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Muscle fatigue and recovery

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https://www.readbyqxmd.com/read/29332237/acute-acetaminophen-ingestion-improves-performance-and-muscle-activation-during-maximal-intermittent-knee-extensor-exercise
#1
Paul T Morgan, Joanna L Bowtell, Anni Vanhatalo, Andrew M Jones, Stephen J Bailey
AIM: Acetaminophen is a commonly used medicine for pain relief and emerging evidence suggests that it may improve endurance exercise performance. This study investigated some of the physiological mechanisms by which acute acetaminophen ingestion might blunt muscle fatigue development. METHODS: Thirteen active males completed 60 × 3 s maximum voluntary contractions (MVC) of the knee extensors with each contraction separated by a 2 s passive recovery period...
January 13, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29318742/extracellular-water-excess-and-increased-self-reported-fatigue-in-chronic-hemodialysis-patients
#2
Kamonwan Tangvoraphonkchai, Andrew Davenport
Hemodialysis patients (HD) commonly report fatigue. Muscle wasting (sarcopenia) and extracellular water (ECW) excess have been reported to be associated with fatigue in other conditions. We wished to determine whether muscle loss and ECW excess were associated with fatigue in HD patients. Patients completed the Multidimensional Fatigue Inventory (MFI), Beck Depression Inventory-II (BDI-II), Patient Health Questionnaires (PHQ-9) and recorded their post-dialysis recovery time. Sessional dialysis data were recorded along with pre- and post-dialysis multi-frequency bioimpedance assessments (MFBIA)...
January 10, 2018: Therapeutic Apheresis and Dialysis
https://www.readbyqxmd.com/read/29297989/increased-temperature-accelerates-glycogen-synthesis-and-delays-fatigue-in-isolated-mouse-muscle-during-repeated-contractions
#3
Ester Hanya, Abram Katz
AIM: Elevated glycogen content in muscle delays fatigue during exercise. We examined if increasing muscle temperature during recovery from exercise affects glycogen synthesis and muscle performance during a subsequent bout of exercise. METHODS: Isolated mouse extensor digitorum longus muscles were stimulated electrically to perform repeated tetanic contractions until force decreased to 40% of initial at 25°C. Thereafter muscles recovered for 120 min at 25°C (control), 120 min at 35°C, or 60 min at 35°C followed by 60 min at 25°C...
January 3, 2018: Acta Physiologica
https://www.readbyqxmd.com/read/29283935/the-effects-of-sex-and-motoneuron-pool-on-central-fatigue
#4
Alexandra F Yacyshyn, Jane Nettleton, Chris J McNeil
PURPOSE: It is uncertain if sex influences central fatigue as the reduction in voluntary activation (VA) was not different between the sexes for elbow flexors (EFs) but greater in males compared to females for knee extensors. This disparity could result from the facilitatory and inhibitory effects of group III/IV muscle afferent effects on flexor vs. extensor motoneurons, respectively. The purpose of this study was to examine central fatigue and motoneuron responsiveness of EFs and elbow extensors (EEs) in males and females...
December 28, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29239993/hypoxia-during-resistance-exercise-does-not-affect-physical-performance-perceptual-responses-or-neuromuscular-recovery
#5
Brendan R Scott, Katie M Slattery, Dean V Sculley, Ben J Dascombe
This study aimed to determine whether performing resistance exercise in hypoxia affects markers of physical performance, perceptual responses, and neuromuscular function. Fourteen male subjects (age: 24.6 ± 2.7 yr; height: 179.7 ± 5.9 cm; body mass: 84.6 ± 11.6 kg) with >2 years resistance training experience performed moderate-load resistance exercise in two conditions; normoxia (FIO2 = 0.21) and hypoxia (FIO2 = 0.16). Resistance exercise comprised 3 sets of 10 repetitions of back squats and deadlifts at 60% of 1RM, with 60s inter-set rest...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29239984/profiling-inflammatory-markers-during-the-competitive-season-and-post-season-in-collegiate-wrestlers
#6
Joe Roth, Taylor Szczygiel, Mary Moore, Paul O'Connor, Jeffrey Edwards, Naveen Sharma, Ryan Pettit-Mee, Micah Zuhl
The purpose of this study was to determine if biological markers of muscle damage and inflammation coincide with subjective measures of muscle fatigue and sleep quality among Division I collegiate wrestlers. The goal was to provide practitioners with noninvasive techniques to evaluate a wrestlers inflammatory state. METHODS: Subjects from the Central Michigan University Division I collegiate wrestling team (n=6) were analyzed on six separate occasions throughout the course of the competitive season and post season...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29238254/assessment-of-three-dimensional-trunk-kinematics-and-muscle-activation-during-cycling-with-independent-cranks
#7
Eric Bourdon, Matthew Mavor, Dean C Hay
Independent cranks (IC) are recently introduced bicycle cranks that are decoupled; therefore allowing each leg to pedal independent of the other. Despite this introduction, limited research has been conducted assessing biomechanical changes when cycling with IC. Therefore, the purpose of this study was to evaluate and compare trunk kinematics and surface electromyography (sEMG) during IC and normal crank (NC) cycling during a graded exercise test to volitional fatigue. Ten healthy, physically active men performed two tests (IC and NC) on a cycling ergometer on separate days...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29236945/the-effect-of-increasing-age-on-the-concentric-and-eccentric-contractile-properties-of-isolated-mouse-soleus-and-extensor-digitorum-longus-muscles
#8
Cameron Hill, Rob S James, Val M Cox, Jason Tallis
There is currently a limited amount of literature investigating the age-related changes in eccentric muscle function in vitro. The present study uniquely uses the work loop technique, to better replicate in vivo muscle function, in the assessment of the age and muscle-specific changes in acute and sustained concentric and eccentric power and recovery. Whole soleus or EDL muscles were isolated from 10-week and 78-week old mice, and acute and sustained concentric and eccentric work loop power assessed. Despite an age-related increase in body and muscle mass, peak absolute power for both muscles was unaffected by age...
