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https://www.readbyqxmd.com/read/29050040/maximal-fat-oxidation-is-related-to-performance-in-an-ironman-triathlon
#1
Jacob Frandsen, Stine Dahl Vest, Steen Larsen, Flemming Dela, Jørn W Helge
The aim of the present study was to investigate the relationship between maximal fat oxidation rate (MFO) measured during a progressive exercise test on a cycle ergometer and ultra-endurance performance. 61 male ironman athletes (age: 35±1 yrs. [23-47 yrs.], with a BMI of 23.6±0.3 kg/m(2) [20.0-30.1 kg/m(2)], a body fat percentage of 16.7±0.7% [8.4-30.7%] and a VO2peak of 58.7±0.7 ml/min/kg [43.9-72.5 ml/min/kg] SEM [Range]) were tested in the laboratory between 25 and 4 days prior to the ultra-endurance event, 2016 Ironman Copenhagen...
October 19, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29035607/accuracy-of-w-recovery-kinetics-in-high-performance-cyclists-modelling-intermittent-work-capacity
#2
Jason C Bartram, Dominic Thewlis, David T Martin, Kevin I Norton
PURPOSE: With knowledge of an individual's critical power (CP) and W' the SKIBA 2 model provides a framework with which to track W' balance during intermittent high intensity work bouts. There are fears the time constant controlling the recovery rate of W' (τW') may require refinement to enable effective use in an elite population. METHODS: Four elite endurance cyclists completed an array of intermittent exercise protocols to volitional exhaustion. Each protocol lasted approximately 3...
October 16, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29031332/right-ventricular-function-during-pharmacological-and-exercise-stress-testing-in-horses
#3
A Decloedt, D De Clercq, S Ven, L Vera, G van Loon
The disproportionate rise of pulmonary artery pressure compared to systemic blood pressure during exercise can lead to detrimental right ventricular remodelling in endurance athletes. Horses may act as an extreme model of these athletic cardiovascular adaptations, as they show a three fold increase in pulmonary pressures during exercise. Right ventricular function was examined in ten healthy horses using post-exercise and pharmacological stress echocardiography in a randomised cross-over design. Exercise testing was performed on a treadmill while pharmacological testing was performed using an atropine-dobutamine infusion...
September 2017: Veterinary Journal
https://www.readbyqxmd.com/read/29024137/do-male-athletes-with-already-high-initial-hemoglobin-mass-benefit-from-live-high-train-low-altitude-training
#4
Anna Hauser, Severin Troesch, Thomas Steiner, Franck Brocherie, Olivier Girard, Jonas J Saugy, Laurent Schmitt, Grégoire P Millet, Jon P Wehrlin
It has been proposed that athletes with high initial values of hemoglobin mass (Hbmass ) will have a lower Hbmass increase in response to 'live high-train low' (LHTL) altitude training. To verify this assumption, the relationship between initial absolute and relative Hbmass values and their respective Hbmass increase following LHTL in male endurance and team-sport athletes was investigated. Overall, 58 male athletes (35 well-trained endurance athletes and 23 elite male field hockey players) undertook an LHTL training camp with similar hypoxic doses (200-230 h)...
October 11, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29022255/acute-and-chronic-response-to-exercise-in-athletes-the-supernormal-heart
#5
Antonello D'Andrea, Tiziana Formisano, Lucia Riegler, Raffaella Scarafile, Raffaella America, Francesca Martone, Marco di Maio, Maria Giovanna Russo, Eduardo Bossone, Maurizio Galderisi, Raffaele Calabrò
During last decades, most studies have examined the exercise-induced remodeling defined as "athlete's heart". During exercise, there is an increased cardiac output that causes morphological, functional, and electrical modification of the cardiac chambers. The cardiac remodeling depends also on the type of training, age, sex, ethnicity, genetic factors, and body size. The two main categories of exercise, endurance and strength, determine different effects on the cardiac remodeling. Even if most sport comprise both strength and endurance exercise, determining different scenarios of cardiac adaptation to the exercise...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29021910/the-training-type-influence-on-male-elite-athletes-ventilatory-function
#6
Tijana Durmic, Biljana Lazovic Popovic, Mirjana Zlatkovic Svenda, Marina Djelic, Vladimir Zugic, Tamara Gavrilovic, Zoran Mihailovic, Marija Zdravkovic, Roman Leischik
BACKGROUND/AIM: To assess and compare measured ventilatory volumes (forced expiratory volume in 1 s (FEV1), peak expirium flow (PEF) and maximal voluntary ventilation (MVV)), ventilatory function capacities (forced vital capacity (FVC) and vital capacity (VC)) and FEV1/VC ratio in a sample of power and endurance elite athletes and their age-matched and sex-matched sedentary control group. METHODS: A cross-sectional study was applied on male elite athletes (n=470) who were classified according to the type of the predominantly performed exercise in the following way: group 1: endurance group (EG=270), group 2: power athletes group (SG=200) and group 3: sedentary control group (CG=100)...
