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Muscular fatigue

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https://www.readbyqxmd.com/read/28315916/muscular-damage-in-a-patient-with-hepatitis-b-induced-by-beta-l-2-deoxythymidine-and-detected-by-18-f-fdg-pet-ct
#1
Jinhua Zi, Changyun Xu, Xuemei Zhang
A 58 years old man under 2'-Deoxy-L-thymidine treatment for his hepatitis B was admitted to our hospital complaining for the last 2 months of recurrent upper abdomen discomfort, fatigue and weight loss of 10 kilograms and general muscular soreness, for 2 weeks. He had elevated creatine kinase (CK), myoglobin, CK-MB and other related or common laboratory findings. Fluorine-18- fluorodeoxyglucose positron emission tomography/ computed tomography ((18)F-FDG PET/CT) showed a diffuse, homogenous, moderately elevated glucose uptake in all muscle groups...
March 20, 2017: Hellenic Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/28290751/comparison-of-thoracic-and-lumbar-erector-spinae-muscle-activation-before-and-after-a-golf-practice-session
#2
Graeme G Sorbie, Fergal M Grace, Yaodong Gu, Julien S Baker, Ukadike C Ugbolue
Lower back pain is commonly associated with golfers. The study aimed: to determine whether thoracic- and lumbar-erector-spinae muscle display signs of muscular fatigue after completing a golf practice session, and to examine the effect of the completed practice session on club head speed, ball speed and absolute carry distance performance variables. Fourteen right-handed male golfers participated in the laboratory-based-study. Surface electromyography (EMG) data was collected from the lead and trail sides of the thoracic- and lumbar-erector-spinae muscle...
March 14, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28288611/benefits-of-resistance-exercise-in-lean-women-with-fibromyalgia-involvement-of-igf-1-and-leptin
#3
Jan L Bjersing, Anette Larsson, Annie Palstam, Malin Ernberg, Indre Bileviciute-Ljungar, Monika Löfgren, Björn Gerdle, Eva Kosek, Kaisa Mannerkorpi
BACKGROUND: Chronic pain and fatigue improves by exercise in fibromyalgia (FM) but underlying mechanisms are not known. Obesity is increased among FM patients and associates with higher levels of pain. Symptom improvement after aerobic exercise is affected by body mass index (BMI) in FM. Metabolic factors such as insulin-like growth factor 1 (IGF-1) and leptin may be involved. In this study, the aim was to evaluate the role of metabolic factors in lean, overweight and obese women during resistance exercise, in relation to symptom severity and muscle strength in women with FM...
March 14, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28287901/the-acute-effects-of-bodyweight-suspension-exercise-on-muscle-activation-and-muscular-fatigue
#4
Trent E Cayot, Jakob D Lauver, Barry W Scheuermann
This investigation examined effects of two exercise modes (barbell, BB; bodyweight suspension, BWS) on muscle activation, resistance load, and fatigue. During session one, nine resistance-trained males completed an elbow flexion one-repetition maximum (1RM). During sessions two and three, subjects completed standing biceps curls to fatigue at 70% 1RM utilizing a randomized exercise mode. Surface electromyography (sEMG) recorded muscle activation of the biceps brachii, triceps brachii, anterior deltoid, posterior deltoid, rectus abdominis, and erector spinae...
March 13, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28287046/acute-effects-of-kinesio-taping-on-muscle-function-and-self-perceived-fatigue-level-in-healthy-adults
#5
Nan Hee Lee, Hyun Chul Jung, Gina Ok, Sukho Lee
This study investigated the acute effects of Kinesio taping (KT) on muscular power, strength, endurance, and self-perceived fatigue level. This is a randomized, partial double-blind, crossover trial. Eighteen healthy adults (7 males [23.86 ± 1.68 years] and 11 females [24.82 ± 3.71 years]) were enrolled in this study. All subjects underwent three different trials which included no tap (NT), placebo tap (PT), and KT. Idividuals were assessed for peak and mean power, muscular strength and endurance, and self-perceived fatigue after each condition...
