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Glycogen and fatigue

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https://www.readbyqxmd.com/read/28806275/effects-of-creatine-and-carbohydrate-loading-on-cycling-time-trial-performance
#1
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
https://www.readbyqxmd.com/read/28716914/metabolic-profiles-of-exercise-in-patients-with-mcardle-disease-or-mitochondrial-myopathy
#2
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
https://www.readbyqxmd.com/read/28702901/implications-of-impaired-endurance-performance-following-single-bouts-of-resistance-training-an-alternate-concurrent-training-perspective
#3
REVIEW
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...
July 12, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28702900/selected-in-season-nutritional-strategies-to-enhance-recovery-for-team-sport-athletes-a-practical-overview
#4
REVIEW
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...
July 12, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28701319/low-carbohydrate-diet-induces-metabolic-depression-a-possible-mechanism-to-conserve-glycogen
#5
Hugh Stirling Winwood-Smith, Craig E Franklin, Craig R White
Long-term studies have found 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 to low calorie diets over longer time scales. We explored this possibility by feeding adult Drosophila melanogaster either a standard or low carbohydrate diet for nine days and measured changes in metabolic rate, glycogen stores, activity, and body mass...
July 12, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28659748/anti-fatigue-effects-of-dietary-nucleotides-in-mice
#6
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
https://www.readbyqxmd.com/read/28588427/evaluation-of-anti-fatigue-property-of-the-extruded-product-of-cereal-grains-mixed-with-cordyceps-militaris-on-mice
#7
Lei Zhong, Liyan Zhao, Fangmei Yang, Wenjian Yang, Yong Sun, Qiuhui Hu
BACKGROUND: Fatigue is a biological phenomenon that involves a feeling of extreme physical or mental tiredness that could potentially cause some severe chronic diseases. Recently, diet therapy has provided a new alternative to alleviate physical fatigue. In our previous study, addition of Cordyceps militaris (C. militaris) into an extruded product was shown to provide high nutrition and unique flavors; however, little is known whether this product has some scientific evidence regarding anti-fatigue property...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28539729/anti-fatigue-effect-of-green-tea-polyphenols-epigallocatechin-3-gallate-egcg
#8
Yu-Song Teng, Di Wu
BACKGROUND: (-)-Epigallocatechin-3-gallate (EGCG) is the most abundant of the green tea polyphenols that exhibit a variety of bioactivities. The objective of this study was to evaluate the anti-fatigue effect of EGCG by forced swimming exercise. MATERIALS AND METHODS: The mice were divided into one control group and three EGCG-treated groups. The control group was administered with distilled water and EGCG-treated groups were administered with different dose of EGCG (50, 100, and 200 mg/kg) by oral gavage for 28 days...
April 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28469746/low-carbohydrate-high-fat-diet-can-it-help-exercise-performance
#9
Chen-Kang Chang, Katarina Borer, Po-Ju Lin
Low-carbohydrate-high-fat (LCHF) diets have been used as a means of weight loss and control of symptoms in several clinical conditions. There is emerging evidence that the metabolic changes induced by LCHF diets enhance endurance performance. The aims of this review are to examine the evidence of LCHF diets in improving various aspects of athletic performance. Long-term LCHF dietary intake may help control body weight and fat mass while maintaining lean body mass in athletes in weight-sensitive sports. LCHF-adapted endurance athletes can reach the maximal fat oxidation rate of approximately 1...
February 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28458274/supplementation-with-hualian-no-4-wild-bitter-gourd-momordica-charantia-linn-var-abbreviata-ser-extract-increases-anti-fatigue-activities-and-enhances-exercise-performance-in-mice
#10
Chien-Yu Hsiao, Yi-Ming Chen, Yi-Ju Hsu, Chi-Chang Huang, Hsin-Ching Sung, Sheng-Shih Chen
Hualian No. 4 wild bitter gourd (WBG) is a specific vegetable cultivated by the Hualien District Agricultural Research and Extension Station in Taiwan. WBG is commonly consumed as a vegetable and used as a popular folk medicine. However, few studies have demonstrated the effects of WBG supplementation on exercise performance, physical fatigue and the biochemical profile. The purpose of this study was to evaluate the potential beneficial effects of WBG extract on fatigue and ergogenic functions following physiological challenge...
