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Muscle fatigue

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https://www.readbyqxmd.com/read/28213765/association-between-signs-and-symptoms-of-bruxism-and-presence-of-tori-a-systematic-review
#1
Eduardo Bertazzo-Silveira, Juliana Stuginski-Barbosa, André Luís Porporatti, Bruce Dick, Carlos Flores-Mir, Daniele Manfredini, Graziela De Luca Canto
OBJECTIVE: This systematic review aims to answer the question: "Is there an association between any specific signs and symptoms of bruxism and the presence of tori?" MATERIAL AND METHODS: Observational studies, which evaluated the association between signs and symptoms of bruxism and tori, were selected. Signs and symptoms of bruxism (such as teeth grinding, jaw clenching, abnormal tooth wear, facial muscle hypertrophy, pain, or fatigue) had to be determined by questionnaire or anamnesis and tori within clinical assessment...
February 17, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28212264/correlated-emg-oscillations-between-antagonists-during-cocontraction-in-men
#2
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/28211794/test-retest-reliability-of-muscle-fiber-conduction-velocity-and-fractal-dimension-of-surface-emg-during-isometric-contractions
#3
Matteo Beretta-Piccoli, Giuseppe D'Antona, Cristian Zampella, Marco Barbero, Ron Clijsen, Corrado Cescon
The aim of this study was to determine the test-retest reliability of muscle fiber conduction velocity (CV) and fractal dimension (FD) obtained from multichannel surface electromyographic (sEMG) recordings. Forty healthy recreationally active subjects (20 men and 20 women) performed two elbow flexions on two trials with a 1-week interval. The first was a 20% maximal voluntary contraction (MVC) of 120 s, and the second at 60% MVC held until exhaustion. sEMG signals were detected from the biceps brachii, using bi-dimensional arrays...
February 17, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28210061/therapeutic-effects-of-massage-and-electrotherapy-on-muscle-tone-stiffness-and-muscle-contraction-following-gastrocnemius-muscle-fatigue
#4
Joong-San Wang
[Purpose] This study aimed to examine the effects of a combined intervention consisting of massage therapy and transcutaneous electrical nerve stimulation on gastrocnemius muscle fatigue, assessing whether the intervention improved muscle tone, stiffness, and muscle contraction. [Subjects and Methods] The subjects were 20 healthy males in their 20s who were equally divided into a transcutaneous electrical nerve stimulation group and a combined therapy group that received a combination of massage therapy and transcutaneous electrical nerve stimulation...
January 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28210056/the-effects-of-pre-exercise-vibration-stimulation-on-the-exercise-induced-muscle-damage
#5
Ji-Yun Kim, Da-Haeng Kang, Joon-Hee Lee, Se-Min O, Jae-Keun Jeon
[Purpose] To investigate the effects of pre-induced muscle damage vibration stimulation on the pressure-pain threshold and muscle-fatigue-related metabolites of exercise-induced muscle damage. [Subjects and Methods] Thirty healthy, adult male subjects were randomly assigned to the pre-induced muscle damage vibration stimulation group, post-induced muscle damage vibration stimulation group, or control group (n=10 per group). To investigate the effects of pre-induced muscle damage vibration stimulation, changes in the pressure-pain threshold (lb), creatine kinase level (U/L), and lactate dehydrogenase level (U/L) were measured and analyzed at baseline and at 24 hours, 48 hours, and 72 hours after exercise...
January 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28209743/skeletal-muscle-bioenergetics-during-all-out-exercise-mechanistic-insight-into-the-oxygen-uptake-slow-component-and-neuromuscular-fatigue
#6
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/28209439/post-polio-syndrome-cases-report-and-review-of-literature
#7
Żanna Pastuszak, Adam Stępień, Kazimierz Tomczykiewicz, Renata Piusińska-Macoch, Dariusz Galbarczyk, Agnieszka Rolewska
It is estimated that around 15 million people survived polio infection worldwide since early twentieth century. In 1950 effective vaccination was used for first time. Since that time number of affected people decreased. The last epidemic of Haine-Medine disease in Poland was in 1950s. Another rare cases of infections were observed till 1970s. About at least 15 years after polio virus infection, slowly progressive muscle limbs paresis with muscle atrophy, joints pain, paresthesia were observed in polio survivors...
February 3, 2017: Neurologia i Neurochirurgia Polska
https://www.readbyqxmd.com/read/28207951/endurance-capacity-and-neuromuscular-fatigue-following-high-vs-moderate-intensity-endurance-training-a-randomised-trial
#8
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/28207880/skeletal-muscle-metabolic-adaptations-to-endurance-exercise-training-are-attainable-in-mice-with-simvastatin-treatment
#9
William M Southern, Anna S Nichenko, Daniel D Shill, Corey C Spencer, Nathan T Jenkins, Kevin K McCully, Jarrod A Call
We tested the hypothesis that a 6-week regimen of simvastatin would attenuate skeletal muscle adaptation to low-intensity exercise. Male C57BL/6J wildtype mice were subjected to 6-weeks of voluntary wheel running or normal cage activities with or without simvastatin treatment (20 mg/kg/d, n = 7-8 per group). Adaptations in in vivo fatigue resistance were determined by a treadmill running test, and by ankle plantarflexor contractile assessment. The tibialis anterior, gastrocnemius, and plantaris muscles were evaluated for exercised-induced mitochondrial adaptations (i...
