Eng Phys 21:487-97. 1999
    ..A simulated evaluation of the new filter and the limitations of the approach are presented...
  19. ncbi request reprint A fast and reliable technique for muscle activity detection from surface EMG signals
    Andrea Merlo
    Centro di Bioingegneria, Department of Electronics, Politecnico di Torino, 10129 Torino, Italy
    IEEE Trans Biomed Eng 50:316-23. 2003
    ..The method is designed for a complete real-time implementation and, thus, may be applied in clinical routine activity...
  20. ncbi request reprint Estimation of motor unit conduction velocity from surface EMG recordings by signal-based selection of the spatial filters
    Luca Mesin
    Laboratorio di Ingegneria del Sistema Neuromuscolare, Dipartimento di Elettronica, Politecnico di Torino, 10129 Torino, Italy
    IEEE Trans Biomed Eng 53:1963-71. 2006
    ..9 +/- 0.9% of the signal energy. The technique may find application in single motor unit studies for decreasing the variability and bias of CV estimates due to the presence and different weights of the nonpropagating components...
  21. ncbi request reprint A model for surface EMG generation in volume conductors with spherical inhomogeneities
    Luca Mesin
    Laboratorio di Ingegneria del Sistema Neuromusculare LISiN, Dipartimento di Elettronica, Politecnico di Torino, 10129 Torino, Italy
    IEEE Trans Biomed Eng 52:1984-93. 2005
    ..The limitations of the approximations introduced are discussed. The model is computationally fast and constitutes an advanced means for the analysis and interpretation of surface EMG signal features...
  22. ncbi request reprint Non-invasive assessment of single motor unit mechanomyographic response and twitch force by spike-triggered averaging
    C Cescon
    Dipartimento di Elettronica, Laboratorio di Ingegneria del Sistema Neuromuscolare, Politecnico di Torino, Torino, Italy
    Med Biol Eng Comput 42:496-501. 2004
    ..8+/-3.8 mm s(-2), when the subject maintained a constant force level of 2% MVC. The method proposed allows the non-invasive assessment of single MU membrane and contractile properties during voluntary contractions...
  23. ncbi request reprint A novel approach for precise simulation of the EMG signal detected by surface electrodes
    D Farina
    Centro di Bioingegneria, Department of Electronics, Politecnico di Torino, Italy
    IEEE Trans Biomed Eng 48:637-46. 2001
    ..The approach, based on the separation of the temporal and spatial properties of the muscle fiber action potential and of the volume conductor, includes the capacitive tissue properties...
  24. ncbi request reprint Concentric-ring electrode systems for noninvasive detection of single motor unit activity
    D Farina
    Department of Electronics, Politecnico di Torino, Italy
    IEEE Trans Biomed Eng 48:1326-34. 2001
    ..The results shown are very promising for the noninvasive detection of single motor unit (MU) activities and decomposition of the surface EMG signal into the constituent MU action potential trains...
  25. ncbi request reprint Conduction velocity of quiescent muscle fibers decreases during sustained contraction
    Marco Gazzoni
    Laboratorio di Ingegneria del Sistema Neuromusculore, Dipartimento di Elettronica, Politecnico di Torino, Torino, Italy
    J Neurophysiol 94:387-94. 2005
    ..6 +/- 5.4%). In conclusion, the contraction-induced modifications in electrophysiological membrane properties of muscle fibers are partly independent on fiber activation...
  26. ncbi request reprint Assessment of single motor unit conduction velocity during sustained contractions of the tibialis anterior muscle with advanced spike triggered averaging
    Dario Farina
    Department of Electronics, Centro di Bioingegneria, Politecnico di Torino, Italy
    J Neurosci Methods 115:1-12. 2002
    ..1 m/s with less than 2 s data epochs. The method allows reliable assessment of firing rate and conduction properties of single MUs with applications for the investigation of central and peripheral fatigue mechanisms...
  27. ncbi request reprint Estimation of single motor unit conduction velocity from surface electromyogram signals detected with linear electrode arrays
    D Farina
    Department of Electronics, Politecnico di Torino, Italy
    Med Biol Eng Comput 39:225-36. 2001
    ..1 m s(-1) and allow the detection of statistically significant differences between the CVs of the three MUs. CV can therefore be used for MU classification...
