• Stroke Survivors
    • William Zev Rymer
    • William Zev Rymer: Influence Statistics

      William Zev Rymer

      William Zev Rymer

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      Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, United States of America | Shirley Ryan AbilityLab (formerly the Rehabilitation Institute ...

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      William Zev Rymer:Expert Impact

      Concepts for whichWilliam Zev Rymerhas direct influence:Stroke survivors,Motor unit,Paretic leg,Spinal cord,Paretic muscles,Spinal cord injury,Weight shift,Chronic stroke.

      William Zev Rymer:KOL impact

      Concepts related to the work of other authors for whichfor which William Zev Rymer has influence:Spinal cord,Stroke patients,Muscle synergies,Motor unit,Upper limb,Cerebral palsy,Electrical stimulation.

      KOL Resume for William Zev Rymer


      Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, United States of America

      Legs and Walking Lab, Shirley Ryan AbilityLab, Chicago, Illinois.

      Arms and Hand Laboratory, Shirley Ryan Ability Lab, Chicago, IL, United States


      Department of Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University

      Legs and Walking Lab, Shirley Ryan AbilityLab, Chicago, IL, USA

      Shirley Ryan Ability Lab


      Shirley Ryan Ability Lab, Northwestern University, Chicago, IL 60611, United States of America

      Department of Physiology, Northwestern University, Chicago, IL, United States

      Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA


      Single Motor Unit Lab, Shirley Ryan AbilityLab, 355 E. Erie Street, Floor 21, Chicago, IL 60611 USA

      Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, Illinois; Shirley Ryan AbilityLab, Chicago, Illinois.

      Arms and Hands Lab, Shirley Ryan AbilityLab, Chicago, IL


      Shirley Ryan AbilityLab, Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, 60611, IL


      Northwestern University, Evanston, USA

      Shirley Ryan AbilityLab, Chicago, IL, United States


      Rehabilitation Institute of Chicago, Department of Physical Medicine and Rehabilitation Physiology, Biomedical Engineering at Northwestern University


      Northwestern University, Evanston, IL, 60208, USA

      Rehabilitation Institute of Chicago, Sensory Motor Performance Program

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      Sample of concepts for which William Zev Rymer is among the top experts in the world.
      Concept World rank
      poststroke spasticity subset #1
      aih ankle strength #1
      spinal neurons target #1
      function reflex severity #1
      reflex stiffness time #1
      step abrupt condition #1
      strokeimpaired muscle rest #1
      mechanically sensitive afferents #1
      joint stiffness decrease #1
      finger extensions #1
      training study participants #1
      sw velocity muscles #1
      equifinality property #1
      spasticity separate measures #1
      measurement arm guide #1
      delays reflex onset #1
      kinetic deficits thumb #1
      spasticity ocular muscles #1
      imagined movement initiation #1
      thumb deficits #1
      control algorithms error #1
      comparison reflex responses #1
      reflex torque #1
      ashworth scale tendon #1
      pelvis perturbation retention #1
      recruitment pic activation #1
      skeletal paresis reflex #1
      time neuromuscular properties #1
      mechatronic assessment #1
      semg contralateral #1
      slope fascicle #1
      cold block ramp #1
      recruitment force #1
      discharge rate stimulation #1
      grip initiation termination #1
      12 weeks b02 #1
      oscillations neuromuscular #1
      muscles chronic #1
      reflex responses subject #1
      individual muscles muscle #1
      antagonist biceps #1
      muscle fatigue decerebrate #1
      higher firing rates #1
      varied condition #1
      emg delsys #1
      signal subspace noise #1
      damping actions #1
      reorganization degree #1
      muscle paresis stroke #1
      specificity skeletal sensitivity #1
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      Prominent publications by William Zev Rymer

      KOL-Index: 12967

      OBJECTIVE: To determine whether applying a mediolateral corrective force to the pelvis during treadmill walking would enhance muscle activity of the paretic leg and improve gait symmetry in individuals with post-stroke hemiparesis.

