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https://www.readbyqxmd.com/read/29777386/substrate-metabolism-during-ironman-triathlon-different-horses-on-the-same-courses
#1
Ed Maunder, Andrew E Kilding, Daniel J Plews
Ironman triathlons are ultra-endurance events of extreme duration. The performance level of those competing varies dramatically, with elite competitors finishing in ~ 8:00:00, and lower performing amateurs finishing in ~ 14-15:00:00. When applying appropriate values for swimming, cycling and running economies to these performance times, it is demonstrated that the absolute energy cost of these events is high, and the rate of energy expenditure increases in proportion with the athlete's competitive level...
May 18, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29776987/mini-dose-glucagon-as-a-novel-approach-to-prevent-exercise-induced-hypoglycemia-in-type-1-diabetes
#2
Michael R Rickels, Stephanie N DuBose, Elena Toschi, Roy W Beck, Alandra S Verdejo, Howard Wolpert, Martin J Cummins, Brett Newswanger, Michael C Riddell
OBJECTIVE: Patients with type 1 diabetes who do aerobic exercise often experience a drop in blood glucose concentration that can result in hypoglycemia. Current approaches to prevent exercise-induced hypoglycemia include reduction in insulin dose or ingestion of carbohydrates, but these strategies may still result in hypoglycemia or hyperglycemia. We sought to determine whether mini-dose glucagon (MDG) given subcutaneously before exercise could prevent subsequent glucose lowering, and to compare the glycemic response to current approaches for mitigating exercise-associated hypoglycemia...
May 18, 2018: Diabetes Care
https://www.readbyqxmd.com/read/29769827/effects-of-a-4-week-very-low-carbohydrate-diet-on-high-intensity-interval-training-responses
#3
Lukas Cipryan, Daniel J Plews, Alessandro Ferretti, Phil B Maffetone, Paul B Laursen
The purpose of the study was to examine the effects of altering from habitual mixed Western-based (HD) to a very low-carbohydrate high-fat (VLCHF) diet over a 4-week timecourse on performance and physiological responses during high-intensity interval training (HIIT). Eighteen moderately trained males (age 23.8 ± 2.1 years) consuming their HD (48 ± 13% carbohydrate, 17 ± 3% protein, 35 ± 9% fat) were assigned to 2 groups. One group was asked to remain on their HD, while the other was asked to switch to a non-standardized VLCHF diet (8 ± 3% carbohydrate, 29 ± 15% protein, 63 ± 13% fat) for 4 weeks...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29757056/whey-protein-augments-leucinemia-and-post-exercise-p70s6k1-activity-compared-to-a-hydrolysed-collagen-blend-when-in-recovery-from-training-with-low-carbohydrate-availability
#4
Samuel G Impey, Kelly M Hammond, Robert Naughton, Carl Langan-Evans, Sam O Shepherd, Adam P Sharples, Jessica Cegielski, Kenneth Smith, Stewart Jeromson, D Lee Hamilton, Graeme L Close, James P Morton
We examined the effects of whey versus collagen protein on skeletal muscle cell signalling responses associated with mitochondrial biogenesis and protein synthesis in recovery from an acute training session completed with low carbohydrate (CHO) availability. In a repeated measures design (after adhering to a 36-h exercise-dietary intervention to standardise pre-exercise muscle glycogen), eight males completed a 75-min non-exhaustive cycling protocol and consumed 22 g of a hydrolysed collagen blend (COLLAGEN) or whey (WHEY) protein 45 min prior to exercise, 22 g during exercise and 22 g immediately post-exercise...
May 14, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29757053/applying-a-low-fodmap-dietary-intervention-to-a-female-ultra-endurance-runner-with-irritable-bowel-syndrome-during-a-multi-stage-ultra-marathon
#5
Stephanie K Gaskell, Ricardo J S Costa
Malabsorption of Fermentable Oligo- Di- and Mono-saccharides and Polyols (FODMAPs) in response to prolonged exercise may increase incidence of upper- and lower-gastrointestinal symptoms (GIS), which are known to impair exercise performance. The case-study aimed to explore the impact of a low-FODMAP diet on exercise-associated GIS in a female ultra-endurance runner diagnosed with irritable bowel syndrome (IBS), competing in a six-day 186.7 km mountainous multi-stage ultra-marathon (MSUM). IBS symptom severity score at diagnosis was 410 and following a low-FODMAP diet (3...