  28. ncbi request reprint Muscle-fiber conduction velocity estimated from surface EMG signals during explosive dynamic contractions
    M Pozzo
    Laboratorio di Ingegneria del Sistema Neuromuscolare, Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
    Muscle Nerve 29:823-33. 2004
    ..It was concluded that CV can be estimated reliably during dynamic tasks involving fast limb movements and that, in these contractions, it may provide important information on motor-unit control properties...
  29. ncbi request reprint Surface electromyography for noninvasive characterization of muscle
    R Merletti
    Centro di Bioingegneria, Politecnico di Torino e ASL1 Regione Piemonte, Torino, Italy
    Exerc Sport Sci Rev 29:20-5. 2001
    ..The location of an electrode pair with respect to the innervation zone(s), the deterministic rather than stochastic nature of the signal, and the possibility of noninvasive fiber typing are discussed...
  30. doi request reprint Surface electromyography in the assessment of jaw elevator muscles
    T Castroflorio
    Department of Biomedical Sciences and Human Oncology, Specialization School of Orthodontics, University of Turin, Turin, Italy
    J Oral Rehabil 35:638-45. 2008
    ....
  31. ncbi request reprint Surface EMG crosstalk evaluated from experimental recordings and simulated signals. Reflections on crosstalk interpretation, quantification and reduction
    D Farina
    Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, 10129, Italy
    Methods Inf Med 43:30-5. 2004
    ..The aim of this study was to analyze the sources of crosstalk signals in surface EMG recordings and to discuss methods proposed in the literature for crosstalk quantification and reduction...
  32. ncbi request reprint Non-invasive assessment of motor unit anatomy in jaw-elevator muscles
    T Castroflorio
    Specialization School of Orthodontics, Department of Biomedical Sciences and Human Oncology, University of Turin, Turin, Italy
    J Oral Rehabil 32:708-13. 2005
    ..Fibre length estimates well matched with published data on cadavers. It was concluded that multi-channel surface EMG provides important and reliable information on the anatomy of single motor units in jaw-elevator muscles...
  33. ncbi request reprint An analytical model for surface EMG generation in volume conductors with smooth conductivity variations
    Luca Mesin
    Laboratorio di Ingegneria del Sistema Neuromuscolare LISIN, Dipartimento di Elettronica, Politecnico di Torino, 10129 Torino, Italy
    IEEE Trans Biomed Eng 53:773-9. 2006
    ..Representative simulations are presented. The proposed model constitutes a new approach for surface EMG signal simulation with applications related to the validation of methods for information extraction from this signal...
  34. ncbi request reprint Evaluation of intra-muscular EMG signal decomposition algorithms
    D Farina
    Centro di Bioingegneria, Dip. di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
    J Electromyogr Kinesiol 11:175-87. 2001
    ..The technique seems to be appropriate for evaluating decomposition performance and constitutes a useful tool for EMG signal researchers to identify the algorithm most appropriate for their needs...
  35. ncbi request reprint A finite element model for describing the effect of muscle shortening on surface EMG
    Luca Mesin
    Laboratorio di Ingegneria del Sistema Neuromuscolare LISIN, Dipartimento di Elettronica, Politecnico di Torino, 10129 Torino, Italy
    IEEE Trans Biomed Eng 53:593-600. 2006
    ..The model provides a new tool for interpreting surface EMG signal features with changes in muscle geometry, as it happens during dynamic contractions...
  36. doi request reprint Experimental analysis of accuracy in the identification of motor unit spike trains from high-density surface EMG
    Ales Holobar
    Laboratorio di Ingegneria del Sistema Neuromuscolare, Politecnico di Torino, 10129 Torino, Italy
    IEEE Trans Neural Syst Rehabil Eng 18:221-9. 2010
    ..38 for abductor digiti minimi). These results constitute an important contribution to the validation of the noninvasive approach for the investigation of motor unit behavior in isometric low-force tasks...
  37. ncbi request reprint Estimation of average muscle fiber conduction velocity from simulated surface EMG in pinnate muscles
    Luca Mesin
    Laboratorio di Ingegneria del Sistema Neuromuscolare LISIN, Dipartimento di Elettronica, Politecnico di Torino, Torino, Italy
    J Neurosci Methods 160:327-34. 2007
    ..These results indicate an important limitation in reliability of CV estimates from the interference EMG when the innervation zone and tendon locations are not distributed perpendicular to fiber direction...