      METHODS: Fifteen subjects with post-stroke hemiparesis participated in this study. A customized cable-driven robotic system based over a treadmill generated a mediolateral corrective force to the pelvis toward the paretic side during early stance phase. Three ...

      Known for Paretic Leg | Corrective Force | Treadmill Walking | Individuals Post | Pelvis Stroke
      KOL-Index: 12241

      Motor unit number index (MUNIX) measurement has recently achieved increasing attention as a tool to evaluate the progression of motoneuron diseases. In our current study, the sensitivity of the MUNIX technique to changes in motoneuron and muscle properties was explored by a simulation approach utilizing variations on published motoneuron pool and surface electromyogram (EMG) models. Our simulation results indicate that, when keeping motoneuron pool and muscle parameters unchanged and ...

      Known for Motor Unit | Motoneuron Pool | Skeletal Muscle | Surface Electromyogram | Munix Technique
      KOL-Index: 12151

      We studied the patterns of EMG activity in elbow muscles in three normal human subjects. The myoelectrical activity of 7-10 muscles that act across the human elbow joint was simultaneously recorded with intramuscular electrodes during isometric joint torques exerted over a range of directions. These directions included flexion, extension, varus (internal humeral rotation), valgus (external humeral rotation), and several intermediate directions. The forces developed at the wrist covered a ...

      Known for Elbow Muscles | Emg Activity | Isometric Contractions | Joint Torque | Long Head
      KOL-Index: 12095

      1. We studied the patterns of electromyographic (EMG) activity in elbow muscles of 14 normal human subjects. The activity of five muscles that act in flexion-extension and forearm supination-pronation was simultaneously recorded during isometric voluntary torque generation, in which torques generated in a plane orthogonal to the long axis of the forearm were voluntarily coupled with torques generated about the long axis of the forearm (i.e., supination-pronation). 2. When forearm ...

      Known for Biceps Brachii | Muscle Activation | Emg Activity | Human Elbow | Isometric Torque
      KOL-Index: 11969

      Recent advances in high-density surface electromyogram (EMG) decomposition have made it a feasible task to discriminate single motor unit activity from surface EMG interference patterns, thus providing a noninvasive approach for examination of motor unit control properties. In the current study, we applied high-density surface EMG recording and decomposition techniques to assess motor unit firing behavior alterations poststroke. Surface EMG signals were collected using a 64-channel 2-D ...

      Known for Motor Unit | Surface Emg | Contralateral Muscles | Firing Behavior | Muscle Contraction
      KOL-Index: 11836

      OBJECTIVE: To evaluate the effects of repeated, externally imposed, flexion-extension movements of the elbow on the resulting stretch reflex response in hemiparetic spastic brain-injured patients. These effects were compared within a recording session and across sessions for the same subject to determine the impact of movement history on the quantification of spastic hypertonia using the stretch reflex response.

      DESIGN: Twenty to 30 sequential, constant velocity flexion-extension ...

      Known for Stretch Reflex | Spastic Hypertonia | Elbow Flexors | Passive Movements | Flexion Extension
      KOL-Index: 11604

      The objective of this study was to assess whether there is evidence of motor unit loss in muscles paralyzed by spinal cord injury (SCI), using a measurement called motor unit number index (MUNIX). The MUNIX technique was applied in SCI (n=12) and neurologically intact (n=12) subjects. The maximum M waves and voluntary surface electromyography (EMG) signals at different muscle contraction levels were recorded from the first dorsal interosseous (FDI) muscle in each subject. The MUNIX ...

      Known for Motor Unit | Spinal Cord Injury | Paralyzed Muscles | Munix Values | Emg Measurements
      KOL-Index: 11602

      The flexion reflex can be elicited via stimulation of skin, muscle, and high-threshold afferents inducing a generalized flexion of the limb. In spinalized animal models this reflex is quite prominent and is strongly modulated by actions of hip proprioceptors. However, analogous actions on the flexion reflex in spinal cord injured (SCI) humans have not yet been examined. In this study, we investigated the effects of imposed static hip angle changes on the flexion reflex in ten motor ...

