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Muscle fatigue and recovery

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https://www.readbyqxmd.com/read/29786953/iatrogenic-botulism-outbreak-in-egypt-due-to-a-counterfeit-botulinum-toxin-a-preparation-a-descriptive-series-of-patient-features-and-outcome
#1
Eman Abdel Monaem Abdel Rashid, Nashwa Mohamed El-Mahdy, Huda Shehata Kharoub, Ahmed Salah Gouda, Naglaa Ahmed ElNabarawy, Bruno Mégarbane
Iatrogenic botulism resulting from the substantial increase in use of botulinum neurotoxin type-A (BoNT-A) treatment is rarely reported. We aimed to describe a large iatrogenic botulism outbreak in Egypt in June-July 2017. Nine patients developed botulism after receiving intramuscular injections of BoNT-A (dose: 200-300 IU) to treat cerebral palsy (N=7), spastic dystonia (N=1), and hyperhidrosis (N=1). Detailed findings were available in 5/9 cases. Patients were admitted to the hospital 5-10 days after the BoNT-A injection...
May 22, 2018: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/29758055/active-recovery-affects-the-recovery-of-the-corticospinal-system-but-not-of-muscle-contractile-properties
#2
Louis-Solal Giboin, Ehsan Amiri, Raphael Bertschinger, Markus Gruber
PURPOSE: Active recovery is often used by athletes after strenuous exercise or competition but its underlying mechanisms are not well understood. We hypothesized that active recovery speeds-up recovery processes within the muscle and the central nervous system (CNS). METHODS: We assessed muscular and CNS recovery by measuring the voluntary activation (VA) in the vastus lateralis muscle with transcranial magnetic stimulation (VATMS) and peripheral nerve stimulation (VAPNS) during maximal voluntary contractions (MVC) of the knee extensors in 11 subjects...
2018: PloS One
https://www.readbyqxmd.com/read/29755363/an-evidence-based-approach-for-choosing-post-exercise-recovery-techniques-to-reduce-markers-of-muscle-damage-soreness-fatigue-and-inflammation-a-systematic-review-with-meta-analysis
#3
Olivier Dupuy, Wafa Douzi, Dimitri Theurot, Laurent Bosquet, Benoit Dugué
Introduction: The aim of the present work was to perform a meta-analysis evaluating the impact of recovery techniques on delayed onset muscle soreness (DOMS), perceived fatigue, muscle damage, and inflammatory markers after physical exercise. Method: Three databases including PubMed, Embase , and Web-of-Science were searched using the following terms: ("recovery" or "active recovery" or "cooling" or "massage" or "compression garment" or "electrostimulation" or "stretching" or "immersion" or "cryotherapy") and ("DOMS" or "perceived fatigue" or "CK" or "CRP" or "IL-6") and ("after exercise" or "post-exercise") for randomized controlled trials, crossover trials, and repeated-measure studies...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29754983/cognitive-impairment-in-intensive-care-unit-patients-a-pilot-mixed-methods-feasibility-study-exploring-incidence-and-experiences-for-recovering-patients
#4
Rosalind Elliott, Elizabeth Yarad, Sarah Webb, Katherine Cheung, Frances Bass, Naomi Hammond, Doug Elliott
BACKGROUND: Despite improvements in survival after critical illness and intensive care unit (ICU) treatment, some recovering patients still face ongoing challenges. There are few investigations exploring the incidence, risk factors, and trajectory for cognitive impairment (CI) in former ICU patients in Australia. OBJECTIVES: To test the feasibility of a study protocol designed to ascertain the incidence and impact of CI during recovery from a critical illness. METHODS: We conducted a mixed-methods longitudinal single-centre pilot study...
May 10, 2018: Australian Critical Care: Official Journal of the Confederation of Australian Critical Care Nurses
https://www.readbyqxmd.com/read/29750541/fatty-infiltration-is-a-prognostic-marker-of-muscle-function-after-rotator-cuff-tear
#5
Ana P Valencia, Jim K Lai, Shama R Iyer, Katherine L Mistretta, Espen E Spangenburg, Derik L Davis, Richard M Lovering, Mohit N Gilotra
BACKGROUND: Massive rotator cuff tears (RCTs) begin as primary tendon injuries and cause a myriad of changes in the muscle, including atrophy, fatty infiltration (FI), and fibrosis. However, it is unclear which changes are most closely associated with muscle function. PURPOSE: To determine if FI of the supraspinatus muscle after acute RCT relates to short-term changes in muscle function. STUDY DESIGN: Controlled laboratory study. METHODS: Unilateral RCTs were induced in female rabbits via tenotomy of the supraspinatus and infraspinatus...
May 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29738677/greater-fatigability-in-knee-flexors-vs-knee-extensors-after-a-standardized-fatiguing-protocol
#6
Giuseppe Coratella, Sidney Grosprêtre, Philippe Gimenez, Laurent Mourot
The present study aimed to investigate the effects of a standardized fatiguing protocol on central and peripheral fatigue in knee-flexors and knee-extensors. Thirteen healthy men (age: 23 ± 3 years; height: 1.78 ± 0.09 m; body-mass: 73.6 ± 9.2 kg) volunteered for the present study. Maximal voluntary contraction (MVC), Electromyography (EMG) activity, voluntary activation level (VAL) as an index of central fatigue and twitch potentiation as an index of peripheral fatigue were measured before and after the fatiguing protocol...