  38. ncbi request reprint Effect of experimental muscle pain on motor unit firing rate and conduction velocity
    Dario Farina
    Centro di Bioingegneria, Dipartimento di Elettronica, Politecnico di Torino, 10129 Turin, Italy
    J Neurophysiol 91:1250-9. 2004
    ..This decrease is not associated with a change in MU membrane properties, indirectly assessed by CV. This study demonstrates a central inhibitory motor control mechanism with an efficacy correlated to the nociceptive activity...
  39. doi request reprint Effect of experimental jaw-muscle pain on the spatial distribution of surface EMG activity of the human masseter muscle during tooth clenching
    T Castroflorio
    Studio Associato Icardi Castroflorio Odontoiatri, Torino, Italy
    J Oral Rehabil 39:81-92. 2012
    ..In conclusion, a unilateral painful stimulation was associated with a bilateral inhibition of the masseter muscles during tooth clenching which resulted in a more uniform distribution of EMG activity...
  40. ncbi request reprint Surface EMG of jaw elevator muscles: effect of electrode location and inter-electrode distance
    T Castroflorio
    Specialization School of Orthodontics, Department of Biomedical Sciences and Human Oncology, Universita di Torino, Torino, Italy
    J Oral Rehabil 32:411-7. 2005
    ..Finally, spectral and, in particular, amplitude EMG variables were very sensitive to inter-electrode distance, which thus should be fixed when subjects or muscles are compared in the same or different experimental conditions...
  41. ncbi request reprint Effect of electrode shape on spectral features of surface detected motor unit action potentials
    D Farina
    Centro di Bioingegneria, Dept of Electronics, Politecnico di Torino, Italy
    Acta Physiol Pharmacol Bulg 26:63-6. 2001
    ..It is shown that the physical dimensions of the electrodes may determine spectral dips in the surface EMG power spectrum but only for particular electrode shapes. Simulation results are shown to validate the theoretical considerations...
  42. ncbi request reprint Surface EMG of jaw-elevator muscles and chewing pattern in complete denture wearers
    M G Piancino
    Cattedra di Ortognatodonzia e Gnatologia funzione masticatoria, Universita degli Studi di Torino, Torino, Italy
    J Oral Rehabil 32:863-70. 2005
    ..The EMG activity in the temporalis anterior was larger with the old denture than in the other conditions. The chewing cycle width and lateral excursion decreased at the delivery of the new denture and recovered after 3 months...
  43. ncbi request reprint Estimation of M-wave scale factor during sustained contractions at high stimulation rate
    Luca Mesin
    Laboratorio di Ingegneria del Sistema Neuromuscolare, Politecnico di Torino, 10129 Torino, Italy
    IEEE Trans Biomed Eng 52:869-77. 2005
    ....
  44. ncbi request reprint Single motor unit analysis from spatially filtered surface electromyogram signals. Part I: spatial selectivity
    D Farina
    Centro di Bioingegneria, Dipartimento di Elettronica, Politecnico di Torino, Torino, Italy
    Med Biol Eng Comput 41:330-7. 2003
    ..The normal double differential filter resulted in spatial selectivity indexes that ware not statistically different in the two directions from those of the best filters in each direction...
  45. ncbi request reprint Multichannel surface EMG for the non-invasive assessment of the anal sphincter muscle
    R Merletti
    Department of Electronics, Politecnico di Torino, Italy
    Digestion 69:112-22. 2004
    ..The aim is to describe the information that can be extracted from signals recorded with such a technique...
  46. ncbi request reprint A model for the generation of synthetic intramuscular EMG signals to test decomposition algorithms
    D Farina
    Centro di Bioingegneria, Department of Electronics, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
    IEEE Trans Biomed Eng 48:66-77. 2001
    ..The desired amount of noise may be added to the synthetic signal which may then be processed by the decomposition algorithm under test to evaluate its capability of recovering the signal features...