June 29, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28432118/molecular-basis-for-exercise-induced-fatigue-the-importance-of-strictly-controlled-cellular-ca-2-handling
#11
Arthur J Cheng, Nicolas Place, Håkan Westerblad
The contractile function of skeletal muscle declines during intense or prolonged physical exercise, that is, fatigue develops. Skeletal muscle fibers fatigue acutely during highly intense exercise when they have to rely on anaerobic metabolism. Early stages of fatigue involve impaired myofibrillar function, whereas decreased Ca(2+) release from the sarcoplasmic reticulum (SR) becomes more important in later stages. SR Ca(2+) release can also become reduced with more prolonged, lower intensity exercise, and it is then related to glycogen depletion...
April 21, 2017: Cold Spring Harbor Perspectives in Medicine
https://www.readbyqxmd.com/read/28413958/anti-fatigue-effects-of-active-ingredients-from-traditional-chinese-medicine-a-review
#12
Si-Si Zhou, Jian-Guo Jiang
Fatigue, a phenomenon which is believed to be caused by body exercise, can lead to the failure of predetermined exercise intensity maintenance and sport ability declination. The usage of traditional Chinese medicine (TCM) in the treatment of fatigue has long been practiced in clinical and showed significant effects. This article covers related literatures in recent years and sorts the effective ingredients from TCM for treating fatigue into a few categories including alkaloids, saponins, polysaccharides, polyphenols, polypeptide, terpene, proteins and other active ingredients...
April 14, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28413647/nigella-sativa-seed-extract-attenuates-the-fatigue-induced-by-exhaustive-swimming-in-rats
#13
Mahbubur Rahman, Dong Kwon Yang, Gi-Beum Kim, Sei-Jin Lee, Shang-Jin Kim
In previous studies, Nigella sativa (NS) has been studied due to its various physiological and pharmacological activities. However, evidence on the effects of NS on physical fatigue following exhaustive swimming remains limited. In the present study, the authors evaluated the potential beneficial effects of NS against the fatigue activity following exhaustive swimming. Rats were orally administered with NS extract (2 g/kg/day) for 21 days, and the anti-fatigue effect was assessed by exhaustive swimming exercise...
April 2017: Biomedical Reports
https://www.readbyqxmd.com/read/28394459/ergogenic-properties-of-metformin-in-simulated-high-altitude
#14
Rebecca L Scalzo, Hunter L Paris, Scott E Binns, Janelle L Davis, Joseph W Beals, Christopher L Melby, Gary J Luckasen, Matthew S Hickey, Benjamin F Miller, Karyn L Hamilton, Christopher Bell
Metformin augments glucose/glycogen regulation and may acutely promote fatigue resistance during high-intensity exercise. In hypobaric environments, such as high altitude, the important contribution of carbohydrates to physiological function is accentuated as glucose/glycogen dependence is increased. Because hypoxia/hypobaria decreases insulin sensitivity, replenishing skeletal muscle glycogen in high altitude becomes challenging and subsequent physical performance may be compromised. We hypothesized that in conditions where glycogen repletion was critical to physical outcomes, metformin would attenuate hypoxia-mediated decrements in exercise performance...
April 10, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28335458/in-vitro-antioxidant-activity-and-in-vivo-anti-fatigue-effect-of-sea-horse-hippocampus-peptides
#15
Zebin Guo, Duanquan Lin, Juanjuan Guo, Yi Zhang, Baodong Zheng
This study investigated changes the in vitro antioxidant activity of Hippocampus polypeptides during enzymatic hydrolysis, including the effects of enzyme species, enzyme concentration, material-liquid ratio, hydrolysis time, pH, and temperature of the reaction system. Its in vivo anti-fatigue activity was also studied. Hippocampus peptide prepared by papain digestion exhibited the highest 1,1-diphenyl-2-picryl-hydrazyl free radical scavenging rate (71.89% ± 1.50%) and strong hydroxyl radical scavenging rate (75...
