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Muscle fatigue and recovery

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https://www.readbyqxmd.com/read/28513880/unstable-rocker-shoes-promote-recovery-from-marathon-induced-muscle-damage-in-novice-runners
#1
Kento Nakagawa, Takayuki Inami, Takahisa Yonezu, Yuta Kenmotsu, Takaya Narita, Yasuo Kawakami, Kazuyuki Kanosue
We recently reported that wearing unstable rocker shoes (Masai Barefoot Technology: MBT) may enhance recovery from marathon race induced fatigue. However, this earlier study only utilized a questionnaire. In the present study, we evaluated MBT utilizing objective physiological measures of recovery from marathon induced muscle damages. Twenty-five university student novice runners were divided into two groups. After running a full marathon, one group wore MBT shoes (MBT group), and the control group (CON) wore ordinary shoes daily for one week following the race...
May 17, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28490756/expressing-acetylcholine-receptors-after-innervation-suppresses-spontaneous-vesicle-release-and-causes-muscle-fatigue
#2
Meghan Mott, Victor M Luna, Jee-Young Park, Gerald B Downes, Kimberly Epley, Fumihito Ono
The formation and function of synapses are tightly orchestrated by the precise timing of expression of specific molecules during development. In this study, we determined how manipulating the timing of expression of postsynaptic acetylcholine receptors (AChRs) impacts presynaptic release by establishing a genetically engineered zebrafish line in which we can freely control the timing of AChR expression in an AChR-less fish background. With the delayed induction of AChR expression after an extensive period of AChR-less development, paralyzed fish displayed a remarkable level of recovery, exhibiting a robust escape response following developmental delay...
May 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28464800/effect-of-tendon-vibration-during-wide-pulse-neuromuscular-electrical-stimulation-nmes-on-the-decline-and-recovery-of-muscle-force
#3
Vanesa Bochkezanian, Robert U Newton, Gabriel S Trajano, Amilton Vieira, Timothy S Pulverenti, Anthony J Blazevich
BACKGROUND: Neuromuscular electrical stimulation (NMES) is commonly used to activate skeletal muscles and reverse muscle atrophy in clinical populations. Clinical recommendations for NMES suggest the use of short pulse widths (100-200 μs) and low-to-moderate pulse frequencies (30-50 Hz). However, this type of NMES causes rapid muscle fatigue due to the (non-physiological) high stimulation intensities and non-orderly recruitment of motor units. The use of both wide pulse widths (1000 μs) and tendon vibration might optimize motor unit activation through spinal reflex pathways and thus delay the onset of muscle fatigue, increasing muscle force and mass...
May 2, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28452288/25-oh-d-levels-in-trained-versus-sedentary-university-students-at-64%C3%A2-north
#4
Scott P Jerome, Kendra D Sticka, Theresia M Schnurr, Sally J Mangum, Arleigh J Reynolds, Kriya L Dunlap
PURPOSE: 25-hydroxyvitamin D (25[OH]D) deficiency is associated with compromised bone mineralisation, fatigue, suppressed immune function and unsatisfactory skeletal muscle recovery. We investigated the risk of 25(OH)D insufficiency or deficiency in endurance athletes compared to sedentary non-athletes living at 64° north. METHODS: University student-athletes (TS) and sedentary students (SS) volunteered to participate in this study. TS engaged in regular exercise while SS exercised no more than 20 minutes/week...
2017: International Journal of Circumpolar Health
https://www.readbyqxmd.com/read/28438761/improved-skeletal-muscle-ca-2-regulation-in-vivo-following-contractions-in-mice-overexpressing-pgc-1%C3%AE
#5
Hiroaki Eshima, Shinji Miura, Nanami Senoo, Koji Hatakeyama, David C Poole, Yutaka Kano
In skeletal muscle, resting intracellular Ca(2+) concentration ([Ca(2+)]i) homeostasis is exquisitely regulated by Ca(2+) transport across the sarcolemmal, mitochondrial and sarcoplasmic reticulum (SR) membranes. Of these three systems, the relative importance of the mitochondria in [Ca(2+)]i regulation remains poorly understood in in vivo skeletal muscle. We tested the hypothesis that the capacity for Ca(2+) uptake by mitochondria is a primary factor in determining [Ca(2+)]i regulation in muscle at rest and following contractions...