2017: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/29018362/effects-of-unloaded-vs-loaded-plyometrics-on-speed-and-power-performance-of-elite-young-soccer-players
#7
Ronaldo Kobal, Lucas A Pereira, Vinicius Zanetti, Rodrigo Ramirez-Campillo, Irineu Loturco
The purpose of this study was to investigate the effects of loaded and unloaded plyometric training strategies on speed and power performance of elite young soccer players. Twenty-three under-17 male soccer players (age: 15.9 ± 1.2 years, height: 178.3 ± 8.1 cm, body-mass (BM): 68.1 ± 9.3 kg) from the same club took part in this study. The athletes were pair-matched in two training groups: loaded vertical and horizontal jumps using an haltere type handheld with a load of 8% of the athletes' body mass (LJ; n = 12) and unloaded vertical and horizontal plyometrics (UJ; n = 11)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29018359/that-escalated-quickly-planning-to-ignore-rpe-can-backfire
#8
Maik Bieleke, Wanja Wolff
Ratings of perceived exertion (RPE) are routinely assessed in exercise science and RPE is substantially associated with physiological criterion measures. According to the psychobiological model of endurance, RPE is a central limiting factor in performance. While RPE is known to be affected by psychological manipulations, it remains to be examined whether RPE can be self-regulated during static muscular endurance exercises to enhance performance. In this experiment, we investigate the effectiveness of the widely used and recommended self-regulation strategy of if-then planning (i...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29016220/considerations-for-fueling-an-endurance-athlete-with-home-parenteral-nutrition
#9
Emma M Tillman, Marianne Opilla
The goal of clinicians managing nutrition support for patients with home parenteral nutrition (HPN) is to adapt nutrition needs to best serve the consumers, so they may have the best quality of life despite specialized nutrition needs. Some HPN consumers may desire to participate in endurance athletics, which will require special considerations. This review is intended to outline key nutrition differences in endurance athletes that a nutrition support team should consider when providing HPN.
October 1, 2017: Nutrition in Clinical Practice
https://www.readbyqxmd.com/read/28991044/mountain-cycling-ultramarathon-impacts-in-inflammatory-and-hemoglobin-responses
#10
Isanete Alonso, Andreia Matos, Ricardo Ribeiro, Ângela Gil, Carlos Cardoso, Luís B Sardinha, Manuel Bicho
PURPOSE: To analyze the cumulative physiological burden of repetitive, strenuous exercise held during mountain cycling ultramarathon on regulatory mechanisms of hemoglobin degradation. METHODS: Fifty-five non-professional athletes (mean age 44.8±7.1 years old) participating in a 9-consecutive-day mountain cycling ultramarathon (TransPortugal), underwent anthropometric, hematological and biochemical assessments before and immediately after the race. Participants were further stratified as completers (9 courses) or non-completers, and divided according to the time they took to complete the race...
October 3, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28990148/athletes-and-the-aorta-normal-adaptations-and-the-diagnosis-and-management-of-pathology
#11
REVIEW
J Stephen Hedley, Dermot Phelan
Over a hundred years ago, physicians first recognized that participation in regular, vigorous training resulted in enlargement of the heart. Since that time, the term "athlete's heart" has entered the medical lexicon as a global expression encompassing the electrical, functional, and morphological adaptations that develop in response to physical training. Exercise-induced adaptations of the aorta, which is also exposed to large hemodynamic stresses during prolonged endurance exercise or resistance training, are less well recognized...
October 9, 2017: Current Treatment Options in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28983252/evaluation-of-muscle-microrna-expression-in-relation-to-human-peripheral-insulin-sensitivity-a-cross-sectional-study-in-metabolically-distinct-subject-groups
#12
Dennis Dahlmans, Alexandre Houzelle, Johanna A Jörgensen, Esther Phielix, Lucas Lindeboom, Matthijs K C Hesselink, Patrick Schrauwen, Joris Hoeks
In recent years, several microRNAs (miRNAs)-post-transcriptional regulators of gene expression-have been linked to the regulation of peripheral insulin sensitivity. Many of these studies, however, have been conducted in cell or animal models and the few human studies available lack adequate measurements of peripheral insulin sensitivity. In the present study, we examined the expression of 25 miRNAs, putatively involved in (peripheral) insulin sensitivity, in skeletal muscle biopsies from extensively phenotyped human individuals, widely ranging in insulin sensitivity...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28980321/post-exercise-recovery-of-contractile-function-and-endurance-in-humans-and-mice-is-accelerated-by-heating-and-slowed-by-cooling-skeletal-muscle
#13
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
https://www.readbyqxmd.com/read/28978544/intramuscular-triglyceride-synthesis-importance-in-partitioning-muscle-lipids-in-humans
#14
Bryan C Bergman, Leigh Perreault, Allison Strauss, Samantha D Bacon, Anna A Kerege, Kathleen Harrison, Joseph T Brozinick, Devon M Hunerdosse, Mary C Playdon, William Holmes, Hai Hoang Bui, Phil Sanders, Parker Siddall, Tao Wei, Melissa K Thomas, Ming Shang Kuo, Robert H Eckel
Intramuscular triglyceride (IMTG) concentration is elevated in insulin resistant individuals, and was once thought to promote insulin resistance. However, endurance trained athletes have equivalent concentration of IMTG compared to individuals with type 2 diabetes, and have very low risk of diabetes, termed the "athlete's paradox". We now know that IMTG synthesis is positively related to insulin sensitivity, but the exact mechanisms for this are unclear. To understand the relationship between IMTG synthesis and insulin sensitivity, we measured IMTG synthesis in obese control subjects, endurance trained athletes, and individuals with type 2 diabetes during rest, exercise, and recovery...