March 13, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28277983/l-arginine-supplementation-improves-rats-antioxidant-system-and-exercise-performance
#6
E P Silva, L S Borges, C Mendes-da-Silva, S M Hirabara, R H Lambertucci
Reactive species have great importance in sports performance, once they can directly regulate energy production, muscular contraction, inflammation and fatigue. Therefore, the redox control is essential for athletes' performance. Studies demonstrated that L-arginine has an important role in the synthesis of urea, cell growth and production of nitric oxide, moreover, there are indications that it is also able to induce benefits to muscle antioxidant system through the upregulation of some antioxidant enzymes, and by inhibiting some pathways of reactive species production...
March 1, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28277433/changes-in-unilateral-upper-limb-muscular-strength-and-emg-activity-following-a-16-week-strength-training-intervention-survivors-of-breast-cancer
#7
Amanda D Hagstrom, Kathleen A Shorter, Paul W M Marshall
Upper limb strength deficits are frequently observed following breast cancer and its treatments. It is currently unknown whether these unilateral deficits can be corrected by a standard bilateral strength training intervention. Twenty three survivors of breast cancer were included in this analysis. Fourteen performed a 16 week resistance training (RT) intervention, 9 were assigned to a usual care waitlist control group. Electromyographic (EMG) analysis of the pectoralis major and triceps brachii were monitored during three maximal isometric contractions and a fatiguing endurance task...
March 8, 2017: Journal of Strength and Conditioning Research
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
#8
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/28265507/the-effects-of-elevated-pain-inhibition-on-endurance-exercise-performance
#9
Andrew Flood, Gordon Waddington, Richard J Keegan, Kevin G Thompson, Stuart Cathcart
BACKGROUND: The ergogenic effects of analgesic substances suggest that pain perception is an important regulator of work-rate during fatiguing exercise. Recent research has shown that endogenous inhibitory responses, which act to attenuate nociceptive input and reduce perceived pain, can be increased following transcranial direct current stimulation of the hand motor cortex. Using high-definition transcranial direct current stimulation (HD-tDCS; 2 mA, 20 min), the current study aimed to examine the effects of elevated pain inhibitory capacity on endurance exercise performance...
2017: PeerJ
https://www.readbyqxmd.com/read/28249801/effects-of-different-exercise-modalities-on-fatigue-in-prostate-cancer-patients-undergoing-androgen-deprivation-therapy-a-year-long-randomised-controlled-trial
#10
Dennis R Taaffe, Robert U Newton, Nigel Spry, David Joseph, Suzanne K Chambers, Robert A Gardiner, Brad A Wall, Prue Cormie, Kate A Bolam, Daniel A Galvão
BACKGROUND: Physical exercise mitigates fatigue during androgen deprivation therapy (ADT); however, the effects of different exercise prescriptions are unknown. OBJECTIVES: To determine the long-term effects of different exercise modes on fatigue in prostate cancer patients undergoing ADT. DESIGN, SETTING, AND PARTICIPANTS: Between 2009 and 2012, 163 prostate cancer patients aged 43-90 y on ADT were randomised to exercise targeting the musculoskeletal system (impact loading+resistance training; ILRT; n=58), the cardiovascular and muscular systems (aerobic+resistance training; ART; n=54), or to usual care/delayed exercise (DEL; n=51) for 12 mo across university-affiliated exercise clinics in Australia...
February 26, 2017: European Urology
https://www.readbyqxmd.com/read/28249595/non-contact-synchronous-dynamic-measurement-of-respiratory-rate-and-heart-rate-based-on-dual-sensitive-regions
#11
Bing Wei, Xuan He, Chao Zhang, Xiaopei Wu
BACKGROUND: Currently, many imaging photoplethysmography (IPPG) researches have reported non-contact measurements of physiological parameters, such as heart rate (HR), respiratory rate (RR), etc. However, it is accepted that only HR measurement has been mature for applications, and other estimations are relatively incapable for reliable applications. Thus, it is worth keeping on persistent studies. Besides, there are some issues commonly involved in these approaches need to be explored further...
