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Neuromuscular fatigue

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https://www.readbyqxmd.com/read/28813798/a-novel-method-for-muscle-fatigue-assessment-during-robot-based-tracking-tasks
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
https://www.readbyqxmd.com/read/28737588/longer-concentric-action-increases-muscle-activation-and-neuromuscular-fatigue-responses-in-protocols-equalized-by-repetition-duration
#7
Lucas T Lacerda, Cinara G Costa, Fernando V Lima, Hugo C Martins-Costa, Rodrigo C R Diniz, André G P Andrade, Gustavo H C Peixoto, Michael G Bemben, Mauro H Chagas
The aim of this study was to investigate the impact of protocols equalized by the repetition duration but composed of different concentric and eccentric durations on muscle activation and neuromuscular fatigue. Seventeen males with previous experience in resistance training performed 3 training protocols (A - 2s con : 4s ecc; B - 3s con : 3s ecc; and C - 4s con : 2s ecc) with the Smith machine bench press exercise, all with 3 sets, 6 repetitions, 3 minutes' rest, and 60% of 1RM. The normalized root mean square of the electromyographic signal (EMGRMS) and mean frequency electromyography (EMGMF) for pectoralis major and triceps brachii muscles were calculated for 2nd and 5th repetitions in each set...
July 19, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28732481/central-and-peripheral-fatigue-development-in-the-shoulder-muscle-with-obesity-during-an-isometric-endurance-task
#8
Mojdeh Pajoutan, Mahboobeh Ghesmaty Sangachin, Lora A Cavuoto
BACKGROUND: Fatigue increases the likelihood of developing work-related musculoskeletal disorders and injury. Due to the physiological and neuromuscular changes that accompany obesity, it may alter the fatigue development mechanism and exacerbate injury risk. The upper extremities have the highest incidence rates for work-related musculoskeletal disorders. Therefore, the goals of this study were to investigate the effect of obesity on central vs. peripheral fatigue as well as on the physical signs of fatigue on the middle deltoid muscle...
July 21, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28723717/localized-muscle-vibration-reverses-quadriceps-muscle-hypotrophy-and-improves-physical-function-a-clinical-and-electrophysiological-study
#9
Maria Grazia Benedetti, Gennaro Boccia, Lorenzo Cavazzuti, Elena Magnani, Elisabetta Mariani, Alberto Rainoldi, Roberto Casale
Quadriceps weakness has been associated with knee osteoarthritis (OA). High-frequency localized muscle vibration (LMV) has been proposed recently for quadriceps strengthening in patients with knee OA. The purpose of this study was (a) to investigate the clinical effectiveness of high-frequency LMV on quadriceps muscle in patients with knee OA and (b) to disentangle, by means of surface electromyography (sEMG), the underlying mechanism. Thirty patients, aged between 40 and 65 years, and clinically diagnosed with knee OA were included in this randomized, controlled, single-blinded pilot study...
July 18, 2017: International Journal of Rehabilitation Research. Revue Internationale de Recherches de Réadaptation
https://www.readbyqxmd.com/read/28721747/faster-v%C3%AC-o2-kinetics-after-priming-exercises-of-different-duration-but-same-fatigue
#10
Felipe Mattioni Maturana, Arthur Peyrard, John Temesi, Guillaume Y Millet, Juan M Murias
This study compared the responses of two priming exercises of similar fatigue on the adjustment of the oxygen uptake time constant (τV̇O2) in cycling. Ten healthy young adults (25 ± 3 yr) performed: three step transitions from a 20-W baseline to the power output (PO) below the gas exchange threshold (MOD, MODPRE); a 3-min bout (P3MIN) at 90% of peak PO (POpeak), followed by MOD (MOD3MIN); and a 6-min bout (P6MIN) at 80% of POpeak, followed by MOD (MOD6MIN). The O2 supply-to-O2 demand ([HHb]/V̇O2) ratio was calculated for MODPRE, MOD3MIN, and MOD6MIN...
