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Endurance exercise

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https://www.readbyqxmd.com/read/28723843/no-superior-adaptations-to-carbohydrate-periodization-in-elite-endurance-athletes
#1
Kasper Degn Gejl, Line Thams, Mette Hansen, Torben Rokkedal-Lausch, Peter Plomgaard, Lars Nybo, Filip J Larsen, Daniele A Cardinale, Kurt Jensen, Hans-Christer Holmberg, Kristian Vissing, Niels Ørtenblad
PURPOSE: The present study investigated the effects of periodic CHO restriction on endurance performance and metabolic markers in elite endurance athletes. METHODS: Twenty-six male elite endurance athletes (VO2max: 65.0 ml O2[BULLET OPERATOR]kg[BULLET OPERATOR]min) completed 4 weeks of regular endurance training, while matched and randomized into two groups training with (Low) or without (High) carbohydrate (CHO) manipulation three days a week. The CHO manipulation days consisted of a 1-hr high intensity bike session in the morning, recovery for 7 hrs while consuming isocaloric diets containing either high CHO (414±2...
July 19, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28723842/reduced-neuromuscular-performance-in-amenorrheic-elite-endurance-athletes
#2
Åsa B Tornberg, Anna Melin, Fiona Manderson Koivula, Anders Johansson, Sven Skouby, Jens Faber, Anders Sjödin
INTRODUCTION: Secondary functional hypothalamic amenorrhea (SFHA) is common among female athletes, especially in weight-sensitive sports. The aim of this study was to investigate the link between SFHA and neuromuscular performance in elite endurance athletes. METHODS: Sixteen eumenorrheic (EUM) and 14 SFHA athletes from national teams and competitive clubs participated. Methods included gynecological examination; body composition (DXA);; resting metabolic rate and work efficiency; exercise capacity; knee muscular strength (KMS) and knee muscular endurance (KME); reaction time (RT); blood sampling performed on the 3rd-5th day of the menstrual cycle, and 7-day assessment of energy availability...
July 19, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28721439/effects-of-insulin-and-exercise-training-on-fgf21-its-receptors-and-target-genes-in-obesity-and-type-2-diabetes
#3
Rikke Kruse, Sara G Vienberg, Birgitte F Vind, Birgitte Andersen, Kurt Højlund
AIMS/HYPOTHESIS: Pharmacological doses of FGF21 improve glucose tolerance, lipid metabolism and energy expenditure in rodents. Induced expression and secretion of FGF21 from muscle may increase browning of white adipose tissue (WAT) in a myokine-like manner. Recent studies have reported that insulin and exercise increase FGF21 in plasma. Obesity and type 2 diabetes are potentially FGF21-resistant states, but to what extent FGF21 responses to insulin and exercise training are preserved, and whether FGF21, its receptors and target genes are altered, remains to be established...
July 18, 2017: Diabetologia
https://www.readbyqxmd.com/read/28719620/endurance-performance-and-energy-metabolism-during-exercise-in-mice-with-a-muscle-specific-defect-in-the-control-of-branched-chain-amino-acid-catabolism
#4
Minjun Xu, Yasuyuki Kitaura, Takuya Ishikawa, Yoshihiro Kadota, Chihaya Terai, Daichi Shindo, Takashi Morioka, Miki Ota, Yukako Morishita, Kengo Ishihara, Yoshiharu Shimomura
It is known that the catabolism of branched-chain amino acids (BCAAs) in skeletal muscle is suppressed under normal and sedentary conditions but is promoted by exercise. BCAA catabolism in muscle tissues is regulated by the branched-chain α-keto acid (BCKA) dehydrogenase complex, which is inactivated by phosphorylation by BCKA dehydrogenase kinase (BDK). In the present study, we used muscle-specific BDK deficient mice (BDK-mKO mice) to examine the effect of uncontrolled BCAA catabolism on endurance exercise performance and skeletal muscle energy metabolism...