March 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28165424/changbai-mountain-ginseng-panax-ginseng-c-a-mey-extract-supplementation-improves-exercise-performance-and-energy-utilization-and-decreases-fatigue-associated-parameters-in-mice
#16
Guo-Dong Ma, Chun-Hui Chiu, Yi-Ju Hsu, Chien-Wen Hou, Yi-Ming Chen, Chi-Chang Huang
Changbai Mountain Ginseng (CMG, Panax ginseng C.A. Mey) is a traditional medicine commonly found in Northeast China and grows at elevations of 2000 m or higher in the Changbai Mountain Range. CMG, considered to be a "buried treasure medicine", is priced higher than other types of ginseng. However, few studies have demonstrated the effects of CMG supplementation on exercise performance, physical fatigue, and the biochemical profile. The major compound of CMG extract was characterized by electrospray ionization tandem mass spectrometry (HPLC-ESI-MS/MS)...
February 5, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28106808/anti-fatigue-effects-of-the-unique-polysaccharide-marker-of-dendrobium-officinale-on-balb-c-mice
#17
Wei Wei, Zhi-Peng Li, Tong Zhu, Hau-Yee Fung, Tin-Long Wong, Xin Wen, Dik-Lung Ma, Chung-Hang Leung, Quan-Bin Han
Dendrobium officinale extract shows potent anti-fatigue effects; however, the active substance responsible for these effects remains undetermined. A glucomannan with a huge molecular size of 730 kDa, called DOP, was identified as the unique authentication marker of this expensive herb. DOP exhibited immunomodulating effects on macrophages and lymphocytes in our previous study. Clinical reports also showed that people with fatigue syndrome have a disturbed immune system. Because DOP is the unique and dominant component of D...
January 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27983751/muscle-glycogen-where-did-you-come-from-where-did-you-go
#18
George G Schweitzer, Monica L Kearney, Bettina Mittendorfer
No abstract text is available yet for this article.
May 1, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/27983571/anti-fatigue-effects-of-small-molecule-oligopeptides-isolated-from-panax-ginseng-c-a-meyer-in-mice
#19
Lei Bao, Xiaxia Cai, Junbo Wang, Yuan Zhang, Bin Sun, Yong Li
Panax ginseng C. A. Meyer (ginseng) is an edible and medicinal Chinese herb, which is often used in Asian countries for physical fitness. Ginseng is reported to have a wide range of biological activity and pharmaceutical properties. There were more studies on ginsenosides and polysaccharides, but fewer studies on ginseng oligopeptides (GOP), which are small molecule oligopeptides isolated from ginseng. The present study was designed to evaluate the anti-fatigue effects of GOP in mice and explore the possible underlying mechanism...
December 13, 2016: Nutrients
https://www.readbyqxmd.com/read/27983570/anti-fatigue-effect-by-peptide-fraction-from-protein-hydrolysate-of-croceine-croaker-pseudosciaena-crocea-swim-bladder-through-inhibiting-the-oxidative-reactions-including-dna-damage
#20
Yu-Qin Zhao, Li Zeng, Zui-Su Yang, Fang-Fang Huang, Guo-Fang Ding, Bin Wang
The swim bladder of the croceine croaker (Pseudosciaena crocea) was believed to have good curative effects in various diseases, including amnesia, insomnia, dizziness, anepithymia, and weakness after giving birth, in traditional Chinese medicine. However, there is no research focusing on the antioxidant and anti-fatigue peptides from croceine croaker swim bladders at present. Therefore, the purpose of this study was to investigate the bioactivities of peptide fractions from the protein hydrolysate of croceine croaker related to antioxidant and anti-fatigue effects...
December 13, 2016: Marine Drugs
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