Distinction between computer workers with and without work-related neck-shoulder complaints based on multiple surface EMG parameters [An article from: International Journal of Industrial Ergonomics]

Distinction between computer workers with and without work-related neck-shoulder complaints based on multiple surface EMG parameters [An article from: International Journal of Industrial Ergonomics] Review

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This digital document is a journal article from International Journal of Industrial Ergonomics, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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The aim of this study was to investigate whether it is possible to distinguish between computer workers with (cases) and without (controls) work-related neck-shoulder complaints by combining multiple surface electromyography (EMG) parameters in a logistic regression model. Fourteen controls and 13 cases performed five tasks: a unilateral dynamic hand task, a typing task, an editing task, a mouse task and a stress task. EMG of the trapezius muscle was measured using multi-channel electrode arrays. Root-mean-square value and median power frequency, the number of motor unit action potentials (MUAPs) per second and MUAP shape properties were assessed. Logistic regression models were developed for each task with data from ten controls and nine cases. The mouse task resulted in the most discriminative model with correct classification of 89% (jackknife evaluation). MUAP-related parameters were selected as most discriminative. Explorative evaluation with the remaining subjects resulted in a sensitivity and specificity of 3 out of 4 in both groups. In conclusion, a combination of multiple surface EMG parameters was capable of distinguishing computer workers with and without neck-shoulder complaints in a small pilot sample. Relevance to industry: The results are promising for development of an objective assessment method that can identify workers who are at risk to develop chronic neck-shoulder complaints.

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Mar 20, 2012 03:22:33

Emgs: Webster's Facts and Phrases

Emgs: Webster's Facts and Phrases Review

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Ever need a fact or quotation on "emgs"? Designed for speechwriters, journalists, writers, researchers, students, professors, teachers, historians, academics, scrapbookers, trivia buffs and word lovers, this is the largest book ever created for this word. It represents a compilation of "single sentences" and/or "short paragraphs" from a variety of sources with a linguistic emphasis on anything relating to the term "emgs," including non-conventional usage and alternative meanings which capture ambiguities. This is not an encyclopedic book, but rather a collage of statements made using the word "emgs," or related words (e.g. inflections, synonyms or antonyms). This title is one of a series of books that considers all major vocabulary words. The entries in each book cover all parts of speech (noun, verb, adverb or adjective usage) as well as use in modern slang, pop culture, social sciences (linguistics, history, geography, economics, sociology, political science), business, computer science, literature, law, medicine, psychology, mathematics, chemistry, physics, biology and other physical sciences. This data dump results in many unexpected examples for "emgs," since the editorial decision to include or exclude terms is purely a computer-generated linguistic process. The resulting entries are used under license or with permission, used under fair use conditions, used in agreement with the original authors, or are in the public domain.

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Mar 16, 2012 01:07:22

Electromyography and Neuromuscular Disorders: Clinical-Electrophysiologic Correlations, Textbook with CD-ROM

Electromyography and Neuromuscular Disorders: Clinical-Electrophysiologic Correlations, Textbook with CD-ROM Review

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This New Edition delivers, in a straightforward manner, all of the information readers need to understand and interpret electrodiagnostic studies. It emphasizes clinical/neurophysiological correlations and uses a practical, hands-on, interactive approach throughout. With new chapters on electrical safety and the use of EMG in the ICU-and the inclusion of two bonus CDs with over 75 EMG waveforms-this resource continues to be the single source to consult for guidance on the clinical and electrophysiological evaluation of disorders of the peripheral nervous system.

• Features case studies at the end of each chapter.
• Provides a wealth of tables that summarize guidelines for the evaluation of most neuromuscular disorders as well as tables that highlight the results of nerve conduction studies and the electromyography for that particular patient.
• Provides clear, original photographs that emphasize correct needle placement.

• Delivers new chapters on electrical safety (including absolute and relative contraindications for EMG and NCS), the use of EMGs in the ICU, and basic statistics for electrodiagnostic studies
• Includes new bonus CDs with over 70 waveforms, enabling readers to see and hear all of the waveforms discussed in the text.
• Provides new discussions of pediatric EMG.
• Discusses new disorders such as paralytic poliomyelitis caused by West Nile virus.

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• Easy EMG
• Anatomical Guide for the Electromyographer: The Limbs and Trunk
• Physical Medicine and Rehabilitation Board Review
• Aids to the Examination of the Peripheral Nervous System, 5e
• Anatomical Guide For The Electromyographer: The Limbs And Trunk

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Mar 15, 2012 00:09:55

Velocity-dependent EMG activity of masseter and sternocleidomastoideus muscles during a ballistic arm thrusting movement [An article from: Human Movement Science]

Velocity-dependent EMG activity of masseter and sternocleidomastoideus muscles during a ballistic arm thrusting movement [An article from: Human Movement Science] Review

