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Muscular fatigue

Sarah Youssof, Carol Romero-Clark, Teddy Warner, Emily Plowman
INTRODUCTION: The Swallowing Quality of Life instrument (SWAL-QOL) is a patient-reported outcome (PRO) measure of swallowing-related quality of life (SR-QoL). Its psychometric properties in oculopharyngeal muscular dystrophy (OPMD) are not known. METHODS: We administered the SWAL-QOL to U.S. OPMD Registry participants. We described SR-QoL profiles and assessed reliability and validity. RESULTS: Mean composite score in 113 individuals with OPMD was 54...
October 19, 2016: Muscle & Nerve
E Sebastião, E A Hubbard, R E Klaren, L A Pilutti, R W Motl
This study compared physical fitness components between fatigued and non-fatigued persons with MS and examined those components as correlates of fatigue. Sixty-two ambulatory persons with MS completed the Modified Fatigue Impact Scale (MFIS) and underwent assessments of cardiorespiratory capacity, lower extremity muscle strength (i.e., peak torque and asymmetry), body composition, and static balance over two different sessions 7 days apart. Participants were allocated into fatigue groups based on MFIS scores (non-fatigued group (i...
October 17, 2016: Scandinavian Journal of Medicine & Science in Sports
Afshin Samani, Divya Srinivasan, Svend Erik Mathiassen, Pascal Madeleine
The spatio-temporal distribution of muscle activity has been suggested to be a determinant of fatigue development. Pursuing this hypothesis, we investigated the pattern of muscular activity in the shoulder and arm during a repetitive dynamic task performed until participants' rating of perceived exertion reached 8 on Borg's CR-10 scale. We collected high-density surface electromyogram (HD-EMG) over the upper trapezius, as well as bipolar EMG from biceps brachii, triceps brachii, deltoideus anterior, serratus anterior, upper and lower trapezius from 21 healthy women...
October 14, 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Minas Nalbandian, Masaki Takeda
Lactate (or its protonated form: lactic acid) has been studied by many exercise scientists. The lactate paradigm has been in constant change since lactate was first discovered in 1780. For many years, it was unfairly seen as primarily responsible for muscular fatigue during exercise and a waste product of glycolysis. The status of lactate has slowly changed to an energy source, and in the last two decades new evidence suggests that lactate may play a much bigger role than was previously believed: many adaptations to exercise may be mediated in some way by lactate...
October 8, 2016: Biology
Amir Hadi, Makan Pourmasoumi, Marzieh Kafeshani, Jahangir Karimian, Mohammad Reza Maracy, Mohammad Hasan Entezari
OBJECTIVE: Additional oxygen consumption during intense exercises may lead to oxidative stress and contribute to muscular fatigue. Green tea and sour tea (Hibiscus sabdariffa L.), which contain various flavonoids and polyphenols, have many healthful properties such as anticarcinogenic, anti-inflammatory, and heart protecting effects. The aim of the present study was to assess the effects of green tea and sour tea supplementation on oxidative stress and muscle damage in soccer athletes...
October 13, 2016: Journal of Dietary Supplements
Michal Elboim-Gabyzon, Osnat Atun-Einy, Insaf Khoury-Assaf
PURPOSE: To review the literature on the existent evidence considering the use of power wheel chair (PWC) for children with DMD who can still walk independently. METHODS: A systematic literature search was conducted through nine databases by the three authors independently. Both quantitative and qualitative research designs were considered for inclusion. Studies were included only if the study population consisted of ambulatory children diagnosed with DMD. Data extraction was on participant characteristics, level of walking and on outcomes in term of impairment, function and participation domains (ICF, World Health Organization, 2001) in accordance to a structured diagram by the three authors independently...
October 9, 2016: Disability and Rehabilitation
Florian Monjo, Nicolas Forestier
Muscle fatigue modifies the gain between motor command magnitude and the mechanical muscular response. In other words, post-fatigue, central drives to the muscles must increase to maintain a particular submaximum mechanical output. In this study, we tested the hypothesis that this modified gain can be predicted by the central nervous system (CNS) during discrete ballistic movements. In two separate experiments, subjects were required to perform shoulder flexions in standing and sitting positions at submaximum target peak accelerations...