May 8, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29726694/the-role-of-the-nervous-system-in-neuromuscular-fatigue-induced-by-ultra-endurance-exercise
#7
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/29719513/adaptive-changes-after-2-weeks-of-10-s-sprint-interval-training-with-various-recovery-times
#8
Robert A Olek, Sylwester Kujach, Ewa Ziemann, Wieslaw Ziolkowski, Piotr Waz, Radoslaw Laskowski
Purpose: The aim of this study was to compare the effect of applying two different rest recovery times in a 10-s sprint interval training session on aerobic and anaerobic capacities as well as skeletal muscle enzyme activities. Methods: Fourteen physically active but not highly trained male subjects (mean maximal oxygen uptake 50.5 ± 1.0 mlO2 ·kg-1 ·min-1 ) participated in the study. The training protocol involved a series of 10-s sprints separated by either 1-min (SIT10:1) or 4-min (SIT10:4) of recovery...
2018: Frontiers in 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
#9
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/29710835/eicosahexanoic-acid-epa-and-docosahexanoic-acid-dha-in-muscle-damage-and-function
#10
REVIEW
Eisuke Ochi, Yosuke Tsuchiya
Nutritional supplementation not only helps in improving and maintaining performance in sports and exercise, but also contributes in reducing exercise fatigue and in recovery from exhaustion. Fish oil contains large amounts of omega-3 fatty acids, eicosapentaenoic acid (EPA; 20:5 n-3) and docosahexaenoic acid (DHA; 22:6 n-3). It is widely known that omega-3 fatty acids are effective for improving cardiac function, depression, cognitive function, and blood as well as lowering blood pressure. In the relationship between omega-3 fatty acids and exercise performance, previous studies have been predicted improved endurance performance, antioxidant and anti-inflammatory responses, and effectivity against delayed-onset muscle soreness...
April 29, 2018: Nutrients
https://www.readbyqxmd.com/read/29671103/role-of-ca-2-in-changing-active-force-during-intermittent-submaximal-stimulation-in-intact-single-mouse-muscle-fibers
#11
Lisa D Glass, Arthur J Cheng, Brian R MacIntosh
Fatigue of single mouse fibers during repeated high-frequency stimulation results initially from decreased Ca2+ sensitivity while free myoplasmic calcium concentration ([Ca2+ ]m ) increases, followed by decreasing [Ca2+ ]m . Recovery of active force with low-frequency stimulation is slow and persistent fatigue results from low [Ca2+ ]m . However, the consequences of intermittent submaximal contractions are not known. The aim of the present study was to investigate the changes in [Ca2+ ]m and active force during intermittent submaximal contractions and subsequent recovery...
April 18, 2018: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/29651514/perspectives-in-football-medicine
#12
REVIEW
M Waldén, M Hägglund, H Bengtsson, J Ekstrand
The high injury rate among men's professional football players is well-known. Therefore, the Union of European Football Associations (UEFA) launched an injury study already in 2001. This study, the UEFA Elite Club Injury Study (ECIS), currently includes data from a total of 51 clubs from 18 European countries with more than 14,000 registered injuries. With the 21st  World Cup (WC) in Russia just around the corner, we have from our study identified a higher match injury rate and a higher proportion of severe injuries in the European Championships compared to the preceding club competitive seasons...
April 12, 2018: Der Unfallchirurg
https://www.readbyqxmd.com/read/29627884/the-influence-of-post-exercise-cold-water-immersion-on-adaptive-responses-to-exercise-a-review-of-the-literature
#13
REVIEW
James R Broatch, Aaron Petersen, David J Bishop
Post-exercise cold-water immersion (CWI) is used extensively in exercise training as a means to minimise fatigue and expedite recovery between sessions. However, debate exists around its merit in long-term training regimens. While an improvement in recovery following a single session of exercise may improve subsequent training quality and stimulus, reports have emerged suggesting CWI may attenuate long-term adaptations to exercise training. Recent developments in the understanding of the molecular mechanisms governing the adaptive response to exercise in human skeletal muscle have provided potential mechanistic insight into the effects of CWI on training adaptations...
April 7, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29626165/collagen-xiii-is-required-for-neuromuscular-synapse-regeneration-and-functional-recovery-after-peripheral-nerve-injury
#14
Zarin Zainul, Anne Heikkinen, Hennariikka Koivisto, Iina Rautalahti, Mika Kallio, Shuo Lin, Heli Härönen, Oula Norman, Markus A Rüegg, Heikki Tanila, Taina Pihlajaniemi
Collagen XIII occurs as both a transmembrane-bound and a shed extracellular protein, and is able to regulate the formation and function of neuromuscular synapses. Its absence results in myasthenia, i.e. pre-and postsynaptic defects at the neuromuscular junction (NMJ), leading to destabilization of the motor nerves, muscle regeneration and atrophy. Mutations in COL13A1 have recently been found to cause congenital myasthenic syndrome (CMS), characterized by fatigue and chronic muscle weakness, which may be lethal...