  47. ncbi request reprint Motor unit recruitment during constant low force and long duration muscle contractions investigated with surface electromyography
    M Gazzoni
    Centro di Bioingegneria, Dept. of Electronics, Politecnico di Torino, Italy
    Acta Physiol Pharmacol Bulg 26:67-71. 2001
    ..The recruitment of new motor units was more pronounced for higher force contraction levels than for the lower ones. This behaviour was confirmed in two out of five cases by changes of the global EMG variables...
  48. ncbi request reprint Two-dimensional spatial distribution of surface mechanomyographical response to single motor unit activity
    Corrado Cescon
    Laboratory for Engineering of the Neuromuscular System, Department of Electronics, Politecnico di Torino, Torino, Italy
    J Neurosci Methods 159:19-25. 2007
    ..The maps of acceleration showed spatial dependency in single motor unit MMG activities. The technique provides a new insight into motor unit contractile properties...
  49. ncbi request reprint Non-invasive characterization of single motor unit electromyographic and mechanomyographic activities in the biceps brachii muscle
    Corrado Cescon
    Laboratorio di Ingegneria del Sistema Neuromuscolare, Dipartimento di Elettronica, Politecnico di Torino, Torino, Italy
    J Electromyogr Kinesiol 16:17-24. 2006
    ..2 +/- 6.8 Hz; 80% MVC: 40.1 +/- 6.1 Hz; P < 0.001). EMG peak-to-peak amplitude and mean frequency of individual MUs were not correlated with the corresponding variables of MMG at any contraction level...
  50. doi request reprint Compression of multidimensional biomedical signals with spatial and temporal codebook-excited linear prediction
    Elias S G Carotti
    Dipartimento di Automatica e Informatica DAUIN, Politecnico di Torino, Turin, Italy
    IEEE Trans Biomed Eng 56:2604-10. 2009
    ..4 +/- 0.1 dB. In conclusion, a method for exploiting both the temporal and spatial redundancy, typical of multidimensional biomedical signals, has been proposed and proved to be superior to previous coding schemes...
  51. ncbi request reprint Compression of surface EMG signals with algebraic code excited linear prediction
    Elias Carotti
    Dipartimento di Automatica e Informatica DAUIN Politecnico di Torino, Torino, Italy
    Med Eng Phys 29:253-8. 2007
    ..Moreover, the method is characterized by moderate complexity (approximately 20 million instructions/s) and an algorithmic delay smaller than 160 samples (approximately 160ms)...
  52. ncbi request reprint Effect of accelerometer location on mechanomyogram variables during voluntary, constant-force contractions in three human muscles
    C Cescon
    Centro di Bioingegneria, Dip di Elettronica, Politecnico di Torino, Torino, Italy
    Med Biol Eng Comput 42:121-7. 2004
    ..It was concluded that the location of the accelerometer can have an influence on both amplitude and spectral MMG features, and this dependence should be considered when MMG signals are used for muscle assessment...
  53. ncbi request reprint Effect of age on muscle functions investigated with surface electromyography
    Roberto Merletti
    Laboratorio di Ingegneria del Sistema Neuromuscolare, Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
    Muscle Nerve 25:65-76. 2002
    ..Thus, changes in fiber type distribution and decrease in MU firing rate with aging may be factors determining the decrease in maximal voluntary contraction torque and in myoelectric manifestations of muscle fatigue...
  54. ncbi request reprint Standardising surface electromyogram recordings for assessment of activity and fatigue in the human upper trapezius muscle
    Dario Farina
    Centro di Bioingegneria, Dept of Electronics, Politecnico di Torino, Corso Duca degli Abruzzi 24, Turin 10129, Italy
    Eur J Appl Physiol 86:469-78. 2002
    ..Data on the myoelectric manifestations of muscle fatigue of the upper trapezius muscle are provided for the optimal electrode location...
  55. ncbi request reprint Motor unit recruitment strategies investigated by surface EMG variables
    Dario Farina
    Centro di Bioingegneria, Department of Electronics, Politecnico di Torino, Torino 10129, Italy
    J Appl Physiol 92:235-47. 2002
    ..Our results do not support the establishment of a general relationship between spectral EMG variables and torque or recruitment strategy...
