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Neuromuscular fatigue exercise

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https://www.readbyqxmd.com/read/27894796/cognitive-challenges-aging-and-neuromuscular-fatigue
#1
Ashley E Shortz, Ranjana K Mehta
Cognitive challenges, such as concurrent cognitive demands or prior cognitive fatigue, have shown to adversely impact neuromuscular fatigue, specifically in younger adults. Whether these relationships are similar for the aging population remains unclear. The aim of the study was to investigate the effects of different cognitive challenges on handgrip fatigue with aging. Ten younger (24.10 (1.79) years) and ten older (75.90 (7.80) years) females attended three experimental conditions (control, i.e., exercise only, cognitive fatigue prior to exercise, and concurrent mental arithmetic during exercise) on different days...
November 25, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27893475/leg-stiffness-in-female-soccer-players-inter-session-reliability-and-the-fatiguing-effects-of-soccer-specific-exercise
#2
Mark De Ste Croix, Jonathan Hughes, Rhodri S Lloyd, Jon L Oliver, Paul Read
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 following exposure to a soccer-specific fatigue protocol in young female soccer players. 37 uninjured female youth soccer players divided into 3 sub-groups based on chronological age (U13, U15 and U17 year olds) volunteered to participate in the study...
November 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27870606/the-application-of-cortical-arousal-assessment-to-control-neuromuscular-fatigue-during-strength-training
#3
Vicente Javier Clemente-Suárez
The author's aim was to analyze the cortical arousal response during a conventional strength training session as a method to assess central nervous system fatigue. Sixteen trained men were recruited to perform the maximum number of training series composed of 6 exercises of 10 repetition each, at the intensity of 70% of the 1 maximum repetition, with a rest period of 2 min between exercises and 5 min between series, until exhaustion. Cortical arousal was measured using the critical flicker fusion threshold before, after warm-up, after each exercises series, after the recovery phase between series, and 15 min and 30 min after finishing the training session...
November 21, 2016: Journal of Motor Behavior
https://www.readbyqxmd.com/read/27864638/effects-of-caffeine-on-neuromuscular-fatigue-and-performance-during-high-intensity-cycling%C3%A2-exercise-in-moderate-hypoxia
#4
Bruno P C Smirmaul, Antonio Carlos de Moraes, Luca Angius, Samuele M Marcora
PURPOSE: To investigate the effects of caffeine on performance, neuromuscular fatigue and perception of effort during high-intensity cycling exercise in moderate hypoxia. METHODS: Seven adult male participants firstly underwent an incremental exercise test on a cycle ergometer in conditions of acute normobaric hypoxia (fraction inspired oxygen = 0.15) to establish peak power output (PPO). In the following two visits, they performed a time to exhaustion test (78 ± 3% PPO) in the same hypoxic conditions after caffeine ingestion (4 mg kg(-1)) and one after placebo ingestion in a double-blind, randomized, counterbalanced cross-over design...
November 18, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27862023/fatigue-reduction-during-aggregated-and-distributed-sequential-stimulation
#5
Austin J Bergquist, Vishvek Babbar, Saima Ali, Milos R Popovic, Masani Kei
INTRODUCTION: Transcutaneous neuromuscular electrical stimulation (NMES) can generate muscle contractions for rehabilitation and exercise. However, NMES-evoked contractions are limited by fatigue when they are delivered "conventionally" (CONV) using a single active electrode. Researchers developed "sequential" (SEQ) stimulation, involving rotation of pulses between multiple "aggregated" (AGGR-SEQ) or "distributed" (DISTR-SEQ) active electrodes, to reduce fatigue (torque-decline) by reducing motor unit discharge rates...
November 11, 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/27856712/rates-of-performance-loss-and-neuromuscular-activity-in-men-and-women-during-cycling-evidence-for-a-common-metabolic-basis-of-muscle-fatigue
#6
Christopher W Sundberg, Sandra K Hunter, Matthew W Bundle
The durations that muscular force and power outputs can be sustained until failure fall predictably on an exponential decline between an individual's 3-s burst maximum to the maximum performance they can sustain aerobically. The exponential time constants describing these rates of performance loss are similar across individuals suggesting that a common metabolically-based mechanism governs muscle fatigue; however, these conclusions come from studies mainly on men. To test whether the same physiological understanding can be applied to women, we compared the performance-duration relationships and neuromuscular activity between 7 men (23...
