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Neuromuscular fatigue

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https://www.readbyqxmd.com/read/28219032/analysis-of-the-semg-force-relationship-using-hd-semg-technique-and-data-fusion-a-simulation-study
#1
Mariam Al Harrach, Vincent Carriou, Sofiane Boudaoud, Jeremy Laforet, Frederic Marin
The relationship between the surface Electromyogram (sEMG) signal and the force of an individual muscle is still ambiguous due to the complexity of experimental evaluation. However, understanding this relationship should be useful for the assessment of neuromuscular system in healthy and pathological contexts. In this study, we present a global investigation of the factors governing the shape of this relationship. Accordingly, we conducted a focused sensitivity analysis of the sEMG/force relationship form with respect to neural, functional and physiological parameters variation...
February 16, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28215399/restoring-standing-capabilities-with-feedback-control-of-functional-neuromuscular-stimulation-following-spinal-cord-injury
#2
REVIEW
Raviraj Nataraj, Musa L Audu, Ronald J Triolo
This paper reviews the field of feedback control for neuroprosthesis systems that restore advanced standing function to individuals with spinal cord injury. Investigations into closed-loop control of standing by functional neuromuscular stimulation (FNS) have spanned three decades. The ultimate goal for FNS standing control systems is to facilitate hands free standing and enabling the user to perform manual functions at self-selected leaning positions. However, most clinical systems for home usage currently only provide basic upright standing using preprogrammed stimulation patterns...
February 15, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28212264/correlated-emg-oscillations-between-antagonists-during-cocontraction-in-men
#3
Yasuhide Yoshitake, Hiroaki Kanehisa, Minoru Shinohara
PURPOSE: The purpose of this study was to determine the modulation of common low-frequency oscillations in pools of motor units across antagonistic muscles because of the difference in the activation level of pools of spinal motor neurons and the presence of neuromuscular fatigue during intended cocontraction. METHODS: Ten healthy young men (21.8 ± 1.5 yr) performed intended steady cocontractions of elbow flexors and extensors at maximal and a submaximal (10% of maximal EMG) effort...
March 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28209743/skeletal-muscle-bioenergetics-during-all-out-exercise-mechanistic-insight-into-the-oxygen-uptake-slow-component-and-neuromuscular-fatigue
#4
Ryan M Broxterman, Gwenael Layec, Thomas J Hureau, Markus Amann, Russell S Richardson
Although commonly used, the physiological mechanisms underlying all-out exercise performance are still unclear and an in-depth assessment of skeletal muscle bioenergetics is lacking. Therefore, phosphorous magnetic resonance spectroscopy ((31)P-MRS) was utilized to assess skeletal muscle bioenergetics during a 5-min all-out intermittent isometric knee-extensor protocol in 8 healthy men. The metabolic perturbation, adenosine triphosphate (ATP) synthesis rates, ATP cost of contraction, and mitochondrial capacity were determined from intramuscular concentrations of phosphocreatine (PCr), inorganic phosphate (Pi), diprotonated phosphate (H2PO4⁻ ), and pH...
February 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28207951/endurance-capacity-and-neuromuscular-fatigue-following-high-vs-moderate-intensity-endurance-training-a-randomised-trial
#5
Thomas J O'Leary, Johnny Collett, Ken Howells, Martyn G Morris
High-intensity exercise induces significant central and peripheral fatigue, however the effect of endurance training on these mechanisms of fatigue is poorly understood. We compared the effect of cycling endurance training of disparate intensities on high-intensity exercise endurance capacity and the associated limiting central and peripheral fatigue mechanisms. Twenty adults were randomly assigned to 6 weeks of either high-intensity interval training (HIIT, 6-8 × 5 min at halfway between lactate threshold and maximal oxygen uptake [50%Δ]) or volume matched moderate-intensity continuous training (CONT, ~60-80 min at 90% lactate threshold)...
