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Neuromuscular fatigue exercise

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
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
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
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...
September 17, 2016: Lasers in Medical Science
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
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
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
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
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
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
Younghye Moon, Jordan E Balke, Derik Madorma, Michael P Siegel, Gary Knowels, Peter Brouckaert, Emmanuel S Buys, David J Marcinek, Justin M Percival
AIM: Skeletal muscle nitric oxide-cyclic guanosine monophosphate (NO-cGMP) pathways are impaired in Duchenne and Becker muscular dystrophy partly because of reduced nNOSμ and soluble guanylate cyclase (GC) activity. However, GC function and the consequences of reduced GC activity in skeletal muscle are unknown. In this study, we explore the functions of GC and NO-cGMP signaling in skeletal muscle. RESULTS: GC1, but not GC2, expression was higher in oxidative than glycolytic muscles...
August 17, 2016: Antioxidants & Redox Signaling
Daniel E Lidstone, Herman van Werkhoven, Justin A Stewart, Reed Gurchiek, Madison Burris, Paige Rice, Garrett Feimster, Jeffrey M McBride
BACKGROUND: Previous literature has shown in vivo changes in muscle-tendon interaction during exhaustive stretch-shortening cycle (SSC) exercise. It is unclear whether these changes in muscle-tendon length during exhaustive SSC exercise are associated with changes in mechanical efficiency (ME). The purpose of the study was to investigate whether changes in platarflexor contractile component (CC) length, tendon length, and changes in plantarflexor muscle activity could explain reduction in ME during exhaustive SSC exercise...
October 2016: Journal of Electromyography and Kinesiology
Jérôme Nicolas Spring, Nicolas Place, Fabio Borrani, Bengt Kayser, Jérôme Barral
Exercise-induced fatigue affects the motor control and the ability to generate a given force or power. Surface electroencephalography allows researchers to investigate movement-related cortical potentials (MRCP), which reflect preparatory brain activity 1.5 s before movement onset. Although the MRCP amplitude appears to increase after repetitive single-joint contractions, the effects of large-muscle group dynamic exercise on such pre-motor potential remain to be described. Sixteen volunteers exercised 30 min at 60% of the maximal aerobic power on a cycle ergometer, followed by a 10-km all-out time trial...
2016: Frontiers in Human Neuroscience
Morufu Olusola Ibitoye, Nur Azah Hamzaid, Nazirah Hasnan, Ahmad Khairi Abdul Wahab, Md Anamul Islam, Victor S P Kean, Glen M Davis
The interaction between muscle contractions and joint loading produces torques necessary for movements during activities of daily living. However, during neuromuscular electrical stimulation (NMES)-evoked contractions in persons with spinal cord injury (SCI), a simple and reliable proxy of torque at the muscle level has been minimally investigated. Thus, the purpose of this study was to investigate the relationships between muscle mechanomyographic (MMG) characteristics and NMES-evoked isometric quadriceps torques in persons with motor complete SCI...
August 2016: Medical Engineering & Physics
Michael B Reid
INTRODUCTION: For over three decades, muscle biologists have been fascinated by reactive oxygen species (ROS) generated in exercising muscle and the potential role that ROS may play in fatigue. METHODS: Reports in the peer-reviewed literature were analyzed and published findings integrated to synthesize an overview of ROS as agents of fatigue. RESULTS: Muscle tissue contains multiple sources of ROS and specific ROS molecules have been detected in muscle including superoxide anions, hydrogen peroxide, and hydroxyl radicals...
June 9, 2016: Medicine and Science in Sports and Exercise
M Lehnert, M De Ste Croix, A Zaatar, J Hughes, R Varekova, O Lastovicka
Poor neuromuscular control has been proposed as a risk factor for non-contact injuries, thus this study aimed to explore the effects of soccer-specific fatigue on leg muscle activation, reactive strength, leg stiffness, and functional hamstring/quadriceps ratio (H/QFUNC ) in elite male youth soccer players. Outcome measures were determined in 18 youth players (age 14.4 ± 0.5 years; stature 169.4 ± 9.9 cm; mass 59.3 ± 8.9 kg; maturity offset 0.86 ± 0.88 years) pre and post simulated soccer match play (SAFT(90) )...
June 10, 2016: Scandinavian Journal of Medicine & Science in Sports
Spyridon Karras, Eleni Rapti, Stauros Matsoukas, Kalliopi Kotsa
Fibromyalgia (FM) is a chronic syndrome with an increasing prevalence, characterized by widespread musculoskeletal pain in combination with a variety of cognitive symptoms and fatigue. A plethora of scientific evidence that has accumulated during the last decades, resulted in a significant improvement of the understanding of the pathophysiology of the disease. However, current therapeutic approaches in patients with FM remains a multidimensional approach including patient education, behavioral therapy, exercise, pain management, and relief of chronic symptoms, rather than the use drug therapies, based on the mechanisms of disease development...
2016: Nutrients
Ric Lovell, Jason C Siegler, Michael Knox, Scott Brennan, Paul W M Marshall
The optimal scheduling of Nordic Hamstring exercises (NHEs) relative to football training sessions is unknown. We examined the acute neuromuscular and performance responses to NHE undertaken either before (BT) or after (AT) simulated football training. Twelve amateur players performed six sets of five repetitions of the NHE either before or after 60 min of standardised football-specific exercise (SAFT(60)). Surface electromyography signals (EMG) of the hamstring muscles were recorded during both the NHE, and maximum eccentric actions of the knee flexors (0...
June 6, 2016: Journal of Sports Sciences
Christopher Kuenze, Moataz Eltoukhy, Adam Kelly, Chang-Young Kim
OBJECTIVES: Patients commonly experience altered response to fatiguing exercise after ACL reconstruction (ACLR). The objective of this study was to assess the impact of quadriceps strengthening on response to exercise after ACLR. DESIGN: Clinical trial. METHODS: Ten participants with a history of primary, unilateral ACLR (sex=9F/1M, age=21.0±2.8 years, BMI=23.7±2.7kg/m(2)) and 10 healthy participants (sex=9F/1M, age=22.2±3.2 years, BMI=23...
May 21, 2016: Journal of Science and Medicine in Sport
Dennis Hamacher, Alexander Törpel, Daniel Hamacher, Lutz Schega
Fatigue directly affects key features of the sensorimotor system which disorganizes voluntary control of movement accuracy. Local dynamic stability of walking is considered a sensitive measure for neuromuscular performance. To gain greater insight in the role of fatigue in motor behaviour in older and young adults during walking, the current experiment analyses gait patterns of healthy young but maximal fatigued individuals and gait patterns in submaximal fatigued older adults. Ten young and 18 older subjects performed a bicycle incremental exercise test on a cycle ergometer...
July 2016: Gait & Posture
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