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Single Motor Unit Laboratory: Publications

Effect of Acute Intermittent Hypoxia on Motor Function in Individuals with Chronic Spinal Cord Injury Following Ibuprofen Pretreatment: A Pilot Study
M M Lynch, L D Duffell, M S Sandhu, S Srivatsan, K Deatsch, A Kessler, G S Mitchell, A Jayaraman, W Z Rymer
Journal of Spinal Cord Medicine, Accepted for publication

Extracting extensor digitorum communis activation patterns using high-density surface electromyography
X Hu, N L Suresh, C Xue, W Z Rymer
Frontiers in Physiology 10/2015; 6

Altered spatial muscle activation patterns reveal possible mechanisms of motor impairment in stroke
G Rasool, B Afsharipour, N L Suresh, X Hu, W Z Rymer
Society for Neuroscience. Annual Meeting 10/2015

Assessing altered motor unit recruitment patterns in paretic muscles of stroke survivors using surface electromyography
X Hu, A K Suresh, W Z Rymer, N L Suresh
Journal of Neural Engineering 09/2015; 12(6):066001

Estimation of Musculotendon Kinematics under Controlled Tendon Indentation
M K Chardon, Y Y Dhaher, N L Suresh, G Jaramillo, W Z Rymer
Journal of Biomechanics 08/2015; 48(13)

Spatial Analysis of Muscular Activations in Stroke Survivors
G Rasool, B Afsharipour, N L Suresh, W Z Rymer
37th Annual International IEEE EMBS Conference 08/2015

Changes in motor unit behavior following isometric fatigue of the first dorsal interosseous muscle
L M McManus, X Hu, W Z Rymer, M M Lowery, N L Suresh
Journal of Neurophysiology 03/2015; 113(9):jn.00146.2015

Evidence for altered upper extremity muscle synergies in chronic stroke survivors with mild and moderate impairment
J Roh, W Z Rymer, R F Beer
Frontiers in Human Neuroscience 02/2015; 9:6

Estimating the Time Course of Population Excitatory Postsynaptic Potentials in Motoneurons of Spastic Stroke Survivors.
X Hu, N L Suresh, W Z Rymer
Journal of Neurophysiology 12/2014; 113(6):jn.00946.2014

Contributions of Motoneuron Hyperexcitability to Clinical Spasticity in Hemispheric Stroke Survivors
X Hu, N L Suresh, M K Chardon, W Z Rymer
Clinical Neurophysiology 11/2014; 126(8)

Anomalous EMG–force relations during low-force isometric tasks in hemiparetic stroke survivors
N L Suresh, N S Concepcion, J Madoff, W Z Rymer
Experimental Brain Research 09/2014; 233(1)

Control of motor unit firing during step-like increases in voluntary force
X Hu, W Z Rymer, N L Suresh
Frontiers in Human Neuroscience 09/2014; 8:721

EMG feature assessment for myoelectric pattern recognition and channel selection: A study with incomplete spinal cord injury
J Liu, X Li, G li, P Zhou
Medical Engineering & Physics 07/2014; 36(7)

EMG-force relation in the first dorsal interosseous muscle of patients with amyotrophic lateral sclerosis
F Jahanmiri, X Hu, N L Suresh, W Z Rymer, P Zhou
Neurorehabilitation 07/2014; 35(2)

Changes in Motoneuron Afterhyperpolarization Duration in Stroke Survivors.
A K Suresh, X Hu, R K Powers , C J Heckman, N L Suresh, W Z Rymer
Journal of Neurophysiology 06/2014; 112(6)

Activation deficit correlates with weakness in chronic stroke: Evidence from evoked and voluntary EMG recordings
S Li, J Liu, M Bhadane, P Zhou, W Z Rymer
Clinical neurophysiology: official journal of the International Federation of Clinical Neurophysiology 04/2014; 125(12)

Motor unit firing rate patterns during voluntary muscle force generation: A simulation study
X Hu, W Z Rymer, N L Suresh
Journal of Neural Engineering 03/2014; 11(2):026015

Asymmetries in vestibular evoked myogenic potentials in chronic stroke survivors with spastic hypertonia: Evidence for a vestibulospinal role
D M Miller, C S Klein· N L Suresh, W Z Rymer
Clinical neurophysiology: official journal of the International Federation of Clinical Neurophysiology 03/2014; 125(10)