2017: PloS One
https://www.readbyqxmd.com/read/28719492/fifty-men-3510-marathons-cardiac-risk-factors-and-coronary-artery-calcium-scores
#5
William O Roberts, Robert S Schwartz, Ross F Garberich, Samantha Carlson, Thomas Knickelbine, Jonathan G Schwartz, Gretchen Peichel, John R Lesser, Kelly Wickstrom, Kevin M Harris
INTRODUCTION/PURPOSE: Many male marathon runners have elevated coronary artery calcium (CAC) scores despite high physical activity. We examined the association between CAC scores, cardiovascular risk factors, and lifestyle habits in long term marathoners. METHODS: We recruited men who had run ≥1 marathon annually for 25 consecutive years. CAC was assessed using coronary computed tomography angiography. Atherosclerotic cardiovascular disease (CAD) risk factors were measured with a 12-lead ECG, serum lipid panel, height, weight, resting blood pressure and heart rate, and a risk factor questionnaire...
July 17, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28718320/oral-prednisolone-for-4-days-does-not-increase-exercise-tolerance-in-men-with-copd
#6
S L Karlsson, V Backer, Nina Skavlan Godtfredsen
One of the primary objectives in management of chronic obstructive pulmonary disease (COPD) is preventing decrease in lung function and reducing the annual number of acute exacerbations of COPD (AECOPD). An oral course of systemic corticosteroids is a commonly used treatment in AECOPD. We hypothesize that this treatment also increases exercise performance and decreases muscle fatigue. In a randomized double-blinded, parallel, placebo-controlled trial, we investigated 14 men (8 on prednisolone 37.5 mg vs. 6 on placebo) with severe and very severe COPD...
January 1, 2017: Chronic Respiratory Disease
https://www.readbyqxmd.com/read/28715596/influence-of-physical-exercise-on-%C3%AE-amyloid-%C3%AE-synuclein-and-tau-accumulation-an-in-vitro-model-of-oxidative-stress-in-human-red-blood-cells
#7
C Iofrida, S Daniele, D Pietrobono, J Fusi, F Galetta, M L Trincavelli, U Bonuccelli, F Franzoni, C Martini
A common pathological feature of neurodegenerative disorders (NDs), such as Alzheimer's (AD) and Parkinson's (PD) diseases, is the abnormal accumulation and misfolding of specific proteins, primarily α-synuclein (α-syn), β-amyloid1-42 (Aβ) and tau, in brain and in peripheral tissues too. Oxidative stress has been proved to be involved in NDs at various levels and, in particular, in such protein alterations, on the contrary physical activity is emerging as a counteracting factor in NDs. In the present work, the content of Aβ, α-syn and tau in red blood cells (RBCs) derived from ten endurance athletes (ATHL) and ten sedentary volunteers (SED) were compared before and after in vitrooxidative stress treatment...
July 1, 2017: Archives Italiennes de Biologie
https://www.readbyqxmd.com/read/28715594/physical-exercise-and-oxidative-stress-in-muscular-dystrophies-is-there-a-good-balance
#8
L Chico, G Ricci, M Cosci O Di Coscio, C Simoncini, G Siciliano
The effect of oxidative stress on muscle damage inducted by physical exercise is widely debated. It is generally agreed that endurance and intense exercise can increase oxidative stress and generate changes in antioxidant power inducing muscle damage; however, regular and moderate exercise can be beneficial for the health improving the antioxidant defense mechanisms in the majority of cases. Growing evidences suggest that an increased oxidative/nitrosative stress is involved in the pathogenesis of several muscular dystrophies (MDs)...
July 1, 2017: Archives Italiennes de Biologie
https://www.readbyqxmd.com/read/28713535/strength-training-with-repetitions-to-failure-does-not-provide-additional-strength-and-muscle-hypertrophy-gains-in-young-women
#9
Saulo Martorelli, Eduardo Lusa Cadore, Mikel Izquierdo, Rodrigo Celes, André Martorelli, Vitor Alonso Cleto, José Gustavo Alvarenga, Martim Bottaro
This study investigated the effects of a 10-week resistance training to failure on neuromuscular adaptations in young women. Eighty-nine active young women were randomly assigned to one of three groups: 1) repetitions to failure (RF; three sets of repetitions to failure); 2) repetitions not to failure with equalized volume (RNFV; four sets of 7 repetitions); and 3) repetitions not to failure (RNF; three sets of 7 repetitions). All groups performed the elbow flexor exercise (bilateral biceps curl) and trained 2 days per week using 70% of 1RM...