January 17, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28238153/the-role-of-thigh-muscular-efforts-in-limiting-sit-to-stand-capacity-in-healthy-young-and-older-adults
#12
Megan Bryanton, Martin Bilodeau
Aging is associated with an unavoidable decline in muscle mass, known as sarcopenia, leading to neuromuscular declines, muscle weakness, and subsequent disability. One particular measure utilized by rehabilitative professionals in evaluating functional declines in older persons is sit-to-stand (STS) capacity. The purpose of this investigation was to determine the role of activation intensity requirements of the thigh musculature in limiting a multi-joint STS endurance task. To do so, surface EMG signals of the quadriceps femoris (QF) and hamstrings (biceps femoris; BF) and their co-activation ratios (H:Q) were collected in young (18-35 years; n = 12) and older (60-75 years; n = 12) adult participants who repeatedly stood from a seated position until exhaustion...
February 25, 2017: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/28236562/hand-rest-and-wrist-support-are-effective-in-preventing-fatigue-during-prolonged-typing
#13
Bianca Callegari, Marília Maniglia de Resende, Manoel da Silva Filho
STUDY DESIGN: Case series (longitudinal). INTRODUCTION: Only few reports concerning the efficacy of commonly used strategies for preventing upper limb occupational disorders associated with prolonged typing exist. PURPOSE OF THE STUDY: We aimed to investigate whether the duration of typing and the use of 2 strategies (hand rest and wrist support) changes muscle physiological response and therefore the electromyography records. METHODS: We enrolled 25 volunteers, who were unfamiliar with the task and did not have musculoskeletal disorders...
February 21, 2017: Journal of Hand Therapy: Official Journal of the American Society of Hand Therapists
https://www.readbyqxmd.com/read/28228371/dance-for-adults-with-fibromyalgia-what-do-we-know-about-it-protocol-for-a-scoping-review
#14
Julia Bidonde, Catherine Boden, Angela J Busch, Suelen M Goes, Soo Kim, Emily Knight
BACKGROUND: Fibromyalgia is a chronic disorder characterized by widespread muscular tenderness, pain, fatigue, and cognitive difficulties. Nonpharmacological treatment options, such as physical activity, are important for people with fibromyalgia. There are strong recommendations to support engagement in physical activity for symptom management among adults with fibromyalgia. Dance is a mode of physical activity that may allow individuals with fibromyalgia to improve their physical function, health, and well-being...
February 22, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/28228000/c60-fullerene-as-promising-therapeutic-agent-for-the-prevention-and-correction-of-skeletal-muscle-functioning-at-ischemic-injury
#15
D M Nozdrenko, D O Zavodovskyi, T Yu Matvienko, S Yu Zay, K I Bogutska, Yu I Prylutskyy, U Ritter, P Scharff
The therapeutic effect of pristine C60 fullerene aqueous colloid solution (C60FAS) on the functioning of the rat soleus muscle at ischemic injury depending on the time of the general pathogenesis of muscular system and method of administration C60FAS in vivo was investigated. It was found that intravenous administration of C60FAS is the optimal for correction of speed macroparameters of contraction for ischemic muscle damage. At the same time, intramuscular administration of C60FAS shows pronounced protective effect in movements associated with the generation of maximum force responses or prolonged contractions, which increase the muscle fatigue level...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28223230/myotoxicity-of-statins-mechanism-of-action
#16
REVIEW
Patrick du Souich, Ghislaine Roederer, Robert Dufour
Statins are effective drugs to reduce cardiovascular events secondary to dyslipidemia; however, they cause frequent undesirable side effects. The incidence of statin-induced myotoxicity (SIM) is presented by 7 to 29% of patients, depending upon the report. SIM may develop in presence of abnormally high concentrations of statins in the myocyte and/or in presence of muscular conditions that may predispose to SIM. High concentrations of statins in the myocyte may occur whenever the activity of liver influx membrane transporters, namely OATP1B1, of drug metabolizing enzymes, and of liver and muscular efflux transporters, MDR1 and BCRP, is reduced...
