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Neuromuscular fatigue

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https://www.readbyqxmd.com/read/28933712/volume-load-and-neuromuscular-fatigue-during-an-acute-bout-of-agonist-antagonist-paired-set-vs-traditional-set-training
#1
Gabriel A Paz, Daniel W Robbins, Carlos G de Oliveira, Martim Bottaro, Humberto Miranda
Paz, GA, Robbins, DW, de Oliveira, CG, Bottaro, M, and Miranda, H. Volume load and neuromuscular fatigue during an acute bout of agonist-antagonist paired-set vs. traditional-set training. J Strength Cond Res 31(10): 2777-2784, 2017-The purpose of this study was to investigate the acute effects of performing paired-set (PS) vs. traditional-set (TS) training over 3 consecutive sets, on volume load and electromyographic fatigue parameters of the latissimus dorsi, biceps brachii, pectoralis major, and triceps brachii muscles...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28930862/an-innovative-ergometer-to-measure-neuromuscular-fatigue-immediately-after-cycling
#2
Douglas Doyle-Baker, John Temesi, Mary E Medysky, Robert J Holash, Guillaume Y Millet
PURPOSE: When assessing neuromuscular fatigue (NMF) from dynamic exercise using large muscle mass (e.g. cycling), most studies have delayed measurement for 1-3 min after task failure. This study aimed to determine the reliability of an innovative cycling ergometer permitting the start of fatigue measurement within 1 s after cycling. METHODS: Twelve subjects participated in two experimental sessions. Knee-extensor NMF was assessed by electrical nerve and transcranial magnetic stimulation with both a traditional chair set-up (PRE and POST-Chair, 2 min post-exercise) and the new cycling ergometer (PRE, every 3 min during incremental exercise and POST-Bike, at task failure)...
September 19, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28902119/determination-of-vertical-jump-as-a-measure-of-neuromuscular-readiness-and-fatigue
#3
Casey M Watkins, Saldiam R Barillas, Megan A Wong, David C Archer, Ian J Dobbs, Robert G Lockie, Jared W Coburn, Tai T Tran, Lee E Brown
Coaches closely monitor training loads and periodize sessions throughout the season to create optimal adaptations at the proper time. However, only monitoring training loads ignores the innate physiological stress each athlete feels individually. Vertical jump (VJ) is widely used as a measure of lower body power, and has been used in post-match studies to demonstrate fatigue levels. However, no pre-training monitoring via VJ performance has been previously studied. Therefore, the purpose of this study was to determine the sensitivity of VJ as a measure of readiness and fatigue on a daily sessional basis...
September 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28902108/effects-of-two-different-self-adapted-occlusal-splints-on-electromyographic-and-force-parameters-during-elbow-flexors-isometric-contraction
#4
Eloisa Limonta, Chiara Arienti, Susanna Rampichini, Massimo Venturelli, Emiliano Cè, Arsenio Veicsteinas, Fabio Esposito
The study was aimed at determining the acute effects of two types of occlusal splints on maximum isometric strength and fatigue of the elbow flexors muscles. The hypothesis was that splint-induced masticatory muscle repositioning might improve primary muscles recruitment by stretching masticatory muscles especially with the thicker splint.On nine physically active volunteers with no temporo-mandibular joint and masticatory muscles disorders, we assessed maximum voluntary contraction (MVC) of the elbow flexors with diurnal (OSD, 1-mm thick) and sport (OSSP, 3-mm thick) splints, and without splint (control, Ctrl)...
September 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28900719/the-effects-of-exercise-induced-muscle-damage-on-critical-torque
#5
Marcin K Szczyglowski, Carl J Ade, Jason A Campbell, Christopher D Black
OBJECTIVE: Exercise-induced muscle damage (EIMD) has been shown to reduce endurance exercise performance. This study examined the effects of EIMD on critical torque (CT) and the sum of the torque integral above CT during (∫ T total) during a 5-min all-out, intermittent isometric knee extension exercise. METHODS: CT was determined in eight participants prior to and 48-h following EIMD. EIMD was induced using electrically stimulated eccentric knee extensions until maximal voluntary strength (MVC) was reduced by 40%...
September 12, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28889846/acupuncture-for-management-of-type-2-diabetes-mellitus-in-a-patient-with-myasthenia-gravis-a-case-report
#6
Yun Jin Kim
Myasthenia gravis (MG) is an acquired disease of the neuromuscular junctions characterized by muscular weakness and fatigue, with a prevalence of 50-125 cases per million population in western countries. In men, it usually appears after the age of 60 years, while in women, it usually appears before the age of 40 years. Long-term immunosuppression with corticosteroids is the mainstay treatment for patients with MG; however, the use of corticosteroids is a well-documented risk factor for type 2 diabetes mellitus, which has also been reported in steroid-treated patients with MG...