April 24, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28422523/can-the-lamberts-submaximal-cycle-test-reflect-overreaching-in-professional-cyclists
#6
Lieselot Decroix, Robert P Lamberts, Romain Meeusen
PURPOSE: The Lamberts and Lambert Submaximal Cycle Test (LSCT) consists of 3 stages during which cyclist's cycle for 6 minutes at 60%, 6 minutes at 80% and 3 minutes at 90% of their maximal heart rate, followed by one-minute recovery. It was the aim of this study to determine if the LSCT is able to reflect a state of functional overreaching in professional female cyclists during an 8-day training camp and the following recovery days. METHODS: Six professional female cyclists performed an LSCT on day 1, day 5 and day 8 of the training camp and 3 days after the training camp...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28410831/feasibility-and-efficacy-of-presurgical-exercise-in-survivors-of-rectal-cancer-scheduled-to-receive-curative-resection
#7
Favil Singh, Robert U Newton, Michael K Baker, Nigel A Spry, Dennis R Taaffe, Daniel A Galvão
BACKGROUND: Localized rectal carcinoma is invasive, with surgical resection the standard treatment. The aim of this study was to determine the feasibility of a supervised presurgical exercise intervention in patients with rectal cancer prior to rectal resection. PATIENTS AND METHODS: Twelve patients volunteered to undertake twice-weekly aerobic and resistance exercise for ∼16 weeks prior to surgery. At baseline, presurgery, and ∼8 weeks postsurgery, muscle strength and physical performance, body composition, quality of life, and fatigue were assessed...
March 21, 2017: Clinical Colorectal Cancer
https://www.readbyqxmd.com/read/28408696/assessment-of-tongue-mechanical-properties-using-different-contraction-tasks
#8
Wen-Yang Li, Simon Gakwaya, Didier Saey, Frédéric Sériès
Inadequate UA dilator muscle function may play an important role in the pathophysiology of obstructive sleep apnea (OSA). To date, tongue mechanical properties have been mainly assessed using protrusion protocol with conflicting results, while performance during elevation task among patients with OSA remains unknown. This study was aimed to assess tongue muscle strength, strength stability, endurance time, fatigue indices and muscle total work, using elevation and protrusion tasks with repetitive isometric fatiguing contractions during awake in 12 normal+mild, 17 moderate and 11 severe patients with OSA, and to assess the influence of BMI and age...
April 13, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28373911/feasibility-of-high-intensity-interval-training-and-moderate-intensity-continuous-training-in-adults-with-inactive-or-mildly-active-crohn-s-disease-study-protocol-for-a-randomised-controlled-trial
#9
Garry A Tew, Roger Carpenter, Michael Seed, Simon Anderson, Louise Langmead, Caroline Fairhurst, Lindsay Bottoms
BACKGROUND: Structured exercise training has been proposed as a useful adjunctive therapy for Crohn's disease by improving immune function and psychological health, reducing fatigue and promoting gains in muscle and bone strength. However, the evidence for exercise in Crohn's disease is sparse, with only a handful of small prospective trials [1, 2], with methodological limitations, including the use of non-randomised and non-controlled study designs and small sample sizes. Here, we describe the protocol for a study that aims to assess the feasibility and acceptability of two common types of exercise training-high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT)-in adults with inactive or mildly active Crohn's disease (CD)...
2017: Pilot and Feasibility Studies
https://www.readbyqxmd.com/read/28368955/combined-carbohydrate-and-protein-ingestion-during-australian-rules-football-matches-and-training-sessions-does-not-reduce-fatigue-or-accelerate-recovery-throughout-a-week-long-junior-tournament
#10
Nathan A Lee, James W Fell, Nathan W Pitchford, Andrew H Hall, Michael D Leveritt, Cecilia M Kitic
Australian Rules football (ARF) is a physically demanding sport that can induce high levels of fatigue. Fatigue may be intensified during periods where multiple matches are played with limited recovery time. Combined carbohydrate and protein (CHO+PRO) intake during physical activity may provide performance and recovery benefits. The aim of this study was to investigate whether CHO+PRO ingestion during ARF matches and training sessions throughout a tournament would enhance performance or recovery in comparison to CHO-only ingestion...