April 6, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29621110/steps-to-enhance-early-recovery-after-hematopoietic-stem-cell-transplantation-lessons-learned-from-a-physical-activity-feasibility-study
#15
Eileen Danaher Hacker, Tara Peters, Pritesh Patel, Damiano Rondelli
AIMS: This pilot study tested and refined a free-living physical activity intervention. The investigators evaluated the acceptability and feasibility of the intervention after hematopoietic stem cell transplantation and determined preliminary effects on physical activity, fatigue, muscle strength, functional ability, and quality of life. DESIGN: This pilot study used a 1-group, pretest-posttest design. METHODS: The free-living physical activity intervention consisted of an education component and 6 weeks of gradually increasing physical activity after discharge from the hospital...
May 2018: Clinical Nurse Specialist CNS
https://www.readbyqxmd.com/read/29620966/the-influence-of-training-load-exposure-to-match-play-and-sleep-duration-on-daily-wellbeing-measures-in-youth-athletes
#16
Thomas Sawczuk, Ben Jones, Sean Scantlebury, Kevin Till
This study assessed the influence of training load, exposure to match play and sleep duration on two daily wellbeing measures in youth athletes. Forty-eight youth athletes (age 17.3 ± 0.5 years) completed a daily wellbeing questionnaire (DWB), the Perceived Recovery Status scale (PRS), and provided details on the previous day's training loads (TL) and self-reported sleep duration (sleep) every day for 13 weeks (n = 2727). Linear mixed models assessed the effect of TL, exposure to match play and sleep on DWB and PRS...
April 5, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29599862/fatigue-responses-in-various-muscle-groups-in-well-trained-competitive-male-players-after-a-simulated-soccer-game
#17
Dan Fransson, Jeppe Foged Vigh-Larsen, Ioannis G Fatouros, Peter Krustrup, Magni Mohr
We examined the degree of post-game fatigue and the recovery pattern in various leg and upper-body muscle groups after a simulated soccer game. Well-trained competitive male soccer players (n = 12) participated in the study. The players completed the Copenhagen Soccer Test, a 2 x 45 min simulated soccer protocol, following baseline measures of maximal voluntary contractions of multiple muscle groups and systemic markers of muscle damage and inflammation at 0, 24 and 48 h into recovery. All muscle groups had a strength decrement ( p ≤ 0...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29581653/effects-of-mechanical-bed-massage-on-exercise-induced-back-fatigue-in-athletes
#18
Houyong Zhong, Wichai Eungpinichpong, Xingze Wang, Uraiwon Chatchawan, Sawitri Wanpen, Orawan Buranruk
[Purpose] The study aimed to preliminarily investigate the effects of mechanical-bed massage on exercise-induced back fatigue in athletes. [Subjects and Methods] Twelve male college athletes, randomly allocated to experimental or control groups, were instructed to perform reverse sit-up for 8 sessions until they became fatigued. The experimental group received a 20-min mechanical-bed massage session, while the control group rested on a bed for the same period of time. Visual Analogue Scale (VAS) on perceived back muscle fatigue, back muscle endurance, and Heart Rate Variability (HRV) parameters including stress index (SI), HRV index, SDNN, RMSSD, pNN50, LF, HF, and LF/HF were analyzed...
March 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29576951/change-in-skeletal-muscle-stiffness-after-running-competition-is-dependent-on-both-running-distance-and-recovery-time-a-pilot-study
#19
Seyedali Sadeghi, Cassidy Newman, Daniel H Cortes
Long-distance running competitions impose a large amount of mechanical loading and strain leading to muscle edema and delayed onset muscle soreness (DOMS). Damage to various muscle fibers, metabolic impairments and fatigue have been linked to explain how DOMS impairs muscle function. Disruptions of muscle fiber during DOMS exacerbated by exercise have been shown to change muscle mechanical properties. The objective of this study is to quantify changes in mechanical properties of different muscles in the thigh and lower leg as function of running distance and time after competition...
2018: PeerJ
https://www.readbyqxmd.com/read/29566543/beetroot-based-gel-supplementation-improves-handgrip-strength-forearm-muscle-o2-saturation-but-not-exercise-tolerance-and-blood-volume-in-jiu-jitsu-athletes
#20
Gustavo Vieira de Oliveira, Luiz Nascimento, Mônica Volino-Souza, Jacilene Mesquita, Thiago Alvares
The ergogenic effect of beetroot on the exercise performance of trained cyclists, runners, kayakers, and swimmers has been demonstrated. However, whether or not beetroot supplementation presents a beneficial effect on the exercise performance of jiu-jitsu athletes (JJA) remains inconclusive. Therefore, present study assessed the effect of beetroot-based gel (BG) supplementation on maximal voluntary contraction (MVC), exercise time until fatigue (ETF), muscle O2 saturation (SmO2), blood volume (tHb), and plasma nitrate and lactate in response to handgrip isotonic exercise (HIE) in JJA...
March 22, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
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