Quantifying the Deep Tendon Reflex Using Varying Tendon Indentation Depths: Applications to Spasticity
M K Chardon, W Z Rymer, N L Suresh
IEEE Transactions on Neural Systems and Rehabilitation Engineering 03/2014; 22(2):280-289

Disturbances of Motor Unit Rate Modulation are Prevalent in Muscles of Spastic-Paretic Stroke Survivors.
C J Mottram, C J Heckman, R K Powers , W Z Rymer, N L Suresh
Journal of Neurophysiology 02/2014; 111(10)

Accuracy assessment of a surface electromyogram decomposition system in human first dorsal interosseus muscle
X Hu, W Z Rymer, N L Suresh
Journal of Neural Engineering 02/2014; 11(2):026007

Suppression of stimulus artifact contaminating electrically evoked electromyography
J Liu, S Li, X Li, C S Klein, W Z Rymer, P Zhou
Neurorehabilitation 01/2014; 34(2)

Power spectral analysis of surface electromyography (EMG) at matched contraction levels of the first dorsal interosseous muscle in stroke survivors
X Li, H Shin, P Zhou, X Niu, J Liu, W Z Rymer
Clinical neurophysiology: official journal of the International Federation of Clinical Neurophysiology 11/2013; 125(5)

Power spectral analysis of surface EMG in stroke: A preliminary study
S Srivatsan, X Hu, B Jeon, A K Suresh, W Z Rymer, N L Suresh
Neural Engineering (NER), 2013 6th International IEEE/EMBS Conference on; 11/2013

Reliability of spike triggered averaging of the surface electromyogram for motor unit action potential estimation
X Hu, W Z Rymer, N L Suresh
Muscle & Nerve 10/2013; 48(4)

Assessment of validity of a high-yield surface electromyogram decomposition
X Hu, W Z Rymer, N L Suresh
Journal of NeuroEngineering and Rehabilitation 09/2013; 10(1):99

Machine Learning for Supporting Diagnosis of Amyotrophic Lateral Sclerosis Using Surface Electromyogram
X Zhang, P E Barkhaus, W Z Rymer, P Zhou
IEEE transactions on neural systems and rehabilitation engineering: a publication of the IEEE Engineering in Medicine and Biology Society 08/2013; 22(1)

The effect of involuntary motor activity on myoelectric pattern recognition: A case study with chronic stroke patients
X Zhang, Y Li, X Chen, G Li, W Z Rymer, P Zhou
Journal of Neural Engineering 07/2013; 10(4)

Motor unit pool organization examined via spike triggered averaging of the surface electromygram
X Hu, W Z Rymer, N L Suresh
Journal of Neurophysiology 05/2013; 110(5)

A Novel Myoelectric Pattern Recognition Strategy for Hand Function Restoration after Incomplete Cervical Spinal Cord Injury
J Liu, P Zhou
IEEE transactions on neural systems and rehabilitation engineering: a publication of the IEEE Engineering in Medicine and Biology Society 01/2013; 21(1):96-103

Alterations in upper limb muscle synergy structure in chronic stroke survivors
J Roh, W Z Rymer, E J Perreault, S B Yoo, R F Beer
Journal of Neurophysiology 11/2012; 109(3)

Duration of observation required in detecting fasciculation potentials in amyotrophic lateral sclerosis using high-density surface EMG
P Zhou, X Li, F Jahanmiri, W Z Rymer, P E Barkhaus
Journal of NeuroEngineering and Rehabilitation 10/2012; 9(1):78

Impaired motor unit control in paretic muscle post stroke assessed using surface electromyography: A preliminary report
X Hu, A K Suresh, X Li, W Z Rymer, N L Suresh
Conference proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 08/2012; 2012:4116-9

Using spike-triggered averaging to characterize motor unit twitch vectors in the first dorsal interosseous
N L Suresh, A Kuo, C J Heckman, W Z Rymer
Conference proceedings:  Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 08/2012; 2012:3604-7

Computing motor unit number index of the first dorsal interosseous muscle with two different contraction tasks
P Zhou, X Li, W Z Rymer
Medical Engineering & Physics 07/2012; 34(8):1209-12

A Simulation-Based Analysis of Motor Unit Number Index (MUNIX) Technique Using Motoneuron Pool and Surface Electromyogram Models
X Li, W Z Rymer, P Zhou
IEEE transactions on neural systems and rehabilitation engineering: a publication of the IEEE Engineering in Medicine and Biology Society 04/2012; 20(3):297-304