March 31, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28344736/recovery-of-hip-and-back-muscle-fatigue-following-a-back-extension-endurance-test
#11
Sharon Wang-Price, Mohammad Almadan, Carissa Stoddard, Dustin Moore
Literature has not shown the minimum time required to recover from muscle fatigue after a prolonged trunk isometric contraction. The purpose of this study was to determine if the lumbar multifidus (LM) and gluteus maximus (GM) muscles would recover from fatigue after three different rest periods following performance of a back extension endurance test. Endurance time and electromyographic (EMG) activity of bilateral LM and GM muscles were collected from 12 healthy adults during a modified Biering-Sørensen test...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28332714/phosphate-increase-during-fatigue-affects-crossbridge-kinetics-in-intact-mouse-muscle-at-physiological-temperature
#12
M Nocella, G Cecchi, B Colombini
KEY POINTS: Actomyosin ATP hydrolysis occurring during muscle contraction releases inorganic phosphate [Pi ] in the myoplasm. High [Pi ] reduces force and affects force kinetics in skinned muscle fibres at low temperature. These effects decrease at high temperature, raising the question of their importance under physiological conditions. This study provides the first analysis of the effects of Pi on muscle performance in intact mammalian fibres at physiological temperature. Myoplasmic [Pi ] was raised by fatiguing the fibres with a series of tetanic contractions...
March 23, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28332113/the-critical-power-concept-applications-to-sports-performance-with-a-focus-on-intermittent-high-intensity-exercise
#13
REVIEW
Andrew M Jones, Anni Vanhatalo
The curvilinear relationship between power output and the time for which it can be sustained is a fundamental and well-known feature of high-intensity exercise performance. This relationship 'levels off' at a 'critical power' (CP) that separates power outputs that can be sustained with stable values of, for example, muscle phosphocreatine, blood lactate, and pulmonary oxygen uptake ([Formula: see text]), from power outputs where these variables change continuously with time until their respective minimum and maximum values are reached and exercise intolerance occurs...
March 2017: Sports Medicine
https://www.readbyqxmd.com/read/28324999/surface-electromyography-based-muscle-fatigue-analysis-for-stroke-patients-at-different-brunnstrom-stages
#14
Yinjun Tu, Zhe Zhang, Xudong Gu, Qiang Fang
Muscle fatigue analysis has been an important topic in sport and rehabilitation medicine due to its role in muscle performance evaluation and pathology investigation. This paper proposes a surface electromyography (sEMG) based muscle fatigue analysis approach which was specifically designed for stroke rehabilitation applications. 14 stroke patients from 5 different Brunnstrom recovery stage groups were involved in the experiment and features including median frequency and mean power frequency were extracted from the collected sEMG samples for investigation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324618/thermogelling-chitosan-lactate-hydrogel-improves-functional-recovery-after-a-c2-spinal-cord-hemisection-in-rat
#15
Katarzyna Nawrotek, Tanguy Marqueste, Zofia Modrzejewska, Roman Zarzycki, Agnieszka Rusak, Patrick Decherchi
The present study was designed to provide an appropriate micro-environment for regenerating axotomized neurons and proliferating/migrating cells. Because of its intrinsic permissive properties, biocompatibility and biodegradability, we chose to evaluate the therapeutic effectiveness of a chitosan-based biopolymer. The biomaterial toxicity was measured through in vitro test based on fibroblast cell survival on thermogelling chitosan lactate hydrogel substrate and then polymer was implanted into a C2 hemisection of the rat spinal cord...
March 21, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28319585/increased-fatigue-response-to-augmented-deceptive-feedback-during-cycling-time-trial
#16
Guillaume P Ducrocq, Thomas J Hureau, Olivier Meste, Grégory M Blain
PURPOSE: This study aimed to investigate the effect of different magnitudes of deception on performance and exercise-induced fatigue during cycling time-trial. METHODS: Following three familiarization visits, three females and eight males performed three 5 km cycling time-trials while following a simulated dynamic avatar reproducing either 100% (5K100%), 102% (5K102%) or 105% (5K105%) of the subject's previous fastest trial. Quadriceps muscle activation was quantified with surface electromyography...