December 9, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/29225574/motor-unit-activity-during-fatiguing-isometric-muscle-contraction-in-hemispheric-stroke-survivors
#9
Lara McManus, Xiaogang Hu, William Z Rymer, Nina L Suresh, Madeleine M Lowery
Enhanced muscle weakness is commonly experienced following stroke and may be accompanied by increased susceptibility to fatigue. To examine the contributions of central and peripheral factors to isometric muscle fatigue in stroke survivors, this study investigates changes in motor unit (MU) mean firing rate, and action potential duration during, and directly following, a sustained submaximal fatiguing contraction at 30% maximum voluntary contraction (MVC). A series of short contractions of the first dorsal interosseous muscle were performed pre- and post-fatigue at 20% MVC, and again following a 10-min recovery period, by 12 chronic stroke survivors...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29215751/proteomic-response-of-the-rat-liver-in-differential-swimming-modes
#10
Liang Chen, Yanhua Yang, Yiting Wang, Lipeng Qiu, Hengchuan Xia, Aiai Wang, Hailong Liu, Hongfei Shi, Keping Chen
Moderate exercise helps improve competition results, providing a balanced muscle tone and biochemical activity, whereas excessive training disrupts the balance between training and recovery, causes harm to the organism, and leads to overtraining syndrome (OTS). To explore the mechanisms of different protein expressions during training and acquisition of immunity, we used proteomic analyses to investigate the differences of liver-protein expressions between two swimming modes. Sprague-Dawley rats were randomly divided into control (CT), fatigue training (FT), and exhaustive training (ET) groups, and liver tissues from each group were subjected to two-dimensional electrophoresis (2DE)...
December 7, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/29177980/cardiac-autonomic-responses-and-number-of-repetitions-maximum-after-led-irradiation-in-the-ipsilateral-and-contralateral-lower-limb
#11
Adalberto Ferreira Junior, Julio Cezar Schamne, Solange Marta Franzói de Moraes, Nilo Massaru Okuno
The aim of this study was to verify the maximum number of repetitions, fatigue index, blood lactate concentration ([Lac]), and cardiac autonomic responses after LED irradiation (LEDI) in the ipsilateral and contralateral limb. Twelve male subjects (22.0 ± 3.86 years; weight 82.94 ± 12.58 kg; height 1.77 ± 0.05 m), physically active, took part in this study. The subjects underwent a one repetition maximum (1RM) test and performed four randomly experimental sessions in the horizontal leg press exercise, which consisted in four sets of maximum repetitions at 80% of 1RM...
