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Neuromuscular fatigue

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https://www.readbyqxmd.com/read/29792554/effect-of-acetazolamide-and-methazolamide-on-diaphragm-and-dorsiflexor-fatigue-a-randomized-controlled-trial
#1
Paolo B Dominelli, Chris J McNeil, Tyler Dennis Vermeulen, Troy J R Stuckless, Courtney V Brown, Giulio S Dominelli, Erik Richard Swenson, Lucas J Teppema, Glen Edward Foster
Acetazolamide, a carbonic anhydrase (CA) inhibitor used clinically and to prevent acute mountain sickness, worsens skeletal muscle fatigue in animals and humans. In animals, methazolamide, a methylated analogue of acetazolamide and an equally potent CA inhibitor, reportedly exacerbates fatigue less than acetazolamide. Accordingly, we sought to determine, in humans, if methazolamide would attenuate diaphragm and dorsiflexor fatigue compared to acetazolamide. Healthy men (dorsiflexor: n=12; diaphragm: n=7) performed fatiguing exercise on three occasions, after ingesting acetazolamide (250 mg three times a day) and then in random order, methazolamide (100 mg twice a day) or placebo for 48 h...
May 24, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29787475/isometric-versus-dynamic-measurements-of-fatigue-does-age-matter-a-meta-analysis
#2
Renata L Krüger, Saied Jalal Aboodarda, Pierre Samozino, Charles L Rice, Guillaume Y Millet
PURPOSE: The assessment of power changes after fatiguing exercise provides important additional information about neuromuscular function compared to traditional isometric measurements, especially when exploring age-related changes in fatigability. Therefore, the aim of this review was to explore the effects of age on neuromuscular fatigue (NMF) when measured in isometric compared with dynamic contractions. The importance of central and peripheral mechanisms contributing to age-related NMF were discussed...
May 22, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29770120/multiparametric-analysis-of-sniff-nasal-inspiratory-pressure-test-in-middle-stage-amyotrophic-lateral-sclerosis
#3
Antonio Sarmento, Andrea Aliverti, Layana Marques, Francesca Pennati, Mario Emílio Dourado-Júnior, Guilherme Fregonezi, Vanessa Resqueti
The relaxation rates and contractile properties of inspiratory muscles are altered with inspiratory muscle weakness and fatigue. This fact plays an important role in neuromuscular disorders patients and had never been extensively studied in amyotrophic lateral sclerosis (ALS). In this cross-sectional study, these parameters were investigated non-invasively through nasal inspiratory sniff pressure test (SNIP) in 39 middle stage spinal onset ALS subjects and compared with 39 healthy controls. ALS patients were also divided into three subgroups according to a decline in their percentage of predicted forced vital capacity (FVC%pred ) as well as a decline in the ALS functional rating scale score and its respiratory subscore (R-subscore) in order to determine the best parameter linked to early respiratory muscle weakness...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29767836/how-do-we-manage-iron-deficiency-after-blood-donation
#4
REVIEW
Joseph E Kiss, Ralph R Vassallo
Blood donors and the RBCs and other components they willingly provide are essential in the delivery of healthcare in all parts of the world. Nearly 70% of donated blood comes from repeat or committed donors. The amount of iron removed in the 10 min or so it takes to withdraw a unit of blood (500 ml, plus 25 ml for testing) requires over 24 weeks to replace on a "standard" diet, i.e., without added iron in the form of supplements The cumulative effect of repeat blood donations without adequate iron replacement or a longer wait between donations results in iron deficiency (ID) in many donors, low haemoglobin deferral (~8% of donation attempts), and frank anaemia in some...
May 16, 2018: British Journal of Haematology
https://www.readbyqxmd.com/read/29755590/wide-pulse-high-frequency-low-intensity-neuromuscular-electrical-stimulation-has-potential-for-targeted-strengthening-of-an-intrinsic-foot-muscle-a-feasibility-study
#5
Darren C James, Matthew C Solan, Katya N Mileva
Background: Strengthening the intrinsic foot muscles is a poorly understood and largely overlooked area. In this study, we explore the feasibility of strengthening m . abductor hallucis (AH) with a specific paradigm of neuromuscular electrical stimulation; one which is low-intensity in nature and designed to interleave physiologically-relevant low frequency stimulation with high-frequencies to enhance effective current delivery to spinal motoneurones, and enable a proportion of force produced by the target muscle to be generated from a central origin...
