Higher Frequencies Do Not Enhance Muscle Force During Fatigue PDF Download
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Author: Byung Geun Jun
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
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Book Description
During contractions elicited by electrical stimulation before and after a voluntary fatigue task, significantly more force is lost at high versus low frequencies. This phenomenon has been termed 'low frequency fatigue'. The purpose of this study was to determine if progressively increasing the stimulation frequency during contraction would increase overall force output and reduce the rate of fatigue. This technique artificially generated neural activity in order to overcome lost functions of paralyzed, incontinent or sensory impaired persons. The study compared force and EMG parameters during a constant frequency train of 20Hz for 3 minutes to a train that increased linearly from 20Hz to 40Hz over the same time period. Ten subjects participated in this study and performed the two fatigue tests on different days. Six of the subjects returned for a third experiment to determine changes in the force frequency relation after a 3 minute voluntary sustained isometric fatiguing contraction of 45% maximum voluntary contraction (MVC). The force-frequency relationship shifted to the right with fatigue and significantly more force was lost at the low frequency than at the high frequencies. During the fatigue task experiments, average maximal voluntary contraction force (20 Hz: 47.8 ± 5.0N, 20-40 Hz: 53.2 ± 5.2 N) and the starting force at 20 Hz (20 Hz: 22.9 ± 3.1 N, 20-40 Hz: 23.3 ± 2.4 N) did not differ between experiment days. Surprisingly, there was no significant difference in the overall force time integral (20Hz: 3.25 ± 0.04 KNs, 20-40Hz: 3.40 ± 0.05 KNs) for the two stimulation protocols or the peak force at the end of the 3 min evoked contraction (20 Hz: 8.2 ± 1.8 N, 20-40 Hz: 7.6 ± 1.1 N). These data indicate that the force output is highly dependent on the starting frequency and minimally affected by the number of stimulation pulses delivered (20 Hz: 3600 pulses, 20-40 Hz: 5400 pulses) when stimulating within the physiological range.
Author: Byung Geun Jun
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
Get Book Here
Book Description
During contractions elicited by electrical stimulation before and after a voluntary fatigue task, significantly more force is lost at high versus low frequencies. This phenomenon has been termed 'low frequency fatigue'. The purpose of this study was to determine if progressively increasing the stimulation frequency during contraction would increase overall force output and reduce the rate of fatigue. This technique artificially generated neural activity in order to overcome lost functions of paralyzed, incontinent or sensory impaired persons. The study compared force and EMG parameters during a constant frequency train of 20Hz for 3 minutes to a train that increased linearly from 20Hz to 40Hz over the same time period. Ten subjects participated in this study and performed the two fatigue tests on different days. Six of the subjects returned for a third experiment to determine changes in the force frequency relation after a 3 minute voluntary sustained isometric fatiguing contraction of 45% maximum voluntary contraction (MVC). The force-frequency relationship shifted to the right with fatigue and significantly more force was lost at the low frequency than at the high frequencies. During the fatigue task experiments, average maximal voluntary contraction force (20 Hz: 47.8 ± 5.0N, 20-40 Hz: 53.2 ± 5.2 N) and the starting force at 20 Hz (20 Hz: 22.9 ± 3.1 N, 20-40 Hz: 23.3 ± 2.4 N) did not differ between experiment days. Surprisingly, there was no significant difference in the overall force time integral (20Hz: 3.25 ± 0.04 KNs, 20-40Hz: 3.40 ± 0.05 KNs) for the two stimulation protocols or the peak force at the end of the 3 min evoked contraction (20 Hz: 8.2 ± 1.8 N, 20-40 Hz: 7.6 ± 1.1 N). These data indicate that the force output is highly dependent on the starting frequency and minimally affected by the number of stimulation pulses delivered (20 Hz: 3600 pulses, 20-40 Hz: 5400 pulses) when stimulating within the physiological range.