May 14, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29746639/branched-chain-amino-acids-are-the-primary-limiting-amino-acids-in-the-diets-of-endurance-trained-men-after-a-bout-of-prolonged-exercise
#6
Hiroyuki Kato, Katsuya Suzuki, Makoto Bannai, Daniel R Moore
Background: The indicator amino acid oxidation (IAAO) method estimates the protein intake required to maximize whole-body protein synthesis and identify the daily protein requirement in a variety of populations. However, it is unclear whether the greater requirements for endurance athletes previously determined by the IAAO reflect an increased demand for all or only some amino acids. Objective: The aim of this study was to determine the primary rate-limiting amino acids in endurance-trained athletes after prolonged exercise, by measuring the oxidation of ingested [1-13C]phenylalanine in response to variable amino acid intake...
May 9, 2018: Journal of Nutrition
https://www.readbyqxmd.com/read/29743883/treatment-of-diabetic-mice-with-a-combination-of-ketogenic-diet-and-aerobic-exercise-via-modulations-of-ppars-gene-programs
#7
Qiang Zhang, Lingyan Xu, Jie Xia, Dongmei Wang, Min Qian, Shuzhe Ding
Type 2 diabetes is a prevalent chronic disease arising as a serious public health problem worldwide. Diet intervention is considered to be a critical strategy in glycemic control of diabetic patients. Recently, the low-carbohydrate ketogenic diet is shown to be effective in glycemic control and weight loss. However, hepatic lipid accumulation could be observed in mice treated with ketogenic diet. On the other hand, exercise is a well-known approach for treating nonalcoholic fatty liver disease. We thus hypothesize that the combination of ketogenic diet and exercise could improve insulin sensitivity, while minimizing adverse effect of hepatic steatosis...
2018: PPAR Research
https://www.readbyqxmd.com/read/29740221/effect-of-sitagliptin-on-hepatic-histological-activity-and-fibrosis-of-nonalcoholic-steatohepatitis-patients-a-1-year-randomized-control-trial
#8
Shahinul Alam, Jhumur Ghosh, Golam Mustafa, Mohammad Kamal, Nooruddin Ahmad
Background/purpose: Dipeptidyl peptidase 4 (DPP-4) expression is directly associated with hepatic lipogenesis and liver injury in nonalcoholic steatohepatitis (NASH). This study has been designed to elucidate the histological improvement of NASH with the DPP-4 inhibitor sitagliptin. Materials and methods: In this open-label randomized control trial, paired liver biopsy was taken from 40 NASH patients. Sitagliptin 100 mg was given once daily to the SL group and no sitagliptin was given to the L group for 1 year...
2018: Hepatic Medicine: Evidence and Research
https://www.readbyqxmd.com/read/29695963/the-effects-of-ppar-stimulation-on-cardiac-metabolic-pathways-in-barth-syndrome-mice
#9
Caitlin Schafer, Vicky Moore, Nupur Dasgupta, Sabzali Javadov, Jeanne F James, Alexander I Glukhov, Arnold W Strauss, Zaza Khuchua
Aim: Tafazzin knockdown (TazKD) in mice is widely used to create an experimental model of Barth syndrome (BTHS) that exhibits dilated cardiomyopathy and impaired exercise capacity. Peroxisome proliferator-activated receptors (PPARs) are a group of nuclear receptor proteins that play essential roles as transcription factors in the regulation of carbohydrate, lipid, and protein metabolism. We hypothesized that the activation of PPAR signaling with PPAR agonist bezafibrate (BF) may ameliorate impaired cardiac and skeletal muscle function in TazKD mice...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29687558/a-single-exercise-session-increases-insulin-sensitivity-in-normal-weight-and-overweight-obese-adolescents
#10
Kevin R Short, Lauren V Pratt, April M Teague
We measured the effect of an aerobic exercise session on postprandial glucose control in adolescents with habitually low-physical activity. The goal was to determine if the acute or residual response of exercise was altered in people who are overweight/obese (OW/Ob). Eleven normal weight, body mass index (NW, BMI = 48 ± 13 percentile) and 12 OW/Ob (BMI = 91 ± 5 percentile) participants completed 3 trials. In the no exercise (No Ex) trial, participants rested quietly before and after consuming a test meal...
April 23, 2018: Pediatric Diabetes
https://www.readbyqxmd.com/read/29681197/effect-of-carbohydrate-electrolyte-consumption-on-insulin-cortisol-hormones-and-blood-glucose-after-high-intensity-exercise
#11
Ahmet Mor, Yildirim Kayacan, Gokhan Ipekoglu, Erkal Arslanoglu
OBJECTIVE: This study aimed to examine the effect of CHO-E consumption after high-intensity exercise on insulin, cortisol hormones and blood glucose responses, which is important for performance and recovery in athletes. METHODS: Sixteen volunteers, male athletes, participated into this study. Athletes were divided into two groups as experiment (CHO-E) and placebo (PLA). Blood was taken from the athletes three times as basal, post-exercise (PE) and 2 h after ingestion of supplement (PS)...