2018: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/29754195/three-different-motor-task-strategies-to-assess-neuromuscular-adjustments-during-fatiguing-muscle-contractions-in-young-and-older-men
#6
Laura Kyguoliene, Albertas Skurvydas, Nerijus Eimantas, Neringa Baranauskiene, Rasa Steponaviciute, Laura Daniuseviciute, Henrikas Paulauskas, Margarita Cernych, Marius Brazaitis
Healthy aging is associated with a marked decline in motor performance. The functional consequences of applying varying novel or unexpected motor stimuli during intermittent isometric prolonged (fatiguing) motor tasks for lower limb neuromuscular fatigability and steadiness, perception of effort, and blood markers of stress in healthy aged men compared with young men have not been investigated. The participants in this study were 15 young men (aged 22 ± 4 years) and 10 older men (aged 67 ± 6 years)...
May 12, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29746792/the-modulation-of-corticospinal-excitability-and-inhibition-following-acute-resistance-exercise-in-males-and-females
#7
Christopher Latella, Ashlee Hendy, Dan Vanderwesthuizen, Wei-Peng Teo
OBJECTIVE: The acute responses to resistance training (RT) between males and females are poorly understood, especially from a neural perspective. Therefore, we aimed to compare the corticospinal and intracortical responses during fatigue and recovery following RT. METHODS: Twenty-two participants (12M, 10F) completed one-session of RT (3 × 12 repetition maximum) unilateral leg extensions with 60 s recovery. Single- and paired-pulse transcranial magnetic stimulation measured changes in the motor-evoked potential (MEP), corticospinal silent period (CSP), CSP/MEP ratio, and intracortical facilitation/inhibition (ICF, SICI)...
May 10, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29742747/improving-the-signal-to-noise-ratio-when-monitoring-countermovement-jump-performance
#8
Rodney A Kennedy, David Drake
Kennedy, RA and Drake, D. Improving the signal-to-noise ratio when monitoring countermovement jump performance. J Strength Cond Res XX(X): 000-000, 2018-Countermovement jump (CMJ) performance has been routinely used to monitor neuromuscular status. However, the protocol used to establish the criterion score is not well documented. The purpose of this study was to examine how the protocol used would influence of the sensitivity of CMJ variables in rugby union players. Fifteen male (age: 19.7 ± 0.5 years) rugby union players performed 8 CMJs on 2 occasions, separated by 7 days...
May 8, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29726694/the-role-of-the-nervous-system-in-neuromuscular-fatigue-induced-by-ultra-endurance-exercise
#9
Guillaume Y Millet, Vincent Martin, John Temesi
Ultra-endurance events are not a recent development but they have only become very popular in the last two decades, particularly ultra-marathons run on trails. The present paper reviews the role of the central nervous system (CNS) in neuromuscular fatigue induced by ultra-endurance exercise. Large decreases in voluntary activation are systematically found in ultra-endurance running but are attenuated in ultra-endurance cycling for comparable intensity and duration. This indirectly suggests that afferent feedback, rather than neurobiological changes within the CNS, is determinant in the amount of central fatigue produced...
May 4, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29721605/estimation-of-critical-end-test-torque-using-neuromuscular-electrical-stimulation-of-the-quadriceps-in-humans
#10
Natalie R Janzen, Robert E Hight, Darshit S Patel, Jason A Campbell, Rebecca D Larson, Christopher D Black
Characterization of critical power/torque (CP/CT) during voluntary exercise requires maximal effort, making difficult for those with neuromuscular impairments. To address this issue we sought to determine if electrically stimulated intermittent isometric exercise resulted in a critical end-test torque (ETT) that behaved similar to voluntary CT. In the first experiment participants (n = 9) completed four bouts of stimulated exercise at a 3:2 duty cycle, at frequencies of 100, 50, 25 Hz, and a low frequency below ETT (Sub-ETT; ≤ 15 Hz)...