      Known for Flexion Reflex | Spinal Cord | Sural Nerve | Ipsilateral Tibialis | Lateral Malleolus
      KOL-Index: 11382

      OBJECTIVE: The objective of this study was to help assess complex neural and muscular changes induced by stroke using power spectral analysis of surface electromyogram (EMG) signals.

      METHODS: Fourteen stroke subjects participated in the study. They were instructed to perform isometric voluntary contractions by abducting the index finger. Surface EMG signals were collected from the paretic and contralateral first dorsal interosseous (FDI) muscles with forces ranging from 30% to 70% ...

      Known for Stroke Survivors | Surface Electromyography | Paretic Muscle | Spectral Analysis | Contraction Levels
      KOL-Index: 11155

      INTRODUCTION: The purpose of our study was to examine relations among spasticity, weakness, force variability, and sustained spontaneous motor unit discharges in spastic-paretic biceps brachii muscles in chronic stroke.

      METHODS: Ten chronic stroke subjects produced submaximal isometric elbow flexion force on impaired and non-impaired sides. Intramuscular EMG (iEMG) was recorded from biceps and triceps brachii muscles.

      RESULTS: We observed sustained spontaneous motor unit discharges in ...

      Known for Chronic Stroke | Force Variability | Spasticity Weakness | Biceps Brachii | Motor Unit
      KOL-Index: 10921

      The role of the forearm (extrinsic) finger flexor muscles in initiating rotation of the metacarpophalangeal (MCP) joint and in coordinating flexion at the MCP, the proximal interphalangeal (PIP), and distal interphalangeal (DIP) joints remains a matter of some debate. To address the biomechanical feasibility of the extrinsic flexors performing these actions, a computer simulation of the index finger was created. The model consisted of a planar open-link chain comprised of three revolute ...

      Known for Flexor Muscles | Mcp Pip | Skeletal Range | Finger Joint | Computer Simulation
      KOL-Index: 10584

      BACKGROUND: Neural plasticity may contribute to motor recovery following spinal cord injury (SCI). In rat models of SCI with respiratory impairment, acute intermittent hypoxia (AIH) strengthens synaptic inputs to phrenic motor neurons, thereby improving respiratory function by a mechanism known as respiratory long-term facilitation. Similar intermittent hypoxia-induced facilitation may be feasible in somatic motor pathways in humans.

      OBJECTIVE: Using a randomized crossover design, the ...

      Known for Motor Function | Acute Intermittent Hypoxia | Sci Aih | Incomplete Spinal | Cord Injury
      KOL-Index: 10526

      This study compares the kinematic and kinetic characteristics of constrained and free upper limb movements in eight subjects with chronic hemiparesis. Movements of the dominant and nondominant limbs were also examined in five control subjects. Rapid movements were performed in the horizontal plane from a central starting point to five targets located to require various combinations of flexion/extension rotations at the elbow and shoulder. Support of the upper limb against gravity loading ...

      Known for Arm Movements | Elbow Shoulder | Chronic Hemiparesis | Paretic Limb | Constrained Condition
      KOL-Index: 10464

      OBJECTIVES: To investigate the modulation of the soleus H reflex in spinal cord injured (SCI) subjects resulting from imposed changes in hip angle and to establish whether changes in H reflex amplitude co-vary with changes in reflex latency and duration.

      METHODS: H reflexes were recorded using conventional methods in 7 SCI subjects in the supine position. The right leg was secured by a leg brace and positioned at various angles of hip flexion (30 degrees, 40 degrees ) and at 10 degrees ...

      Known for Spinal Cord | Hip Angle | Reflex Amplitude | Sci Subjects | 10 Degrees

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      Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, United States of America | Shirley Ryan AbilityLab (formerly the Rehabilitation Institute of Chicago), Chicago, IL, United States; Department of Physical Medicine a

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