585 results match your criteria impedance myography

Tensor electrical impedance myography identifies bulbardisease progression in amyotrophic lateral sclerosis.

Clin Neurophysiol 2022 May 5;139:69-75. Epub 2022 May 5.

Sheffield Institute for Translational Neuroscience, University of Sheffield, UK. Electronic address:

Objective: Electrical impedance myography (EIM) is a promising biomarker for amyotrophic lateral sclerosis (ALS). A key issue is how best to utilise the complex high dimensional, multi-frequency data output by EIM to fully characterise the progression of disease.

Methods: Muscle volume conduction properties were obtained from EIM recordings of the tongue across three electrode configurations and 14 input frequencies (76 Hz-625 kHz). Read More

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Muscle Mass Measurement Using Machine Learning Algorithms with Electrical Impedance Myography.

Sensors (Basel) 2022 Apr 18;22(8). Epub 2022 Apr 18.

Department of Computer Science and Information Engineering, Chaoyang University of Technology, Taichung 413310, Taiwan.

Sarcopenia is a wild chronic disease among elderly people. Although it does not entail a life-threatening risk, it will increase the adverse risk due to the associated unsteady gait, fall, fractures, and functional disability. The import factors in diagnosing sarcopenia are muscle mass and strength. Read More

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Modeling and simulation of needle electrical impedance myography in nonhomogeneous isotropic skeletal muscle.

IEEE J Electromagn RF Microw Med Biol 2022 Mar 22;6(1):103-110. Epub 2021 Jun 22.

Sanchez Research Lab, Department of Electrical and Computer Engineering, Sorenson Molecular Biotechnology Building, 36 South Wasatch Drive, University of Utah, Salt Lake City, UT 84112, USA.

Objective: Needle electrical impedance myography (EIM) is a recently developed technique for neuromuscular evaluation. Despite its preliminary successful clinical application, further understanding is needed to aid interpreting EIM outcomes in nonhomogeneous skeletal muscle measurements.

Methods: The framework presented models needle EIM measurements in a bidomain isotropic model. Read More

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Design and pilot testing of a 26-gauge impedance-electromyography needle in wild-type and ALS mice.

Muscle Nerve 2022 Jun 14;65(6):702-708. Epub 2022 Apr 14.

Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah, USA.

Introduction/aims: Needle impedance-electromyography (iEMG) is a diagnostic modality currently under development that combines intramuscular electrical impedance with concentric electromyography (EMG) in a single needle. We designed, manufactured, and tested a prototype iEMG needle in a cohort of wild-type (WT) and SOD1G93A amyotrophic lateral sclerosis (ALS) mice to assess its ability to record impedance and EMG data.

Methods: A new six-electrode, 26-gauge, iEMG needle was designed, manufactured and tested. Read More

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Altered electrical properties in skeletal muscle of mice with glycogen storage disease type II.

Sci Rep 2022 03 29;12(1):5327. Epub 2022 Mar 29.

Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, 02215, USA.

Electrical impedance methods, including electrical impedance myography, are increasingly being used as biomarkers of muscle health since they measure passive electrical properties of muscle that alter in disease. One disorder, Pompe Disease (Glycogen storage disease type II (GSDII)), remains relatively unstudied. This disease is marked by dramatic accumulation of intracellular myofiber glycogen. Read More

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A Wearable, Multi-Frequency Device to Measure Muscle Activity Combining Simultaneous Electromyography and Electrical Impedance Myography.

Sensors (Basel) 2022 Mar 2;22(5). Epub 2022 Mar 2.

Medical Information Technology, RWTH Aachen University, Pauwelsstr. 20, 52074 Aachen, Germany.

The detection of muscle contraction and the estimation of muscle force are essential tasks in robot-assisted rehabilitation systems. The most commonly used method to investigate muscle contraction is surface electromyography (EMG), which, however, shows considerable disadvantages in predicting the muscle force, since unpredictable factors may influence the detected force but not necessarily the EMG data. Electrical impedance myography (EIM) investigates the change in electrical impedance during muscle activities and is another promising technique to investigate muscle functions. Read More

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A Preliminary Exploration of the Placental Position Influence on Uterine Electromyography Using Fractional Modelling.