November 17, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27846435/muscle-activation-patterns-of-the-lumbo-pelvic-hip-complex-during-walking-gait-before-and-after-exercise
#7
Mihyang Chang, Lindsay V Slater, Revay O Corbett, Joseph M Hart, Jay Hertel
The lumbo-pelvic-hip core complex consists of musculoskeletal structures that stabilize the spine and pelvis, however fatigue may affect muscle recruitment, active muscle stiffness and trunk kinematics, compromising trunk stability. The purpose of this study was to compare trunk muscle activation patterns, and trunk and lower extremity kinematics during walking gait before and after exercise. Surface electrodes were placed over the rectus abdominis, external oblique, erector spinae, gluteus medius, vastus lateralis, and vastus medialis of twenty-five healthy inidviduals...
November 9, 2016: Gait & Posture
https://www.readbyqxmd.com/read/27821022/the-sensory-tolerance-limit-a-hypothetical-construct-determining-exercise-performance
#8
Thomas J Hureau, Lee M Romer, Markus Amann
Neuromuscular fatigue compromises exercise performance and is determined by central and peripheral mechanisms. Interactions between the two components of fatigue can occur via neural pathways, including feedback and feedforward processes. This brief review discusses the influence of feedback and feedforward mechanisms on exercise limitation. In terms of feedback mechanisms, particular attention is given to group III/IV sensory neurons which link limb muscle with the central nervous system. Central corollary discharge, a copy of the neural drive from the brain to the working muscles, provides a signal from the motor system to sensory systems and is considered a feedforward mechanism that might influence fatigue and consequently exercise performance...
November 7, 2016: European Journal of Sport Science
https://www.readbyqxmd.com/read/27806677/power-duration-relationship-physiology-fatigue-and-the-limits-of-human-performance
#9
Mark Burnley, Andrew M Jones
The duration that exercise can be maintained decreases as the power requirements increase. In this review, we describe the power-duration (PD) relationship across the full range of attainable power outputs in humans. We show that a remarkably small range of power outputs is sustainable (power outputs below the critical power, CP). We also show that the origin of neuromuscular fatigue differs considerably depending on the exercise intensity domain in which exercise is performed. In the moderate domain (below the lactate threshold, LT), fatigue develops slowly and is predominantly of central origin (residing in the central nervous system)...
November 3, 2016: European Journal of Sport Science
https://www.readbyqxmd.com/read/27777059/metabolic-mechanisms-of-vocal-fatigue
#10
Chayadevie Nanjundeswaran, Jessie VanSwearingen, Katherine Verdolini Abbott
OBJECTIVE: This study aimed to identify potential metabolic mechanisms including (1) neuromuscular inefficiency, (2) cardiovascular recovery deficits, or (3) both, in individuals with complaints of vocal fatigue. STUDY DESIGN: Within- and between-subjects group design was used in this study. METHODS: Three groups of women participated in the study, including (1) individuals with complaints of vocal fatigue; (2) vocally healthy sedentary individuals; and (3) vocally healthy, cardiovascularly conditioned individuals...
October 21, 2016: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/27776001/central-factors-contribute-to-knee-extensor-strength-loss-after-2000-m-rowing-in-elite-male-and-female-rowers
#11
Florian Husmann, Martin Gube, Sabine Felser, Matthias Weippert, Anett Mau-Moeller, Sven Bruhn, Martin Behrens
PURPOSE: Despite growing interest in task-dependent alterations of central and peripheral fatigue following endurance exercise, little is known about the impact of rowing on quadriceps muscle fatigue. This study aimed to investigate central and peripheral mechanisms of fatigue following a 2000-m rowing time-trial. METHODS: Eight competitive rowers (4 males, 4 females, 20 ± 4 years) performed a 2000-m time-trial on an indoor rower and a control condition (sitting)...
October 21, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27753741/neuromuscular-fatigue-during-prolonged-exercise-in-hypoxia
#12
Marc Jubeau, Thomas Rupp, John Temesi, Stéphane Perrey, Bernard Wuyam, Guillaume Y Millet, Samuel Verges
PURPOSE: Prolonged cycling exercise performance in normoxia is limited due to both peripheral and central neuromuscular impairments. It has been reported that cerebral perturbations are greater during short-duration exercise in hypoxia compared to normoxia. The purpose of this study was to test the hypothesis that central deficits are accentuated in hypoxia compared to normoxia during prolonged (3 bouts of 80 min separated by 25 min) whole-body exercise at the same relative intensity...
October 6, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27714855/role-of-carbohydrate-in-central-fatigue-a-systematic-review
#13
T K Khong, V S Selvanayagam, S K Sidhu, A Yusof
Carbohydrate (CHO) depletion is linked to neuromuscular fatigue during exercise. While its role at peripheral level is relatively well understood, less is known about its impact centrally. The aim of this systematic review was to critically analyze the effects of CHO on central fatigue (CF) assessed by various neurophysiological techniques. Four databases were searched using PRISMA guidelines through February 2016. The inclusion criteria were: CHO as intervention against a placebo control, fatigue induced by prolonged exercise and assessed using neurophysiological measures [voluntary activation (VA), superimposed twitch (SIT), M-wave, electromyography], alongside maximal voluntary contraction (MVC)...