Impaired motor unit control in paretic muscle post stroke assessed using surface electromyography: A preliminary report
X Hu, A K Suresh, X Li, W Z Rymer, N L Suresh
Engineering in Medicine and Biology Society (EMBC), 2012 Annual International Conference of the IEEE; 01/2012

Robustness of muscle synergies underlying three-dimensional force generation at the hand in healthy humans
J Roh, W Z Rymer, R F Beer
Journal of Neurophysiology 01/2012; 107(8):2123-42

Alterations in spike amplitude distribution of the surface electromyogram post-stroke
X Li, A K Suresh, P Zhou, W Z Rymer
Conference proceedings:  Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 08/2011; 2011:7504-7

Characterizing the complexity of spontaneous motor unit patterns of amyotrophic lateral sclerosis using approximate entropy
P Zhou, P E Barkhaus, X Zhang, W Z Rymer
Journal of Neural Engineering 11/2011; 8(6)

Motor Unit Number Reductions in Paretic Muscles of Stroke Survivors
X Li, Y C Wang, N L Suresh, W Z Rymer, P Zhou
IEEE Transactions on Information Technology in Biomedicine 08/2011

Examination of motor unit control properties in stroke survivors using surface EMG decomposition: A preliminary report
N L Suresh, X Li, P Zhou, W Z Rymer
Conference proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 08/2011; 2011:8243-6

Characterization of the tendon vibration reflex response in hemi-spastic stroke individuals
N L Suresh, I Wang, C J Heckman, W Z Rymer
Conference proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 08/2011; 2011:2053-6

Surface electromyogram analysis of the direction of isometric torque generation by the first dorsal interosseous muscle
P Zhou, N L Suresh, W Z Rymer
Journal of Neural Engineering 06/2011; 8(3):036028

An Evaluation of Passive Properties of Spastic Muscles In Hemiparetic Stroke Survivors
M K Chardon, N L Suresh, W Z Rymer
Conference proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 08/2010; 2010:2993-6

Endpoint force fluctuations reveal flexible rather than synergistic patterns of muscle cooperation
J J Kutch, A Kuo, W Z Rymer
Journal of Neurophysiology 06/2010; 103(6):3535-46

Origins of Abnormal Excitability in Biceps Brachii Motoneurons of Spastic-Paretic Stroke Survivors
C J Mottram, N L Suresh, C J Heckman, M A Gorassini, W Z Rymer
Journal of Neurophysiology 08/2009; 102(4):2026-38

Nonlinear Spatial Filtering of Multichannel Surface Electromyogram Signals During Low Force Contractions
P Zhou, N L Suresh, Madeleine M Lowery, W Z Rymer
IEEE transactions on bio-medical engineering 04/2009; 56(7):1871-9

A Preliminary Study of Action Potential Propagation in Paretic Muscle of Stroke Survivors
J R Schieber, N L Suresh, W Z Rymer, P Zhou
Conference proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 01/2009; 2009:222-3

A New Method for Reflex Threshold Estimation in Spastic Muscles
MK Chardon, N L Suresh, W Z Rymer
Conference proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 01/2009; 2009:5300-3

Analysis of Surface EMG-force Relation of the First Dorsal Interosseous Muscle
K Murali, N L Suresh, R Stiller, W Z Rymer, P Zhou
Conference proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 01/2009; 2009:2960-2

Endpoint force fluctuations reveal flexible rather than synergistic patterns of muscle cooperation
J J Kutch, A Kuo, A M Bloch, W Z Rymer
Journal of Neurophysiology 10/2008; 100(5):2455-71

Abnormal EMG-force slope estimates in the first dorsal interosseous of hemiparetic stroke survivors
N L Suresh, P Zhou, W Z Rymer
Conference proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 02/2008; 2008:3562-5

Model Based Sensitivity Analysis of EMG–Force Relation with Respect to Motor Unit Properties: Applications to Muscle Paresis in Stroke
P Zhou, N L Suresh, W Z Rymer
Annals of Biomedical Engineering 10/2007; 35(9):1521-31

Analysis of the effects of firing rate and synchronization on spike-triggered averaging of multidirectional motor unit torque
J J Kutch, N L Suresh, A M Bloch, W Z Rymer
Journal of Computational Neuroscience 07/2007; 22(3):347-61

Excitatory synaptic potentials in spastic human motoneurons have a short rise-time
N L Suresh, M D Ellis, J Moore, H Heckman, W Z Rymer
Muscle & Nerve 07/2005; 32(1):99-103

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