September 30, 2016: Neuroscience
Chelsea Starbuck, Victoria Stiles, Daniel Urà, Matt Carré, Sharon Dixon
OBJECTIVES: To examine the influence of clay court frictional properties on tennis players' biomechanical response. DESIGN: Repeated measures. METHODS: Lower limb kinematic and force data were collected on sixteen university tennis players during 10×180° turns (running approach speed 3.9±0.20ms(-1)) on a synthetic clay surface of varying friction levels. To adjust friction levels the volume of sand infill above the force plate was altered (kg per m(2) surface area; 12, 16 and 20kgm(-2))...
September 1, 2016: Journal of Science and Medicine in Sport
Paulo Gentil, James Fisher, James Steele
Resistance exercises can be considered to be multi-joint (MJ) or single-joint (SJ) in nature. Many strength coaches, trainers, and trainees believe that adding SJ exercises to a resistance training (RT) program may be required to optimize muscular size and strength. However, given that lack of time is a frequently cited barrier to exercise adoption, the time commitment resulting from these recommendations may not be convenient for many people. Therefore, it is important to find strategies that reduce the time commitment without negatively affecting results...
September 27, 2016: Sports Medicine
David Chaparro, Justine Lacroix, Benoit Borel, Jean-Yves Salle, Benjamin Kammoun, Jean-Christophe Daviet, Stéphane Mandigout
OBJECTIVE: Physical activity (PA) and exercise are two successful approaches to reduce sedentary behavior and risk managing in stroke patients. The aims of the study are to evaluate PA and physical inactivity levels in post-stroke patients and to correlate PA parameters with gait performance, fatigue, anxiety, and anthropometry parameters in subacute phase of stroke recovery. MATERIAL/PATIENTS AND METHODS: Preliminary analysis of 24 patients in PA incitation program (mean age: 61...
September 2016: Annals of Physical and Rehabilitation Medicine
Veronica Southard, Joanne DiFrancisco-Donoghue, James Mackay, Stephanie Idjadi, Neil Wright
BACKGROUND: Symptoms of Parkinson's disease (PD) include bradykinesia, gait abnormalities, balance deficits, restless leg syndrome, and muscular fatigue. Compression garments (CG) have been shown to improve performance in athletes by increasing venous return and reduce lactic acid. OBJECTIVE: Assess the effect of compression garments on the performance of 3 standardized functional tests in persons with PD. METHODOLOGY: The functional tests selected represented strength, endurance, and mobility measures in individuals with PD...
July 2016: International Journal of Health Sciences
Patrizia Proia, Carlo Maria Di Liegro, Gabriella Schiera, Anna Fricano, Italia Di Liegro
More than two hundred years after its discovery, lactate still remains an intriguing molecule. Considered for a long time as a waste product of metabolism and the culprit behind muscular fatigue, it was then recognized as an important fuel for many cells. In particular, in the nervous system, it has been proposed that lactate, released by astrocytes in response to neuronal activation, is taken up by neurons, oxidized to pyruvate and used for synthesizing acetyl-CoA to be used for the tricarboxylic acid cycle...
2016: International Journal of Molecular Sciences
Mónica González, Emilio Macias-Escalada, Juan Cobo, Maria Pilar Fernández Mondragón, Gerardo Gómez-Moreno, Marian Martínez-Martínez, Felix de Carlos
BACKGROUND: Statins are considered the most effective drugs used in the treatment of dyslipidemias. Some of their adverse effects are related to muscle problems. Myalgias produced by statins appear more often during exercise. Mandibular advancement devices (MAD) force the propulsory and elevatory musculature of the mandible to exercise by making the jaw move forward. The aim of this study is to evaluate the incidence of muscular side effects (referred, spontaneous, or under palpation pain, myofascial pain, mandibular rigidity and fatigue, tension and sensitivity of the masticatory muscles) in a group of patients with a diagnosis of obstructive sleep apnea being treated with MAD...
August 25, 2016: Sleep & Breathing, Schlaf & Atmung
Olivia Bruce, Kimberly Moull, Steven Fischer
The upper extremities play an important role in managing the rope-turning technique required to perform continuous double unders. However, acute adaptions in this technique may occur as a jumper fatigues. The purpose of this study was to examine how turning technique is adapted with fatigue. Three-dimensional kinematic data of the upper extremity were collected from 10 trained athletes as they performed consecutive double unders to volitional fatigue. Time series wrist, elbow and shoulder joint angles were calculated where joint angle waveforms representing 10 unique trials from the beginning ("fresh") and end ("fatigued") of the continuous jumping protocol for all participants were analysed using principal component analysis...