May 2, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29719079/effects-of-ipsilateral-and-contralateral-fatigue-and-muscle-blood-flow-occlusion-on-the-complexity-of-knee-extensor-torque-output-in-humans
#11
Jamie Pethick, Samantha L Winter, Mark Burnley
NEW FINDINGS: In this study we show that the fatigue-induced loss of isometric torque complexity does not recover if the fatigued muscle's blood flow is occluded during recovery, suggesting a pivotal role for peripheral mechanisms in this effect. When the contralateral limb is fatigued, the complexity of isometric torque output is unaffected even if the contralateral limb's blood flow is occluded, which suggests neither central fatigue nor afferent feedback from ischaemic muscle influence the complexity of torque output in an otherwise fresh muscle...
May 2, 2018: Experimental Physiology
https://www.readbyqxmd.com/read/29718968/acute-attenuation-of-fatigue-after-sodium-bicarbonate-supplementation-does-not-manifest-into-greater-training-adaptations-after-10-weeks-of-resistance-training-exercise
#12
Jason C Siegler, Paul W M Marshall, Harrison Finn, Rebecca Cross, Kurt Mudie
PURPOSE: In two concurrent studies, we aimed to a) confirm the acute effect of 0.3 g·kg-1 body weight (BW) sodium bicarbonate (NaHCO3) supplementation on central and peripheral mechanisms associated with explosive power (Study 1) and b) determine whether chronic NaHCO3 supplementation would improve the adaptive response of the neuromuscular system during a 10-week resistance training program (Study 2). METHODS: Eight resistance trained participants volunteered after providing written consent...
2018: PloS One
https://www.readbyqxmd.com/read/29706347/the-effect-of-actn3-gene-doping-on-skeletal-muscle-performance
#13
Fleur C Garton, Peter J Houweling, Damjan Vukcevic, Lyra R Meehan, Fiona X Z Lee, Monkol Lek, Kelly N Roeszler, Marshall W Hogarth, Chrystal F Tiong, Diana Zannino, Nan Yang, Stephen Leslie, Paul Gregorevic, Stewart I Head, Jane T Seto, Kathryn N North
Loss of expression of ACTN3, due to homozygosity of the common null polymorphism (p.Arg577X), is underrepresented in elite sprint/power athletes and has been associated with reduced muscle mass and strength in humans and mice. To investigate ACTN3 gene dosage in performance and whether expression could enhance muscle force, we performed meta-analysis and expression studies. Our general meta-analysis using a Bayesian random effects model in elite sprint/power athlete cohorts demonstrated a consistent homozygous-group effect across studies (per allele OR = 1...
April 18, 2018: American Journal of Human Genetics
https://www.readbyqxmd.com/read/29705497/presynaptic-inhibition-mechanisms-may-subserve-the-spinal-excitability-modulation-induced-by-neuromuscular-electrical-stimulation
#14
Sidney Grosprêtre, Nicolas Gueugneau, Alain Martin, Romuald Lepers
This study aimed at deciphering the origins of spinal excitability modulation that follows neuromuscular electrical stimulation (NMES). Ten participants (age: 24.6 ± 4.2 years) performed 2 randomized NMES sessions on plantar flexors with frequencies of stimulations of 20 or 100 Hz (pulse width: 1 ms) at 20% of maximal voluntary contraction (MVC). Before and after each session, the posterior tibial nerve was stimulated to record H-reflex of soleus (SOL), gastrocnemius medialis (GM) and gastrocnemius lateralis (GL)...
April 24, 2018: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29705166/differences-in-knee-and-hip-adduction-and-hip-muscle-activation-in-runners-with-and-without-iliotibial-band-syndrome
#15
Robert L Baker, Richard B Souza, Mitchell J Rauh, Michael Fredericson, Michael D Rosenthal
BACKGROUND: Iliotibial Band Syndrome has been associated with altered hip and knee kinematics in runners. Prior studies have recommended further research on neuromuscular factors at the hip. The frontal plane hip muscles have been a strong focus in strength comparison, but not for electromyography investigation. OBJECTIVE: To compare hip surface electromyography, and frontal plane hip and knee kinematics, in runners with and without iliotibial band syndrome. DESIGN: Observational cross sectional study, 30 participants were tested for motion capture at the hip and knee and muscle activation in the lateral and posterior hip...
