Search Results - "Ellis, Michael D."

Progressive recruitment of contralesional cortico‐reticulospinal pathways drives motor impairment post stroke by McPherson, Jacob G., Chen, Albert, Ellis, Michael D., Yao, Jun, Heckman, C. J., Dewald, Julius P. A.

“…Key points Activation of the shoulder abductor muscles in the arm opposite a unilateral brain injury causes involuntary increases in elbow, wrist and finger…”
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Flexion Synergy Overshadows Flexor Spasticity During Reaching in Chronic Moderate to Severe Hemiparetic Stroke by Ellis, Michael D, Schut, Ingrid, Dewald, Julius P.A

“…Highlights • Robotic movement analysis disentangles flexion synergy from spasticity during reaching in stroke. • Flexion synergy eclipses flexor spasticity…”
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Shoulder abduction-induced reductions in reaching work area following hemiparetic stroke : neuroscientific implications by SUKAL, Theresa M, ELLIS, Michael D, DEWALD, Julius P. A

“…A stroke-related loss of corticospinal and corticobulbar pathways is postulated to result in an increased use of remaining neural substrates such as…”
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Applying LDA-based pattern recognition to predict isometric shoulder and elbow torque generation in individuals with chronic stroke with moderate to severe motor impairment by Kopke, Joseph V, Hargrove, Levi J, Ellis, Michael D

“…Abnormal synergy is a major stroke-related movement impairment that presents as an unintentional contraction of muscles throughout a limb. The flexion synergy,…”
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Coupling of shoulder joint torques in individuals with chronic stroke mirrors controls, with additional non-load-dependent negative effects in a combined-torque task by Kopke, Joseph V, Hargrove, Levi J, Ellis, Michael D

“…After stroke, motor control is often negatively affected, leaving survivors with less muscle strength and coordination, increased tone, and abnormal synergies…”
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Progressive Abduction Loading Therapy with Horizontal-Plane Viscous Resistance Targeting Weakness and Flexion Synergy to Treat Upper Limb Function in Chronic Hemiparetic Stroke: A Randomized Clinical Trial by Ellis, Michael D, Carmona, Carolina, Drogos, Justin, Dewald, Julius P A

“…Progressive abduction loading therapy has emerged as a promising exercise therapy in stroke rehabilitation to systematically target the loss of independent…”
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Neuromodulatory Inputs to Motoneurons Contribute to the Loss of Independent Joint Control in Chronic Moderate to Severe Hemiparetic Stroke by McPherson, Jacob G, Ellis, Michael D, Harden, R Norman, Carmona, Carolina, Drogos, Justin M, Heckman, Charles J, Dewald, Julius P A

“…In chronic hemiparetic stroke, increased shoulder abductor activity causes involuntary increases in elbow, wrist, and finger flexor activation, an abnormal…”
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Altered Neuromodulatory Drive May Contribute to Exaggerated Tonic Vibration Reflexes in Chronic Hemiparetic Stroke by McPherson, Jacob G, McPherson, Laura M, Thompson, Christopher K, Ellis, Michael D, Heckman, Charles J, Dewald, Julius P A

“…Exaggerated stretch-sensitive reflexes are a common finding in elbow flexors of the contralesional arm in chronic hemiparetic stroke, particularly when muscles…”
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Shear wave ultrasound elastography of the biceps brachii can be used as a precise proxy for passive elbow torque in individuals with hemiparetic stroke by Ellis, Michael D., Gurari, Netta, Gerritsen, Ninette T. A., Lee, Sabrina M., Wang, Amy, Dewald, Julius P. A.

“…Muscle tissue is prone to changes in composition and architecture following stroke. Changes in muscle tissue of the extremities are thought to increase…”
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Impact of gravity loading on post-stroke reaching and its relationship to weakness by Beer, Randall F., Ellis, Michael D., Holubar, Bradley G., Dewald, Julius P.A.

“…The ability to extend the elbow following stroke depends on the magnitude and direction of torques acting at the shoulder. The mechanisms underlying this link…”
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Position-dependent torque coupling and associated muscle activation in the hemiparetic upper extremity by ELLIS, Michael D, ACOSTA, Ana Maria, JUN YAO, DEWALD, Julius P. A

“…Previous studies have demonstrated abnormal joint torque coupling and associated muscle coactivations of the upper extremity in individuals with unilateral…”
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Modifiability of abnormal isometric elbow and shoulder joint torque coupling after stroke by Ellis, Michael D., Holubar, Bradley G., Acosta, Ana Maria, Beer, Randall F., Dewald, Julius P. A.

“…Unlike individuals with mild stroke, individuals with severe stroke are constrained to stereotypical movement patterns attributed to abnormal coupling of…”
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Determining User Intent of Partly Dynamic Shoulder Tasks in Individuals With Chronic Stroke Using Pattern Recognition by Kopke, Joseph V., Ellis, Michael D., Hargrove, Levi J.

“…Stroke remains the leading cause of long-term disability in the US. Although therapy can achieve limited improvement of paretic arm use and performance,…”
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Robotic quantification of upper extremity loss of independent joint control or flexion synergy in individuals with hemiparetic stroke: a review of paradigms addressing the effects of shoulder abduction loading by Ellis, Michael D, Lan, Yiyun, Yao, Jun, Dewald, Julius P A

“…Unsupported or "against-gravity" reaching and hand opening movements are greatly impaired in individuals with hemiparetic stroke. The reduction in reaching…”
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Neck rotation modulates flexion synergy torques, indicating an ipsilateral reticulospinal source for impairment in stroke by Ellis, Michael D, Drogos, Justin, Carmona, Carolina, Keller, Thierry, Dewald, Julius P A

“…The effect of reticular formation excitability on maximum voluntary torque (MVT) generation and associated muscle activation at the shoulder and elbow was…”
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Progressive Shoulder Abduction Loading is a Crucial Element of Arm Rehabilitation in Chronic Stroke by Ellis, Michael D., Sukal-Moulton, Theresa, Dewald, Julius P. A.

“…Background. Total reaching range of motion (work area) diminishes as a function of shoulder abduction loading in the paretic arm in individuals with chronic…”
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Reply from Jacob Graves McPherson, Albert Chen, Michael D. Ellis, Jun Yao, C. J. Heckman and Julius P. A. Dewald by McPherson, Jacob Graves, Chen, Albert, Ellis, Michael D., Yao, Jun, Heckman, C. J., Dewald, Julius P. A.

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Therapeutic Systems and Technologies: State-of-the-Art Applications, Opportunities, and Challenges by Almekkawy, Mohamed, Zderic, Vesna, Chen, Jie, Ellis, Michael D., Haemmerich, Dieter, Holmes, David R., Linte, Cristian A., Panescu, Dorin, Pearce, John, Prakash, Punit

“…In this review, we present current state-of-the-art developments and challenges in the areas of thermal therapy, ultrasound tomography, image-guided therapies,…”
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Commentary on “The Effects of Physical Activity on Prescription in Persons With Transient Ischemic Attack—a Randomized Controlled Study” by Ellis, Michael D, Lane, Heather Pepper

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Overcoming Abnormal Joint Torque Patterns in Paretic Upper Extremities Using Triceps Stimulation by Keller, Thierry, Ellis, Michael D., Dewald, Julius P.A.

“…:  The goal of this research project was to quantitatively assess whether transcutaneous triceps stimulation can overcome the expression of abnormal torque…”
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