Sensors (Basel) 2022 Feb 22;22(5). Epub 2022 Feb 22.

NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal.

The uterine electromyogram, also called electrohysterogram (EHG), is the electrical signal generated by uterine contractile activity. The EHG has been considered an expanding technique for pregnancy monitoring and preterm risk evaluation. Data were collected on the abdominal surface. Read More

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February 2022

Electrical Properties of Lumbar Paraspinal Muscles in Young Adults With and Without Chronic Low Back Pain Based on Electrical Impedance Myography: A Cross-Sectional Study.

Front Neurol 2021 17;12:789589. Epub 2022 Feb 17.

Department of Rehabilitation Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.

Background: Lumbar paraspinal muscle (LPM) is important in spinal stabilization in patients with chronic low back pain (CLBP). However, the electrical properties of LPM in patients with CLBP remain unclear. Electrical impedance myography (EIM) is a novel and non-invasive technique that provides a simple quantitative evaluation of electrical properties of the LPM. Read More

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February 2022

Altered cerebrovascular regulation in low birthweight swine.

Comp Biochem Physiol A Mol Integr Physiol 2022 05 10;267:111163. Epub 2022 Feb 10.

Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, Canada. Electronic address:

Full-term low birthweight (LBW) offspring exhibit peripheral vascular dysfunction in the postnatal period; however, whether such impairments extend to the cerebrovasculature remains to be elucidated. We used a swine model to test the hypothesis that LBW offspring would exhibit cerebrovascular dysfunction at later stages of life. Offspring from 14 sows were identified as normal birthweight (NBW) or LBW and were assessed at 28 (similar to end of infancy) and 56 (similar to childhood) days of age. Read More

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A Novel Motion Recognition Method Based on Force Myography of Dynamic Muscle Contractions.

Front Neurosci 2021 13;15:783539. Epub 2022 Jan 13.

CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems, Shenzhen Institutes of Advanced Technology (SIAT), Chinese Academy of Sciences, Shenzhen, China.

Surface electromyogram-based pattern recognition (sEMG-PR) has been considered as the most promising method to control multifunctional prostheses for decades. However, the commercial applications of sEMG-PR in prosthetic control is still limited due to the ambient noise and impedance variation between electrodes and skin surface. In order to reduce these issues, a force-myography-based pattern recognition method was proposed. Read More

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January 2022

A Way of Bionic Control Based on EI, EMG, and FMG Signals.

Sensors (Basel) 2021 Dec 27;22(1). Epub 2021 Dec 27.

Department of Medical and Technical Information Technology, Bauman Moscow State Technical University, 105005 Moscow, Russia.

Creating highly functional prosthetic, orthotic, and rehabilitation devices is a socially relevant scientific and engineering task. Currently, certain constraints hamper the development of such devices. The primary constraint is the lack of an intuitive and reliable control interface working between the organism and the actuator. Read More

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December 2021

Determination of the Geometric Parameters of Electrode Systems for Electrical Impedance Myography: A Preliminary Study.

Sensors (Basel) 2021 Dec 24;22(1). Epub 2021 Dec 24.

Department of Medical and Technical Information Technology, Bauman Moscow State Technical University, 105005 Moscow, Russia.

The electrical impedance myography method is widely used in solving bionic control problems and consists of assessing the change in the electrical impedance magnitude during muscle contraction in real time. However, the choice of electrode systems sizes is not always properly considered when using the electrical impedance myography method in the existing approaches, which is important in terms of electrical impedance signal expressiveness and reproducibility. The article is devoted to the determination of acceptable sizes for the electrode systems for electrical impedance myography using the Pareto optimality assessment method and the electrical impedance signals formation model of the forearm area, taking into account the change in the electrophysical and geometric parameters of the skin and fat layer and muscle groups when performing actions with a hand. Read More

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December 2021

Muscle Electrical Impedance Properties and Activation Alteration After Functional Electrical Stimulation-Assisted Cycling Training for Chronic Stroke Survivors: A Longitudinal Pilot Study.