August 2017: Journal of Acupuncture and Meridian Studies
https://www.readbyqxmd.com/read/28880935/post-fatigue-recovery-of-power-postural-control-and-physical-function-in-older-women
#7
Stephen A Foulis, Stephanie L Jones, Richard E van Emmerik, Jane A Kent
Low muscle power, particularly at high velocities, has been linked to poor physical function in older adults. Any loss in muscle power following fatiguing exercise or daily activities could impact physical function and postural control until power has fully recovered. To test the overall hypothesis that a common task such as walking can result in prolonged power loss and decreased physical function and balance, 17 healthy older (66-81 years) women completed a 32-min walking test (32MWT) designed to induce neuromuscular fatigue, followed by 60min of recovery (60R)...
2017: PloS One
https://www.readbyqxmd.com/read/28879576/effects-of-acute-resistance-training-modality-on-corticospinal-excitability-intra-cortical-and-neuromuscular-responses
#8
Christopher Latella, Wei-Peng Teo, Dale Harris, Brendan Major, Dan VanderWesthuizen, Ashlee M Hendy
OBJECTIVE: Although neural adaptations from strength training are known to occur, the acute responses associated with heavy-strength (HST) and hypertrophy training (HYT) remain unclear. Therefore, we aimed to compare the acute behaviour of corticospinal responses following a single session of HST vs HYT over a 72-h period. METHODS: Fourteen participants completed a random counterbalanced, crossover study that consisted of a single HST session [5 sets × 3 repetition maximum (RM)], a HYT session (3 sets × 12 RM) of the leg extensors and a control session (CON)...
September 6, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28872370/neuromuscular-responses-to-conditioned-soccer-sessions-assessed-via-gps-embedded-accelerometers-insights-into-tactical-periodization
#9
Martin Buchheit, Mathieu Lacome, Yannick Cholley, Ben M Simpson
PURPOSE: To 1) examine the reliability of field-based running-specific measures of neuromuscular function assessed via GPS-embedded accelerometers and 2) examine their responses to three typical conditioned sessions (i.e., Strength, Endurance and Speed) in elite soccer players. METHODS: Before and immediately after each session, vertical jump (CMJ) and adductors squeeze strength (Groin) performances were recorded. Players also performed a 4-min run at 12 km/h followed by 4 ~60-m runs (run =12 s, r =33 s)...
September 5, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28862761/effects-of-pulse-duration-on-muscle-fatigue-during-electrical-stimulation-inducing-moderate-level-contraction
#10
Woohyoung Jeon, Lisa Griffin
INTRODUCTION: Neuromuscular electrical stimulation (NMES) is used to prevent muscle atrophy. However, the effect of pulse duration modulation for reducing muscle fatigue and pain is unknown. METHODS: Two 2-minute stimulation protocols were applied to the knee extensors of 10 healthy individuals. In one session, a long pulse duration (1,000 μs) and a low current amplitude (LL) set to evoke 25% maximal voluntary contraction at 30 Hz were applied. The other session was identical except that a short pulse duration (200 μs) and a high current amplitude (SH) were used...
September 1, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28834910/application-of-different-ventilator-modes-in-patients-with-amyotrophic-lateral-sclerosis-according-to-certain-clinical-situations-a-case-report
#11
Donghwi Park
RATIONALE: Amyotrophic lateral sclerosis (ALS) is a rapidly progressing neurodegenerative disease that involves limb, axial, bulbar, and respiratory muscles. Fatigue and weakness of the respiratory muscles eventually induce respiratory insufficiency, which is one of the main causes of death in patients with ALS. In ALS patients with respiratory insufficiency, application of a ventilator is indispensable. Although there are various modes of ventilation, these modes are classified roughly into volume-controlled ventilation (VCV) and pressure-controlled ventilation (PCV)...
August 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28830284/generation-of-synthetic-surface-electromyography-signals-under-fatigue-conditions-for-varying-force-inputs-using-feedback-control-algorithm
#12
G Venugopal, P Deepak, Diptasree M Ghosh, S Ramakrishnan
Surface electromyography is a non-invasive technique used for recording the electrical activity of neuromuscular systems. These signals are random, complex and multi-component. There are several techniques to extract information about the force exerted by muscles during any activity. This work attempts to generate surface electromyography signals for various magnitudes of force under isometric non-fatigue and fatigue conditions using a feedback model. The model is based on existing current distribution, volume conductor relations, the feedback control algorithm for rate coding and generation of firing pattern...
August 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28821658/opposite-synaptic-alterations-at-the-neuromuscular-junction-in-an-als-mouse-model-when-motor-units-matter
#13
Tremblay Elsa, Martineau Éric, Robitaille Richard
Denervation of the neuromuscular junction (NMJ) precedes the loss of motor neurons (MNs) in amyotrophic lateral sclerosis (ALS). ALS is characterized by a motor unit (MU) dependent vulnerability where MNs with fast-fatigable (FF) characteristics are lost first, followed by fast-fatigue resistant (FR) and slow (S) ones. However, changes of NMJ properties as a function of MU types remain debated. We hypothesized that NMJ synaptic functions would be altered precociously in a MU specific manner, prior to structural alterations of the NMJ...
