The Study of Voluntary Activation and Force Production Relationships and Responses to Varied Isometric Strength Training Parameters During Fatiguing and Non-fatiguing Test Protocols PDF Download
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Author: David Monte Williams
Publisher:
ISBN:
Category : Arm
Languages : en
Pages : 162
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Book Description
The global intent of this research was to confirm the validity of the interpolated twitch technique (ITT) to voluntary torque model (first study) and then to utilize this technique in developing definitive criterion measures enhancing the study of training strategies on central fatigue (second study) and velocity specific (third study) voluntary activation (VA) and force production outcomes. The first study assessed the contribution of non-stimulated synergists to the non-linearity of the ITT voluntary torque relationship for elbow flexion contraction. Since multiple synergist stimulation was found not to significantly improve the ITT to voluntary torque relationship, follow-up pilot work was conducted in which the quadriceps femoris was identified as a valid ITT test model muscle. The first training study investigated the effects of high volume, maximum voluntary isometric contraction (MVIC) resistance training of the quadriceps femoris on MVIC levels of force and VA prior to, during, and recovery from a standardized fatigue test protocol.
Author: David Monte Williams
Publisher:
ISBN:
Category : Arm
Languages : en
Pages : 162
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Book Description
The global intent of this research was to confirm the validity of the interpolated twitch technique (ITT) to voluntary torque model (first study) and then to utilize this technique in developing definitive criterion measures enhancing the study of training strategies on central fatigue (second study) and velocity specific (third study) voluntary activation (VA) and force production outcomes. The first study assessed the contribution of non-stimulated synergists to the non-linearity of the ITT voluntary torque relationship for elbow flexion contraction. Since multiple synergist stimulation was found not to significantly improve the ITT to voluntary torque relationship, follow-up pilot work was conducted in which the quadriceps femoris was identified as a valid ITT test model muscle. The first training study investigated the effects of high volume, maximum voluntary isometric contraction (MVIC) resistance training of the quadriceps femoris on MVIC levels of force and VA prior to, during, and recovery from a standardized fatigue test protocol.
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: Alexander R. Lind
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Results have been obtained on the development of isometric fatigue in muscle after fatiguing and non-fatiguing bouts of isometric exercise in male human subjects. Change in maximum voluntary contraction (MVC) under these conditions showed that during isometric contraction at 5-10 percent of MVC and at 25 to 70 percent MVC, there was a linear fall in strength throughout the isometric effort. This was particularly surprising at 5-10 percent MVC since these levels are considered to be non-fatiguing. Endurance was reduced at 25 to 40 percent MVC by performing exercises previously at any tension. When two contractions at 40 percent MVC were performed with an interval of 10 mins between them, the duration of the second contraction was always about 80 percent of that of the first. However, if a contraction of 10 percent MVC was maintained during the 10 min interval between the two fatiguing contractions at 40 percent MVC, the duration of the second contraction was reduced to 28 percent of the first.
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:
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 1840
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Book Description
Author: Jürgen Gießing
Publisher: Cuvillier Verlag
ISBN: 3865375685
Category : Bodybuilding
Languages : en
Pages : 229
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Book Description
Author: Dr.Hande Turker
Publisher: BoD – Books on Demand
ISBN: 9535111183
Category : Medical
Languages : en
Pages : 326
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Book Description
Utilization of electrodiagnosis; namely electromyography (EMG), nerve conduction studies, late responses, repetitive nerve stimulation techniques, quantitative EMG and evoked potentials, has long been discussed in many text books as basic principles. However the usage of electroneuromyography is rather new in some aspects when compared with tasks of daily practise. This book, we believe, will cover and enlighten those aspects where electrodiagnosis has begun to play important roles nowadays.
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:
Publisher:
ISBN:
Category : Exercise
Languages : en
Pages : 386
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Book Description
Consists of citations selected from those contained in the National Library of Medicine's Medical Literature Analysis and Retrieval System.
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.