Author: Ruth Porter
Publisher: John Wiley & Sons
ISBN: 047071512X
Category : Medical
Languages : en
Pages : 432
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Book Description
The Novartis Foundation Series is a popular collection of the proceedings from Novartis Foundation Symposia, in which groups of leading scientists from a range of topics across biology, chemistry and medicine assembled to present papers and discuss results. The Novartis Foundation, originally known as the Ciba Foundation, is well known to scientists and clinicians around the world.
Author: Roberto Merletti
Publisher: John Wiley & Sons
ISBN: 1118987020
Category : Science
Languages : en
Pages : 592
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Book Description
Reflects on developments in noninvasive electromyography, and includes advances and applications in signal detection, processing and interpretation Addresses EMG imaging technology together with the issue of decomposition of surface EMG Includes advanced single and multi-channel techniques for information extraction from surface EMG signals Presents the analysis and information extraction of surface EMG at various scales, from motor units to the concept of muscle synergies.
Author: Marc D. Binder
Publisher: Springer
ISBN: 9783540237358
Category : Medical
Languages : en
Pages : 4398
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Book Description
This 5000-page masterwork is literally the last word on the topic and will be an essential resource for many. Unique in its breadth and detail, this encyclopedia offers a comprehensive and highly readable guide to a complex and fast-expanding field. The five-volume reference work gathers more than 10,000 entries, including in-depth essays by internationally known experts, and short keynotes explaining essential terms and phrases. In addition, expert editors contribute detailed introductory chapters to each of 43 topic fields ranging from the fundamentals of neuroscience to fascinating developments in the new, inter-disciplinary fields of Computational Neuroscience and Neurophilosophy. Some 1,000 multi-color illustrations enhance and expand the writings.
Author: Institute of Medicine
Publisher: National Academies Press
ISBN: 0309132991
Category : Business & Economics
Languages : en
Pages : 510
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Book Description
Every year workers' low-back, hand, and arm problems lead to time away from jobs and reduce the nation's economic productivity. The connection of these problems to workplace activities-from carrying boxes to lifting patients to pounding computer keyboards-is the subject of major disagreements among workers, employers, advocacy groups, and researchers. Musculoskeletal Disorders and the Workplace examines the scientific basis for connecting musculoskeletal disorders with the workplace, considering people, job tasks, and work environments. A multidisciplinary panel draws conclusions about the likelihood of causal links and the effectiveness of various intervention strategies. The panel also offers recommendations for what actions can be considered on the basis of current information and for closing information gaps. This book presents the latest information on the prevalence, incidence, and costs of musculoskeletal disorders and identifies factors that influence injury reporting. It reviews the broad scope of evidence: epidemiological studies of physical and psychosocial variables, basic biology, biomechanics, and physical and behavioral responses to stress. Given the magnitude of the problem-approximately 1 million people miss some work each year-and the current trends in workplace practices, this volume will be a must for advocates for workplace health, policy makers, employers, employees, medical professionals, engineers, lawyers, and labor officials.
Author: Craig Williams
Publisher: Routledge
ISBN: 1134053517
Category : Science
Languages : en
Pages : 529
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Book Description
When human muscle fatigues, athletic performance becomes impaired. For those individuals suffering muscle or metabolic diseases the effects of muscle fatigue can make everyday tasks difficult. Understanding the scientific processes responsible for skeletal muscle fatigue is therefore central to the study of the physiology of sport, exercise and health. Written by a team of leading international exercise scientists, this book explores the mechanisms of muscle fatigue and presents a comprehensive survey of current research on this important topic. Examining the wide variety of protocols, assessment methods and exercise models used to study muscle fatigue, the book explores the differential effects of fatigue as influenced by: age gender fitness and training the use of ergogenic aids medical conditions including cerebral palsy, muscular dystrophy and glycogenosis. Human Muscle Fatigue covers both clinical and applied approaches in sport and exercise physiology and devotes an entire section to the conceptual framework underpinning research in this area, helping readers from a wide range of backgrounds to engage with the topic. Accessible and detailed, this book is a key text for students and practitioners working in exercise and sports science, medicine, physical therapy and health.