Front Neurol 2021 15;12:746263. Epub 2021 Dec 15.

Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China.

Electrical impedance myography (EIM) is a sensitive assessment for neuromuscular diseases to detect muscle inherent properties, whereas surface electromyography (sEMG) is a common technique for monitoring muscle activation. However, the application of EIM in detecting training effects on stroke survivors is relatively few. This study aimed to evaluate the muscle inherent properties and muscle activation alteration after functional electrical stimulation (FES)-assisted cycling training to chronic stroke survivors. Read More

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December 2021

A Pilot Study on Long-term Physiological Signal Monitoring using Anhydrous Viscoplastic Electrodes.

Annu Int Conf IEEE Eng Med Biol Soc 2021 11;2021:6767-6770

Electrocardiography (ECG) and Electromyogram (EMG) are widely used to help physicians to diagnose various diseases. Besides, long-term physiological signals monitoring is of great significance for circumstances where certain diseases may not be observed in short-term monitoring. At present, wet electrodes are widely used in the clinic and are considered as a standard method to acquire physiological signals in high fidelity. Read More

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November 2021

Evaluation of Skeletal Muscle Dysfunction Associated With Acute Inflammation by Electrical Impedance Myography: A Case Report on Skeletal Muscle Dysfunction After Cardiac Surgery and Literature Review.

Cureus 2021 Dec 4;13(12):e20166. Epub 2021 Dec 4.

Graduate School of Health Sciences, Okayama University, Okayama, JPN.

Electrical impedance myography (EIM) is an evaluation technique for skeletal muscles that uses electrical impedance technology. Recent reviews have shown that EIM is useful as a method to assess changes in skeletal muscle quality and quantity with aging. These may be utilized for functional changes in inflammatory skeletal muscles, such as disease and operation. Read More

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December 2021

Extracellular Vesicles From Women With Severe Preeclampsia Impair Vascular Endothelial Function.

Anesth Analg 2022 04;134(4):713-723

From the Department of Anesthesiology and Perioperative Medicine, Division of Molecular and Translational Biomedicine.

Background: Preeclampsia (PE) manifesting as hypertension and organ injury is mediated by vascular dysfunction. In biological fluids, extracellular vesicles (EVs) containing microRNA (miRNA), protein, and other cargo released from the placenta may serve as carriers to propagate injury, altering the functional phenotype of endothelial cells. PE has been consistently correlated with increased levels of placenta-derived EVs (pEVs) in maternal circulation. Read More

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A high-density 256-channel cap for dry electroencephalography.

Hum Brain Mapp 2022 03 19;43(4):1295-1308. Epub 2021 Nov 19.

Institute of Biomedical Engineering and Informatics, Technische Universität Ilmenau, Ilmenau, Germany.

High-density electroencephalography (HD-EEG) is currently limited to laboratory environments since state-of-the-art electrode caps require skilled staff and extensive preparation. We propose and evaluate a 256-channel cap with dry multipin electrodes for HD-EEG. We describe the designs of the dry electrodes made from polyurethane and coated with Ag/AgCl. Read More

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Interrater and Intrarater Reliability of Electrical Impedance Myography: A Comparison between Large and Small Handheld Electrode Arrays.

J Healthc Eng 2021 2;2021:7296322. Epub 2021 Nov 2.

University of Health and Rehabilitation Sciences, Qingdao, Shandong 266024, China.

The objective of this study was to evaluate the interrater and intrarater reliability of electrical impedance myography (EIM) using handheld sensors of different sizes. Electrical impedance myography of the biceps brachii muscle of twenty healthy individuals was performed by two raters using both large and small sensors. The procedures were also repeated 5 to 8 days after the first recording session. Read More

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Relationships between in vivo surface and ex vivo electrical impedance myography measurements in three different neuromuscular disorder mouse models.

PLoS One 2021 29;16(10):e0259071. Epub 2021 Oct 29.

Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, United States of America.

