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Glycogen and fatigue

Yuichi Tsuda, Kaori Iwasawa, Makoto Yamaguchi
We investigated the respective effects of the acute supplementation of valine, leucine, and isoleucine on metabolism-related markers by administering a swimming exercise test to rats. As a behavioral analysis, we evaluated the effect of valine and that of leucine on spontaneous activity after exercise. Acute supplementation of valine before exercise significantly suppressed the depression of the liver glycogen and the blood glucose after exercise, whereas leucine decreased the blood glucose and isoleucine had no effect...
February 23, 2018: Bioscience, Biotechnology, and Biochemistry
Abdullah F Alghannam, Javier T Gonzalez, James A Betts
The importance of post-exercise recovery nutrition has been well described in recent years, leading to its incorporation as an integral part of training regimes in both athletes and active individuals. Muscle glycogen depletion during an initial prolonged exercise bout is a main factor in the onset of fatigue and so the replenishment of glycogen stores may be important for recovery of functional capacity. Nevertheless, nutritional considerations for optimal short-term (3-6 h) recovery remain incompletely elucidated, particularly surrounding the precise amount of specific types of nutrients required...
February 23, 2018: Nutrients
Audrey Yule Coqueiro, Raquel Raizel, Andrea Bonvini, Thaís Hypólito, Allan da Mata Godois, Jéssica Ramos Rocha Pereira, Amanda Beatriz de Oliveira Garcia, Rafael de Souza Bittencourt Lara, Marcelo Macedo Rogero, Julio Tirapegui
Recent evidence suggests that increased brain serotonin synthesis impairs performance in high-intensity intermittent exercise and specific amino acids may modulate this condition, delaying fatigue. This study investigated the effects of glutamine and alanine supplementation on central fatigue markers in rats submitted to resistance training (RT). Wistar rats were distributed in: sedentary (SED), trained (CON), trained and supplemented with alanine (ALA), glutamine and alanine in their free form (G + A), or as dipeptide (DIP)...
January 25, 2018: Nutrients
Han Gao, Wencheng Zhang, Bingsong Wang, Ailing Hui, Biao Du, Tingting Wang, Ling Meng, Huixi Bian, Zeyu Wu
The aim of this study was to investigate the anti-fatigue activity of polysaccharide fractions from Abelmoschus esculentus (L.) Moench (AE) in mice. After crude polysaccharide (CAEP) was extracted from AE and purified by DEAE cellulose-52 column, two polysaccharide fractions (AEP-1 and AEP-2) were obtained. The structural analysis suggested that AEP-1 and AEP-2 were a RG-I polysaccharide and an AG-II polysaccharide, respectively. According to the results of the weight-loaded swimming test, compared with the negative control group, the CAEP, AEP-1 and AEP-2 treatment groups could prolong the swimming time, decrease serum urea nitrogen (SUN) and blood lactic acid (BLA), and increase hepatic glycogen (HG) and muscle glycogen (MG), which indicated that okra polysaccharides have an effective anti-fatigue activity...
January 23, 2018: Food & Function
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
Na-Ra Han, Hee-Yun Kim, Na-Rae Kim, Won-Kyung Lee, Hyein Jeong, Hyung-Min Kim, Hyun-Ja Jeong
Fatigue is a common and serious health problem, and various dietary interventions have previously been employed to ameliorate fatigue. The aim of the current study was to investigate the anti‑fatigue effects of Danish porcine placenta (DPP) and its major dipeptides, including leucine‑glycine (LG) and glycine‑leucine (GL). The anti‑fatigue effects of orally administered DPP, LG and GL were determined using a treadmill exercise test and a forced swimming test (FST) in mice. Additionally, the anti‑inflammatory effects of DPP, LG and GL were investigated in activated splenocytes...
December 20, 2017: Molecular Medicine Reports
Fauzani N Jamaluddin, Siti A Ahmad, Samsul Bahari Mohd Noor, Wan Zuha Wan Hassan, Y Azhar
Sports training is very important to athletes in improving and maintaining their performances. It commonly involves high intensity exercise and requires longer time for fatigue to recover, compares to normal activity. During training, adequate rest is essential to allow recuperation and build body strength. Unfortunately, inadequate rest exposes the body to prolonged fatigue (PF). Hence, this condition needs to be managed accordingly to avoid chronic fatigue syndrome. Recent findings indicate that there are strong characteristics on surface EMG under PF conditions...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Carmelina Gurrieri, Juraj Sprung, Toby N Weingarten, Mary E Warner
BACKGROUND: Glycogen storage diseases are rare genetic disorders of glycogen synthesis, degradation, or metabolism regulation. When these patients are subjected to anesthesia, perioperative complications can develop, including hypoglycemia, rhabdomyolysis, myoglobinuria, acute renal failure, and postoperative fatigue. The objective of this study was to describe the perioperative course of a cohort of patients with glycogen storage diseases. METHODS: This is a retrospective review of patients with glycogen storage diseases undergoing anesthetic care at our institution from January 1, 1990, through June 30, 2015 to assess perioperative management and outcomes...