Author: Alison McConnell
Publisher: Elsevier Health Sciences
ISBN: 0702054550
Category : Medical
Languages : en
Pages : 403
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Book Description
Respiratory Muscle Training: theory and practice is the world’s first book to provide an "everything-you-need-to-know" guide to respiratory muscle training (RMT). Authored by an internationally-acclaimed expert, it is an evidence-based resource, built upon current scientific knowledge, as well as experience at the cutting-edge of respiratory training in a wide range of settings. The aim of the book is to give readers: 1) an introduction to respiratory physiology and exercise physiology, as well as training theory; 2) an understanding of how disease affects the respiratory muscles and the mechanics of breathing; 3) an insight into the disease-specific, evidence-based benefits of RMT; 4) advice on the application of RMT as a standalone treatment, and as part of a rehabilitation programme; and finally, 5) guidance on the application of functional training techniques to RMT. The book is divided into two parts – theory and practice. Part I provides readers with access to the theoretical building blocks that support practice. It explores the evidence base for RMT as well as the different methods of training respiratory muscles and their respective efficacy. Part II guides the reader through the practical implementation of the most widely validated form of RMT, namely inspiratory muscle resistance training. Finally, over 150 "Functional" RMT exercises are described, which incorporate a stability and/or postural challenge – and address specific movements that provoke dyspnoea. Respiratory Muscle Training: theory and practice is supported by a dedicated website (www.physiobreathe.com), which provides access to the latest information on RMT, as well as video clips of all exercises described in the book. Purchasers will also receive a three-month free trial of the Physiotec software platform (via www.physiotec.ca), which allows clinicians to create bespoke training programmes (including video clips) that can be printed or emailed to patients. Introductory overviews of respiratory and exercise physiology, as well as training theory Comprehensive, up-to-date review of respiratory muscle function, breathing mechanics and RMT Analysis of the interaction between disease and respiratory mechanics, as well as their independent and combined influence upon exercise tolerance Analysis of the rationale and application of RMT to over 20 clinical conditions, e.g., COPD, heart failure, obesity, mechanical ventilation Evidence-based guidance on the implementation of inspiratory muscle resistance training Over 150 functional exercises that incorporate a breathing challenge www.physiobreathe.com - access up-to-date information, video clips of exercises and a three-month free trial of Physiotec’s RMT exercise module (via www.physiotec.ca)
Author: Haruo Sugi
Publisher: Springer Science & Business Media
ISBN: 9780306478703
Category : Muscle cells
Languages : en
Pages : 720
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Book Description
This volume presents the proceedings of a muscle symposium, which was held as the Fourth Fujihara seminar on October 28 - November 1, 2002, at Hakone, Japan. This volume covers all fields of muscle biology, from molecules to humans. This book provides information about recent progress of muscle research as well as the problems that remain to be investigated. This volume will stimulate muscle investigators to design and perform novel experiments to clarify the mysteries in muscle contraction.
Author: Wolfgang Kemmler
Publisher: Frontiers Media SA
ISBN: 2889638375
Category :
Languages : en
Pages : 160
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Book Description
Author: Patricia A. Pierce
Publisher: Springer Science & Business Media
ISBN: 1489910166
Category : Science
Languages : en
Pages : 540
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Book Description
This volume describes the current state of our knowledge on the neurobiology of muscle fatigue, with consideration also given to selected integrative cardiorespiratory mechanisms. Our charge to the authors of the various chapters was twofold: to provide a systematic review of the topic that could serve as a balanced reference text for practicing health-care professionals, teaching faculty, and pre-and postdoctoral trainees in the biomedi cal sciences; and to stimulate further experimental and theoretical work on neurobiology. Key issues are addressed in nine interrelated areas: fatigue of single muscle fibers, fatigue at the neuromuscular junction, fatigue of single motor units, metabolic fatigue studied with nuclear magnetic resonance, fatigue of the segmental motor system, fatigue involving suprasegmental mechanisms, the task dependency of fatigue mechanisms, integrative (largely cardiorespiratory) systems issues, and fatigue of adapted systems (due to aging, under-and overuse, and pathophysiology). The product is a volume that provides compre of processes that operate from the forebrain to the contractile proteins.