2017: PloS One
https://www.readbyqxmd.com/read/28207531/delayed-effort-induced-swelling-with-myofasciitis-and-systemic-manifestations-a-so-far-unrecognized-type-of-pressure-induced-urticaria
#10
Anne-Claire Bursztejn, Dan Lipsker
Diseases characterized by recurrent symptoms with prolonged intervals without any clinical manifestations can pose diagnostic difficulties. Some diagnoses will be obvious but other situations can be very challenging.To nosologically delineate a new entity characterized by recurrent flares of induration of the forearms and legs with swelling of the extremities accompanied by intense fatigue and variable other symptoms.Retrospective observational study of patients recorded from 2000 to 2015. All patients included were seen during a consultation at the Dermatology Department of the University Hospital of Strasbourg, France...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28199218/surface-emg-and-muscle-fatigue-multi-channel-approaches-to-the-study-of-myoelectric-manifestations-of-muscle-fatigue
#11
Marco Gazzoni, Alberto Botter, Taian Vieira
On a broad view, fatigue is used to indicate a somewhat degree of weariness. On the muscular level, fatigue posits the reduced capacity of muscle fibres to produce force, even in the presence of motor neuron excitation via either spinal mechanisms or electric pulses applied externally. Prior to decreased force, when sustaining physically demanding tasks, alterations in the muscle electrical properties take place. These alterations, termed myoelectric manifestation of fatigue, can be assessed non-invasively with a pair of surface electrodes positioned appropriately on the target muscle; traditional approach...
February 15, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28198046/muscle-fatigability-and-depressive-symptoms-in-later-life
#12
Patrick J Brown, Dala Badreddine, Steven P Roose, Bret Rutherford, Hilsa N Ayonayon, Kristine Yaffe, Eleanor M Simonsick, Bret Goodpaster
OBJECTIVE: Fatigability is the degree to which performance decreases during a specific activity of a given intensity and duration. Depression is known to heighten subjective fatigue, but whether its association with physical fatigability is unknown. Further, whether fatigability is a precursor or risk factor for the development of subsequent depressive symptoms is also unclear. METHODS: Data are from the Health Aging and Body Composition Study with fatigability assessed using isokinetic dynamometry of the knee extensors at year 3, and depressive symptoms ascertained longitudinally using the Center for Epidemiologic Studies Depression (CES-D) scale...
February 15, 2017: International Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/28194519/electromechanical-delays-during-a-fatiguing-exercise-and-recovery-in-patients-with-myotonic-dystrophy-type-1
#13
Fabio Esposito, Emiliano Cè, Susanna Rampichini, Elena Monti, Eloisa Limonta, Barbara Fossati, Giovanni Meola
PURPOSE: The partitioning of the electromechanical delay by an electromyographic (EMG), mechanomyographic (MMG) and force combined approach can provide further insight into the electrochemical and mechanical processes involved with skeletal muscle contraction and relaxation. The aim of the study was to monitor by this combined approach the changes in delays' electrochemical and mechanical components throughout a fatiguing task and during recovery in patients with myotonic dystrophy type 1 (DM1), who present at the skeletal muscle level fibres rearrangement, muscle weakness and myotonia, especially in the distal muscles...
February 14, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28193888/interleukin-37-reverses-the-metabolic-cost-of-inflammation-increases-oxidative-respiration-and-improves-exercise-tolerance
#14
Giulio Cavalli, Jamie N Justice, Kristen E Boyle, Angelo D'Alessandro, Elan Z Eisenmesser, Jonathan J Herrera, Kirk C Hansen, Travis Nemkov, Rinke Stienstra, Cecilia Garlanda, Alberto Mantovani, Douglas R Seals, Lorenzo Dagna, Leo A B Joosten, Dov B Ballak, Charles A Dinarello
IL-1 family member interleukin 37 (IL-37) has broad antiinflammatory properties and functions as a natural suppressor of innate inflammation. In this study, we demonstrate that treatment with recombinant human IL-37 reverses the decrease in exercise performance observed during systemic inflammation. This effect was associated with a decrease in the levels of plasma and muscle cytokines, comparable in extent to that obtained upon IL-1 receptor blockade. Exogenous administration of IL-37 to healthy mice, not subjected to an inflammatory challenge, also improved exercise performance by 82% compared with vehicle-treated mice (P = 0...