February 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28204862/effect-of-constant-predictable-and-unpredictable-motor-tasks-on-motor-performance-and-blood-markers-of-stress
#6
Laura Kyguoliene, Albertas Skurvydas, Nerijus Eimantas, Neringa Baranauskienė, Dalia Mickeviciene, Daiva Urboniene, Margarita Cernych, Marius Brazaitis
An unfamiliar or novel physical stimulus induces activation of dopaminergic neurons within the brain and greater activity in areas involved in emotion; considering this, we aimed to establish whether unpredictable prolonged (fatiguing) motor task (vs. constant vs. predictable) evokes greater dopaminergic activity, enhances neuromuscular performance, motor accuracy, and perception of effort, and delays overall central fatigue. Fifteen healthy male volunteers (aged 22 ± 4 years) were required to perform 1 of 3 exercise trials (at least 1 week apart) of 100 intermittent isometric contraction (IIC) tasks involving knee extensions at 60° flexion...
February 16, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28195978/lack-of-influence-of-muscular-performance-parameters-on-spatio-temporal-adaptations-with-increased-running-velocity
#7
Luis E Roche-Seruendo, Felipe García-Pinillos, Joana Haicaguerre, Ana V Bataller-Cervero, Víctor M Soto-Hermoso, Pedro Á Latorre-Román
This study aimed to analyse the influence of muscular performance parameters on spatio-temporal gait characteristics during running when gradually increasing speed. 51 recreationally trained male endurance runners (age: 28 ± 8 years) voluntarily participated in this study. Subjects performed a battery of jumping tests (squat jump, countermovement jump, and 20 cm drop jump), and after that, the subjects performed an incremental running test (10 to 20 km/h) on a motorized treadmill. Spatio-temporal parameters were measured using the OptoGait system...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28177692/neuromuscular-manifestations-of-work-related-myalgia-in-women-specific-to-extensor-carpi-radialis-brevis
#8
Howard J Green, Don Ranney, Natasha Kyle, David Lounsbury, Ian C Smith, Riley Stewart, Melissa M Thomas, Heather Tick, A Russell Tupling
This study assessed neuromuscular function in the extensor carpi radialis brevis (ECRB) of female workers diagnosed with work-related myalgia (WRM, n=14, age 45.2±1.9 years) and the ECRB of healthy controls (CON, n=10, age 34.6±2.5 years). Groups were compared on voluntary and electrically evoked functional responses at rest (Pre), immediately following a 5 min repetitive task (Post-0) performed at 60% maximal voluntary contraction (MVC), and after 5 min of recovery (Post-5). Despite near complete motor unit activation (MUA)(CON 98±1% vs WRM 99±1%), at Pre, WRM produced 26% less (P<0...
November 24, 2016: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28166186/between-session-reliability-of-isometric-mid-thigh-pull-kinetics-and-maximal-power-clean-performance-in-male-youth-soccer-players
#9
Thomas Dos'Santos, Christopher Thomas, Paul Comfort, John J McMahon, Paul A Jones, Nick P Oakley, Ashley L Young
The aim of the study was to determine the between-session reliability of isometric mid-thigh pull (IMTP) kinetics and maximal weight lifted during the power clean (PC) in male youth soccer players, and to identify the smallest detectable differences between sessions. Thirteen male youth soccer players (age: 16.7 ± 0.5 years, height: 1.80 ± 0.08 m, mass: 70.5 ± 9.4 kg) performed three IMTP trials, while only ten soccer players performed maximal power cleans. These were performed twice, separated by 48 hours to examine the between-session reliability...
February 1, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28160084/neuromuscular-adaptations-to-sprint-interval-training-and-the-effect-of-mammalian-omega-3-fatty-acid-supplementation
#10
Evan J H Lewis, Frédéric Stucky, Peter W Radonic, Adam H Metherel, Thomas M S Wolever, Greg D Wells
PURPOSE: Sprint interval training (SIT) stimulates rapid metabolic adaptations within skeletal muscle but the nature of neuromuscular adaptions is unknown. Omega-3 polyunsaturated fatty acids (N-3 PUFA) are suggested to enhance neuromuscular adaptations to exercise. METHODS: We measured the neuromuscular adaptations to SIT (Study-1) and conducted a placebo-controlled randomized double blinded study to determine the effect of N-3 PUFA supplementation on neuromuscular adaptations to SIT (Study-2)...
