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Neuromuscular fatigue

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https://www.readbyqxmd.com/read/29130599/interstitial-microdeletion-of-17q11-2-is-associated-with-hypotonia-fatigue-intellectual-disability-and-a-subtle-facial-phenotype-in-three-unrelated-patients
#1
Deborah Osio, Julia Rankin, Hannele Koillinen, Adele Reynolds, Hilde Van Esch
Over the past decade chromosomal microarray analysis (array CGH) has allowed the discovery of many novel disease-causing recurrent microdeletion and microduplication syndromes. Here we present three unrelated patients (2F; 1M) from three different countries, with developmental delay, intellectual disability, hypotonia, fatigue, and highly similar dysmorphic facial features. Shared facial features are a broad and wide forehead, similar shape of the eyes with long palpebral fissures, a bulbous tip of the nose and thick lips...
November 12, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/29125079/-relapse-of-chronic-inflammatory-demyelinating-polyneuropathy-following-treatment-with-zoledronic-acid
#2
M Loef, E C T Geijteman, K J Beelen, M Bornebroek, D H Schweitzer
BACKGROUND: Zoledronic acid is a nitrogen-containing bisphosphonate that is frequently used in the treatment of osteoporosis. Many patients experience a so-called acute-phase reaction during initial treatment; this is characterized by flu-like symptoms and fever. CASE DESCRIPTION: We describe a 61-year-old woman who suffered from chronic inflammatory demyelinating polyneuropathy (CIDP), and who was started on intravenous zoledronic acid treatment as adjuvant therapy for breast cancer...
2017: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/29119418/low-level-laser-therapy-improves-the-vo2-kinetics-in-competitive-cyclists
#3
Fábio J Lanferdini, Renata L Krüger, Bruno M Baroni, Caetano Lazzari, Pedro Figueiredo, Alvaro Reischak-Oliveira, Marco A Vaz
Some evidence supports that low-level laser therapy (LLLT) reduces neuromuscular fatigue, so incrementing sports performance. A previous randomized controlled trial of our group showed increased exercise tolerance in male competitive cyclists treated with three different LLLT doses (3, 6, and 9 J/diode; or 135, 270, and 405 J/thigh) before time-to-exhaustion cycling tests. Now, the present study was designed to evaluate the effects of these LLLT doses on the VO2 kinetics of athletes during cycling tests. Twenty male competitive cyclists (29 years) participated in a crossover, randomized, double-blind, and placebo-controlled trial...
November 9, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29118954/measuring-system-and-method-of-determining-the-adaptive-force
#4
Laura Schaefer, Marko Hoff, Frank Bittmann
The term Adaptive Force (AF) describes the capability of adaptation of the nerve-muscle-system to externally applied forces during isometric and eccentric muscle action. This ability plays an important role in real life motions as well as in sports. The focus of this paper is on the specific measurement method of this neuromuscular action, which can be seen as innovative. A measuring system based on the use of compressed air was constructed and evaluated for this neuromuscular function. It depends on the physical conditions of the subject, at which force level it deviates from the quasi isometric position and merges into eccentric muscle action...
June 27, 2017: European Journal of Translational Myology
https://www.readbyqxmd.com/read/29118716/etiology-and-recovery-of-neuromuscular-fatigue-following-competitive-soccer-match-play
#5
Callum G Brownstein, Jack P Dent, Paul Parker, Kirsty M Hicks, Glyn Howatson, Stuart Goodall, Kevin Thomas
Aim: Previous research into the etiology of neuromuscular fatigue following competitive soccer match-play has primarily focused on peripheral perturbations, with limited research assessing central nervous system function in the days post-match. The aim of the present study was to examine the contribution and time-course of recovery of central and peripheral factors toward neuromuscular fatigue following competitive soccer match-play. Methods: Sixteen male semi-professional soccer players completed a 90-min soccer match...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29117071/deception-improves-tt-performance-in-well-trained-cyclists-without-augmented-fatigue
#6
Paul Ansdell, Kevin Thomas, Glyn Howatson, Markus Amann, Stuart Goodall
PURPOSE: To investigate the effects of feedback, in the form of a virtual avatar paced at 100 and 102% of baseline performance, on neuromuscular fatigue following a 4 km cycling time trial (TT). We hypothesised that improved cycling performance would occur due to participants exceeding a previously established critical threshold, and experiencing greater neuromuscular fatigue. METHODS: Following familiarisation, ten well-trained cyclists performed a baseline 4 km TT without feedback (BASE), followed by two, 4 km TT where they raced against an avatar (set at 100% [accurate - ACC] and 102% [deception - DEC] of baseline power output), in a randomised and counterbalanced order...
November 7, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29116571/quality-of-life-in-adult-patients-with-limb-girdle-muscular-dystrophies
#7
Marina Peric, Stojan Peric, Jelena Stevanovic, Sara Milovanovic, Ivana Basta, Ana Nikolic, Aleksandra Kacar, Vidosava Rakocevic-Stojanovic
Although limb-girdle muscular dystrophies (LGMD) can cause permanent disability, to date there are no studies that examined quality of life (QoL) in these patients. Our aim was to evaluate QoL in patients with LGMD, and to identify the most significant predictors of QoL. The study comprised 46 patients with diagnosis of limb-girdle muscular weakness. QoL in patients was evaluated using two scales-SF-36 questionnaire and the Individualized Neuromuscular Quality of Life questionnaire (INQoL). Following scales were also applied: Epworth Sleepiness Scale (ESS), Hamilton Scale for Depression (HamD), and Krupp's Fatigue Severity Scale (FSS)...