  56. ncbi request reprint Influence of anatomical, physical, and detection-system parameters on surface EMG
    Dario Farina
    Centro di Bioingegneria, Department of Electronics, Politecnico di Torino, Italy
    Biol Cybern 86:445-56. 2002
    ..Implications of the results on electrode positioning procedures, spatial filter design, and EMG signal interpretation are discussed...
  57. ncbi request reprint Surface EMG crosstalk between knee extensor muscles: experimental and model results
    Dario Farina
    Dipartimento di Elettronica, Centro di Bioingegneria, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
    Muscle Nerve 26:681-95. 2002
    ..This study clarifies many controversial findings of past investigations and creates the basis for crosstalk interpretation, simulation, and reduction...
  58. ncbi request reprint Nonlinear surface EMG analysis to detect changes of motor unit conduction velocity and synchronization
    Dario Farina
    Centro di Bioingegneria, Dipartimento di Elettronica, Politecnico di Torino, Torino 10129, Italy
    J Appl Physiol 93:1753-63. 2002
    ..This study validates RQA as a means for fatigue assessment with potential advantages (such as the higher sensitivity to changes of muscle status) with respect to the classic spectral analysis...
  59. doi request reprint Analysis of motor units with high-density surface electromyography
    Roberto Merletti
    Laboratorio di Ingegneria del Sistema Neuromuscolare, Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi, 24 10129 Torino, Italy
    J Electromyogr Kinesiol 18:879-90. 2008
    ..This review presents the conditions and methodologies which allow the investigation of motor units with surface EMG...
  60. doi request reprint Analysis of intramuscular electromyogram signals
    Roberto Merletti
    Laboratorio di Ingegneria del Sistema Neuromuscolare LISIN, Dipartimento di Elettronica, Politecnico di Torino, 10129 Torino, Italy
    Philos Transact A Math Phys Eng Sci 367:357-68. 2009
    ....
  61. ncbi request reprint Stimulation artifact in surface EMG signal: effect of the stimulation waveform, detection system, and current amplitude using hybrid stimulation technique
    Francesco Mandrile
    Centro di Bioingegneria, Dipartimento di Elettronica, Politecnico di Torino, 10129 Torino, Italy
    IEEE Trans Neural Syst Rehabil Eng 11:407-15. 2003
    ..It was concluded that, using hybrid stimulation techniques, the selection of particular stimulation waveforms, interelectrode distances, or spatial filters has a minor effect on the reduction of the artifact when recording M-waves...
  62. ncbi request reprint Selectivity of spatial filters for surface EMG detection from the tibialis anterior muscle
    Dario Farina
    Centro di Bioingegneria, Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
    IEEE Trans Biomed Eng 50:354-64. 2003
    ..The 2-D filters investigated (including C1) showed very similar performance and were, thus, considered equivalent from the point of view of spatial selectivity...
  63. ncbi request reprint The linear electrode array: a useful tool with many applications
    Roberto Merletti
    Centro di Bioingegneria, Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
    J Electromyogr Kinesiol 13:37-47. 2003
    ..Linear arrays provide valuable information on the neuromuscular system properties and appear to be promising tools for applied studies and clinical research...
  64. doi request reprint Muscular activation during reverse and non-reverse chewing cycles in unilateral posterior crossbite
    Maria Grazia Piancino
    Department of Orthodontics and Gnathology, Dental School, Turin University, V Nizza 230, Turin, Italy
    Eur J Oral Sci 117:122-8. 2009
    ..It was concluded that when chewing on the crossbite side, the masseter activity is reduced on the mastication side (crossbite) and is unaltered (non-reverse cycles) or increased (reverse) on the non-affected side...
  65. ncbi request reprint Velocity recovery function of the compound muscle action potential assessed with doublet and triplet stimulation
    Ernest Nlandu Kamavuako
    Center for Sensory Motor Interaction SMI, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7 D 3, DK 9220 Aalborg, Denmark
    Muscle Nerve 36:190-6. 2007
    ..Changes in CMAP properties due to repeated activation may influence the accuracy of techniques based on CMAP recordings, such as collision methods...
  66. ncbi request reprint Periodic increases in force during sustained contraction reduce fatigue and facilitate spatial redistribution of trapezius muscle activity
    Deborah Falla
    Center for Sensory Motor Interaction SMI, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7, D 3, 9220 Aalborg, Denmark
    Exp Brain Res 182:99-107. 2007
    ..The change in spatial distribution of EMG amplitude over time during a sustained contraction may reflect a mechanism to counteract fatigue during prolonged muscle activity...
