Research Topics
| Madeleine M LowerySummaryAffiliation: University College Dublin Country: Ireland Publications
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Detail Information
Publications
Simulation of intramuscular EMG signals detected using implantable myoelectric sensors (IMES)Madeleine M Lowery
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Belfield, Dublin 4, Ireland
IEEE Trans Biomed Eng 53:1926-33. 2006..The estimated detection radius of the IMES electrode, assuming a cylindrical muscle cross section, was 4.8, 6.2, and 7.5 mm for electrode orientations of 0 degree, 22.5 degrees, and 45 degrees with respect to the muscle fiber direction...- Coherence between motor unit discharges in response to shared neural inputsMadeleine M Lowery
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Dublin, Ireland
J Neurosci Methods 163:384-91. 2007..The results suggest that caution should be taken when interpreting differences in coherence observed between motor units with significantly different firing properties or when comparing data with coherence in different frequency ranges... 
Effect of extracellular potassium accumulation on muscle fiber conduction velocity: a simulation studyEmma Fortune
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Dublin 4, Ireland
Ann Biomed Eng 37:2105-17. 2009....- Application of non-linear control theory to a model of deep brain stimulationClare M Davidson
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Dublin 4, Ireland
Conf Proc IEEE Eng Med Biol Soc 2011:6785-8. 2011.... - Towards a genioglossus surface EMG model of obstructive sleep apneaEric C P Chua
University College Dublin, Ireland
Conf Proc IEEE Eng Med Biol Soc 2009:2979-82. 2009..We also discuss the simulation results in the context of the limited experimental data available for surface genioglossus EMG in obstructive sleep apnea... - Effect of subthalamic nucleus interconnectivity at deep brain stimulation onset and offset: a simulation studyGuiyeom Kang
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Belfield, Dublin 4, Ireland
Conf Proc IEEE Eng Med Biol Soc 2011:7107-10. 2011..Weaker interconnectivity and lower numbers of STN neurons directly receiving DBS input were found to result in longer decay and recovery times at the onset and offset of DBS, respectively... - Effect of subcutaneous fat thickness and surface electrode configuration during neuromuscular electrical stimulationEmer P Doheny
School of Physiotherapy and Performance Science, University College Dublin, Dublin, Ireland
Med Eng Phys 32:468-74. 2010..These results suggest that by using larger electrodes above regions of high subcutaneous fat thickness, the efficacy of NMES could be maintained while reducing the current density at the skin and the associated subject discomfort... - Effect of elbow joint angle on force-EMG relationships in human elbow flexor and extensor musclesEmer P Doheny
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Ireland
J Electromyogr Kinesiol 18:760-70. 2008..It is, therefore, recommended that when using surface EMG to estimate muscle excitation, force should be normalised with respect to its maximum value at each angle... - Analysis of the mechanism of action of deep brain stimulation using the concepts of dither injection and the equivalent nonlinearityAnnraoi M de Paor
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Dublin 4, Ireland
IEEE Trans Biomed Eng 56:2717-20. 2009..We propose that this model provides a framework for understanding the mechanism by which an injected high-frequency signal can quench undesired oscillations in closed-loop systems of interacting neurons in the brain... - The effect of elbow joint centre displacement on force generation and neural excitationEmer P Doheny
University College Dublin, Ireland
Med Biol Eng Comput 47:589-98. 2009.... - Electric field distribution in a finite-volume head model of deep brain stimulationPeadar F Grant
University College Dublin, School of Electrical, Electronic and Mechanical Engineering, Dublin 4, Ireland
Med Eng Phys 31:1095-103. 2009.... - Fatigue related changes in electromyographic coherence between synergistic hand musclesShashikala Kattla
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Belfield, Dublin 4, Ireland
Exp Brain Res 202:89-99. 2010.... - Effects of the electrical double layer and dispersive tissue properties in a volume conduction model of deep brain stimulationPeadar F Grant
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Ireland
Conf Proc IEEE Eng Med Biol Soc 2009:6497-500. 2009.... - The effect of subcutaneous fat thickness on the efficacy of transcutaneous electrical stimulationEmer P Doheny
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Dublin 4, Ireland
Conf Proc IEEE Eng Med Biol Soc 2008:5684-7. 2008.... - Effect of dispersive conductivity and permittivity in volume conductor models of deep brain stimulationPeadar F Grant
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Dublin 4, Ireland
IEEE Trans Biomed Eng 57:2386-93. 2010..33% and 11.10%, respectively, for current-controlled and voltage-controlled stimulations, with higher errors observed when higher or lower frequencies were used... - A model of pathological oscillations in the basal ganglia and deep brain stimulation in Parkinson's diseaseGuiyeom Kang
University College Dublin, Belfield, Ireland
Conf Proc IEEE Eng Med Biol Soc 2009:3909-12. 2009..The efficacy of the DBS input in quenching the pathological oscillations is shown to vary systematically with the frequency, pulse width and amplitude of the applied stimulus... - Improved surface EMG electrode for measuring genioglossus muscle activityCiara M O'Connor