February 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28190980/effect-of-low-dose-short-term-creatine-supplementation-on-muscle-power-output-in-elite-youth-soccer-players
#15
Aquiles Yáñez-Silva, Cosme F Buzzachera, Ivan Da C Piçarro, Renata S B Januario, Luis H B Ferreira, Steven R McAnulty, Alan C Utter, Tacito P Souza-Junior
BACKGROUND: To determine the effects of a low dose, short-term Creatine monohydrate (Cr) supplementation (0.03 g.kg.d(-1) during 14 d) on muscle power output in elite youth soccer players. METHODS: Using a two-group matched, double blind, placebo-controlled design, nineteen male soccer players (mean age = 17.0 ± 0.5 years) were randomly assigned to either Cr (N = 9) or placebo (N = 10) group. Before and after supplementation, participants performed a 30s Wingate Anaerobic Test (WAnT) to assess peak power output (PPO), mean power output (MPO), fatigue index (FI), and total work...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28187266/short-term-effects-of-troxerutin-vitamin-p4-on-muscle-fatigue-and-genes-expression-of-bcl-2-and-bax-in-the-hepatic-tissue-of-rats
#16
Mohammad Zamanian, Ali Shamsizadeh, Ali Esmaeili Nadimi, Mohammad R Hajizadeh, Fatemeh Allatavakoli, Mohammad R Rahmani, Ayat Kaeidi, Hamid R Safari Khalegh, Mohammad Allahtavakoli
In the current study, the effects of troxerutin (TXER) on muscle fatigue and genes expression of Bcl-2 and Bax in the hepatic tissue of rats was investigated. 40 male Wistar rats were randomly divided into four groups and designated as control and TXER treatment at 75 (TXER75), 150 (TXER150), and 300 mg/kg/day (TXER300). The treated groups and control group received TXER and water orally for 7 days. After an exhaustive swimming test on the 7th day, all animals were sacrificed immediately and several biochemical parameters related to fatigue and genes expression of Bcl-2 and Bax in the hepatic tissue were measured...
February 10, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28186390/pain-management-in-the-ehlers-danlos-syndromes
#17
Pradeep Chopra, Brad Tinkle, Claude Hamonet, Isabelle Brock, Anne Gompel, Antonio Bulbena, Clair Francomano
Chronic pain in the Ehlers-Danlos syndromes (EDS) is common and may be severe. According to one study, nearly 90% of patients report some form of chronic pain. Pain, which is often one of the first symptoms to occur, may be widespread or localized to one region such as an arm or a leg. Studies on treatment modalities are few and insufficient to guide management. The following is a discussion of the evidence regarding the underlying mechanisms of pain in EDS. The causes of pain in this condition are multifactorial and include joint subluxations and dislocations, previous surgery, muscle weakness, proprioceptive disorders, and vertebral instability...
February 10, 2017: American Journal of Medical Genetics. Part C, Seminars in Medical Genetics
https://www.readbyqxmd.com/read/28182134/differential-pharmacology-and-clinical-utility-of-sonidegib-in-advanced-basal-cell-carcinoma
#18
REVIEW
Mohd Wahid, Arshad Jawed, Sajad Ahmad Dar, Raju K Mandal, Shafiul Haque
Patients suffering from advanced basal cell carcinoma (BCC) have very limited treatment options. Sonidegib selectively inhibits the growth of Hedgehog pathway-dependent tumors and can treat locally advanced BCC patients who are not candidates for surgery or radiation therapy. The BOLT clinical trials were conducted to evaluate the efficacy/potency of sonidegib in the treatment of advanced BCC or metastatic BCC. The patients were randomized in 1:2 ratios to receive 200 or 800 mg oral sonidegib daily, stratified by disease, histological subtype and geographical region...
2017: OncoTargets and Therapy
https://www.readbyqxmd.com/read/28181834/functioning-without-cartilage-older-people-with-radiographic-knee-osteoarthritis-who-self-report-no-functional-limitations-do-score-lower-on-a-performance-battery
#19
Daniël M van Leeuwen, Fabian van de Bunt, Cornelis J de Ruiter, Natasja M van Schoor, Dorly J H Deeg, Kaj S Emanuel
The majority of the older population shows signs of radiographic knee osteoarthritis. However, many remain without functional complaints for a long period. This study aims to find early functional changes associated with stages of radiographic knee osteoarthritis. A group of older people without self-reported complaints was divided in 2 groups, knee osteoarthritis (K&L=2-4, N=29) and control (K&L=0-1, N=31). Muscle function was assessed with voluntary and electrically stimulated isometric knee contractions, including a fatigue test...
February 9, 2017: Journal of Aging and Physical Activity
https://www.readbyqxmd.com/read/28181352/benign-mitochondrial-myopathy-with-exercise-intolerance-in-a-large-multigeneration-family-due-to-a-homoplasmic-m-3250t-c-mutation-in-mttl1
#20
N Darin, C Hedberg-Oldfors, A-K Kroksmark, A-R Moslemi, G Kollberg, A Oldfors
BACKGROUND AND PURPOSE: Most mitochondrial disorders with onset in early childhood are progressive and involve multiple organs. The m.3250T>C mutation in MTTL1 has previously been described in a few individuals with a possibly riboflavin-responsive myopathy and an association with sudden infant death syndrome was suspected. We describe a large family with this mutation and evaluate the effect of riboflavin treatment. METHODS: Medical data were collected with the help of a standardized data collection form...
February 9, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
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