Electrical impedance myography (EIM) using surface techniques has shown promise as a means of diagnosing and tracking disorders affecting muscle and assessing treatment efficacy. However, the relationship between such surface-obtained impedance values and pure muscle impedance values has not been established. Here we studied three groups of diseased and wild-type (WT) animals, including a Duchenne muscular dystrophy model (the D2-mdx mouse), an amyotrophic lateral sclerosis (ALS) model (the SOD1 G93A mouse), and a model of fat-related atrophy (the db/db diabetic obese mouse), performing hind limb measurements using a standard surface array and ex vivo measurements on freshly excised gastrocnemius muscle. Read More

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December 2021

The Assessment of Upper-Limb Spasticity Based on a Multi-Layer Process Using a Portable Measurement System.

IEEE Trans Neural Syst Rehabil Eng 2021 3;29:2242-2251. Epub 2021 Nov 3.

Spasticity is a common disabling complication caused by the upper motor neurons dysfunction following neurological diseases such as stroke. Currently, the assessment of the spastic hypertonia triggered by stretch reflexes is manually performed by clinicians using perception-based clinical scales, however, their reliability is still questionable due to the inter-rater and intra-rater variability. In order to objectively quantify the complex spasticity phenomenon in post-stroke patients, this study proposed a multi-layer assessment system based on a novel measurement device. Read More

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November 2021

Electrical Impedance Myography in Health and Physical Exercise: A Systematic Review and Future Perspectives.

Front Physiol 2021 14;12:740877. Epub 2021 Sep 14.

Tecnocampus, Universitat Pompeu Fabra, Barcelona, Spain.

Electrical impedance myography (EIM) is a non-invasive method that provides information about muscle health and changes that occur within it. EIM is based on the analysis of three impedance variables: resistance, reactance, and the phase angle. This systematic review of the literature provides a deeper insight into the scope and range of applications of EIM in health and physical exercise. Read More

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September 2021

Quantifying the Changes of Mechanical and Electrical Properties of Paralyzed Muscle in Survivors With Cervical Spinal Cord Injury.

Front Neurol 2021 8;12:720901. Epub 2021 Sep 8.

Institute of Medical Research, Northwestern Polytechnical University, Xi'an, China.

Survivors with spinal cord injury (SCI) have neuromuscular deficits such as muscle atrophy that lead to functional impairments. This study utilized myotonometry and electrical impedance myography (EIM) to quantitatively evaluate the changes in muscle mechanical properties and compositions after SCI. This study adopted a cross-sectional design. Read More

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September 2021

Tensor electrical impedance myography identifies clinically relevant features in amyotrophic lateral sclerosis.

Physiol Meas 2021 11 2;42(10). Epub 2021 Nov 2.

Sheffield Institute for Translational Neuroscience, University of Sheffield, United Kingdom.

Electrical impedance myography (EIM) shows promise as an effective biomarker in amyotrophic lateral sclerosis (ALS). EIM applies multiple input frequencies to characterise muscle properties, often via multiple electrode configurations. Herein, we assess if non-negative tensor factorisation (NTF) can provide a framework for identifying clinically relevant features within a high dimensional EIM dataset. Read More

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November 2021

The Effect of Sleeve Pattern and Fit on E-Textile Electromyography (EMG) Electrode Performance in Smart Clothing Design.

Sensors (Basel) 2021 Aug 20;21(16). Epub 2021 Aug 20.

Department of Biophysics, Medical Faculty, Yeditepe University, 26 Ağustos Yerleşimi, İnönü Mah. Kayışdağı Cad., Ataşehir, Istanbul 34755, Turkey.

When e-textile EMG electrodes are integrated into clothing, the fit of the clothing on the body, and therefore its pattern and cut become important factors affecting the EMG signal quality in relation to the seamless contact between the skin and the e-textile electrode. The research so far on these effects was conducted on commercially available clothing or in tubular sleeve forms for arms. There is no study that investigated different clothing pattern and fit conditions and their effect on e-textile EMG electrode performance. Read More

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Body-powered variable impedance: An approach to augmenting humans with a passive device by reshaping lifting posture.