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Belfield, Dublin 4, Ireland
Respir Physiol Neurobiol 159:55-67. 2007.... - Simulation of the interaction between muscle fiber conduction velocity and instantaneous firing rateEmma Fortune
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Belfield, Dublin 4, Ireland
Ann Biomed Eng 39:96-109. 2011..They additionally suggest that the positive correlations between instantaneous firing rate, conduction velocity, and amplitude are directly related to the VRF and ARF... - A technique to track individual motor unit action potentials in surface EMG by monitoring their conduction velocities and amplitudesRebecca B J Beck
Department of Electronic and Electrical Engineering, University College Dublin, Dublin 4, Ireland
IEEE Trans Biomed Eng 52:622-9. 2005..It is concluded that this analysis technique enhances the suitability of SEMG for clinical applications and points toward a future of noninvasive diagnosis and assessment of neuromuscular disorders... - A neuromusculoskeletal model of the elbow joint for pre-clinical testing of total elbow replacementEmer P Doheny
School of Electrical, Electronic and Mechanical Engineering, University College Dublin
Conf Proc IEEE Eng Med Biol Soc 2007:2400-3. 2007..In addition, slight changes (up to 4.45 degrees ) in the direction of the joint reaction force vector were also observed... - Effect of membrane properties on skeletal muscle fiber excitability: a sensitivity analysisEmma Fortune
School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Belfield, Dublin 4, Ireland
Med Biol Eng Comput 50:617-29. 2012..Furthermore, they demonstrate the potential of computational modeling as a tool for investigating the underlying mechanisms of complex phenomena such as those which govern skeletal muscle excitation... - Frequency- and time-domain FEM models of EMG: capacitive effects and aspects of dispersionNikolay S Stoykov
Rehabilitation Institute of Chicago, IL 60611, USA
IEEE Trans Biomed Eng 49:763-72. 2002..It is clear that there is a need to establish accurate values of both conductivity and permittivity for human muscle tissue in vivo in order to quantify the influence of capacitance and dispersion on the EMG signal... - A simulation study to examine the use of cross-correlation as an estimate of surface EMG cross talkMadeleine M Lowery
Rehabilitation Institute of Chicago, and Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago 60611, USA
J Appl Physiol 94:1324-34. 2003..Furthermore, it is possible that a high correlation between surface EMG signals may reflect an association between motor unit firing times, for example due to motor unit synchronization... - Independence of myoelectric control signals examined using a surface EMG modelMadeleine M Lowery
Research Department, Rehabilitation Institute of Chicago, Chicago, IL 60611 4496, USA
IEEE Trans Biomed Eng 50:789-93. 2003..More focal control signals can be obtained, at the expense of increased variability, by using the mean square value, rather than the root mean square or average rectified value... - Analysis and simulation of changes in EMG amplitude during high-level fatiguing contractionsMadeleine M Lowery
Rehabilitation Institute of Chicago, 345 E Superior St, Chicago, Illinois 60611, USA
IEEE Trans Biomed Eng 50:1052-62. 2003.... - Finite-element time-domain algorithms for modeling linear Debye and Lorentz dielectric dispersions at low frequenciesNikolay S Stoykov
Rehabilitation Institute of Chicago, IL 60611, USA
IEEE Trans Biomed Eng 50:1100-7. 2003..Potential applications include FETD modeling of electromyography, functional electrical stimulation, defibrillation, and effects of lightning and impulsive electric shock... - Volume conduction in an anatomically based surface EMG modelMadeleine M Lowery
Sensory Motor Performance Program Laboratory, Research Department, Rehabilitation Institute of Chicago, Chicago, IL 60611 4496, USA
IEEE Trans Biomed Eng 51:2138-47. 2004..However, if the objective is to examine more qualitative features of the surface EMG signal, then an idealized volume conductor model with appropriate tissue thicknesses provides a close approximation... - A finite-element analysis of the effect of muscle insulation and shielding on the surface EMG signalNikolay S Stoykov
Rehabilitation Institute of Chicago, 345 East Superior Street, Room 1436, IL 60611, USA
IEEE Trans Biomed Eng 52:117-21. 2005..The results suggest that the crosstalk between insulated or shielded muscles is small but that it increases with increasing subcutaneous fat. The findings may be useful in the control of multifunctional prostheses... - A simulation study to examine the effect of common motoneuron inputs on correlated patterns of motor unit dischargeMadeleine M Lowery
Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Illinois, USA
J Comput Neurosci 19:107-24. 2005.... - A multiple-layer finite-element model of the surface EMG signalMadeleine M Lowery
Rehabilitation Institute of Chicago, Department of Physical Medicine and Rehabilitation, Northwestem University, IL 60611, USA
IEEE Trans Biomed Eng 49:446-54. 2002.... - Decoding a new neural machine interface for control of artificial limbsPing Zhou
Neural Engineering Center for Artificial Limbs, Rehabilitation Institute of Chicago, IL, USA
J Neurophysiol 98:2974-82. 2007..In addition, the results demonstrate that the central motor control system is capable of eliciting complex efferent commands for a missing limb, in the absence of peripheral feedback and without retraining of the pathways involved...