October 6, 2017: BMC Anesthesiology
Arthur J Cheng, Sarah J Willis, Christoph Zinner, Thomas Chaillou, Niklas Ivarsson, Niels Ørtenblad, Johanna T Lanner, Hans-Christer Holmberg, Håkan Westerblad
Manipulation of muscle temperature is believed to improve post-exercise recovery, with cooling being especially popular among athletes. However, it is unclear whether such temperature manipulations actually have positive effects. Accordingly, we studied the effect of muscle temperature on the acute recovery of force and fatigue resistance after endurance exercise. One hour of moderate-intensity arm cycling exercise in humans was followed by two hours recovery in which the upper arms were either heated to 38°C, not treated (33°C), or cooled to ∼15°C...
October 4, 2017: Journal of Physiology
Maheen Mahwish Surhio, Yufen Wang, Shi Fang, Jinglei Li, Ming Ye
The present study was designed to evaluate the anti-fatigue activity of an exopolysaccharide LEP-1b and its carboxymethylated derivative CLEP-1b from a Lachnum sp. Carboxymethylation was confirmed through FT-IR and13 C NMR spectroscopies, which showed that the (-CH2 COOH) group was attached to an oxygen (O) atom of the hydroxyl group on (C-3) of LEP-1b. Each treatment group LEP-1b and CLEP-1b at doses (50, 100, 200mg/kg, respectively) ameliorated physical fatigue and extended exhaustive swimming time in mice...
October 15, 2017: Bioorganic & Medicinal Chemistry Letters
Yangyang Liu, Changjiang Liu
Actinidia arguta (Siebold et Zucc.) Planch. ex. Miq. is one of the most recently domesticated fruit species with increasing commercial production worldwide. It is a well-known traditional Chinese medicine and is used to reduce blood glucose and treat atopic dermatitis. In addition, it possesses antioxidant, anticancer, and antiallergic properties. In this study, we investigated the physical antifatigue and exercise performance effects of A. arguta crude alkaloids (AACA) extracted with 70% ethanol. Four groups of male Kunming mice (n = 16) were orally administered AACA at doses of 0 mg/kg/d (vehicle), 50 mg/kg/d (AACA-50), 100 mg/kg/d (AACA-100), or 200 mg/kg/d (AACA-200) for 28 days...
October 2016: Journal of Food and Drug Analysis
Valérie Decostre, Pascal Laforêt, Marie De Antonio, Kahina Kachetel, Aurélie Canal, Gwenn Ollivier, Aleksandra Nadaj-Pakleza, François M Petit, Karim Wahbi, Abdallah Fayssoil, Bruno Eymard, Anthony Behin, Philippe Labrune, Jean-Yves Hogrel
Glycogen storage disease type III (GSDIII) is an autosomal recessive disorder caused by mutations in the AGL gene coding for the glycogen debranching enzyme. Current therapy is based on dietary adaptations but new preclinical therapies are emerging. The identification of outcome measures which are sensitive to disease progression becomes critical to assess the efficacy of new treatments in upcoming clinical trials. In order to prepare future longitudinal studies or therapeutic trials with large cohorts, information about disease progression is required...
November 2017: Molecular Genetics and Metabolism
Nicolai Preisler, Jonathan Cohen, Christoffer Rasmus Vissing, Karen Lindhardt Madsen, Katja Heinicke, Lydia Jane Sharp, Lauren Phillips, Nadine Romain, Sun Young Park, Marta Newby, Phil Wyrick, Pedro Mancias, Henrik Galbo, John Vissing, Ronald Gerald Haller
OBJECTIVE: We investigated metabolism and physiological responses to exercise in an 18-year-old woman with multiple congenital abnormalities and exertional muscle fatigue, tightness, and rhabdomyolysis. METHODS: We studied biochemistry in muscle and fibroblasts, performed mutation analysis, assessed physiological responses to forearm and cycle-ergometer exercise combined with stable-isotope techniques and indirect calorimetry, and evaluated the effect of IV glucose infusion and oral sucrose ingestion on the exercise response...