November 7, 2017: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/29112627/impact-of-blood-flow-restriction-exercise-on-muscle-fatigue-development-and-recovery
#8
Florian Husmann, Thomas Mittlmeier, Sven Bruhn, Volker Zschorlich, Martin Behrens
PURPOSE: The present study was designed to provide mechanistic insight into the time-course and etiology of muscle fatigue development and recovery during and after low-intensity exercise when it is combined with blood flow restriction (BFR). METHODS: Seventeen resistance-trained males completed four sets of low-intensity isotonic resistance exercise under two experimental conditions: knee extension exercise combined with (i) BFR and (ii) without BFR (CON). Neuromuscular tests were performed before, during (immediately after each set of knee extension exercise) and 1, 2, 4, and 8 min after each experimental condition...
November 6, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29100827/sex-differences-in-neuromuscular-fatigability-in-response-to-load-carriage-in-the-field-in-british-army-recruits
#9
Thomas J O'Leary, Samantha C Saunders, Stephen J McGuire, Rachel M Izard
OBJECTIVES: Women are resistant to neuromuscular fatigue compared to men in response to a range of exercise tasks. The sex differences in the neuromuscular responses to load carriage have yet to be investigated. DESIGN: Prospective cohort study. METHODS: Twenty-three male and 19 female British Army recruits completed a 9.7km loaded march within 90min, with the weight carried dependent on military trade (16±2kg for men and 15±1kg for women)...
October 23, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29098658/acute-and-residual-soccer-match-related-fatigue-a-systematic-review-and-meta-analysis
#10
REVIEW
J R Silva, M C Rumpf, M Hertzog, C Castagna, A Farooq, O Girard, K Hader
BACKGROUND: Understanding soccer players' match-related fatigue and recovery profiles likely helps with developing conditioning programs that increase team performance and reduce injuries and illnesses. In order to improve match recovery (the return-to-play process and ergogenic interventions) it is also pivotal to determine if match simulation protocols and actual match-play lead to similar responses. OBJECTIVES: (1) To thoroughly describe the development of fatigue during actual soccer match play and its recovery time course in terms of physiological, neuromuscular, technical, biochemical and perceptual responses, and (2) to determine similarities of recovery responses between actual competition (11 vs...
November 2, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29084095/a-multiple-repeated-sprint-ability-test-for-badminton-players-involving-four-changes-of-direction-validity-and-reliability-part-1
#11
Michael Phomsoupha, Quentin Berger, Guillaume Laffaye
The purpose of the present study was: i) to develop a new sport-specific, repeated sprint ability test involving four changes of direction, namely, the multiple repeated sprint ability (MRSAB) test for badminton players; ii) to determine its validity by comparing the results of five different skill levels; and iii) to assess the link between the new test and neuromuscular lower limb and physiological variables. For this purpose, 42 participants were separated into five groups in order to perform the MRSAB test at the same time of day, on two occasions, separated by at least 48 hours...
October 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29083128/acute-neuromuscular-cognitive-and-physiological-responses-to-a-japanese-kickboxing-competition-in-semi-professional-fighters
#12
Giuseppe Cimadoro
BACKGROUND: Japanese kickboxing is a combat sport designed to accommodate fighters from different combat sports styles. However, the physiological profile of this discipline is unknown. Therefore, this study describes the neuromuscular, metabolic and cognitive responses to an official Japanese kickboxing (K-1) fight in 8 kickboxers. METHODS: Measurements before and after the competition involved a simple reaction time test (SRT), countermovement jump (CMJ), blood lactate (BLA) and rating of perceived exertion (RPE)...
October 27, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29072114/a-customised-cold-water-immersion-protocol-favours-one-size-fits-all-protocols-in-improving-acute-performance-recovery
#13
Coen S Zandvoort, Jelmer R de Zwart, Brenda L van Keeken, Patrick J F Viroux, Ivo J H Tiemessen
The purpose of the present study was to investigate whether a customised cold-water immersion (CWIc) protocol was more effective in enhancing acute performance recovery than a one-size-fits-all CWI (CWIs) or active recovery (AR) protocol. On three separate testing days, 10 healthy, physically active, non-smoking males completed the same fatiguing protocol (60 squat jumps and a 2'30″ all-out cycling time-trial) followed by CWIc (12°C, 10-17 min), CWIs (15°C, 10 min) or AR (60 W, 10 min). Outcome measures to assess acute recovery were heart rate variability (HRV) as HRVrecovery, muscle power (MP) as absolute and relative decline, and muscle soreness (MS) at 0 and 24 h...