August 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28820857/kinematic-and-neuromuscular-measures-of-intensity-during-plyometric-jumps
#14
David Cristóbal Andrade, Oscar Manzo, Ana Rosa Beltrán, Cristian Álvarez, Rodrigo Del Rio, Camilo Toledo, Jason Moran, Rodrigo Ramirez-Campillo
The aim of this study was to assess jumping performance and neuromuscular activity in lower limb muscles after drop jumps (DJ) from different drop heights (intensity) and during continuous jumping (fatigue), using markers such as reactive strength, jump height, mechanical power and surface electromyography (sEMG). The eccentric (EC) and concentric (CON) sEMG from the medial gastrocnemius (MG), biceps femoris (BF) and rectus (R) muscles were assessed during all tests. In a cross-sectional, randomized study, eleven volleyball players (age 24...
August 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28813798/a-novel-method-for-muscle-fatigue-assessment-during-robot-based-tracking-tasks
#15
Maddalena Mugnosso, Francesca Marini, Matteo Gillardo, Pietro Morasso, Jacopo Zenzeri
In this work we propose a novel method based on sEMG signals, easy and fast to perform, administered with a robotic device to maximize repeatability and objectivity. Muscle fatigue, which is frequently experienced by healthy subjects, can be a highly debilitating symptom in case of neuromuscular disorders. Its assessment provides crucial information on the progression of the disability itself, on patient's muscular function and on the efficacy of the eventual clinical intervention. Hence, a robust and objective protocol for fatigue assessment is fundamental in rehabilitation practice...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28809841/measuring-neuromuscular-junction-functionality
#16
Emanuele Rizzuto, Simona Pisu, Carmine Nicoletti, Zaccaria Del Prete, Antonio Musarò
Neuromuscular junction (NMJ) functionality plays a pivotal role when studying diseases in which the communication between motor neuron and muscle is impaired, such as aging and amyotrophic lateral sclerosis (ALS). Here we describe an experimental protocol that can be used to measure NMJ functionality by combining two types of electrical stimulation: direct muscle membrane stimulation and the stimulation through the nerve. The comparison of the muscle response to these two different stimulations can help to define, at the functional level, potential alterations in the NMJ that lead to functional decline in muscle...
August 6, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28803817/6mwt-can-identify-type-3-sma-patients-with-neuromuscular-junction-dysfunction
#17
REVIEW
Maria Carmela Pera, Marco Luigetti, Marika Pane, Giorgia Coratti, Nicola Forcina, Lavinia Fanelli, Elena S Mazzone, Laura Antonaci, Leonardo Lapenta, Concetta Palermo, Domiziana Ranalli, Giuseppe Granata, Mauro Lomonaco, Serenella Servidei, Eugenio Mercuri
The aim of the study was to establish if the decrease in gait velocity on the 6 minute walk test relates to signs of neuromuscular junction dysfunction in spinal muscular atrophy type 3 patients. 6 minute walk test and low-rate repetitive nerve stimulation test were performed in fifteen ambulant patients with spinal muscular atrophy type 3 of age between 9 and 66 years. The 6 minute walk distance ranged between 66 and 575 m. The difference between the first and the 6th minute ranged between 0 and -69%. The low-rate repetitive nerve stimulation test measured in % of loss ranged between -31...
July 14, 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28762016/ica-based-muscle-tendon-units-localization-and-activation-analysis-during-dynamic-motion-tasks
#18
Xiang Chen, Shaoping Wang, Chengjun Huang, Shuai Cao, Xu Zhang
This study proposed an independent component analysis (ICA)-based framework for localization and activation level analysis of muscle-tendon units (MTUs) within skeletal muscles during dynamic motion. The gastrocnemius muscle and extensor digitorum communis were selected as target muscles. High-density electrode arrays were used to record surface electromyographic (sEMG) data of the targeted muscles during dynamic motion tasks. First, the ICA algorithm was used to decompose multi-channel sEMG data into a weight coefficient matrix and a source matrix...
July 18, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28743332/-clinical-significance-of-early-immunological-paralysis-in-patients-with-severe-h1n1-influenza-a
#19
Yongbing Qian, Hui Xie, Rui Tian, Jian Lu, Wei Jin, Ruilan Wang
OBJECTIVE: To analysis the immunological characteristics of patients with severe H1N1 influenza A, and to provide theoretical basis for predicting the prognosis of the disease. METHODS: A retrospective analysis was conducted. The clinical data of 15 patients diagnosed with severe H1N1 influenza A and admitted to Shanghai General Hospital of Nanjing Medical University from October 2015 to December 2016 were collected. All the patients were divided into survival and death groups according to 28-day survival...
July 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28742602/is-there-a-relationship-between-the-functional-movement-screen-star-excursion-balance-test-and-balance-error-scoring-system
#20
Nicole D Harshbarger, Barton E Anderson, Kenneth C Lam
OBJECTIVE: To evaluate associations between the Functional Movement Screen (FMS), Star Excursion Balance Test (SEBT), and Balance Error Scoring System (BESS) scores. DESIGN: Correlational. SETTING: College athletic training facilities. PARTICIPANTS: Fifty-two intercollegiate athletes (men = 36 and women = 16) representing 8 sports and cleared for unrestricted sport participation. INTERVENTIONS: Participants completed the FMS, SEBT, and BESS, in random order, during 1 testing session...
July 21, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
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