April 21, 2018: Archives of Physiology and Biochemistry
https://www.readbyqxmd.com/read/29681164/effect-of-diet-with-carbohydrate-but-without-daily-energy-restriction-on-serum-glucose-lactate-and-selected-mineral-and-lipid-levels-in-streptozotocin-induced-experimental-diabetic-rats
#12
Osman Sinan Ozsezen, Ismail Meral
OBJECTIVE: Type I diabetes is a disease characterised by an extreme reduction in serum insulin levels. Diet and exercise have gained considerable attention in the treatment of diabetes. Therefore, this study was carried out to investigate the effect of diet with carbohydrate but without daily energy restriction on various metabolites (glucose, triglycerides, cholesterol, lactate), some electrolytes (Ca, Mg, Na, K, P, Cl) and essential metals (Mn, Co, Cu, Se, Zn, Fe) in the blood of rats with streptozotocin-induced diabetes...
April 21, 2018: Archives of Physiology and Biochemistry
https://www.readbyqxmd.com/read/29679309/effect-of-downhill-walking-on-next-day-muscle-damage-and-glucose-metabolism-in-healthy-young-subjects
#13
Airi Nakayama, Wataru Aoi, Maki Takami, Nariyuki Hirano, Yumi Ogaya, Sayori Wada, Akane Higashi
This study aimed to investigate the effect of downhill walking on muscle damage and glucose metabolism in healthy subjects. All ten healthy young men and women (age, 24.0 ± 1.4 years) performed rest, uphill walking, and downhill walking trials. In the exercise trials, uphill (+ 5%) or downhill (- 5%) treadmill walking was performed at 6 km/h for 30 min. On the next day, muscle soreness was significantly higher in the downhill trial than in the uphill trial (P < 0.01). Respiratory metabolic performance did not differ between trials...
April 20, 2018: Journal of Physiological Sciences: JPS
https://www.readbyqxmd.com/read/29673243/the-effect-of-additional-carbohydrate-supplements-for-7-days-after-prolonged-interval-exercise-on-exercise-performance-and-energy-metabolism-during-submaximal-exercise-in-team-sports-athletes
#14
Hun-Young Park, Jisu Kim, Miyoung Park, Nana Chung, Kiwon Lim
PURPOSE: The purpose of our study was to determine the effectiveness of carbohydrate loading by additional carbohydrate supplements for 7 days after prolonged interval exercise on exercise performance and energy metabolism during submaximal exercise in team-sports athletes. METHODS: Twenty male team-sports athletes (14 soccer and 6 rugby players) volunteered to participate in the study and were equally divided into the experimental group (EXP, n=10) performing additional carbohydrate supplementation for 7 days after prolonged interval exercise until blood glucose level reaches 50 mg/dL or less and the control group (CON, n=10)...
March 30, 2018: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/29672225/probiotic-supplementation-in-trained-trotter-horses-effect-on-blood-clinical-pathology-data-and-urine-metabolomic-assessed-in-field
#15
Luca Laghi, Chenglin Zhu, Giuseppe Campagna, Giacomo Rossi, Marilena Bazzano, Fulvio Laus
The attention of sports community towards probiotic supplementation as a way to promote exercise and training performance, together with good health, has increased in recent years. This has applied also to horses, with promising results. Here, for the first time, we tested a probiotic mix of several strains of alive bacteria typically employed for humans to improve the training performance of Standardbred horses in athletic activity. To evaluate its effects on the horse performance, we measured lactate concentration in blood, a translational outcome largely employed for the purpose, combined with the study of hematological and biochemical parameters, together with urine from a metabolomics perspective...
April 19, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29665358/hyperinsulinemic-euglycemic-clamp-over-the-first-year-of-use-of-depot-medroxyprogesterone-acetate-as-a-contraceptive
#16
Vaneska Melhado-Kimura, Gisele Almeida Batista, Aglécio Luiz de Souza, Priscilla de Nazaré Silva Dos Santos, Sarah Monte Alegre, Elizabeth João Pavin, Luis Bahamondes, Arlete Fernandes
OBJECTIVE: The literature lacks data on the use of the gold-standard hyperinsulinemic-euglycemic clamp (HEC) technique for the evaluation of insulin resistance (IR) in depot-medroxyprogesterone acetate (DMPA) users. This study assessed carbohydrate metabolism in non-obese users of DMPA using the HEC technique. STUDY DESIGN: A prospective, non-randomized, comparative study conducted at the Family Planning Clinic/Metabolic Unit, University of Campinas, Brazil. Forty-eight women aged 18-39 years underwent HEC: 30 initiating use of DMPA and 18 initiating use of a copper intrauterine device (IUD)...