July 19, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28708702/exercise-induced-fatigue-in-severe-hypoxia-following-an-intermittent-hypoxic-protocol
#11
Rosie Twomey, James Wrightson, Hannah Fletcher, Stephanie Avraam, Emma Ross, Jeanne Dekerle
PURPOSE: Exercise-induced central fatigue is alleviated following acclimatisation to high altitude. The adaptations underpinning this effect may also be induced with brief, repeated exposures to severe hypoxia. The purpose of this study was to determine whether (i) exercise tolerance in severe hypoxia would be improved following an intermittent hypoxic (IH) protocol and (ii) exercise-induced central fatigue would be alleviated following an IH protocol. METHODS: Nineteen recreationally-active males were randomised into two groups who completed ten 2-h exposures in severe hypoxia (IH: PIO2 82 mmHg; n=11) or normoxia (control; n=8)...
July 13, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28704311/acute-neuromuscular-and-endocrine-responses-to-two-different-compound-exercises-squat-versus-deadlift
#12
Matthew J Barnes, Adam Miller, Daniel Reeve, Robin Jc Stewart
Anecdotally, it is believed that the deadlift exercise brings about greater levels of central fatigue than other exercises; however no empirical evidence exists to support this view. Additionally, little is known about the acute endocrine response to heavy deadlift exercise and how this may differ to other similar compound exercises. Therefore, the aim of this study was to identify and compare the acute, neuromuscular and endocrine responses to squat and deadlift exercise. Ten resistance trained males completed 8 sets of 2 repetitions at 95 % of one repetition maximum...
July 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28700511/quantifying-changes-in-squat-jump-height-across-a-season-of-men-s-collegiate-soccer
#13
Matt L Sams, Kimitake Sato, Brad H DeWeese, Adam L Sayers, Michael H Stone
The purposes of this study were to examine the effectiveness of an athlete monitoring program in managing athlete neuromuscular fatigue across a men's collegiate soccer season as measured by changes in squat jump (SJ) height and to compare possible changes with session rating of perceived exertion (sRPE) training load (TL). Eighteen outfield Division I men's college soccer players performed SJ testing prior to each game of the fall season in addition to a baseline measurement at the start of pre-season. The athletes provided sRPE values after all training sessions, weight training, and games...
July 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28698474/a-novel-spatial-feature-for-the-identification-of-motor-tasks-using-high-density-electromyography
#14
Mislav Jordanić, Mónica Rojas-Martínez, Miguel Angel Mañanas, Joan Francesc Alonso, Hamid Reza Marateb
Estimation of neuromuscular intention using electromyography (EMG) and pattern recognition is still an open problem. One of the reasons is that the pattern-recognition approach is greatly influenced by temporal changes in electromyograms caused by the variations in the conductivity of the skin and/or electrodes, or physiological changes such as muscle fatigue. This paper proposes novel features for task identification extracted from the high-density electromyographic signal (HD-EMG) by applying the mean shift channel selection algorithm evaluated using a simple and fast classifier-linear discriminant analysis...
July 8, 2017: Sensors
https://www.readbyqxmd.com/read/28674602/the-effects-of-work-to-rest-ratios-on-torque-electromyographic-and-mechanomyographic-responses-to-fatiguing-workbouts
#15
Ethan C Hill, Terry J Housh, Cory M Smith, Kristen C Cochrane, Nathaniel D M Jenkins, Richard J Schmidt, Glen O Johnson
The purpose of the present study was to examine the effects of 2 different work-to-rest ratios, but the same mean load, cycle time, and total duration of the exercise bout, on maximal voluntary isometric contraction torque and neuromuscular responses to fatiguing, intermittent, submaximal, isometric, forearm flexion muscle actions. Ten men performed 2 fatiguing protocols with different work-to-rest ratios (4 s contraction, 4 s rest vs. 4 s contraction, alternating 6 and 2 s rest) that consisted of 50 intermittent, submaximal (65% of maximal voluntary isometric contraction), isometric, forearm flexion muscle actions...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28658030/fatigue-and-physical-fitness-of-mildly-disabled-persons-with-multiple-sclerosis-a-cross-sectional-study
#16
Maxime Valet, Thierry Lejeune, Yumiko Glibert, Jean C Hakizimana, Vincent Van Pesch, Souraya El Sankari, Christine Detrembleur, Gaëtan Stoquart
Fatigue is frequent and disabling in persons with multiple sclerosis (pwMS) with mild neurological disability. These patients also have impaired physical fitness. Whether mildly disabled pwMS are deconditioned, and this deconditioning is linked to fatigue, remains unknown. Our aim is to determine the physical fitness of mildly disabled patients with multiple sclerosis and study its relationship with perceived fatigue and to link perceived fatigue with other parameters. Twenty patients (14 women; mean age: 45...