  67. ncbi request reprint Muscle temperature has a different effect on force fluctuations in young and older women
    Susan Dewhurst
    Department of Applied Physiology, University of Strathclyde, Glasgow, UK
    Clin Neurophysiol 118:762-9. 2007
    ..To investigate the effect of muscle temperature on force fluctuations during isometric contractions in young and older females...
  68. ncbi request reprint Estimation of muscle fiber conduction velocity with a spectral multidip approach
    Dario Farina
    Center for Sensory Motor Interaction, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7D 3, Aalborg DK 9220, Denmark
    IEEE Trans Biomed Eng 54:1583-9. 2007
    ..03 m/s with 100 dips. The proposed method does not imply limitation in resolution of the estimated conduction velocity and does not require any iterative procedure for the estimate since it is based on a closed analytical formulation...
  69. ncbi request reprint Spike-triggered average torque and muscle fiber conduction velocity of low-threshold motor units following submaximal endurance contractions
    Dario Farina
    Center for Sensory Motor Interaction, Dept of Health Science and Technology, Aalborg Univ, Fredrik Bajers Vej 7 D 3, DK 9220 Aalborg, Denmark
    J Appl Physiol 98:1495-502. 2005
    ..In conclusion, modifications in peak twitch torque of low-threshold motor units with sustained contraction are mainly determined by mechanisms not related to changes in action potential shape and in its propagation velocity...
  70. ncbi request reprint Effect of muscle-fiber velocity recovery function on motor unit action potential properties in voluntary contractions
    Dario Farina
    Center for Sensory Motor Interaction, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7 D 3, DK 9220 Aalborg, Denmark
    Muscle Nerve 37:650-8. 2008
    ..This has implications for the use of conduction velocity values measured during voluntary contractions to differentiate patient populations from healthy individuals and for the development of normative data...
  71. doi request reprint Optimized wavelets for blind separation of nonstationary surface myoelectric signals
    Dario Farina
    Center for Sensory Motor Interaction SMI, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
    IEEE Trans Biomed Eng 55:78-86. 2008
    ..0% with Choi-Williams distribution, and 35.1 +/- 15.5% with second-order statistics. In conclusion, the proposed approach resulted in better performance than previous methods for the separation of nonstationary myoelectric signals...
  72. doi request reprint Discharge variability of motor units in an intrinsic muscle of transplanted hand
    Dario Farina
    Department of Health Science and Technology, Center for Sensory Motor Interaction, Aalborg University, Fredrik Bajers Vej 7 D 3, Aalborg, Denmark
    J Neurophysiol 99:2232-40. 2008
    ..In conclusion, motor neurons that reinnervated a muscle in a transplanted hand discharged action potentials with a high degree of variability that suggested greater synaptic noise during the voluntary contractions...
  73. pmc Amplitude cancellation of motor-unit action potentials in the surface electromyogram can be estimated with spike-triggered averaging
    Dario Farina
    Center for Sensory Motor Interaction, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
    J Neurophysiol 100:431-40. 2008
    ..05, for abductor digiti minimi). The results indicate that cancellation of APs in the interference EMG can be analytically predicted and experimentally measured with STA from the discharge times of the motor units into the surface EMG...
  74. ncbi request reprint Effect of innervation-zone distribution on estimates of average muscle-fiber conduction velocity
    Mogens Nielsen
    Center for Sensory Motor Interaction, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7 D3, 9220 Aalborg, Denmark
    Muscle Nerve 37:68-78. 2008
    ..The effect of innervation-zone distribution on MFCV estimates is thus substantial and may be a significant confounding factor in experimental and clinical studies on muscles with diffuse innervation zones...
  75. ncbi request reprint The pain-induced decrease in low-threshold motor unit discharge rate is not associated with the amount of increase in spike-triggered average torque
    Dario Farina
    Center for Sensory Motor Interaction, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7 D 3, DK 9220 Aalborg, Denmark
    Clin Neurophysiol 119:43-51. 2008
    ..This study examined whether there is an association between the magnitude of change in motor unit discharge rate and the amount of increase in the spike-triggered average torque during experimental muscle pain...