April 14, 2018: Contraception
https://www.readbyqxmd.com/read/29663436/early-effects-of-empagliflozin-on-exercise-tolerance-in-patients-with-heart-failure-a-pilot-study
#17
Julio Núñez, Patricia Palau, Eloy Domínguez, Anna Mollar, Eduardo Núñez, Jose María Ramón, Gema Miñana, Enrique Santas, Lorenzo Fácila, Jose Luis Górriz, Juan Sanchis, Antoni Bayés-Genís
BACKGROUND: Sodium-glucose linked transporter 2 inhibition recently emerged as a promising therapy for reducing the risk of heart failure (HF) in patients with type 2 diabetes mellitus (T2DM). However, there is a lack of data endorsing its role in symptomatic HF patients. We sought to evaluate the short-term effects of empagliflozin on maximal exercise capacity in these patients. HYPOTHESIS: We postulate tretament with empagliflozin may improve functional capacity in patients with T2DM and established HF...
April 17, 2018: Clinical Cardiology
https://www.readbyqxmd.com/read/29626373/sex-dimorphism-of-substrate-utilization-differences-in-skeletal-muscle-mitochondrial-volume-density-and-function
#18
David Montero, Klavs Madsen, Anne-Kristine Meinild-Lundby, Fredrik Edin, Carsten Lundby
Fat oxidation during exercise is higher in females than males. We sought to determine whether sex differences in substrate metabolism are paralleled by distinct skeletal muscle mitochondrial volume density and oxidative capacity. Whole-body substrate (fat, carbohydrate (CHO)) utilization during submaximal treadmill running was assessed and skeletal muscle biopsies were taken to determine mitochondrial volume density (MitoVD ) and function in healthy young females (n = 12) and males (n = 12) matched by aerobic exercise capacity (VO2max ) and exercise performance...
April 6, 2018: Experimental Physiology
https://www.readbyqxmd.com/read/29619799/low-carbohydrate-ketogenic-diet-impairs-anaerobic-exercise-performance-in-exercise-trained-women-and-men-a-randomized-sequence-crossover-trial
#19
Kymberly A Wroble, Morgan N Trott, George G Schweitzer, Rabia S Rahman, Patrick V Kelly, Edward P Weiss
BACKGROUND: Low-carbohydrate, ketogenic diets cause mild, sub-clinical systemic acidosis. Anaerobic exercise performance is limited by acidosis. Therefore, we evaluated the hypothesis that a low-carbohydrate, ketogenic diet impairs anaerobic exercise performance, as compared to a high-carbohydrate diet. METHODS: Sixteen men and women (BMI, 23±1 kg/m2, age 23±1 yr) participated in a randomized-sequence, counterbalanced crossover study in which they underwent exercise testing after four days of either a low-carbohydrate, ketogenic diet (LC; <50 g/day and <10% of energy from carbohydrates) or a high-carbohydrate diet (HC; 6-10 g/kg/day carbohydrate)...
April 4, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29619796/overnight-fasting-compromises-exercise-intensity-and-volume-during-sprint-interval-training-but-improves-high-intensity-aerobic-endurance
#20
Tasuku Terada, Saeed R Toghi Eshghi, Yilina Liubaoerjijin, Michael Kennedy, Etienne Myette-Côté, Kevin Fletcher, Normand G Boulé
BACKGROUND: The combined effects of sprint interval training (SIT) and exercising in the fasted state are unknown. We compared the effects of SIT with exogenous carbohydrate supplementation (SITCHO) and SIT following overnight fast (SITFast) on aerobic capacity (peak oxygen consumption: V̇ O2peak) and high-intensity aerobic endurance (time-to-exhaustion at 85% V̇ O2peak [T85%]). METHODS: Twenty male cyclists were randomized to SITCHO and SITFast. Both groups performed 30-second all-out cycling followed by 4-minute active recovery 3 times per week for 4 weeks, with the number of sprint bouts progressing from 4 to 7...
April 4, 2018: Journal of Sports Medicine and Physical Fitness
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