June 27, 2017: International Journal of Rehabilitation Research. Revue Internationale de Recherches de Réadaptation
https://www.readbyqxmd.com/read/28656531/acl-injury-prevention-what-does-research-tell-us
#17
REVIEW
Trent Nessler, Linda Denney, Justin Sampley
PURPOSE OF REVIEW: Mechanisms leading to anterior cruciate ligament (ACL) injury have been identified, yet re-injury or a secondary injury persists in the athletic population. The purpose of this review is to identify risk factors associated with ACL injury and investigate programs to prevent injury. RECENT FINDINGS: Faulty mechanics during dynamic movement that cause excessive valgus force at the knee increases the risk of ACL injury. Faulty mechanics may be a result of lateral displacement of the trunk, unequal limb loading, and lack of control to avoid the valgus knee position...
June 27, 2017: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/28635482/diagnosis-and-management-of-myasthenia-gravis
#18
Christopher Barber
Myasthenia gravis is a rare long-term neurological condition that is characterised by fluctuating skeletal muscle weakness and fatigue, as well as respiratory difficulties. It is both an acquired autoimmune disease and a chronic neuromuscular disorder. Because of its rarity, myasthenia gravis is relatively unknown and may be unfamiliar to many nurses. While there are various types of myasthenia, this article focuses on myasthenia gravis, exploring its symptoms, diagnosis and treatment, and examining the nurse's role in managing the condition...
June 21, 2017: Nursing Standard
https://www.readbyqxmd.com/read/28634456/absolute-and-relative-training-load-and-its-relation-to-fatigue-in-football
#19
Unai Zurutuza, Julen Castellano, Ibon Echeazarra, David Casamichana
The aim of the study was to assess the relationship of external and internal training load (TL) indicators with the objective and subjective fatigue experienced by 15 semi-professional football players, over eight complete weeks of the competition period in the 2015-2016 season, which covered microcycles from 34th to 41st. The maximum heart rate (HRmax) and maximum speed (Vmax) of all the players were previously measured in specific tests. The TL was monitored via questionnaires on rating of perceived exertion (RPE), pulsometers and GPS devices, registering the variables: total distance (TD), player load 2D (PL2D), TD at >80% of the Vmax (TD80), TD in deceleration at < -2 m⋅sec-2 (TDD <-2), TD in acceleration >2 m⋅sec(-2) (TDA >2), Edwards (ED), time spent at between 50 and 80% (50-80% HRmax), 80-90% (80-90% HRmax), and >90% of the HRmax (>90% HRmax), and RPE both respiratory/thoracic (RPEres) and leg/muscular (RPEmus)...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28627356/aquatic-therapy-for-children-with-duchenne-muscular-dystrophy-a-pilot-feasibility-randomised-controlled-trial-and-mixed-methods-process-evaluation
#20
Daniel Hind, James Parkin, Victoria Whitworth, Saleema Rex, Tracey Young, Lisa Hampson, Jennie Sheehan, Chin Maguire, Hannah Cantrill, Elaine Scott, Heather Epps, Marion Main, Michelle Geary, Heather McMurchie, Lindsey Pallant, Daniel Woods, Jennifer Freeman, Ellen Lee, Michelle Eagle, Tracey Willis, Francesco Muntoni, Peter Baxter
BACKGROUND: Duchenne muscular dystrophy (DMD) is a rare disease that causes the progressive loss of motor abilities such as walking. Standard treatment includes physiotherapy. No trial has evaluated whether or not adding aquatic therapy (AT) to land-based therapy (LBT) exercises helps to keep muscles strong and children independent. OBJECTIVES: To assess the feasibility of recruiting boys with DMD to a randomised trial evaluating AT (primary objective) and to collect data from them; to assess how, and how well, the intervention and trial procedures work...
May 2017: Health Technology Assessment: HTA
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