June 24, 2017: European Journal of Translational Myology
https://www.readbyqxmd.com/read/28713466/intra-subject-variability-of-5-km-time-trial-performance-completed-by-competitive-trained-runners
#10
James Fisher, Thomas Clark, Katherine Newman-Judd, Josh Arnold, James Steele
Time-trials represent an ecologically valid approach to assessment of endurance performance. Such information is useful in the application of testing protocols and estimation of sample sizes required for research/magnitude based inference methods. The present study aimed to investigate the intra-subject variability of 5 km time-trial running performance in trained runners. Six competitive trained male runners (age = 33.8 ± 10.1 years; stature = 1.78 ± 0.01 m; body mass = 69.0 ± 10.4 kg, [Formula: see text]O2max = 62...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28712260/effects-of-an-integrated-health-care-program-for-children
#11
Ok Hyun Kim, Jin Kyung Park
PURPOSE: This study examined the effects of an integrated health care program in elementary school students. METHODS: The integrated program comprised exercises (3-4 times/week) and six sessions on nutritional and psychological education. Anthropometric measurements were recorded before the intervention. Additionally, physical fitness, dietary habits, nutrition knowledge, and psychological changes were assessed before and after the program. RESULTS: In total, 29% of the subjects were overweight and obese before the intervention (32% boys and 26% girls)...
March 31, 2017: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/28706467/ketogenic-diet-benefits-body-composition-and-well-being-but-not-performance-in-a-pilot-case-study-of-new-zealand-endurance-athletes
#12
Caryn Zinn, Matthew Wood, Mikki Williden, Simon Chatterton, Ed Maunder
BACKGROUND: Low-carbohydrate, high-fat and ketogenic diets are increasingly adopted by athletes for body composition and sports performance enhancements. However, as yet, there is no consensus on their efficacy in improving performance. There is also no comprehensive literature on athletes' experiences while undertaking this diet. The purpose of this pilot work was two-fold: i. to examine the effects of a non-calorie controlled ketogenic diet on body composition and performance outcomes of endurance athletes, and ii...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28705431/-effect-of-intermittent-variable-intensity-exercise-on-qt-variation-and-risk-of-sudden-cardiac-death-among-cameroonian-school-adolescents
#13
E C Bika Lele, M N Pepouomi, A Temfemo, J Mekoulou, P Assomo Ndemba, S H Mandengue
INTRODUCTION: Several cases of sudden deaths are observed among students practicing sport and physical activity (SPA). Just few studies have been carried out on the variation of the QT (interval) and risk of sudden death during sporting exercises. AIM: To determine the effect of variable intermittent stress intensity on the variation of QT and the risk of sudden cardiac death. PATIENTS AND METHODS: Form 4, lower sixth and upper sixth students were recruited from a high school in Douala (Cameroon)...
July 10, 2017: Annales de Cardiologie et D'angéiologie
https://www.readbyqxmd.com/read/28704880/left-ventricular-adaptation-to-12-weeks-of-indoor-cycling-at-the-gym-in-untrained-females
#14
Kristofer Hedman, Niclas Bjarnegård, Toste Länne
Cross-sectional studies provide evidence of larger cardiac dimensions and mass in endurance trained than in untrained females. Much less is known regarding adaptations in cardiac function following training in untrained subjects. We aimed to study left ventricular (LV) adaptation to indoor cycling in previously untrained females, in regard of LV dimensions, mass and function. 42 sedentary females were divided into 2 equally sized groups, either training indoor cycling at regular classes at a local gym for 12 weeks, in average 2...