February 3, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28150163/fatigue-and-recovery-in-rugby-a-review
#11
REVIEW
Francisco Tavares, Tiaki Brett Smith, Matthew Driller
The physical demands and combative nature of rugby lead to notable levels of muscle damage. In professional rugby, athletes only have a limited timeframe to recover following training sessions and competition. Through the implementation of recovery strategies, sport scientists, practitioners and coaches have sought to reduce the effect of fatigue and allow athletes to recover faster. Although some studies demonstrate that recovery strategies are extensively used by rugby athletes, the research remains equivocal concerning the efficacy of recovery strategies in rugby...
February 2, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28130080/fatigability-in-patients-with-multiple-sclerosis-during-maximal-concentric-contractions
#12
Sophie Hameau, Djamel Bensmail, Nicolas Roche, Raphael Zory
OBJECTIVE: To compare quadriceps fatigability during maximal concentric contractions in persons with MS and healthy subjects (HS). DESIGN: Observational study. SETTING: Hospital rehabilitation department PARTICIPANTS: Thirty eight persons with MS and fourteen HS were included. Torque of the knee flexor and extensor muscles and fatigability of the knee extensor muscles were evaluated using an isokinetic device. Surface electromyographic activity of rectus femoris, vastus lateralis, biceps femoris, and semi tendinosus was recorded...
January 24, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28129235/short-term-neuromuscular-electrical-stimulation-training-of-the-tibialis-anterior-did-not-improve-strength-and-motor-function-in-facioscapulohumeral-muscular-dystrophy-patients
#13
Aude-Clémence M Doix, Karin Roeleveld, Jérémy Garcia, Pauline Lahaut, Véronique Tanant, Manuella Fournier-Mehouas, Claude Desnuelle, Serge S Colson, Sabrina Sacconi
OBJECTIVE: The aim of this study was to investigate the effects on motor function, muscle strength, and endurance of short-term neuromuscular electrical stimulation training of the tibialis anterior muscles in patients with facioscapulohumeral muscular dystrophy type 1 (FSHD1) in comparison with healthy controls. DESIGN: This prospective study included 10 patients with FSHD1 and 10 healthy participants. Maximal voluntary isometric contraction of ankle dorsiflexion and a 2-min sustained dorsiflexion maximal voluntary contraction with surface electromyography recordings of the tibialis anterior and the soleus muscles were measured and motor function clinical tests were performed before and after the training period...
January 26, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28095070/player-responses-to-match-and-training-demands-during-an-intensified-fixture-schedule-in-professional-rugby-league-a-case-study
#14
Craig Twist, Jamie Highton, Matthew Daniels, Nathan Mill, Graeme Close
Player loads and fatigue responses were reported in 15 professional rugby league players (24.3 ± 3.8 y) during a period of intensified fixtures. Repeated measures of internal and external loads, perceived wellbeing and jump flight time were recorded across 22 days, comprising nine training sessions and matches on days 5, 12, 15 and 21 (player exposure: 3.6 ± 0.6 matches). Mean training load (session RPE x duration) between matches was 1177, 1083, 103, and 650 AU, respectively. Relative distance in Match 1 (82 m/min) and Match 4 (79 m/min) was very likely lower in Match 2 (76 m/min) and likely higher in Match 3 (86 m/min)...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28078451/slower-but-not-faster-unilateral-fatiguing-knee-extensions-alter-contralateral-limb-performance-without-impairment-of-maximal-torque-output
#15
Olaf Prieske, Saied J Aboodarda, José A Benitez Sierra, David G Behm, Urs Granacher
PURPOSE: The purpose of the present study was to examine the effects of unilateral fatigue of the knee extensors at different movement velocities on neuromuscular performance in the fatigued and non-fatigued leg. METHODS: Unilateral fatigue of the knee extensors was induced in 11 healthy young men (23.7 ± 3.8 years) at slower (60°/s; FAT60) and faster movement velocities (240°/s; FAT240) using an isokinetic dynamometer. A resting control (CON) condition was included...