August 24, 2016: Journal of Sports Sciences
Camila D Lima, Lee E Brown, Megan A Wong, Whitney D Leyva, Ronei S Pinto, Eduardo L Cadore, Cassio V Ruas
Stretching is used to increase joint range of motion, but the acute effects can decrease muscle strength. However, this may depend on the population or mode of stretching. The purpose of this study was to compare the acute effects of static vs. ballistic stretching on strength and muscular fatigue between ballet dancers and resistance trained women. Fifteen resistance trained women (age 23.8 ± 1.80 yrs, mass 67.47 ± 7.77 kg, ht 168.30 ± 5.53 cm) and 12 ballet dancers (age 22.8 ± 3.04 yrs, mass 58.67 ± 5...
August 18, 2016: Journal of Strength and Conditioning Research
J Padulo, L P Ardigò, G Attene, C Cava, D P Wong, K Chamari, G M Migliaccio
This study aimed to describe a gradient repeated sprint ability (RSA) test in comparison with a standard level one by investigating performance, metabolic demand and muscular jumping performance as a proxy for running mechanics. Eighteen athletes performed two level RSA tests (40 m × 6) - for reliability evaluation - and one ±5% gradient RSA test, second leg downhill (RSAgrad). Rating of perceived exertion (RPE), blood lactate concentration (BLa) concentration, vertical jump heights were assessed as well...
August 18, 2016: Research in Sports Medicine
Caroline Martin, Benoit Bideau, Paul Delamarche, Richard Kulpa
The aim of this study was to quantify kinematic, kinetic and performance changes that occur in the serve throughout a prolonged tennis match play. Serves of eight male advanced tennis players were recorded with a motion capture system before, at mid-match, and after a 3-hour tennis match. Before and after each match, electromyographic data of 8 upper limb muscles obtained during isometric maximal voluntary contraction were compared to determine the presence of muscular fatigue. Vertical ground reaction forces, rating of perceived exertion, ball speed, and ball impact height were measured...
2016: PloS One
Peter Ertl, Annika Kruse, Markus Tilp
The aim of the current paper was to systematically review the relevant existing electromyographic threshold concepts within the literature. The electronic databases MEDLINE and SCOPUS were screened for papers published between January 1980 and April 2015 including the keywords: neuromuscular fatigue threshold, anaerobic threshold, electromyographic threshold, muscular fatigue, aerobic-anaerobictransition, ventilatory threshold, exercise testing, and cycle-ergometer. 32 articles were assessed with regard to their electromyographic methodologies, description of results, statistical analysis and test protocols...
October 2016: Journal of Electromyography and Kinesiology
Landry-Cyrille Bankolé, Guillaume Y Millet, John Temesi, Damien Bachasson, Marion Ravelojaona, Bernard Wuyam, Samuel Verges, Elodie Ponsot, Jean-Christophe Antoine, Fawzi Kadi, Léonard Féasson
BACKGROUND: Previous randomized controlled trials investigating exercise training programs in facioscapulohumeral muscular dystrophy (FSHD) patients are scarce and of short duration only. This study assessed the safety and efficacy of a 6-month home-based exercise training program on fitness, muscle, and motor function in FSHD patients. METHODS: Sixteen FSHD patients were randomly assigned to training (TG) and control (CG) groups (both n = 8) in a home-based exercise intervention...
August 2016: Medicine (Baltimore)
Caterina Tramonti, Bruno Rossi, Carmelo Chisari
Low-intensity aerobic training seems to have positive effects on muscle strength, endurance and fatigue in Becker Muscular Dystrophy (BMD) patients. We describe the case of a 33-year old BMD man, who performed a four-week aerobic training. Extensive functional evaluations were executed to monitor the efficacy of the rehabilitative treatment. Results evidenced an increased force exertion and an improvement in muscle contraction during sustained exercise. An improvement of walk velocity, together with agility, endurance capacity and oxygen consumption during exercise was observed...
June 13, 2016: European Journal of Translational Myology
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