July 13, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28704507/regular-moist-snuff-dipping-does-not-affect-endurance-exercise-performance
#15
Frida Björkman, Fredrik Edin, C Mikael Mattsson, Filip Larsen, Björn Ekblom
Physiological and medical effects of snuff have previously been obtained either in cross-sectional studies or after snuff administration to non-tobacco users. The effects of snuff cessation after several years of daily use are unknown. 24 participants with >2 years of daily snuff-use were tested before and after >6 weeks snuff cessation (SCG). A control group (CO) of 11 snuff users kept their normal habits. Resting heart rate (HR) and blood pressure (BP) were significantly lower in SCG after snuff cessation, and body mass was increased by 1...
2017: PloS One
https://www.readbyqxmd.com/read/28702901/implications-of-impaired-endurance-peffects-of-endurance-training-orformance-following-single-bouts-of-resistance-training-an-alternate-concurrent-training-perspective
#16
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/28702049/endurance-exercise-ability-in-the-horse-a-trait-with-complex-polygenic-determinism
#17
Anne Ricard, Céline Robert, Christine Blouin, Fanny Baste, Gwendoline Torquet, Caroline Morgenthaler, Julie Rivière, Nuria Mach, Xavier Mata, Laurent Schibler, Eric Barrey
Endurance horses are able to run at more than 20 km/h for 160 km (in bouts of 30-40 km). This level of performance is based on intense aerobic metabolism, effective body heat dissipation and the ability to endure painful exercise. The known heritabilities of endurance performance and exercise-related physiological traits in Arabian horses suggest that adaptation to extreme endurance exercise is influenced by genetic factors. The objective of the present genome-wide association study (GWAS) was to identify single nucleotide polymorphisms (SNPs) related to endurance racing performance in 597 Arabian horses...
2017: Frontiers in Genetics
https://www.readbyqxmd.com/read/28701315/effect-of-endurance-training-and-branched-chain-amino-acids-on-the-signaling-for-muscle-protein-synthesis-in-ckd-model-rats-fed-a-low-protein-diet
#18
Takuya Yoshida, Sachika Kakizawa, Yuri Totsuka, Miho Sugimoto, Shinji Miura, Hiromichi Kumagai
A low-protein diet (LPD) protects against the progression of renal injury in patients with chronic kidney disease (CKD). However, LPD may accelerate muscle wasting in these patients. Both exercise and branched chain amino acids (BCAA) are known to increase muscle protein synthesis by activating the mammalian target of rapamycin (mTOR) pathway. The aim of this study is to investigate whether endurance exercise and BCAA play a role for increasing muscle protein synthesis in LPD-fed CKD (5/6 nephrectomized) rats...
July 12, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28698596/aerobic-fitness-associates-with-mnemonic-discrimination-as-a-mediator-of-physical-activity-effects-evidence-for-memory-flexibility-in-young-adults
#19
Kazuya Suwabe, Kazuki Hyodo, Kyeongho Byun, Genta Ochi, Takemune Fukuie, Takeshi Shimizu, Morimasa Kato, Michael A Yassa, Hideaki Soya
A physically active lifestyle has beneficial effects on hippocampal memory function. A potential mechanism for this effect is exercise-enhanced hippocampal plasticity, particularly in the dentate gyrus (DG). Within hippocampal memory formation, the DG plays a crucial role in pattern separation, which is the ability to discriminate among similar experiences. Computational models propose a theoretical hypothesis that enhanced DG-mediated pattern separation leads to "memory flexibility"-a selective improvement in the ability to overcome moderate levels of mnemonic interference...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28697553/impact-of-training-volume-and-intensity-on-rbc-nos-no-pathway-and-endurance-capacity
#20
Christina Koliamitra, Bastian Holtkamp, Philipp Zimmer, Wilhelm Bloch, Marijke Grau
BACKGROUND: Acute exercise increases red blood cell-nitric oxide synthase (RBC-NOS) activation and RBC deformability but the effect of regular training remains unclear. OBJECTIVE: To detect the chronic effect of enduring moderate and high intensity training on the RBC-NOS/NO pathway and to detect a relation between RBC deformability and endurance capacity. METHODS: 38 healthy male subjects were randomly assigned to one of three training groups: High Volume Training (HVT; 120-140 beats per minute (bpm)), High Intensity Training (HIT; 160-180 bpm) and Moderate Intensity Training (MIT; 140-160 bpm)...
July 3, 2017: Biorheology
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