February 14, 2017: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28212266/individual-patterns-in-blood-borne-indicators-of-fatigue-trait-or-chance
#17
Ross Julian, Tim Meyer, Hugh H K Fullagar, Sabrina Skorski, Mark Pfeiffer, Michael Kellmann, Alexander Ferrauti, Anne Hecksteden
Julian, R, Meyer, T, Fullagar, HHK, Skorski, S, Pfeiffer, M, Kellmann, M, Ferrauti, A, and Hecksteden, A. Individual patterns in blood-borne indicators of fatigue-trait or chance. J Strength Cond Res 31(3): 608-619, 2017-Blood-borne markers of fatigue such as creatine kinase (CK) and urea (U) are widely used to fine-tune training recommendations. However, predictive accuracy is low. A possible explanation for this dissatisfactory characteristic is the propensity of athletes to react to different patterns of fatigue indicators (e...
March 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28199218/surface-emg-and-muscle-fatigue-multi-channel-approaches-to-the-study-of-myoelectric-manifestations-of-muscle-fatigue
#18
Marco Gazzoni, Alberto Botter, Taian Vieira
On a broad view, fatigue is used to indicate a somewhat degree of weariness. On the muscular level, fatigue posits the reduced capacity of muscle fibres to produce force, even in the presence of motor neuron excitation via either spinal mechanisms or electric pulses applied externally. Prior to decreased force, when sustaining physically demanding tasks, alterations in the muscle electrical properties take place. These alterations, termed myoelectric manifestation of fatigue, can be assessed non-invasively with a pair of surface electrodes positioned appropriately on the target muscle; traditional approach...
February 15, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28195978/lack-of-influence-of-muscular-performance-parameters-on-spatio-temporal-adaptations-with-increased-running-velocity
#19
Luis E Roche-Seruendo, Felipe García-Pinillos, Joana Haicaguerre, Ana V Bataller-Cervero, Víctor M Soto-Hermoso, Pedro Á Latorre-Román
This study aimed to analyse the influence of muscular performance parameters on spatio-temporal gait characteristics during running when gradually increasing speed. 51 recreationally trained male endurance runners (age: 28 ± 8 years) voluntarily participated in this study. Subjects performed a battery of jumping tests (squat jump, countermovement jump, and 20 cm drop jump), and after that, the subjects performed an incremental running test (10 to 20 km/h) on a motorized treadmill. Spatio-temporal parameters were measured using the OptoGait system...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28132977/mitochondrial-trifunctional-protein-deficiency-an-adult-patient-with-similar-progress-to-charcot-marie-tooth-disease
#20
Yuki Yamamoto, Naoko Matsui, Yu Hiramatsu, Yoshimichi Miyazaki, Hiroyuki Nodera, Yuishin Izumi, Hiroshi Takashima, Ryuji Kaji
A 45-year-old man presented to us due to slowly progressive muscle weakness and sensory disturbances in his lower limbs since his 40's. He reported multiple episodes of exercise-induced severe muscle fatigue and brown urine in his childhood, which disappeared by age 20. A nerve conduction study showed peripheral axonal neuropathy and then Charcot-Marie-Tooth disease (CMT) was considered as the most likely diagnosis; however, exome sequencing failed to identify a mutation in the known genes of CMTs. Since age 55, he recurrently developed severe rhabdomyolysis that required hospitalization...
February 25, 2017: Rinshō Shinkeigaku, Clinical Neurology
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