  76. ncbi request reprint Motor unit conduction velocity during sustained contraction of the vastus medialis muscle
    Nosratollah Hedayatpour
    Center for Sensory Motor Interaction, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7 D 3, 9220 Aalborg, Denmark
    Exp Brain Res 180:509-16. 2007
    ..46; P < 0.0001) but significantly different (P < 0.05). The results indicate that single motor unit conduction velocity and its rate of change during sustained contraction, assessed at a fixed discharge rate, depend on force level...
  77. ncbi request reprint The recruitment order of electrically activated motor neurons investigated with a novel collision technique
    Kristian Hennings
    Center for Sensory Motor Interaction SMI, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7 D 2, DK 9220 Aalborg, Denmark
    Clin Neurophysiol 118:283-91. 2007
    ....
  78. ncbi request reprint Influence of amplitude cancellation on the simulated surface electromyogram
    Kevin G Keenan
    Dept of Integrative Physiology, University of Colorado at Boulder, Boulder, CO 80309 0354, USA
    J Appl Physiol 98:120-31. 2005
    ..These results indicate the amount of amplitude cancellation that can occur in various experimental conditions and its influence on absolute and relative measures of EMG amplitude...
  79. ncbi request reprint Conduction velocity of low-threshold motor units during ischemic contractions performed with surface EMG feedback
    Dario Farina
    Center for Sensory Motor Interaction SMI Dept of Health Science and Technology, Aalborg Univ, Fredrik Bajers Vej 7 D 3, DK 9220 Aalborg, Denmark
    J Appl Physiol 98:1487-94. 2005
    ....
  80. ncbi request reprint Single motor unit and spectral surface EMG analysis during low-force, sustained contractions of the upper trapezius muscle
    Dario Farina
    Center for Sensory Motor Interaction SMI, Department of Health Science and Technology, Aalborg University, Denmark
    Eur J Appl Physiol 96:157-64. 2006
    ..On the contrary, single motor unit conduction velocity may provide an early indication of changes in muscle fiber membrane properties with sustained activity...
  81. ncbi request reprint Effect of power, pedal rate, and force on average muscle fiber conduction velocity during cycling
    Dario Farina
    Center for Sensory Motor Interaction, Aalborg University, Fredrik Bajers Vej 7 D 3, DK 9100 Aalborg, Denmark
    J Appl Physiol 97:2035-41. 2004
    ....
  82. ncbi request reprint Effect of temperature on spike-triggered average torque and electrophysiological properties of low-threshold motor units
    Dario Farina
    Center for Sensory Motor Interaction, Dept of Health Science and Technology, Aalborg Univ, Fredrik Bajers Vej 7 D 3, DK 9220 Aalborg, Denmark
    J Appl Physiol 99:197-203. 2005
    ..43), and with the decrease in action potential amplitude (r2 = 0.50). In conclusion, temperature-induced modifications in fiber membrane conduction properties may have a direct effect on contractile motor unit properties...
  83. ncbi request reprint Cross-comparison of time- and frequency-domain methods for monitoring the myoelectric signal during a cyclic, force-varying, fatiguing hand-grip task
    Edward A Clancy
    Department of Electrical and Computer Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 10609, USA
    J Electromyogr Kinesiol 15:256-65. 2005
    ....
  84. ncbi request reprint Experimental muscle pain decreases voluntary EMG activity but does not affect the muscle potential evoked by transcutaneous electrical stimulation
    Dario Farina
    Department of Health Science and Technology, Center for Sensory Motor Interaction SMI, Aalborg University, Fredrik Bajers Vej 7 D 3, DK 9220 Aalborg, Denmark
    Clin Neurophysiol 116:1558-65. 2005
    ..The aim of this human study was to investigate if voluntary EMG activity and supra-maximal M-wave are affected by injection of hypertonic saline to experimentally induce muscle pain...
  85. ncbi request reprint Muscle fiber conduction velocity of the upper trapezius muscle during dynamic contraction of the upper limb in patients with chronic neck pain
    Deborah Falla
    Division of Physiotherapy, The University of Queensland, Brisbane, QLD 4072, Australia
    Pain 116:138-45. 2005
    ..This may be associated with the histological and morphological changes, which have previously been identified in people with pain over the trapezius muscle...