October 3, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28975667/development-of-a-nutrition-knowledge-questionnaire-for-young-endurance-athletes-and-their-coaches
#15
Maria Heikkilä, Raisa Valve, Mikko Lehtovirta, Mikael Fogelholm
Both athletes and coaches should have adequate nutrition knowledge in order to understand the importance of diet on athletic performance, recovery and health. Nutrition knowledge can be assessed reliably only by validated knowledge questionnaires. The aim of the present study was to develop a reliable and valid questionnaire for assessing the nutrition knowledge of young endurance athletes and their coaches. The questionnaire was developed with an expert panel and pilot tested by athletes, coaches and students...
October 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28971285/the-role-of-anabolic-androgenic-steroids-in-disruption-of-the-physiological-function-in-discrete-areas-of-the-central-nervous-system
#16
REVIEW
Giuseppe Bertozzi, Francesco Sessa, Giuseppe Davide Albano, Gabriele Sani, Francesca Maglietta, Mohsin H K Roshan, Giovanni Li Volti, Renato Bernardini, Roberto Avola, Cristoforo Pomara, Monica Salerno
Anabolic-androgenic steroids (AAS) abuse is often associated with a wide spectrum of adverse effects. These drugs are frequently abused by adolescents and athletes for esthetic purposes, as well as for improvement of their endurance and performances. In this literature review, we evaluated the correlation between AAS and anxiety or aggression. Two pathways are thought to be involved in AAS-induced behavioral disorders. Direct pathway via the amygdalo-fugal pathway, which connects the central nucleus of the amygdala to the brainstem, is involved in cognitive-emotive and homeostatic processes...
October 2, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28968288/specific-physical-training-in-elite-male-team-handball
#17
Herbert Wagner, Manuel Gierlinger, Nermin Adzamija, Samuel Ajayi, David W Bacharach, Serge P von Duvillard
Specific physical training in elite team handball is essential for optimal player's performance; however, scientific knowledge is generally based on temporary training studies with sub-elite athletes. Therefore, the aim of the study was to analyze the effects of specific physical training in an elite male handball team over the entire season.Twelve players of a male handball team from the First Austrian Handball League performed a one year specific physical training program in addition to their normal (team handball techniques and tactics) weekly training...
June 30, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28958144/assessment-of-pn-gal-as-a-marker-of-renal-function-in-elite-cyclists-during-professional-competitions
#18
A Andreazzoli, C Fossati, A Spaccamiglio, R Salvo, F Quaranta, C Minganti, L Di Luigi, P Borrione
Glomerular filtration rate (GFR) has been shown to be lower than physiological values during exercise with a strong negative correlation with exercise intensity. Among new markers of renal function, neutrophil gelatinase-associated lipocalin (NGAL) seems to be very promising. It is an early, sensitive and specific marker of acute kidney injury (AKI) with two isoforms: plasma NGAL (pNGAL) and urinary NGAL (uNGAL). The aim of the present study was to assess acute variations in NGAL plasma levels after performing high endurance physical exercise in a group of professional cyclists during the two major European professional cycling competitions (Giro D’Italia and Tour de France)...
July 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28955243/the-effect-of-a-100-km-ultra-marathon-under-freezing-conditions-on-selected-immunological-and-hematological-parameters
#19
Alena Žákovská, Beat Knechtle, Daniela Chlíbková, Marie Miličková, Thomas Rosemann, Pantelis T Nikolaidis
Although moderate exercise is beneficial for the human body and its immune system, exhaustive ultra-endurance performance in cold conditions might be harmful. The aim of this study was to examine the effect of a 100-km ultra-marathon under cold conditions (temperatures from -1°C to +1°C) on selected immunological, biochemical and hematological parameters. Participants were 15 runners (12 men and three women, age 40.3 ± 9.7 years, body mass 67.3 ± 9.0 kg and body height 1.74 ± 0.10 m, mean ± standard deviation)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28948538/the-right-heart-acute-and-chronic-issues
#20
REVIEW
Timothy W Churchill, Aaron L Baggish
Cardiovascular remodeling in response to sustained moderate and high-intensity exercise is a well-established phenomenon. Following more than a century of work focused on the left ventricle (LV), remodeling of the right side of the heart has recently become a topic of considerable scientific and clinical interest. Morphologic and functional changes have now been well documented in the right ventricle (RV) after isolated bouts of endurance exercise and in association with long-term sustained training. Although exercise-induced cardiac remodeling is classically viewed as an adaptive, clinically benign process, it has recently been hypothesized that repetitive bouts of intense exercise may trigger pathologic changes in the RV characterized by patchy fibrosis and a predisposition to arrhythmia...
September 25, 2017: Current Treatment Options in Cardiovascular Medicine
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