November 2017: Molecular Genetics and Metabolism
Gideon Steinbach, David M Hockenbery, Gerwin Huls, Terry Furlong, David Myerson, Keith R Loeb, Jesse R Fann, Christina Castilla-Llorente, George B McDonald, Paul J Martin
Severe intestinal graft-vs-host disease (GVHD) after allogeneic hematopoietic cell transplantation (HCT) causes mucosal ulceration and induces innate and adaptive immune responses that amplify and perpetuate GVHD and the associated barrier dysfunction. Pharmacological agents to target mucosal barrier dysfunction in GVHD are needed. We hypothesized that induction of Wnt signaling by lithium, an inhibitor of glycogen synthase kinase (GSK3), would potentiate intestinal crypt proliferation and mucosal repair and that inhibition of GSK3 in inflammatory cells would attenuate the deregulated inflammatory response to mucosal injury...
2017: PloS One
Kristyen A Tomcik, Donny M Camera, Julia L Bone, Megan L Ross, Nikki A Jeacocke, Bill Tachtsis, Joan Senden, Luc J C van Loon, John A Hawley, Louise M Burke
INTRODUCTION: Creatine- and carbohydrate-loading are dietary strategies used to enhance exercise capacity. This study examined the metabolic and performance effects of a combined creatine and CHO-loading regiment on time-trial (TT) cycling bouts. METHODS: Eighteen well-trained (~65mL[BULLET OPERATOR]kg[BULLET OPERATOR]min VO2peak) males completed three performance trials (PT) comprised of a 120-km cycling TT interspersed with alternating 1- and 4-km sprints (6 sprints each) performed every 10-km followed by an inclined ride to fatigue (~90% VO2peak)...
August 11, 2017: Medicine and Science in Sports and Exercise
Nigel F Delaney, Rohit Sharma, Laura Tadvalkar, Clary B Clish, Ronald G Haller, Vamsi K Mootha
McArdle disease and mitochondrial myopathy impair muscle oxidative phosphorylation (OXPHOS) by distinct mechanisms: the former by restricting oxidative substrate availability caused by blocked glycogen breakdown, the latter because of intrinsic respiratory chain defects. We applied metabolic profiling to systematically interrogate these disorders at rest, when muscle symptoms are typically minimal, and with exercise, when symptoms of premature fatigue and potential muscle injury are unmasked. At rest, patients with mitochondrial disease exhibit elevated lactate and reduced uridine; in McArdle disease purine nucleotide metabolites, including xanthine, hypoxanthine, and inosine are elevated...
August 1, 2017: Proceedings of the National Academy of Sciences of the United States of America
Kenji Doma, Glen B Deakin, David J Bentley
A single bout of resistance training induces residual fatigue, which may impair performance during subsequent endurance training if inadequate recovery is allowed. From a concurrent training standpoint, such carry-over effects of fatigue from a resistance training session may impair the quality of a subsequent endurance training session for several hours to days with inadequate recovery. The proposed mechanisms of this phenomenon include: (1) impaired neural recruitment patterns; (2) reduced movement efficiency due to alteration in kinematics during endurance exercise and increased energy expenditure; (3) increased muscle soreness; and (4) reduced muscle glycogen...
November 2017: Sports Medicine
Lisa E Heaton, Jon K Davis, Eric S Rawson, Ryan P Nuccio, Oliver C Witard, Kimberly W Stein, Keith Baar, James M Carter, Lindsay B Baker
Team sport athletes face a variety of nutritional challenges related to recovery during the competitive season. The purpose of this article is to review nutrition strategies related to muscle regeneration, glycogen restoration, fatigue, physical and immune health, and preparation for subsequent training bouts and competitions. Given the limited opportunities to recover between training bouts and games throughout the competitive season, athletes must be deliberate in their recovery strategy. Foundational components of recovery related to protein, carbohydrates, and fluid have been extensively reviewed and accepted...
November 2017: Sports Medicine
Hugh S Winwood-Smith, Craig E Franklin, Craig R White
Long-term studies have found that low-carbohydrate diets are more effective for weight loss than calorie-restricted diets in the short term but equally or only marginally more effective in the long term. Low-carbohydrate diets have been linked to reduced glycogen stores and increased feelings of fatigue. We propose that reduced physical activity in response to lowered glycogen explains the diminishing weight loss advantage of low-carbohydrate compared with low-calorie diets over longer time periods. We explored this possibility by feeding adult Drosophila melanogaster a standard or a low-carbohydrate diet for 9 days and measured changes in metabolic rate, glycogen stores, activity, and body mass...
October 1, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
Meihong Xu, Rui Liang, Yong Li, Junbo Wang
As the building blocks of nucleic acids, nucleotides are conditionally essential nutrients that exhibit multifaceted activities. The present study aimed to evaluate the anti-fatigue effects of dietary nucleotides (NTs) on mice and explore the possible underlying mechanism. Mice were randomly divided into four experimental sets to detect different indicators. Each set of mice was then divided into four groups: (i) one control group and (ii) three NTs groups, which were fed diets supplemented with NTs at concentrations of 0%, 0...
2017: Food & Nutrition Research
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