October 26, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29072031/wellness-muscle-soreness-and-neuromuscular-performance-during-a-training-week-in-volleyball-athletes
#14
Francisco Tavares, Mário Simões, Bruno Matos, Tiaki B Smith, Matthew Driller
BACKGROUND: The purpose of the current study is to analyse the acute effects of volleyball training and to compare the responses of different perceptual and neuromuscular measures to overall training load. METHODS: The training load, wellness, neuromuscular performance and perceptual measures of soreness of 13 highly-trained volleyball athletes (18 ± 1 years; 187.1 ± 7.0 cm; 84.3 ± 10.3 kg) representing the Portugal under-19 national team were monitored during a training week...
October 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29065079/leg-stiffness-in-female-soccer-players-intersession-reliability-and-the-fatiguing-effects-of-soccer-specific-exercise
#15
Mark B A De Ste Croix, Jonathan D Hughes, Rhodri S Lloyd, Jon L Oliver, Paul J Read
De Ste Croix, MBA, Hughes, JD, Lloyd, RS, Oliver, JL, and Read, PJ. Leg stiffness in female soccer players: intersession reliability and the fatiguing effects of soccer-specific exercise. J Strength Cond Res 31(11): 3052-3058, 2016-Low levels of leg stiffness and reduced leg stiffness when fatigue is present compromise physical performance and increase injury risk. The purpose of this study was to (a) determine the reliability of leg stiffness measures obtained from contact mat data and (b) explore age-related differences in leg stiffness after exposure to a soccer-specific fatigue protocol in young female soccer players...
November 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29053725/the-effects-of-training-with-loads-that-maximise-power-output-and-individualised-repetitions-vs-traditional-power-training
#16
J M Sarabia, M Moya-Ramón, J L Hernández-Davó, J Fernandez-Fernandez, R Sabido
BACKGROUND: It has been suggested that strength training effects (i.e. neural or structural) vary, depending on the total repetitions performed and velocity loss in each training set. PURPOSE: The aim of this study is to compare the effects of two training programmes (i.e. one with loads that maximise power output and individualised repetitions, and the other following traditional power training). METHODS: Twenty-five males were divided into three groups (optimum power [OP = 10], traditional training [TT = 9] and control group [CG = 6])...
2017: PloS One
https://www.readbyqxmd.com/read/29023327/sodium-bicarbonate-supplementation-delays-neuromuscular-fatigue-without-changes-in-performance-outcomes-during-a-basketball-match-simulation-protocol
#17
Paul Ansdell, Jeanne Dekerle
PURPOSE: To investigate the development of neuromuscular fatigue during a basketball game simulation and ascertain whether sodium bicarbonate (NaHCO3) supplementation attenuates any neuromuscular fatigue that persists. METHODS: Ten participants ingested 0.2 g.kg of NaHCO3 (or an equimolar placebo dosage of sodium chloride [NaCl]) 90 and 60 minutes prior to commencing a basketball game simulation (ALK-T vs PLA-T). Isometric maximal voluntary contractions of the knee extensors (MVIC) and potentiated high (100 Hz) and low (10 Hz) frequency doublet twitches were recorded before and after each match quarter for both trials...
October 10, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29020968/robot-assisted-assessment-of-muscle-strength
#18
REVIEW
Marco Toigo, Martin Flück, Robert Riener, Verena Klamroth-Marganska
Impairment of neuromuscular function in neurological disorders leads to reductions in muscle force, which may lower quality of life. Rehabilitation robots that are equipped with sensors are able to quantify the extent of muscle force impairment and to monitor a patient during the process of neurorehabilitation with sensitive and objective assessment methods. In this article, we provide an overview of fundamental aspects of muscle function and how the corresponding variables can be quantified by means of meaningful robotic assessments that are primarily oriented towards upper limb neurorehabilitation...
October 11, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/29016480/revisiting-the-single-visit-protocol-for-determining-the-electromyographic-fatigue-threshold
#19
Fatin L Khan, Jordan M Lawal, Drew O Kapture, Joseph D Swingle, Moh H Malek
The electromyographic fatigue threshold (EMGFT) has been shown to demarcate between non-fatiguing and fatiguing exercise workloads. One potential limitation of incorporating the single EMGFT test in a clinical setting is the 2-min stage increment inherit to the protocol. In most rehabilitation clinics time with the client is limited and any testing procedures need to consider this factor. The purpose of this study, therefore, was to determine whether or not the estimation of the EMGFT is influenced by reducing the incremental stage to 1-min intervals...
October 7, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28991045/caffeine-ingestion-attenuates-fatigue-induced-loss-of-muscle-torque-complexity
#20
Jamie Pethick, Samantha L Winter, Mark Burnley
The temporal structure, or complexity, of muscle torque output decreases with neuromuscular fatigue. The role of central fatigue in this process is unclear. PURPOSE: We tested the hypothesis that caffeine administration would attenuate the fatigue-induced loss of torque complexity. METHODS: Eleven healthy participants performed intermittent isometric contractions of the knee extensors to task failure at a target torque of 50% maximal voluntary contraction (MVC), with a 60% duty factor (6 s contraction, 4 s rest), 60 min after ingesting 6 mg·kg caffeine or a placebo...
October 3, 2017: Medicine and Science in Sports and Exercise
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