Sci Robot 2021 08;6(57)

Soft Robotics Research Center, Seoul National University, Seoul, Republic of Korea.

The movement patterns appropriate for exercise and manual labor do not always correspond to what people instinctively choose for better comfort. Without expert guidance, people can even increase the risk of injury by choosing a comfortable posture rather than the appropriate one, notably when lifting objects. Even in situations where squatting is accepted as a desirable lifting strategy, people tend to choose the more comfortable strategy of stooping or semisquatting. Read More

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Quantitative muscle ultrasound and electrical impedance myography in late onset Pompe disease: A pilot study of reliability, longitudinal change and correlation with function.

Mol Genet Metab Rep 2021 Sep 30;28:100785. Epub 2021 Jul 30.

Department of Pediatrics, Division of Medical Genetics, Duke University School of Medicine, Durham, NC, USA.

Background/objectives: Late-onset Pompe disease (LOPD) is slowly progressive, making it difficult to assess clinical change and response to interventions. In this study, quantitative muscle ultrasonography (QMUS) and electrical impedance myography (EIM) were evaluated as potential biomarkers.

Methods: 25 patients with confirmed LOPD were recruited from the Duke Pompe Clinic and evaluated with standard clinical measures, QMUS, standard EIM (sEIM) and hand-held EIM (hEIM). Read More

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September 2021

Dynamic Surface Electromyography Using Stretchable Screen-Printed Textile Electrodes.

IEEE Trans Neural Syst Rehabil Eng 2021 27;29:1661-1668. Epub 2021 Aug 27.

Objective: Wearable devices have created new opportunities in healthcare and sport sciences by unobtrusively monitoring physiological signals. Textile polymer-based electrodes proved to be effective in detecting electrophysiological potentials but suffer mechanical fragility and low stretch resistance. The goal of this research is to develop and validate in dynamic conditions cost-effective and easily manufacturable electrodes characterized by adequate robustness and signal quality. Read More

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October 2021

Targeted muscle effort distribution with exercise robots: Trajectory and resistance effects.

Med Eng Phys 2021 08 3;94:70-79. Epub 2021 Jul 3.

Mechanical Engineering Department, Cleveland State University, Cleveland, OH 44115, USA.

The objective of this work is to relate muscle effort distributions to the trajectory and resistance settings of a robotic exercise and rehabilitation machine. Muscular effort distribution, representing the participation of each muscle in the training activity, was measured with electromyography sensors (EMG) and defined as the individual activation divided by the total muscle group activation. A four degrees-of-freedom robot and its impedance control system are used to create advanced exercise protocols whereby the user is asked to follow a path against the machine's neutral path and resistance. Read More

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A Finite Element Analysis and Circuit Modelling Methodology for Studying Electrical Impedance Myography of Human Limbs.

IEEE Trans Biomed Eng 2022 01 23;69(1):244-255. Epub 2021 Dec 23.

Objective: Electrical impedance myography (EIM) measures bioimpedance over muscles. This paper proposes a circuit-based modelling methodology originated from finite element analysis (FEA), to emulate tissues and effects from anthropometric variations, and electrode placements, on EIM measurements. The proposed methodology is demonstrated on the upper arms and lower legs. Read More

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January 2022

Associations of fitness, motor competence, and adiposity with the indicators of physical activity intensity during different physical activities in children.

Sci Rep 2021 06 15;11(1):12521. Epub 2021 Jun 15.

Faculty of Sport and Health Sciences, University of Jyväskylä, PO Box 35, 40014, Jyväskylä, Finland.

We investigated the associations of peak oxygen uptake (V̇O), ventilatory threshold (VT), muscle strength, motor competence (MC), and adiposity with the indicators of PA intensity during different physical activities used to create absolute PA intensity cut-offs among 35 children 7-11-years-of-age. V̇O was defined as the highest V̇O achieved in the maximal cardiopulmonary exercise test (CPET) on a cycle ergometer, self-paced running, or running on a treadmill at 8 km/h. VT was defined from the CPET data. Read More

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