March 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28292763/oxygen-delivery-and-the-restoration-of-the-muscle-energetic-balance-following-exercise-implications-for-delayed-muscle-recovery-in-patients-with-copd
#17
Gwenael Layec, Corey R Hart, Joel D Trinity, Oh-Sung Kwon, Matthew J Rossman, Ryan M Broxterman, Yann Le Fur, Eun-Kee Jeong, Russell S Richardson
Patients with chronic obstructive pulmonary disease (COPD) experience a delayed recovery from skeletal muscle fatigue following exhaustive exercise that likely contributes to their progressive loss of mobility. As this phenomenon is not well understood, this study sought to examine post-exercise peripheral oxygen (O2) transport and muscle metabolism dynamics in patients with COPD, two important determinants of muscle recovery. Twenty four subjects, 12 non-hypoxemic patients with COPD and 12 healthy subjects with a sedentary lifestyle, performed dynamic plantar flexion exercise at 40% of maximal work rate (WRmax) with phosphorus magnetic resonance spectroscopy ((31)P-MRS), near-infrared spectroscopy (NIRS), and vascular Doppler ultrasound assessments...
March 14, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28274276/treatment-with-l-citrulline-in-patients-with-post-polio-syndrome-study-protocol-for-a-single-center-randomised-placebo-controlled-double-blind-trial
#18
Simone Schmidt, Vanya Gocheva, Thomas Zumbrunn, Daniela Rubino-Nacht, Ulrike Bonati, Dirk Fischer, Patricia Hafner
BACKGROUND: Post-polio syndrome (PPS) is a condition that affects polio survivors years after recovery from an initial acute infection by the Poliomyelitis virus. Most often, patients who suffered from polio start to experience gradual new weakening in muscles, a gradual decrease in the size of muscles (muscle atrophy) and fatigue years after the acute illness. L-citrulline is known to change muscular metabolism synthesis by raising nitric oxide (NO) levels and increasing protein synthesis...
March 9, 2017: Trials
https://www.readbyqxmd.com/read/28254758/role-of-mct1-and-caii-in-skeletal-muscle-ph-homeostasis-energetics-and-function-in-vivo-insights-from-mct1-haploinsufficient-mice
#19
Benjamin Chatel, David Bendahan, Christophe Hourdé, Luc Pellerin, Sylvain Lengacher, Pierre Magistretti, Yann Le Fur, Christophe Vilmen, Monique Bernard, Laurent A Messonnier
The purpose of this study was to investigate the effects of a partial suppression of monocarboxylate transporter (MCT)-1 on skeletal muscle pH, energetics, and function (MCT1(+/-) mice). Twenty-four MCT1(+/-) and 13 wild-type (WT) mice were subjected to a rest-exercise-recovery protocol, allowing assessment of muscle energetics (by magnetic resonance spectroscopy) and function. The study included analysis of enzyme activities and content of protein involved in pH regulation. Skeletal muscle of MCT1(+/-) mice had lower MCT1 (-61%; P < 0...
March 2, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28240708/movement-patterns-and-muscle-damage-during-simulated-rugby-sevens-matches-in-national-team-players
#20
Lucas A Pereira, Fábio Y Nakamura, José E Moraes, Katia Kitamura, Solange P Ramos, Irineu Loturco
The aim of this study was to analyze the match performance (i.e., distance covered in different intensities), signs of muscle damage (assessed by means of creatine kinase [CK] activity and rate of force development [RFD]), and neuromuscular fatigue (using linear sprint and vertical jump performances) following three single-day simulated matches performed by rugby sevens players from the Brazilian National Team. Ten male rugby sevens players (25.2 ± 3.6 years; 88.7 ± 7.1 kg; 182.2 ± 6.3 cm) participated in this study...
February 23, 2017: Journal of Strength and Conditioning Research
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