April 26, 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/29701482/neuromuscular-fatigue-during-repeated-sprint-exercise-underlying-physiology-and-methodological-considerations
#16
Brandon W Collins, Gregory Ep Pearcey, Natasha C M Buckle, Kevin E Power, Duane C Button
Neuromuscular fatigue occurs when an individual's capacity to produce force or power is impaired. Repeated sprint exercise requires an individual to physically exert themselves at near-maximal to maximal capacity for multiple short duration bouts, is extremely taxing on the neuromuscular system and consequently leads to the rapid development of neuromuscular fatigue. During repeated sprint exercise the development of neuromuscular fatigue is underlined by a combination of central and peripheral fatigue. However, there are a number of methodological considerations that complicate the quantification of the development of neuromuscular fatigue...
April 27, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29687898/neuromuscular-fatigue-after-low-and-medium-frequency-electrical-stimulation-in-healthy-adults
#17
Pedro Ferreira Alves de Oliveira, João Luiz Quagliotti Durigan, Karenina Arrais Guida Modesto, Martim Bottaro, Nicolas Babault
INTRODUCTION: We studied fatigue origins induced by low-frequency pulsed current (PC) and medium frequency current (MF) neuromuscular electrical stimulation (NMES) after a clinical-like session. METHODS: Eleven healthy men randomly underwent 2 NMES sessions, PC and MF, on quadriceps muscle (15-min duration, 6-s on and 18-s off). Maximal voluntary contraction (MVC), central activation ratio (CAR), vastus lateralis electromyographic activity (EMG) and evoked contractile properties were determined before and after sessions...
April 17, 2018: Muscle & Nerve
https://www.readbyqxmd.com/read/29684047/effect-of-hypnotic-suggestion-on-knee-extensor-neuromuscular-properties-in-resting-and-fatigued-states
#18
Naiandra Dittrich, Daniel Agostino, Roberta Antonini Philippe, Luiz Guilherme A Guglielmo, Nicolas Place
PURPOSE: The aim of this study was to investigate whether hypnotic suggestions can alter knee extensor neuromuscular function at rest and during exercise. METHODS: Thirteen healthy volunteers (8 men and 5 women, 27 ± 3 years old) took part in this counterbalanced, crossover study including two experimental (hypnosis and control) sessions. Knee extensor neuromuscular function was tested before and after hypnosis suggestion by using a combination of voluntary contraction, transcutaneous femoral nerve electrical stimulation and transcranial magnetic stimulation (TMS)...
2018: PloS One
https://www.readbyqxmd.com/read/29682216/physical-training-interventions-for-children-and-teenagers-affected-by-acute-lymphoblastic-leukemia-and-related-treatment-impairments
#19
REVIEW
Carolina Simioni, Giorgio Zauli, Alberto M Martelli, Marco Vitale, Simona Ultimo, Daniela Milani, Luca M Neri
A decreased physical fitness has been reported in patients and survivors of acute lymphoblastic leukemia (ALL). This is influenced by the negative effects of the disease and by the treatments of childhood cancer. In the past, children were advised to recover in bed, and to take as much relax as possible. Nowadays, it is considered that too much immobility may result in a further decrease of physical fitness and functioning. Exercise training for ALL children has frequently been reported to improve physical fitness and the well-being of the children, since it prevents the negative effects of a sedentary life-style, such as obesity and a poor skeletal health...
March 30, 2018: Oncotarget
https://www.readbyqxmd.com/read/29670481/exercise-associated-muscle-cramp-doubts-about-the-cause
#20
Dzenan Jahic, Edin Begic
Introduction: Exercise-associated muscle cramp (EAMC) is one of the most common conditions that occur during or immediately after the exercise, with questionable etiology. Aim: Aim of article was to present doubts about the cause of EAMC, whether it is primarily a neurological condition or it is water and salt imbalance. Results: Strongest evidence supports the neuromuscular aetiology with the focus on the muscle fatigue. Muscle overload and fatigue affects the balance between the excitatory drive from muscle spindles and the inhibitory drive from the Golgi tendon organs (GTO)...
March 2018: Materia Socio-medica
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