October 7, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27638148/low-level-laser-therapy-reduces-the-fatigue-index-in-the-ankle-plantar-flexors-of-healthy-subjects
#14
Clécio Gabriel de Souza, Daniel Tezoni Borges, Liane de Brito Macedo, Jamilson Simões Brasileiro
Low-level laser therapy (LLLT) has been suggested as a resource capable of increasing resistance to fatigue and enhancing muscle performance through its metabolic and photochemical effects. This study evaluated the immediate effects of the application of LLLT on neuromuscular performance of the plantar ankle flexors in healthy subjects through a fatigue-induced protocol. This is a randomized controlled clinical trial, attended by 60 young and physically active volunteers of both genders. The subjects were randomly assigned into three groups, control, placebo, and laser, and underwent a preliminary evaluation of the isokinetic performance of plantar flexors and electromyographic activity of the soleus muscle to ensure homogeneity between groups...
December 2016: Lasers in Medical Science
https://www.readbyqxmd.com/read/27584466/neuromuscular-fatigue-in-response-to-120-minutes-of-soccer-specific-exercise-2431-board-3-june-3-9-30-am-11-30-am
#15
Stuart Goodall, Kevin Thomas, Robert Hunter, Paul Parker, Gareth Woolley, Liam Harper, Emma Stevenson, Daniel West, Mark Russell, Glyn Howatson
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27529668/detecting-fatigue-thresholds-from-electromyographic-signals-a-systematic-review-on-approaches-and-methodologies
#16
REVIEW
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
https://www.readbyqxmd.com/read/27465625/theoretical-and-practical-aspects-of-different-cluster-set-structures-a-systematic-review
#17
James J Tufano, Lee E Brown, G Gregory Haff
When performing a set of successive repetitions, fatigue ensues and the quality of performance during subsequent repetitions contained in the set decreases. Oftentimes, this response may be beneficial, as fatigue may stimulate the neuromuscular system to adapt, resulting in a super-compensatory response. However, there are instances in which accumulated fatigue may be detrimental to training or performance adaptations (i.e. power development). In these instances, the ability to recover and maintain repetition performance would be considered essential...
July 25, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27456477/fatigue-associated-with-prolonged-graded-running
#18
REVIEW
Marlene Giandolini, Gianluca Vernillo, Pierre Samozino, Nicolas Horvais, W Brent Edwards, Jean-Benoît Morin, Guillaume Y Millet
Scientific experiments on running mainly consider level running. However, the magnitude and etiology of fatigue depend on the exercise under consideration, particularly the predominant type of contraction, which differs between level, uphill, and downhill running. The purpose of this review is to comprehensively summarize the neurophysiological and biomechanical changes due to fatigue in graded running. When comparing prolonged hilly running (i.e., a combination of uphill and downhill running) to level running, it is found that (1) the general shape of the neuromuscular fatigue-exercise duration curve as well as the etiology of fatigue in knee extensor and plantar flexor muscles are similar and (2) the biomechanical consequences are also relatively comparable, suggesting that duration rather than elevation changes affects neuromuscular function and running patterns...
October 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27440245/non-invasive-brain-stimulation-enhances-sustained-muscle-contractions-by-reducing-neuromuscular-fatigue-implications-for-rehabilitation
#19
David A Cunningham
Neuromuscular fatigue is due, in part, to central processes that involves failure of the nervous system to drive muscles maximally during exercise. A recent study by Abdelmoula and colleagues (Abdelmoula A, Baudry S and Duchateau J. Neuroscience 322 94-103, 2016) have shown that non-invasive brain stimulation can mitigate neuromuscular fatigue; however, does not rely on enhanced corticospinal excitability of the primary motor cortex. These findings are of high clinical importance as rehabilitative therapies are necessary to mitigate neuromuscular fatigue for patients with central nervous system disorders...
July 20, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/27434080/no-muscle-is-an-island-integrative-perspectives-on-muscle-fatigue
#20
Jane A Kent, Niels Ørtenblad, Michael C Hogan, David C Poole, Timothy I Musch
Muscle fatigue has been studied with a variety approaches, tools and technologies. The foci of these studies have ranged tremendously, from molecules to the entire organism. Single cell and animal models have been used to gain mechanistic insight into the fatigue process. The theme of this review is the concept that the mechanisms of muscle fatigue do not occur in isolation in vivo: muscular work is supported by many complex physiological systems, any of which could fail during exercise and thus contribute to fatigue...
November 2016: Medicine and Science in Sports and Exercise
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