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This digital document is a journal article from Human Movement Science, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Two experiments were conducted to investigate the functional relationship between the general somatic motor function and the oral motor function. In Experiment 1, we analyzed the relationship between the amount of masseter muscle (MSS) activity and the velocity of a ballistic, 'karate-do' arm thrusting movement (ThrMov). ThrMov velocity was measured from video images taken with a high-speed CCD camera at a frequency of 500Hz. EMGs of MSS and sternocleidomastoideus (SCM) muscles as well as other related muscles were recorded simultaneously with video images in 6 varsity 'karate-do' athletes. Pearson's correlation coefficients were calculated between EMG amplitude and movement velocity. EMG activity of MSS as well as the other muscles increased as a function of ThrMov velocity in all participants, as evidenced by highly significant (p<.01) correlation coefficients, ranging from .64 to .87 (mean: .75). MSS EMG activity attained during ThrMovs performed at maximum velocity ranged between 14.6% and 113.8% of this muscle's MVC (45.7+/-39.3% MVC, mean+/-SD). SCM was also strongly active and closely associated with MSS. Besides changes in amount of EMG activity, it was further found that R-MSS EMG onset progressively shifted to the earlier phase of the ThrMov as ThrMov velocity increased. EMG onset time of R-MSS as well as R- and L-SCMs was negatively correlated with ThrMov velocity; when performed at maximum velocity MSS activation preceded the start of ThrMov by more than 100ms, whereas MSS was recruited last at ~150ms after the start of ThrMov when performed at moderate speed (~50% of maximum). In Experiment 2, the effects of head movement relative to the trunk on R-MSS and SCMs EMG activity were tested in both gazing and sidelong glancing conditions. A much smaller head rotation relative to the trunk was necessary during the ThrMov in the sidelong glancing condition compared to the gazing condition. R-MSS EMG activity was affected significantly by the difference between these conditions and decreased by 5.2% MVC in the sidelong glancing condition compared to the gazing condition. In association with the change in requirement for head movement between those conditions, EMG balance between the bilateral SCMs changed substantially. Finally, marked muscle activity during ThrMov was found in the MSS that was not directly involved in performing this movement, indicating a form of 'remote facilitation'.

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Mar 13, 2012 11:52:15

Clinical Emg for Surface Recordings

Clinical Emg for Surface Recordings Review

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For many advanced readers experienced in EMG and/or EMG Biofeedback, this book is an essential lto expand their horizons. For the novice, it is an excellent part of the trianing required to keep up to datge on these fields. Scientific, but not dry and obscure, the book will b e a happy companion for all who become acquainted with it. In short, it is a fine book that takes a prominent place among the top books on the subject. Just part of what is included is static and dynamic/kinesiological EMG assessment of pain and other muscle-related problems.

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Mar 11, 2012 17:26:08

Introduction to Surface Electromyography, Second Edition

Introduction to Surface Electromyography, Second Edition Review

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A comprehensive resource for health professions students and practitioners, including physical and occupational therapists, chiropractors, and behavioral medicine students, Cram's Introduction to Surface Electromyography clearly explains how to use SEMG to treat a variety of neuromuscular conditions. It covers the development of SEMG, instrumentation, assessment, and treatment, and features a detailed atlas for electrode placement. This updated edition includes expanded "quick reference" items created by Glenn Kasman, as well as a new chapter on Assessment and Treatment of Neuromuscular Disorders. The chapter on Dynamic Assessment and Treatment of Musculoskeletal Problems has also been updated and revised. With a quick reference section and an atlas including line drawings and color photographs, this text is a valuable resource for health professions students and practitioners.

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• Practical Approach to Electromyography: An Illustrated Guide for Clinicians
• Biofeedback: A Practitioner's Guide
• Essentials of Electromoyograhy
• Therapeutic Management of Incontinence and Pelvic Pain: Pelvic Organ Disorders
• Skeletal Muscle Structure, Function, and Plasticity

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Mar 08, 2012 22:59:04

Peripheral Neurology: Case Studies

Peripheral Neurology: Case Studies Review

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Peripheral Neurology was the first book to innovatively utilize case presentations as a vehicle to teach peripheral neurology. In fact, it was the first to categorize the field of peripheral neurology, as most other neurology texts concentrated on diseases of the central nervous system. This case approach has since been emulated in many other texts and on various web sites. Emphasizing the clinical condition rather than electrodiagnostic technique, each topic is thoroughly addressed, first in the Fundamental Concepts of Part I, and then in multiple Case Studies presented in Part II. The reader is able to simulate a true clinical environment where a diagnosis has to be arrived at with no organizational clues from the text. Formulating conclusions by analyzing the history, physical, and laboratory data, and linking from case to related case, this is the only text which allows this type of "interactive" reading. The book addresses many rare entities that the author is able to present based on his 30-years of experience.

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• EMG Secrets, 1e
• Electromyography and Neuromuscular Disorders: Clinical-Electrophysiologic Correlations, Textbook with CD-ROM
• Easy EMG
• Electromyography in Clinical Practice: A Case Study Approach, 2e
• Anatomical Guide For The Electromyographer: The Limbs And Trunk

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Mar 03, 2012 04:53:37