  86. ncbi request reprint Experimental muscle pain changes motor control strategies in dynamic contractions
    Ulysses F Ervilha
    Laboratory for Experimental Pain Research, Center for Sensory Motor Interaction SMI, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7D 3, 9220, Aalborg, Denmark
    Exp Brain Res 164:215-24. 2005
    ..Such a changed motor strategy may be highly relevant in models of occupational musculoskeletal pain conditions...
  87. ncbi request reprint Upper trapezius muscle mechanomyographic and electromyographic activity in humans during low force fatiguing and non-fatiguing contractions
    Pascal Madeleine
    Centre for Sensory Motor Interaction, Aalborg University, Fredrik Bajers Vej 7, Bldg D 3, 9220 Aalborg, Denmark
    Eur J Appl Physiol 87:327-36. 2002
    ..For fatiguing contractions, normalisation of the EMG and MMG to some extent can lead to a misleading interpretation. Assessment of the upper trapezius muscle by means of MMG may be valuable in ergonomics...
  88. ncbi request reprint Influence of motor unit properties on the size of the simulated evoked surface EMG potential
    Kevin G Keenan
    Department of Integrative Physiology, University of Colorado at Boulder, 80309, USA
    Exp Brain Res 169:37-49. 2006
    ..These results provide reference information that can be used to assist in the interpretation of experimentally observed changes in the size of evoked muscle potentials...
  89. ncbi request reprint Amplitude cancellation reduces the size of motor unit potentials averaged from the surface EMG
    Kevin G Keenan
    Department of Integrative Physiology, University of Colorado at Boulder, CO 80309 0354, USA
    J Appl Physiol 100:1928-37. 2006
    ..These findings document the influence of amplitude cancellation on motor unit potentials averaged from the surface EMG and the consequences for using the procedure to characterize motor unit properties...
  90. ncbi request reprint Spatial and temporal changes of upper trapezius muscle fiber conduction velocity are not predicted by surface EMG spectral analysis during a dynamic upper limb task
    Deborah Falla
    Center for Sensory Motor Interaction SMI, Department of Health Science and Technology, Aalborg University, DK 9220 Aalborg, Denmark
    J Neurosci Methods 156:236-41. 2006
    ..This finding suggests that spectral analysis cannot be used to infer changes in the spatial and temporal behavior of muscle fiber CV during dynamic tasks...
  91. ncbi request reprint Muscle-fiber conduction velocity during concentric and eccentric actions on a flywheel exercise device
    Marco Pozzo
    Department of Physiology and Pharmacology, Section for Muscle and Exercise Physiology, Karolinska Institutet, Berzelius väg 13, SE17177 Stockholm, Sweden
    Muscle Nerve 34:169-77. 2006
    ..This underlines the importance of measuring both CV and spectral variables for muscle assessment in dynamic tasks...
  92. ncbi request reprint The change in spatial distribution of upper trapezius muscle activity is correlated to contraction duration
    Dario Farina
    Center for Sensory Motor Interaction, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7D 3, 9220 Aalborg East, Denmark
    J Electromyogr Kinesiol 18:16-25. 2008
    ..It was concluded that the changes in spatial muscle activity distribution play a role in the ability to maintain a static contraction...
  93. ncbi request reprint Experimental muscle pain results in reorganization of coordination among trapezius muscle subdivisions during repetitive shoulder flexion
    Deborah Falla
    Center for Sensory Motor Interaction SMI, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7D 3, 9220, Aalborg, Denmark
    Exp Brain Res 178:385-93. 2007
    ..The results suggest that local elicitation of nociceptive afferents in the upper division of the trapezius induces reorganization in the coordinated activity of the three subdivisions of the trapezius in repetitive dynamic tasks...
  94. ncbi request reprint A pseudojoint estimation of time delay and scale factor for M-wave analysis
    Wrya Muhammad
    Laboratoire I3S, Sophia Antipolis, France
    IEEE Trans Biomed Eng 50:459-68. 2003
    ..In a few representative cases, it is shown that the time scale estimate reveals myoelectric manifestations of muscle fatigue and is less affected by M-wave truncation than spectral EMG attributes...