January 11, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28067943/gamma-aminobutyric-acid-gaba-modulators-for-amyotrophic-lateral-sclerosis-motor-neuron-disease
#16
REVIEW
Andrea Diana, Rita Pillai, Paolo Bongioanni, Aidan G O'Keeffe, Robert G Miller, Dan H Moore
BACKGROUND: Imbalance of gamma aminobutyric acid (GABA) and related modulators has been implicated as an important factor in the pathogenesis of amyotrophic lateral sclerosis (ALS), which is also known as motor neuron disease (MND). In this context, the role and mechanism of action of gabapentin and baclofen have been extensively investigated, although with conflicting results. This is the first systematic review to assess clinical trials of GABA modulators for the treatment of ALS. OBJECTIVES: To examine the efficacy of gabapentin, baclofen, or other GABA modulators in delaying the progression of ALS, and to evaluate adverse effects of these interventions...
January 9, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28064025/plantar-flexor-muscle-weakness-and-fatigue-in-spastic-cerebral-palsy-patients
#17
Daria Neyroud, Stéphane Armand, Geraldo De Coulon, Sarah R Dias Da Silva, Nicola A Maffiuletti, Bengt Kayser, Nicolas Place
BACKGROUND: Patients with cerebral palsy develop an important muscle weakness which might affect the aetiology and extent of exercise-induced neuromuscular fatigue. AIM: This study evaluated the aetiology and extent of plantar flexor neuromuscular fatigue in patients with cerebral palsy. METHODS: Ten patients with cerebral palsy and 10 age- and sex-matched healthy individuals (∼20 years old, 6 females) performed four 30-s maximal isometric plantar flexions interspaced by a resting period of 2-3s to elicit a resting twitch...
January 5, 2017: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/28060035/etiology-and-recovery-of-neuromuscular-fatigue-following-simulated-soccer-match-play
#18
Kevin Thomas, Jack Dent, Glyn Howatson, Stuart Goodall
PURPOSE: We profiled the etiology and recovery of neuromuscular fatigue post-simulated-soccer-match-play. METHODS: Fifteen semi-professional players completed a 90 min simulated soccer match. Pre-, immediately-post and at 24, 48 and 72 h participants completed a battery of neuromuscular, physical and perceptual tests. Perceived fatigue and muscle soreness were assessed via visual analogue scales. Maximum voluntary contraction (MVC) and twitch responses to electrical (femoral nerve) and magnetic (motor cortex) stimulation during isometric knee-extensor contractions and at rest were measured to assess central (voluntary activation, VA) and peripheral (quadriceps potentiated twitch force, Qtw,pot) fatigue, and responses to single and paired-magnetic stimuli were assessed to quantify corticospinal excitability and short-intracortical inhibition (SICI), respectively...
January 3, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28045063/profile-of-upregulated-inflammatory-proteins-in-sera-of-myasthenia-gravis-patients
#19
Carl Johan Molin, Elisabet Westerberg, Anna Rostedt Punga
This study describes specific patterns of elevated inflammatory proteins in clinical subtypes of myasthenia gravis (MG) patients. MG is a chronic, autoimmune neuromuscular disease with antibodies most commonly targeting the acetylcholine receptors (AChRab), which causes fluctuating skeletal muscle fatigue. MG pathophysiology includes a strong component of inflammation, and a large proportion of patients with early onset MG additionally present thymus hyperplasia. Due to the fluctuating nature and heterogeneity of the disease, there is a great need for objective biomarkers as well as novel potential inflammatory targets...
January 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28008101/muscle-metabolic-and-neuromuscular-determinants-of-fatigue-during-cycling-in-different-exercise-intensity-domains
#20
Matthew I Black, Andrew M Jones, Jamie R Blackwell, Stephen J Bailey, Lee J Wylie, Sinead T J McDonagh, Christopher Thompson, James Kelly, Paul Sumners, Katya J Mileva, Joanna L Bowtell, Anni Vanhatalo
The lactate or gas exchange threshold (GET) and the critical power (CP) are closely associated with human exercise performance. We tested the hypothesis that the limit of tolerance (Tlim) during cycle exercise performed within the exercise intensity domains demarcated by GET and CP is linked to discrete muscle metabolic and neuromuscular responses. Eleven males performed a ramp incremental exercise test, 4-5 severe-intensity (SEV; >CP) constant-work-rate (CWR) tests until Tlim, a heavy-intensity (HVY; <CP but >GET) CWR test until Tlim, and a moderate-intensity (MOD; <GET) CWR test until Tlim Muscle biopsies revealed that a similar (P>0...
December 22, 2016: Journal of Applied Physiology
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