November 24, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29163473/treadmill-slope-modulates-inflammation-fiber-type-composition-androgen-and-glucocorticoid-receptors-in-the-skeletal-muscle-of-overtrained-mice
#12
Alisson L da Rocha, Bruno C Pereira, Giovana R Teixeira, Ana P Pinto, Fabiani G Frantz, Lucila L K Elias, Fábio S Lira, José R Pauli, Dennys E Cintra, Eduardo R Ropelle, Leandro P de Moura, Rania A Mekary, Ellen C de Freitas, Adelino S R da Silva
Overtraining (OT) may be defined as an imbalance between excessive training and adequate recovery period. Recently, a downhill running-based overtraining (OTR/down) protocol induced the nonfunctional overreaching state, which is defined as a performance decrement that may be associated with psychological and hormonal disruptions and promoted intramuscular and systemic inflammation. To discriminate the eccentric contraction effects on interleukin 1beta (IL-1β), IL-6, IL-10, IL-15, and SOCS-3, we compared the release of these cytokines in OTR/down with other two OT protocols with the same external load (i...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29163193/changes-in-muscle-and-cerebral-deoxygenation-and-perfusion-during-repeated-sprints-in-hypoxia-to-exhaustion
#13
Sarah J Willis, Laurent Alvarez, Grégoire P Millet, Fabio Borrani
During supramaximal exercise, exacerbated at exhaustion and in hypoxia, the circulatory system is challenged to facilitate oxygen delivery to working tissues through cerebral autoregulation which influences fatigue development and muscle performance. The aim of the study was to evaluate the effects of different levels of normobaric hypoxia on the changes in peripheral and cerebral oxygenation and performance during repeated sprints to exhaustion. Eleven recreationally active participants (six men and five women; 26...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29121507/the-effects-of-trunk-extensor-and-abdominal-muscle-fatigue-on-postural-control-and-trunk-proprioception-in-young-healthy-individuals
#14
Dennis J Larson, Stephen H M Brown
The purpose of this study was to induce both trunk extensor and abdominal muscle fatigue, on separate occasions, and compare their effects on standing postural control and trunk proprioception, as well as look at the effects of a recovery period on these outcome measures. A total of 20 individuals participated, with 10 (5 males and 5 females) completing either a standing postural control or lumbar axial repositioning protocol. Participants completed their randomly assigned protocol on two occasions, separated by at least 4  days, with either their trunk extensor or abdominal muscles being fatigued on either day...
November 6, 2017: Human Movement Science
https://www.readbyqxmd.com/read/29118716/etiology-and-recovery-of-neuromuscular-fatigue-following-competitive-soccer-match-play
#15
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/29112627/impact-of-blood-flow-restriction-exercise-on-muscle-fatigue-development-and-recovery
#16
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/29107662/methylphenidate-alters-brain-connectivity-after-enhanced-physical-performance
#17
Michael King, Keelyn Van Breda, Laurie H Rauch, Samantha J Brooks, Dan J Stein, Jonathan Ipser
Muscle fatigue is a disturbed homeostatic state characterized by a temporary inability to maintain force output and has lasting effects on the brain in the period immediately after exercise, such as decreased interhemispheric functional connectivity (FC). Stimulants that increase dopamine and norepinephrine neurotransmission can enhance performance during muscle fatiguing exercise (i.e. are ergogenic). We recently demonstrated that methylphenidate (MPH) increased force output and increased FC between the insular (IC) and hand motor cortex during a fatiguing handgrip task...
October 28, 2017: Brain Research
https://www.readbyqxmd.com/read/29099680/pre-exercise-infrared-photobiomodulation-therapy-810%C3%A2-nm-in-skeletal-muscle-performance-and-postexercise-recovery-in-humans-what-is-the-optimal-power-output
#18
Adriano Rodrigues de Oliveira, Adriane Aver Vanin, Shaiane Silva Tomazoni, Eduardo Foschini Miranda, Gianna Móes Albuquerque-Pontes, Thiago De Marchi, Vanessa Dos Santos Grandinetti, Paulo Roberto Vicente de Paiva, Treice Beatriz Gonçalves Imperatori, Paulo de Tarso Camillo de Carvalho, Jan Magnus Bjordal, Ernesto Cesar Pinto Leal-Junior
BACKGROUND: Photobiomodulation therapy (PBMT) has recently been used to alleviate postexercise muscle fatigue and enhance recovery, demonstrating positive results. A previous study by our research group demonstrated the optimal dose for an infrared wavelength (810 nm), but the outcomes could be optimized further with the determination of the optimal output power. OBJECTIVE: The aim of the present study was to evaluate the effects of PBMT (through low-level laser therapy) on postexercise skeletal muscle recovery and identify the best output power...
November 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29098658/acute-and-residual-soccer-match-related-fatigue-a-systematic-review-and-meta-analysis
#19
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/29079778/exercise-dependent-formation-of-new-junctions-that-promote-stim1-orai1-assembly-in-skeletal-muscle
#20
Simona Boncompagni, Antonio Michelucci, Laura Pietrangelo, Robert T Dirksen, Feliciano Protasi
Store-operated Ca(2+) entry (SOCE), a ubiquitous mechanism that allows recovery of Ca(2+) ions from the extracellular space, has been proposed to limit fatigue during repetitive skeletal muscle activity. However, the subcellular location for SOCE in muscle fibers has not been unequivocally identified. Here we show that exercise drives a significant remodeling of the sarcotubular system to form previously unidentified junctions between the sarcoplasmic reticulum (SR) and transverse-tubules (TTs). We also demonstrate that these new SR-TT junctions contain the molecular machinery that mediate SOCE: stromal interaction molecule-1 (STIM1), which functions as the SR Ca(2+) sensor, and Orai1, the Ca(2+)-permeable channel in the TT...
October 27, 2017: Scientific Reports
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